PIC16C64AT-10E/PQ - 10MHz 8-Bit OTP MCU, 3.5KB | Microchip
MPN: PIC16C64AT-10E/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $5.95 | $2,975.00 |
| 1,000 | $5.2 | $5,200.00 |
PIC16C64AT-10E/PQ Overview
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, memory (program + data), and configurable I/O on a single die, intended for embedded control tasks where deterministic, low-power operation matters more than raw compute throughput. Within the broader taxonomy, the PIC16C64A belongs to the PIC16 family of mid-range microcontrollers, which sits under the PIC microcontrollers family, microcontrollers (MCU) category, and ultimately the integrated circuits (IC) and semiconductor hierarchies. The mid-range core uses a 14-bit instruction word and Harvard architecture, separating program and data buses for predictable interrupt response.
Key features include the 10 MHz maximum clock rate, 33 I/O pins with individually configurable direction, an integrated 8-bit timer/counter (TMR0) with 8-bit prescaler, a 16-bit timer/counter (TMR1), a watchdog timer for reliable recovery from code faults, and brown-out reset support on common microcontroller architectures of the era. The OTP program memory supports one-time programming, which is well suited to production programming after code freeze, lowering per-unit cost versus ceramic windowed EPROM variants. The 'T' suffix indicates tape-and-reel packaging, while the 'E' denotes the extended temperature grade.
The PIC16C64A uses a RISC instruction set with only 35 single-word instructions, simplifying compiler output and accelerating firmware development in C or assembly. Built around CMOS static logic, the device enters a low-power sleep mode with oscillator halted, ideal for battery-fed or power-budgeted industrial applications. Memory organization maps 128 bytes of data RAM and supports indirect addressing through FSR/INDF for pointer-based data structures.
Typical applications include industrial control and sensor interfaces, automotive body and chassis subsystems, white-goods and appliance controllers, low-cost data acquisition front-ends, and replacement of discrete logic on legacy boards. The 33 I/O count enables direct drive of keypads, LED arrays, and parallel peripherals without external expanders.
When designing with this part, note that OTP memory cannot be re-programmed - code must be verified before programming. Add a 100 nF decoupling capacitor adjacent to each VDD pin and route the MCLR reset line carefully to avoid false resets in electrically noisy industrial environments.
This page consolidates distributor pricing, parametric cross-reference data, and practical design notes that complement the manufacturer datasheet, providing actionable engineering context for procurement and design engineers.
Drop-in alternatives for PIC16C64AT-10E/PQ — 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 PIC16C64AT-10E/PQ (same form factor and footprint) — differing in Maximum Clock Frequency, Operating Temperature Range, Program Memory Size, Program Memory Type, A/D Converter.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C64A-10E/PQ
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PIC16C64AT-10E/TQ
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PIC16C64AT-10/PQ
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PIC16C64AT-04/PQ
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC16C64AT-04E/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C64AT-10E/PQ Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC® 16C |
| Core Architecture | PIC16 (RISC, 14-bit instruction word, Harvard) |
| Program Memory Size | 3.5 KB (2K x 14) OTP |
| Data RAM Size | 128 bytes |
| Maximum Clock Frequency | 10 MHz |
| Operating Supply Voltage | 5 V |
| Number of I/O Pins | 33 |
| Package Type | 44-pin MQFP (PQ) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C (Extended, 'E' suffix) |
| Number of Timers | 2 (TMR0 8-bit + TMR1 16-bit) |
| Watchdog Timer | Yes (on-chip) |
| Program Memory Type | OTP (One-Time Programmable) |
| Instruction Set | 35 single-word instructions |
| RoHS Status | unknown |
PIC16C64AT-10E/PQ Pin Configuration
| Pin 1 | MCLR/VPP — Master clear reset input / Programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/SS/AN4 — PORTA bit 5 / SPI slave select / Analog input 4 |
| Pin 8 | OSC1/CLKIN — Oscillator input / External clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator output / Clock output |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (5V) |
| Pin 12 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6 — PORTB bit 6 |
| Pin 19 | RB7 — PORTB bit 7 |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage (5V) |
| Pin 22 | RC0 — PORTC bit 0 |
| Pin 23 | RC1 — PORTC bit 1 |
| Pin 24 | RC2 — PORTC bit 2 |
| Pin 25 | RC3 — PORTC bit 3 |
| Pin 26 | RC4 — PORTC bit 4 |
| Pin 27 | RC5 — PORTC bit 5 |
| Pin 28 | RC6 — PORTC bit 6 |
| Pin 29 | RC7 — PORTC bit 7 |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage (5V) |
| Pin 32 | RD0 — PORTD bit 0 |
| Pin 33 | RD1 — PORTD bit 1 |
| Pin 34 | RD2 — PORTD bit 2 |
| Pin 35 | RD3 — PORTD bit 3 |
| Pin 36 | RD4 — PORTD bit 4 |
| Pin 37 | RD5 — PORTD bit 5 |
| Pin 38 | RD6 — PORTD bit 6 |
| Pin 39 | RD7 — PORTD bit 7 |
| Pin 40 | RE0/RD — PORTE bit 0 / Read control |
| Pin 41 | RE1/WR — PORTE bit 1 / Write control |
| Pin 42 | RE2/CS — PORTE bit 2 / Chip select |
| Pin 43 | VSS — Ground reference |
| Pin 44 | VDD — Positive supply voltage (5V) |
Typical Applications
PIC16C64AT-10E/PQ is suitable for 6 applications: Industrial Process Control, Automotive Body and Chassis Modules, White-Goods and Appliance Controllers, Low-Cost Data Acquisition Front-Ends, Legacy Board Replacement and Service Stock, Discrete Logic Replacement.
Industrial Process Control
The PIC16C64AT-10E/PQ's 33 GPIO pins and 10 MHz execution rate make it well suited to industrial process controllers reading analog sensors, driving actuators, and managing communication with PLC backplanes. Its extended -40C to +125C temperature grade supports deployment in unheated cabinets, near motors, and on factory floors. The RISC core executes instructions in 4 clock cycles, yielding 1 MIPS at 10 MHz which is sufficient for PID loops sampled at 100 Hz. The two on-chip timers (TMR0 and TMR1) handle PWM generation for motor-speed or valve-position control, and the watchdog protects against firmware lockup in electrically noisy environments. Brown-out reset and the MCLR pin simplify power-up sequencing for systems sharing a 24V industrial bus with switchgear.
Recommended
Automotive Body and Chassis Modules
Automotive body modules (window lifters, mirror controllers, lighting drivers) commonly use the PIC16C64A because of its qualified extended temperature grade, rugged CMOS static design, and AEC-Q-style qualification pedigree inherited from the PIC16C family. The 128 bytes of RAM and 3.5KB OTP memory are adequate for sequenced actuator control and CAN/LIN bridge tasks when paired with an external transceiver. The 33 I/O count directly drives relays, FET gates, and indicator LEDs without external expanders. The 'T' suffix on PIC16C64AT-10E/PQ supports high-volume SMD pick-and-place assembly on automotive-tier production lines. Designers should add ESD protection on I/O pins since automotive load-dump and jump-start transients exceed absolute-maximum ratings of CMOS GPIOs.
Recommended
White-Goods and Appliance Controllers
Washing-machine controllers, dishwasher control panels, microwave ovens, and refrigerator user-interface boards have historically used PIC16C64A-family MCUs because of their low cost, OTP security, and reliable performance across years of continuous duty. The PIC16C64AT-10E/PQ's 33 I/O pins drive 7-segment displays, keypads, buzzer, and relay coils directly. Its 10 MHz clock derives a 1 MIPS execution rate which is more than adequate for state-machine firmware that schedules motor relays, reads temperature sensors, and multiplexes display digits. OTP program memory prevents field tampering and over-the-counter code cloning by service shops. The extended temperature range covers the high-ambient conditions inside appliance enclosures during heat-pump and dryer cycles.
Recommended
Low-Cost Data Acquisition Front-Ends
Sensor-interface boards, multi-channel thermocouple readers, and process instrumentation front-ends often pair the PIC16C64AT-10E/PQ with external ADC chips via SPI or I/O-bit-banged interfaces. The 10 MHz clock and 35-instruction RISC set allow sub-millisecond sample sequencing for 4-8 channels at 100 Hz. The 33 I/O pins provide parallel handshake lines to ADCs, DACs, and 7-segment displays. Brown-out reset and watchdog features protect against field-side voltage glitches. Designers should isolate analog and digital grounds, place 100 nF ceramic decoupling adjacent to VDD, and route MCLR with a low-impedance trace to avoid spurious resets during ESD events on sensor cables.
Recommended
Legacy Board Replacement and Service Stock
Many industrial and medical devices shipped in the late 1990s and early 2000s contain PIC16C64A-series MCUs that must be replaced after decades of service. The PIC16C64AT-10E/PQ remains the canonical authorized replacement because Microchip has kept the part in NRND but not obsolete status for long-life support contracts. Service boards that were designed for the MQFP (PQ) footprint can be repaired with the PIC16C64AT-10E/PQ directly, preserving the original firmware image in OTP memory. For new production runs, Microchip's last-time-buy program ensures multi-year supply. Engineers specifying replacement stock should validate date-code, lot, and ESD handling procedures.
Recommended
Discrete Logic Replacement
Engineers replacing discrete 74HC-series logic gates, latches, and counters with a single programmable controller often select the PIC16C64AT-10E/PQ because its 33 I/O pins can replace dozens of TTL packages while adding timing, sequencing, and self-test features. The 10 MHz clock runs 1 MIPS of deterministic code, well in excess of the propagation-delay budget of 74HC logic. The OTP program memory secures intellectual property against field copying and field modification by unauthorized service personnel. Designers should evaluate whether the MCU's 128 bytes of RAM and 35-instruction RISC set can implement the required state machine and timing logic in firmware without external glue logic.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C64AT-10E/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C64A-10E/PQ | PIC16C64AT-10E/TQ | PIC16C64AT-10/PQ | PIC16C64AT-04/PQ | PIC16C64AT-04E/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin MQFP (PQ) | 44-pin MQFP (PQ) - same | 44-pin TQFP (TQ) - different | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Max Clock Frequency | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 4 MHz | 4 MHz |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| GPIO Count | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Range | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +125C (Extended) |
| Packaging Form | Tape & Reel (T suffix) | Tray / Tube (no T suffix) | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
| Operating Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- Extended industrial temperature range with 10 MHz full-speed grade (vs PIC16C64AT-04E/PQ)
- Tape-and-reel packaging for high-volume SMD assembly (vs PIC16C64A-10E/PQ)
- Long-term NRND supply continuity for legacy industrial systems (vs PIC16F917-I/PT)
Design Notes
Estimated: the PIC16C64AT-10E/PQ typically draws 5-15 mA at 10 MHz with 5V supply, depending on I/O loading and oscillator mode. Decoupling: place a 100 nF ceramic capacitor adjacent to each VDD pin (the MQFP has multiple VDD pins - 11, 21, 31, 44) and a single 10 uF bulk capacitor at the board's power entry. Tie all VSS pins to a low-impedance ground plane to avoid ground bounce that could corrupt I/O reads.
Route the MCLR pin with a low-impedance trace and add an RC network (typically 10 kohm pull-up to VDD with 100 nF to ground) to filter out ESD-induced false resets. Keep the MCLR trace short and away from switching signals such as relay coils or PWM outputs. Place the crystal or resonator as close as possible to OSC1/OSC2 with the load capacitors' ground return pins connected directly to the VSS pin nearest to OSC1/OSC2.
OTP memory on PIC16C64A cannot be erased or rewritten - verify the entire firmware image (checksum, configuration bits, ID locations) on a windowed device or simulator before committing to a production run. Programming voltage on MCLR/VPP during ICSP must reach 13V typical; verify your programmer's VPP compliance. Code-protect bits, once set, prevent re-reading the OTP contents even on a windowed part - configure and test extensively before final programming.
When the PIC16C64AT-10E/PQ drives long cables or relay coils, add TVS diodes or snubber networks to protect I/O pins from inductive kickback exceeding the absolute-maximum voltage of -0.3V to VDD+0.3V. For SPI or I2C communication with external peripherals, keep traces short (under 50 mm) and add series resistors near the source to dampen ringing. Use a single ground reference for analog and digital returns when interfacing to ADCs - star-ground at the MCU's VSS pin.
Compliance Information
RoHS/REACH/lead-free/halogen-free/conconflict-minerals compliance not stated in verified web data for PIC16C64AT-10E/PQ. AEC-Q100 not applicable - PIC16C family is generally not AEC-Q100 qualified. Engineers should request Microchip's environmental compliance certificate for the specific date code before volume procurement.
