Altera

EPF10K20RI240-4 - FLEX 10K FPGA, 20K Gates, 240-Pin RQFP | Altera

MPN: EPF10K20RI240-4 ✗ End of Life
In Stock Ships in 1-3 business days
5 V Vdss 240-BFQFP / 240-RQFP with exposed pad Package 125 MHz Speed SRAM (volatile, external config device required) Memory
From $18.75 USD / Unit
MOQ: 1 |
Price updated: 2026-09-11
Volume Pricing
Qty Unit Price Extended
1 $38.5 $38.50
10 $34.2 $342.00
100 $28.9 $2,890.00
500 $22.5 $11,250.00
1,000 $18.75 $18,750.00
ℹ️ All prices are in USD

EPF10K20RI240-4 Overview

The Altera (Intel) EPF10K20RI240-4 is a member of the FLEX 10K family of SRAM-based Field-Programmable Gate Arrays (FPGAs) fabricated on a 0.42 µm CMOS process, delivering approximately 20,000 usable gates organized into 1,152 logic cells and 144 logic array blocks (LABs) with 12,288 RAM bits. It is offered in a 240-pin RQFP (Power/QFP Quad Flat Pack) package with exposed pad, providing 189 user I/O pins, a maximum internal operating frequency of 125 MHz, and 5 V core / I/O supply.

An FPGA (Field-Programmable Gate Array) is a semiconductor device built around an array of configurable logic blocks (CLBs), programmable interconnects, and I/O cells that the designer can re-program after manufacture to implement arbitrary digital logic. FPGAs sit hierarchically between CPLDs and ASICs/SoCs, and the FLEX 10K family was Altera's first family to embed dedicated array blocks (EABs) for on-chip synchronous RAM and ROM, advancing the architecture beyond simple glue-logic replacement.

Key features include in-system reconfigurability via SRAM configuration memory, support for 5 V PCI compliance, JTAG boundary-scan (IEEE 1149.1) for board test, built-in EAB blocks for 2 Kbit RAM/ROM each, and tri-state buffer on every I/O pin. The 240-pin RQFP footprint offers generous PCB escape routing and is widely supported by legacy design tools including Altera MAX+PLUS II and Quartus (legacy versions).

The FLEX 10K architecture combines a fine-grained logic fabric with coarse-grained embedded array blocks (EABs), giving designers both efficient random logic and high-density memory in a single die. Look-up tables (LUTs) implement the combinational logic, while the EABs provide synchronous memory with user-configurable width/depth, useful for FIFOs, ROM lookups, and DSP coefficient storage.

Typical applications include industrial control logic, telecommunications glue logic, glue logic for legacy 5 V microcontroller systems, PCI bus interface controllers, and prototyping of larger ASIC designs. The 5 V tolerance also makes it suitable for replacing older TTL/CMOS discrete logic in modernization programs.

When designing with this part, observe the 5 V supply rail and provide a clean decoupling network of 0.1 µF and 10 µF capacitors near every VCC/VCCIO pin pair. Configuration via the dedicated serial or parallel EPROM interface must be respected; modern MAX 10 or Cyclone devices are recommended for new designs, but the EPF10K20RI240-4 remains a drop-in solution for maintaining existing production.

This page synthesizes distributor pricing, same-package drop-in FLEX 10K alternatives, and practical design notes not aggregated on any single manufacturer or distributor page.

Drop-in alternatives for EPF10K20RI240-4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Variants in this series

Same-series models that are drop-in compatible with EPF10K20RI240-4 (same form factor and footprint) — differing in Process Technology, RoHS Status, Family, Series, Package.

Intel
Process Technology: 0.42 µm CMOS, 5 metal layers
RoHS Status: unknown (legacy Altera part, likely non-RoHS)
Series: FLEX-10K®
Compare with EPF10K20RI240-4 →
Altera
Family: Embedded Programmable Logic Device (EPLD)
Series: FLEX 10K
Compare with EPF10K20RI240-4 →
Intel
Process Technology: 0.42 µm CMOS
RoHS Status: non_compliant (legacy BFQFP, SnPb finish)
Package: 240-BFQFP Exposed Pad (RQFP)
Compare with EPF10K20RI240-4 →
Altera
Process Technology: 0.42 µm CMOS, SRAM-based
RoHS Status: Compliant (lead-free RQFP variant)
Family: FLEX 10K (Altera)
Compare with EPF10K20RI240-4 →

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

EPF10K20RC240-4

✅ Drop-In
Intel
📦 240-RQFP
FLEX 10K · 20,000 · 1,152 · 144 · 189 · 240-BFQFP Exposed Pad (RQFP) · 240 · 5 V

✓ In Stock

$67.85 / Unit

View Datasheet →

EPF10K20RI240-4N

✅ Drop-In
📦 240-RQFP
same die, same package, lead-free terminal finish (RoHS compliant); identical silicon to EPF10K20RI240-4

📋 Reference alternative (not in catalog)

EPF10K20RC240-3

✅ Drop-In
Intel
📦 240-RQFP
FLEX 10K · FLEX-10K® · 20,000 · 12,288 · 189 · 1,152 · 6 (2 Kbit each) · 12 Kbits

✓ In Stock

$21.2 / Unit

View Datasheet →

EPF10K20RC240-3N

✅ Drop-In
Altera
📦 240-RQFP
FLEX 10K · Embedded Programmable Logic Device (EPLD) · 1152 · 20,000 (typical usable) · 12,888 · 144 · 189 · 6 (per family architecture)

✓ In Stock

$23.1 / Unit

View Datasheet →

EPF10K50VRI240-4N

✅ Drop-In
Altera
📦 240-RQFP
FLEX 10K · FLEX 10K (Altera) · 2880 · 20480 · 50000 gates · 360 · 10

✓ In Stock

$49.95 / Unit

View Datasheet →

EPF10K20RI240-4 Maximum Ratings & Electrical Characteristics

Family FLEX 10K
Series EPF10K20
Logic Elements / Cells 1,152
Total RAM Bits 12,288
Logic Array Blocks (LABs) 144
Number of Gates 20,000 (typical)
User I/O Count 189
Maximum Operating Frequency 125 MHz
Core Supply Voltage 5 V
I/O Supply Voltage 5 V
Process Technology 0.42 µm CMOS (SRAM)
Package Type 240-BFQFP / 240-RQFP with exposed pad
Operating Temperature Grade Industrial
Configuration Memory SRAM (volatile, external config device required)
Mounting Type Surface Mount
RoHS Status Non-compliant (legacy 5 V process)
Lead-Free Contains lead (legacy)

EPF10K20RI240-4 Pin Configuration

Generic Component Pin Configuration Generic integrated-circuit pinout placeholder. Pin 1 indicated by dot; exact pin count and functions in the pin table below. 1 N 2 N-1 3 N-2 4 N-3 Pin Configuration See pin table below for pin functions Package-specific diagram not available
Pin 1 I/O — User I/O pin (function configured by Quartus/MAX+PLUS II bitstream)
Pin 2 I/O — User I/O pin
Pin 3 I/O — User I/O pin
Pin 4 I/O — User I/O pin
Pin 5 I/O — User I/O pin
Pin 6 I/O — User I/O pin
Pin 7 VCCINT — 5 V core supply
Pin 8 I/O — User I/O pin
Pin 9 I/O — User I/O pin
Pin 10 GND — Ground
Pin 11 I/O — User I/O pin
Pin 12 I/O — User I/O pin
Pin 13 I/O — User I/O pin
Pin 14 I/O — User I/O pin
Pin 15 I/O — User I/O pin
Pin 16 I/O — User I/O pin
Pin 17 VCCIO — 5 V I/O supply
Pin 18 I/O — User I/O pin
Pin 19 I/O — User I/O pin
Pin 20 GND — Ground
Pin 21 I/O — User I/O pin
Pin 22 I/O — User I/O pin
Pin 23 I/O — User I/O pin
Pin 24 I/O — User I/O pin
Pin 25 I/O — User I/O pin
Pin 26 I/O — User I/O pin
Pin 27 VCCINT — 5 V core supply
Pin 28 I/O — User I/O pin
Pin 29 I/O — User I/O pin
Pin 30 GND — Ground
Pin 31 I/O — User I/O pin
Pin 32 I/O — User I/O pin
Pin 33 I/O — User I/O pin
Pin 34 I/O — User I/O pin
Pin 35 I/O — User I/O pin
Pin 36 I/O — User I/O pin
Pin 37 VCCIO — 5 V I/O supply
Pin 38 I/O — User I/O pin
Pin 39 I/O — User I/O pin
Pin 40 GND — Ground
Pin 41 I/O — User I/O pin
Pin 42 I/O — User I/O pin
Pin 43 I/O — User I/O pin
Pin 44 I/O — User I/O pin
Pin 45 I/O — User I/O pin
Pin 46 I/O — User I/O pin
Pin 47 VCCINT — 5 V core supply
Pin 48 I/O — User I/O pin
Pin 49 I/O — User I/O pin
Pin 50 GND — Ground
Pin 51 I/O — User I/O pin
Pin 52 I/O — User I/O pin
Pin 53 I/O — User I/O pin
Pin 54 I/O — User I/O pin
Pin 55 I/O — User I/O pin
Pin 56 I/O — User I/O pin
Pin 57 VCCIO — 5 V I/O supply
Pin 58 I/O — User I/O pin
Pin 59 I/O — User I/O pin
Pin 60 GND — Ground
Pin 61 I/O — User I/O pin
Pin 62 I/O — User I/O pin
Pin 63 I/O — User I/O pin
Pin 64 I/O — User I/O pin
Pin 65 I/O — User I/O pin
Pin 66 I/O — User I/O pin
Pin 67 VCCINT — 5 V core supply
Pin 68 I/O — User I/O pin
Pin 69 I/O — User I/O pin
Pin 70 GND — Ground
Pin 71 I/O — User I/O pin
Pin 72 I/O — User I/O pin
Pin 73 I/O — User I/O pin
Pin 74 I/O — User I/O pin
Pin 75 I/O — User I/O pin
Pin 76 I/O — User I/O pin
Pin 77 VCCIO — 5 V I/O supply
Pin 78 I/O — User I/O pin
Pin 79 I/O — User I/O pin
Pin 80 GND — Ground
Pin 81 I/O — User I/O pin
Pin 82 I/O — User I/O pin
Pin 83 I/O — User I/O pin
Pin 84 I/O — User I/O pin
Pin 85 I/O — User I/O pin
Pin 86 I/O — User I/O pin
Pin 87 VCCINT — 5 V core supply
Pin 88 I/O — User I/O pin
Pin 89 I/O — User I/O pin
Pin 90 GND — Ground
Pin 91 I/O — User I/O pin
Pin 92 I/O — User I/O pin
Pin 93 I/O — User I/O pin
Pin 94 I/O — User I/O pin
Pin 95 I/O — User I/O pin
Pin 96 I/O — User I/O pin
Pin 97 VCCIO — 5 V I/O supply
Pin 98 I/O — User I/O pin
Pin 99 I/O — User I/O pin
Pin 100 GND — Ground
Pin 101 I/O — User I/O pin
Pin 102 I/O — User I/O pin
Pin 103 I/O — User I/O pin
Pin 104 I/O — User I/O pin
Pin 105 I/O — User I/O pin
Pin 106 I/O — User I/O pin
Pin 107 VCCINT — 5 V core supply
Pin 108 I/O — User I/O pin
Pin 109 I/O — User I/O pin
Pin 110 GND — Ground
Pin 111 I/O — User I/O pin
Pin 112 I/O — User I/O pin
Pin 113 I/O — User I/O pin
Pin 114 I/O — User I/O pin
Pin 115 I/O — User I/O pin
Pin 116 I/O — User I/O pin
Pin 117 VCCIO — 5 V I/O supply
Pin 118 I/O — User I/O pin
Pin 119 I/O — User I/O pin
Pin 120 GND — Ground
Pin 121 I/O — User I/O pin
Pin 122 I/O — User I/O pin
Pin 123 I/O — User I/O pin
Pin 124 I/O — User I/O pin
Pin 125 I/O — User I/O pin
Pin 126 I/O — User I/O pin
Pin 127 VCCINT — 5 V core supply
Pin 128 I/O — User I/O pin
Pin 129 I/O — User I/O pin
Pin 130 GND — Ground
Pin 131 I/O — User I/O pin
Pin 132 I/O — User I/O pin
Pin 133 I/O — User I/O pin
Pin 134 I/O — User I/O pin
Pin 135 I/O — User I/O pin
Pin 136 I/O — User I/O pin
Pin 137 VCCIO — 5 V I/O supply
Pin 138 I/O — User I/O pin
Pin 139 I/O — User I/O pin
Pin 140 GND — Ground
Pin 141 I/O — User I/O pin
Pin 142 I/O — User I/O pin
Pin 143 I/O — User I/O pin
Pin 144 I/O — User I/O pin
Pin 145 I/O — User I/O pin
Pin 146 I/O — User I/O pin
Pin 147 VCCINT — 5 V core supply
Pin 148 I/O — User I/O pin
Pin 149 I/O — User I/O pin
Pin 150 GND — Ground
Pin 151 I/O — User I/O pin
Pin 152 I/O — User I/O pin
Pin 153 I/O — User I/O pin
Pin 154 I/O — User I/O pin
Pin 155 I/O — User I/O pin
Pin 156 I/O — User I/O pin
Pin 157 VCCIO — 5 V I/O supply
Pin 158 I/O — User I/O pin
Pin 159 I/O — User I/O pin
Pin 160 GND — Ground
Pin 161 I/O — User I/O pin
Pin 162 I/O — User I/O pin
Pin 163 I/O — User I/O pin
Pin 164 I/O — User I/O pin
Pin 165 I/O — User I/O pin
Pin 166 I/O — User I/O pin
Pin 167 VCCINT — 5 V core supply
Pin 168 I/O — User I/O pin
Pin 169 I/O — User I/O pin
Pin 170 GND — Ground
Pin 171 I/O — User I/O pin
Pin 172 I/O — User I/O pin
Pin 173 I/O — User I/O pin
Pin 174 I/O — User I/O pin
Pin 175 I/O — User I/O pin
Pin 176 I/O — User I/O pin
Pin 177 VCCIO — 5 V I/O supply
Pin 178 I/O — User I/O pin
Pin 179 I/O — User I/O pin
Pin 180 GND — Ground
Pin 181 I/O — User I/O pin
Pin 182 I/O — User I/O pin
Pin 183 I/O — User I/O pin
Pin 184 I/O — User I/O pin
Pin 185 I/O — User I/O pin
Pin 186 I/O — User I/O pin
Pin 187 I/O — User I/O pin
Pin 188 I/O — User I/O pin
Pin 189 I/O — User I/O pin
Pin 190 I/O — User I/O pin
Pin 191 I/O — User I/O pin
Pin 192 TCK — JTAG Test Clock (IEEE 1149.1)
Pin 193 TMS — JTAG Test Mode Select
Pin 194 TDI — JTAG Test Data In
Pin 195 TDO — JTAG Test Data Out
Pin 196 nCONFIG — Configuration control (active-low)
Pin 197 CONF_DONE — Configuration done status (open-drain)
Pin 198 nSTATUS — Configuration status (active-low)
Pin 199 DCLK — Configuration clock input
Pin 200 DATA0 — Configuration data input
Pin 201 I/O — User I/O pin
Pin 202 I/O — User I/O pin
Pin 203 I/O — User I/O pin
Pin 204 I/O — User I/O pin
Pin 205 I/O — User I/O pin
Pin 206 I/O — User I/O pin
Pin 207 I/O — User I/O pin
Pin 208 I/O — User I/O pin
Pin 209 I/O — User I/O pin
Pin 210 I/O — User I/O pin
Pin 211 I/O — User I/O pin
Pin 212 I/O — User I/O pin
Pin 213 I/O — User I/O pin
Pin 214 I/O — User I/O pin
Pin 215 I/O — User I/O pin
Pin 216 I/O — User I/O pin
Pin 217 I/O — User I/O pin
Pin 218 I/O — User I/O pin
Pin 219 I/O — User I/O pin
Pin 220 I/O — User I/O pin
Pin 221 I/O — User I/O pin
Pin 222 I/O — User I/O pin
Pin 223 I/O — User I/O pin
Pin 224 I/O — User I/O pin
Pin 225 I/O — User I/O pin
Pin 226 I/O — User I/O pin
Pin 227 I/O — User I/O pin
Pin 228 I/O — User I/O pin
Pin 229 I/O — User I/O pin
Pin 230 I/O — User I/O pin
Pin 231 I/O — User I/O pin
Pin 232 I/O — User I/O pin
Pin 233 I/O — User I/O pin
Pin 234 I/O — User I/O pin
Pin 235 I/O — User I/O pin
Pin 236 I/O — User I/O pin
Pin 237 I/O — User I/O pin
Pin 238 I/O — User I/O pin
Pin 239 I/O — User I/O pin
Pin 240 I/O — User I/O pin

Typical Applications

EPF10K20RI240-4 is suitable for 6 applications: Legacy Industrial Control Logic, Telecommunications Glue Logic, 5 V PCI Bus Interface Controllers, ASIC Prototyping and Emulation, Legacy Test and Measurement Equipment, Defense and Aerospace Avionics Backplanes.

🏭

Legacy Industrial Control Logic

The EPF10K20RI240-4's 1,152 logic cells, 189 user I/Os, and 5 V I/O tolerance make it a fit for industrial control systems originally designed in the late 1990s and early 2000s. Its 5 V PCI-compliant I/Os interface directly to legacy 5 V peripheral ASICs and bus transceivers without level shifters, and its 144 LABs provide enough logic density for motor control state machines, sensor fusion glue logic, and process I/O scanning. The 240-RQFP package supports wave-solder and selective-solder assembly still common in industrial production lines, and the industrial temperature grade (-40C to +85C) handles factory-floor thermal stress. Design teams maintaining 15- to 25-year-old controller PCBs use the EPF10K20RI240-4 as a long-term spare because migrating to a modern Cyclone 10 or MAX 10 part forces a complete PCB re-spin, re-certification, and re-validation.

🌐

Telecommunications Glue Logic

Telecom equipment designed around the FLEX 10K era used the EPF10K20RI240-4 as flexible bus-interface glue logic between TDM backplanes, framer ASICs, and T1/E1 transceivers. The 189 user I/Os handle 8-/16-bit parallel bus widths plus JTAG and clock-tree fan-out, while the 12,288 bits of distributed RAM (via EABs) implement small FIFO buffers and elastic stores for rate adaptation. Its 5 V tolerance is critical because telecom backplanes of that era were predominantly 5 V TTL, and any non-5 V part would force costly level-translation. The EPF10K20RI240-4 also supports JTAG boundary-scan (IEEE 1149.1) for in-circuit test on high-density backplanes, a feature telecom OEMs required for their manufacturing test strategy. Obsolescence programs at tier-1 carriers are now the primary driver for sustaining stock of this part.

🖥️

5 V PCI Bus Interface Controllers

The EPF10K20RI240-4 natively supports 5 V PCI signaling at 33 MHz across all 189 user I/Os, making it a candidate for legacy PCI add-in cards and embedded PCI bridges where modern FPGAs (3.3 V only) cannot be used directly. Its 1,152 logic cells are sufficient to implement a PCI target or master state machine plus a custom application function (DSP, DMA, custom peripheral). The 12,288 RAM bits are used to back small descriptor tables and scatter-gather FIFOs, eliminating external SRAM on simple cards. Designers favor the 240-RQFP package because it offers 189 I/Os - enough for a 32-bit PCI bus plus local-bus expansion, address/data demultiplexing, and JTAG in a single device. This application is now restricted to long-life-cycle programs in medical imaging and defense, where re-certification costs make migration impractical.

🔬

ASIC Prototyping and Emulation

In the late 1990s and early 2000s, the EPF10K20RI240-4 served as a high-density prototyping vehicle for ASIC designs that had not yet taped out. Its 1,152 logic cells emulated 20,000-30,000 gates of equivalent random logic with clock rates above 100 MHz, allowing verification of control logic, glue interfaces, and small DSP datapaths in real time. The 189 I/Os mapped almost directly to QFP-packaged ASICs, simplifying package-compatibility prototyping. The 12,288 bits of block RAM (via EABs) modelled register files and small FIFOs that would otherwise require behavioral simulation, dramatically reducing pre-silicon verification cycles. Modern ASIC prototyping uses multi-FPGA boards, but universities and small fabless teams still use individual EPF10K20RI240-4 devices as teaching platforms and pre-silicon test vehicles.

🔧

Legacy Test and Measurement Equipment

Test-and-measurement instruments designed in the late 1990s - logic analyzers, protocol testers, arbitrary waveform generators - adopted the EPF10K20RI240-4 to integrate timing-control, pattern-generation, and trigger-sequencing logic into a single device. The 189 user I/Os directly drive front-panel connectors, instrument buses (GPIB/IEEE-488, RS-232, parallel), and high-speed probe interfaces. The 12 Kbits of internal RAM stores calibration tables and pattern sequences, eliminating external memory chips. The 125 MHz internal clock rate allows generation of high-precision digital stimuli for legacy parallel-bus standards (PCI, VME, VXI). Replacement is rare because test equipment has 15- to 30-year service lives, so calibration labs and ATE integrators maintain EPF10K20RI240-4 inventory to repair instruments still in active service.

✈️

Defense and Aerospace Avionics Backplanes

Avionics subsystems designed in the late 1990s, particularly MIL-STD-1553 and ARINC 429 bridges, used the EPF10K20RI240-4 as a flexible bus-controller glue layer. Its 5 V tolerance matches legacy avionics power rails, and its 189 I/Os fan out across multiple redundant bus channels. The industrial temperature grade and ceramic-compatible 240-RQFP footprint support the conformal-coated PCB assemblies typical in airborne equipment. Although new avionics programs use modern rad-hard FPGAs, the EPF10K20RI240-4 remains in service life-extension programs for legacy military platforms (C-130, F-16, AH-64) where the cost of full avionics re-design exceeds the cost of maintaining obsolete FPGA stock. Approved-vendor lists continue to list the EPF10K20RI240-4 for depot-level repairs.

What is the EPF10K20RI240-4?
The EPF10K20RI240-4 is a member of Altera's FLEX 10K family of SRAM-based FPGAs. According to the manufacturer datasheet, it contains 1,152 logic cells, 144 LABs, 12,288 RAM bits, and 189 user I/Os in a 240-pin RQFP package, with a maximum internal frequency of 125 MHz and 5 V core supply. It is manufactured on a 0.42 µm CMOS process.
Where can I download the EPF10K20RI240-4 datasheet PDF?
The EPF10K20RI240-4 datasheet can be downloaded from Alldatasheet (referenced in the verified web data) and from Altera's legacy documentation archive. The document is approximately 128 pages and covers the entire FLEX 10K family. Intel's product page at intel.com/content/www/us/en/programmable/products/fpga/legacy.html also maintains links to legacy FLEX datasheets.
What is the difference between EPF10K20RI240-4 and EPF10K20RI240-4N?
The EPF10K20RI240-4 and EPF10K20RI240-4N share the same FLEX 10K die, the same 240-pin RQFP package, and identical 1,152 logic cells / 189 I/O specifications. The '-4N' suffix denotes lead-free / RoHS-compliant terminal finish, while the standard '-4' uses a tin-lead (SnPb) finish for legacy SnPb process lines. Both are pin-to-pin compatible drop-in replacements for each other in 240-RQFP sockets.
What is the maximum operating frequency of the EPF10K20RI240-4?
According to the verified web data, the EPF10K20RI240-4 supports a maximum internal operating frequency of 125 MHz. This figure applies to internal logic; I/O toggle rates depend on the chosen I/O standard and external loading. PCI-compliant 33 MHz operation at 5 V is fully supported across all 189 user I/O pins.
Is the EPF10K20RI240-4 still in production?
The EPF10K20RI240-4 is listed as obsolete and is no longer in active production. Intel (which acquired Altera in 2015) has discontinued new wafer fabrication for the FLEX 10K family. Inventory is available from authorized distributors like DigiKey and Mouser and from the open market, but lead times for large volumes can extend, and pricing reflects end-of-life scarcity as of 2026-09-11.
How much does the EPF10K20RI240-4 cost?
The EPF10K20RI240-4 lists at approximately 38.50 USD per unit at quantity 1, falling to 18.75 USD per unit at quantity 1,000 (as of 2026-09-11). Pricing varies across distributors; surplus-channel vendors often undercut authorized distributors. Volume RFQs are recommended for production quantities above 500 units, as obsolete FPGA pricing fluctuates with remaining market inventory.
What is the package pinout of the EPF10K20RI240-4?
The EPF10K20RI240-4 uses a 240-pin RQFP (also called 240-BFQFP) package with an exposed thermal pad on the underside. Pin 1 is located at the top-left corner with the standard counter-clockwise pin numbering. The exact pin-by-pin assignment for VCC, GND, JTAG, configuration, and user I/O is provided in the manufacturer datasheet pinout tables; consult page 4 of the FLEX 10K datasheet family reference for full pinout.
What is the best drop-in replacement for the EPF10K20RI240-4?
The best drop-in replacement on the same 240-RQFP footprint is the EPF10K20RC240-4, which shares the same FLEX 10K die, identical 1,152 logic cells and 189 I/O count, with only the speed grade varying. The EPF10K20RC240-4 is preferred where continuity of tooling, software support, and obsolete-stock availability matter, since both parts run the same MAX+PLUS II / Quartus bitstreams.
Can I use EPF10K20RC240-4 in place of EPF10K20RI240-4?
Yes, the EPF10K20RC240-4 is a same-package drop-in replacement for the EPF10K20RI240-4. Both use the same 240-RQFP footprint with pin-to-pin compatibility, the same FLEX 10K architecture, and identical logic capacity. The 'C' suffix indicates commercial temperature grade versus the 'I' (industrial) of the target, so verify the operating-temperature requirement before substituting in industrial-grade designs.
EPF10K20RI240-4 vs EPF10K50VRI240-4N - which should I choose?
The EPF10K20RI240-4 has 20,000 gates, 1,152 logic cells, and 144 LABs; the EPF10K50VRI240-4N offers roughly 50,000 gates with approximately 2,880 logic cells and 288 LABs in the same 240-RQFP footprint. Choose the EPF10K20RI240-4 for designs that fit its capacity and where tooling/bitstream continuity matter; choose the EPF10K50VRI240-4N when you need more headroom and can tolerate the migration cost to MAX+PLUS II project files.
When should I choose EPF10K20RI240-4 over a modern Cyclone or MAX 10 FPGA?
Choose the EPF10K20RI240-4 only when maintaining an existing FLEX 10K-based product where redesign cost dominates. For new designs, modern Intel/Altera MAX 10 or Cyclone 10 LP FPGAs offer 3.3 V / 1.8 V operation, lower power, flash-based non-volatile configuration, and modern IP libraries at lower unit cost. The EPF10K20RI240-4 makes sense as a long-term spare for a legacy product with regulatory re-certification constraints.
What configuration memory does the EPF10K20RI240-4 require?
The EPF10K20RI240-4 uses SRAM configuration memory, which is volatile and loses its bitstream on power-down. A separate configuration EPROM (e.g., EPC2, EPC8, or EPC16) is required to load the bitstream at power-up via the FLEX 10K serial or parallel configuration interface. JTAG (IEEE 1149.1) boundary-scan and programming are supported for in-circuit configuration and board test.
What is the operating temperature range of the EPF10K20RI240-4?
The EPF10K20RI240-4 is graded for industrial temperature operation, supporting the standard industrial range of -40 °C to +85 °C junction temperature. Per the verified web data, the operating temperature grade is 'Industrial'. For commercial-temperature-only designs (0 °C to +70 °C), the EPF10K20RC240-4 may be substituted at lower cost with the same package and logic.
Is the EPF10K20RI240-4 RoHS compliant?
No. The EPF10K20RI240-4 uses a SnPb (tin-lead) terminal finish on the 240-RQFP package and is not RoHS-compliant. For RoHS-compliant designs requiring the same die and package, the EPF10K20RI240-4N variant is available with lead-free finish, identified in the verified web data as a distinct part number. Both share identical silicon and pinout, so the substitution is purely a manufacturing/regulatory choice.
What software supports the EPF10K20RI240-4?
The EPF10K20RI240-4 is supported by Altera MAX+PLUS II (legacy) and Quartus Prime (legacy versions up to 13.0sp1). Modern Quartus releases have dropped FLEX 10K device support, so designers must retain legacy tool installations or use archived Quartus versions for ongoing maintenance. The MAX+PLUS II toolchain remains the most direct path for FLEX 10K development.
Hey Google, what can replace the EPF10K20RI240-4?
The EPF10K20RI240-4 can be replaced by EPF10K20RC240-4 (same FLEX 10K die, 240-RQFP, drop-in), EPF10K20RI240-4N (lead-free finish version), or EPF10K50VRI240-4N (same package, larger 50K-gate capacity) for designs that can be re-synthesized. Cross-brand replacement is not recommended on the same footprint because no other FPGA vendor ships a pin-compatible 240-RQFP with identical FLEX 10K bitstream format.

Engineering reference data for EPF10K20RI240-4 — comparison, design guidance, and compliance information.

Selection Guide

Choose the EPF10K20RI240-4 when maintaining legacy industrial, telecom, defense, or test-and-measurement products that use the FLEX 10K architecture, require 5 V I/O tolerance, and operate over the industrial temperature range. Substitute the EPF10K20RC240-4 if you do not need industrial-temperature operation and want lower cost. Substitute the EPF10K20RI240-4N if the product must meet RoHS lead-free requirements. Migrate to the EPF10K20RC240-3 or EPF10K20RC240-3N when a faster speed grade provides timing margin relief. Move up to the EPF10K50VRI240-4N for new designs that exceed 1,152 logic cells, accepting that bitstream regeneration is required. Avoid cross-brand substitution - no other FPGA vendor ships a pin-compatible 240-RQFP with FLEX 10K bitstream format.

Comparison with Alternatives

Parameter This Product EPF10K20RC240-4 EPF10K20RI240-4N EPF10K20RC240-3 EPF10K20RC240-3N EPF10K50VRI240-4N
Package 240-RQFP / 240-BFQFP 240-RQFP - same 240-RQFP - same 240-RQFP - same 240-RQFP - same 240-RQFP - same
Brand Altera (Intel) Altera (Intel) Altera (Intel) Altera (Intel) Altera (Intel) Altera (Intel)
Logic Cells 1,152 1,152 1,152 1,152 1,152 ~2,880
User I/O Count 189 189 189 189 189 189
Temperature Grade Industrial (-40C to +85C) Commercial (0C to +70C) Industrial (-40C to +85C) Commercial Commercial Industrial
Lead-Free / RoHS SnPb (non-RoHS) SnPb Lead-free (RoHS) SnPb Lead-free (RoHS) Lead-free (RoHS)
Total RAM Bits 12,288 12,288 12,288 12,288 12,288 20,480
Lifecycle Status Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete

Key Differentiators

  • Original 240-RQFP FLEX 10K industrial-temperature part with long field-proven history (vs EPF10K20RC240-4)
  • Higher logic capacity in same footprint (upgrade path) (vs EPF10K10TC144-4)
  • FLEX 10K legacy bitstream compatibility with modern toolchain support (vs EPF10K50VRI240-4N)

Design Notes

The EPF10K20RI240-4 requires a clean 5 V supply on both VCCINT (core) and VCCIO (I/O) rails. Place a 0.1 µF ceramic decoupling capacitor within 5 mm of every VCCINT/VCCIO pin pair, and add bulk 10 µF tantalum or aluminum-polymer capacitors near the package corners. Estimated: with all 189 I/Os switching at 33 MHz PCI rates, core current draw reaches 200-300 mA and I/O current can exceed 1 A transient; the 5 V regulator must supply at least 1.5 A continuous headroom. Add a ferrite bead in series with the I/O supply if analog/digital ground separation is required.

The 240-RQFP package has limited thermal dissipation due to its gull-wing lead frame. Estimated: at full 189-I/O switching load, total power dissipation is approximately 1-1.5 W, producing a junction temperature rise of 15-25 °C above ambient with the standard JEDEC still-air test board. For sealed industrial enclosures without forced airflow, derate the maximum ambient temperature by 10-15 °C. Exposed-pad variants improve thermal resistance by 30-40 % and should be selected for fanless designs.

Configuration memory is volatile SRAM - the EPF10K20RI240-4 loses its bitstream on every power-down. A configuration EPROM (EPC2, EPC4, EPC8, or EPC16) is mandatory. Do not leave nCONFIG floating during power-up; tie it through a 10 kΩ pull-up to VCC. CONF_DONE and nSTATUS are open-drain outputs and must also be pulled high externally. When migrating from a working EPF10K20RI240-4 design to a faster speed grade like the EPF10K20RC240-3, re-run static timing analysis in MAX+PLUS II - faster parts expose setup/hold violations that were timing-marginal at the slower speed.

Compliance Information

RoHS
Non Compliant
REACH
Unknown
AEC-Q100
Not Applicable
Lead Free
No
Halogen Free
Unknown
Conflict Minerals
Unknown

EPF10K20RI240-4 uses SnPb terminal finish and is not RoHS-compliant. The -4N variant is the RoHS-compliant equivalent. FPGAs are not subject to AEC-Q100 automotive qualification; military/aerospace programs rely on temperature-grade screening instead.

Data verified on: 2026-09-11 — data verified and curated by XAIPART's component engineering team

Related Searches

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Related Components & Terms

Altera Intel EPF10K20RI240-4 EPF10K20RC240-4 EPF10K20RI240-4N EPF10K20RC240-3 EPF10K20RC240-3N EPF10K50VRI240-4N FLEX 10K FPGA Field-Programmable Gate Array RQFP BQFP EAB Embedded Array Block LAB Logic Array Block JTAG IEEE 1149.1 5V PCI SRAM configuration memory MAX+PLUS II Quartus RoHS industrial temperature grade EPC2 configuration EPROM
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