PIC16C57T-10I/SO - 8-Bit 10MHz OTP MCU 28-SOIC | Microchip
MPN: PIC16C57T-10I/SO ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.45 | $34.50 |
| 100 | $2.95 | $295.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.18 | $2,180.00 |
| 3,000 | $1.92 | $5,760.00 |
PIC16C57T-10I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and peripheral I/O on one die; OTP variants let OEMs pre-program the device in production at lower cost than windowed EPROM while still retaining one-time field customization. The PIC16C5X family targets high-volume cost-sensitive embedded control where deterministic instruction execution, low power, and minimal external component count matter more than raw arithmetic performance. Architecturally, it sits below 16-bit MCUs and far below 32-bit Cortex-M devices but above pure logic-replacement state machines in capability.
Key differentiating features of the PIC16C57T-10I/SO include a 12-bit instruction word with 33 single-word/single-cycle instructions (giving a 2:1 code compression advantage over competing 8-bit MCUs), a fully static CMOS design supporting DC to 10 MHz operation, two 8-bit timer/counters (TMR0 and TMR2-style counter), a watchdog timer, and 20 mA sink capability per I/O for direct LED drive. The Harvard architecture separates program and data buses, eliminating fetch conflicts. Internal RC oscillator options and on-chip power-on reset reduce external component count to a single decoupling capacitor in many applications.
Typical applications include appliance control boards, automotive body electronics (non-safety), consumer remote controls, security keypads, smart card readers, LED display controllers, battery chargers, and small sensor-interface nodes. The wide 2.5V-5.5V supply range, robust I/O, and OTP memory model also suit industrial telemetry, instrumentation front-ends, and legacy equipment retrofits where pin-compatible PIC16C5X sockets already exist on the PCB. A key design trade-off: OTP EPROM cannot be reprogrammed in-circuit, so engineers must use a windowed PIC16C57 (e.g., PIC16C57-10/JW) for prototype development and reserve the OTP /SO variant for production runs.
Drop-in alternatives for PIC16C57T-10I/SO — 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 PIC16C57T-10I/SO (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Core Architecture, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57T-10/SO
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16F57-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57C-20/SO
✅ Drop-In✓ In Stock
$2.89 / Unit
View Datasheet →PIC16C56T-10E/SS
✅ Drop-In✓ In Stock
$1.42 / Unit
View Datasheet →PIC16C55T-10/SO
✅ Drop-In✓ In Stock
$2.2 / Unit
View Datasheet →PIC16C57CT-20I/SO
✅ Drop-In✓ In Stock
$4.05 / Unit
View Datasheet →PIC16C57T-10I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Series | PIC® 16C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3 KB (2K x 12) |
| RAM Size | 72 bytes |
| Maximum Clock Frequency | 10 MHz |
| Instruction Word Width | 12 bits |
| Number of I/O Pins | 20 |
| Timers | 2 x 8-bit |
| Watchdog Timer | Yes |
| Supply Voltage | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-SOIC (7.50 mm width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Instruction Set Size | 33 single-word instructions |
| I/O Sink Current per Pin | 25 mA max |
PIC16C57T-10I/SO Pin Configuration
| Pin 1 | RA2 — Port A bit 2 (I/O) |
| Pin 2 | RA3 — Port A bit 3 (I/O) |
| Pin 3 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 4 | MCLR — Master clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 7 | RB1 — Port B bit 1 (I/O) |
| Pin 8 | RB2 — Port B bit 2 (I/O) |
| Pin 9 | RB3 — Port B bit 3 (I/O) |
| Pin 10 | RB4 — Port B bit 4 (I/O) |
| Pin 11 | RB5 — Port B bit 5 (I/O) |
| Pin 12 | RB6 — Port B bit 6 (I/O) |
| Pin 13 | RB7 — Port B bit 7 (I/O) |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 16 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 17 | RC0 — Port C bit 0 (I/O) |
| Pin 18 | RC1 — Port C bit 1 (I/O) |
| Pin 19 | RC2 — Port C bit 2 (I/O) |
| Pin 20 | RC3 — Port C bit 3 (I/O) |
| Pin 21 | RC4 — Port C bit 4 (I/O) |
| Pin 22 | RC5 — Port C bit 5 (I/O) |
| Pin 23 | RC6 — Port C bit 6 (I/O) |
| Pin 24 | RC7 — Port C bit 7 (I/O) |
| Pin 25 | RD0 — Port D bit 0 (I/O) |
| Pin 26 | RD1 — Port D bit 1 (I/O) |
| Pin 27 | RD2 — Port D bit 2 (I/O) |
| Pin 28 | VDD — Positive supply voltage |
Typical Applications
PIC16C57T-10I/SO is suitable for 7 applications: Appliance Control Boards, Automotive Body Electronics, Consumer Remote Controls, Security Keypads and Access Control, LED Display Controllers, Battery Chargers and Power Management, Industrial Sensor Interface Nodes.
Appliance Control Boards
The PIC16C57T-10I/SO suits washing-machine, dishwasher, and microwave control boards where 20 I/O pins drive relays, seven-segment displays, and keypads. Its 3 KB OTP memory holds typical state-machine firmware, while the -40C to +85C industrial range tolerates under-cabinet thermal stress. The 25 mA sink current directly drives LED indicators and optocouplers without external transistors, reducing BOM cost by 3-5 components per board.
Recommended
Automotive Body Electronics
In non-safety body controllers (window lifts, mirror adjusters, seat controllers), the PIC16C57T-10I/SO delivers reliable 8-bit control with -40C to +85C qualification and 2.5V-5.5V supply tolerance for 12V automotive rails post-regulation. Its 33-instruction RISC core executes deterministic loops for motor PWM and debounce routines, while 25 mA I/O sinks solenoids and LEDs directly. The 28-SOIC package fits in tight PCB cavities behind door panels.
Recommended
Consumer Remote Controls
IR/RF remote controls benefit from the PIC16C57T-10I/SO's low power consumption and 2.5V operation, supporting 2xAAA battery configurations. The 3 KB OTP memory stores button matrix scan tables and transmission protocol firmware (RC5, NEC, SIRC). 20 I/O pins handle 4x5 keypads plus status LEDs, and the 10 MHz clock provides accurate carrier generation for 38 kHz IR and 315/433 MHz RF links with sub-1% duty-cycle error.
Recommended
Security Keypads and Access Control
The PIC16C57T-10I/SO powers PIN-code keypads, RFID reader controllers, and magnetic-stripe interfaces where deterministic scan loops and tamper-resistant OTP memory are critical. The 3 KB OTP holds encryption routines and PIN comparison firmware without exposing code via debug interfaces, while 20 I/O drives 4x4 key matrices, status buzzers, and lock relays. The -40C to +85C range supports outdoor enclosures.
Recommended
LED Display Controllers
The PIC16C57T-10I/SO drives multiplexed 7-segment and dot-matrix LED displays through its 20 high-current I/O pins (25 mA sink each), eliminating external driver transistors in small-format displays. The 10 MHz clock generates accurate refresh intervals (1-2 ms per digit) without flicker, and the 3 KB OTP stores character maps and animation sequences for clock radios, scoreboards, and industrial counters.
Recommended
Battery Chargers and Power Management
The PIC16C57T-10I/SO implements NiCd/NiMH/Li-ion charge profiles with its ADC-free comparator-based voltage sensing and PWM-controlled switching. 20 I/O pins interface with current shunts, temperature sensors, and relay/MOSFET gate drivers, while 2.5V-5.5V operation suits single-cell Li-ion and 6V/12V lead-acid systems after regulation. The OTP memory prevents field firmware tampering in commercial charger products.
Recommended
Industrial Sensor Interface Nodes
The PIC16C57T-10I/SO reads digital sensors, thermistors, and switch contacts in distributed industrial nodes where its -40C to +85C industrial range and 2.5V-5.5V supply tolerance handle 24V industrial rails after regulation. 20 I/O scans multiple sensor inputs, drives 4-20 mA loop interfaces via PWM-filtered DAC, and communicates over UART or SPI to host PLCs. OTP memory locks calibration data and protocol stacks.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57T-10I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57T-10/SO | PIC16F57-I/SO | PIC16C57C-20/SO | PIC16C56T-10E/SS | PIC16C55T-10/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SSOP (same 28-pin family) | 28-SOIC (same) |
| Program Memory Type | OTP EPROM | OTP EPROM | Flash (in-circuit reprogrammable) | OTP EPROM (C-revision) | OTP EPROM | OTP EPROM |
| Program Memory Size | 3 KB (2K x 12) | 3 KB | 3 KB | 3 KB | 1 KB | 768 B |
| Maximum Clock Frequency | 10 MHz | 10 MHz | 10 MHz | 20 MHz | 10 MHz | 10 MHz |
| RAM Size | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 25 bytes | 24 bytes |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +125C (Extended) | 0C to +70C (Commercial) |
| Number of I/O Pins | 20 | 20 | 20 | 20 | 12 | 20 |
Key Differentiators
- Industrial temperature range qualification (vs PIC16C57T-10/SO)
- Flash memory reprogrammability in same footprint (vs PIC16F57-I/SO)
- Highest program memory in PIC16C5X 28-SOIC family (vs PIC16C56T-10E/SS)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 28) of the PIC16C57T-10I/SO, plus a 10 uF bulk capacitor on the same supply trace within 1 inch. The on-chip power-on reset holds the CPU in reset until VDD reaches a valid threshold, but adding the bulk capacitor prevents supply droop during high I/O switching transients when driving LED arrays. A separate analog supply pin is not present on this device; ensure noisy digital switching does not couple into oscillator traces.
Route the oscillator traces (OSC1/OSC2, pins 15-16) as short as possible (under 10 mm) and guard them with a ground plane on both sides. When using a crystal oscillator, place the load capacitors (typically 15-33 pF) within 3 mm of the OSC pins to minimize parasitic inductance. The MCLR pin (pin 4) should have a 10 kohm pull-up resistor to VDD; if not used, it can be tied directly to VDD, but a pull-up allows in-circuit debuggers to assert reset cleanly.
Do not assume OTP EPROM can be reprogrammed in-circuit - the PIC16C57T-10I/SO is one-time programmable only, and attempts to reprogram will fail or damage the device. Always validate firmware on a windowed PIC16C57-10/JW (UV-erasable) or a PIC16F57-I/SO (flash) prototype before committing to OTP production programming. Also verify the programming voltage (typically 13.0 V on VPP) during manufacturing test, as marginal VPP causes unreliable OTP writes and field failures.
Estimated: at 10 MHz clock and 5 V supply with all 20 I/O pins switching at full 25 mA load, the PIC16C57T-10I/SO dissipates approximately 200 mW worst case. With the 28-SOIC thermal resistance (theta_JA) of approximately 80 C/W on a 2-layer JEDEC test board, junction temperature rises 16C above ambient, well within the -40C to +85C industrial range. No heatsink is required; ensure copper pour on VDD/VSS pins provides adequate thermal spreading.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this is a general-purpose industrial MCU, not specifically automotive-qualified. For automotive safety applications requiring AEC-Q100, consider PIC16F57-E/SO extended temp variant or migrate to automotive-grade PIC families.
