PIC16C57C-40/SO - 8-bit OTP MCU, 3KB EPROM, 28-SOIC | Microchip
MPN: PIC16C57C-40/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.74 | $2.74 |
| 10 | $2.6 | $26.00 |
| 100 | $2.35 | $235.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.9 | $1,900.00 |
PIC16C57C-40/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripherals on one die. The PIC16C57C belongs to the PIC16C5X baseline family, sitting in the broader hierarchy of microcontroller -> embedded processor -> digital IC -> semiconductor. This category is designed for deterministic, low-cost, low-power control tasks where an entire system can be implemented with one chip plus passives.
Key features include a 40 MHz maximum oscillator input (giving 100 ns instruction cycle), 2K x 12-bit program word organization, 8-bit timer/counter with 8-bit prescaler, watchdog timer with dedicated on-chip RC oscillator, power-on reset, and a wide 2.5V to 6.0V operating range. The C-grade device is specified for the commercial 0C to +70C temperature range. A 12-bit instruction word yields roughly 2:1 code compression over competing 8-bit MCUs, which lowers ROM usage in code-dense applications.
Architecturally, the PIC16C57C uses a Harvard-style separate program/data bus, single accumulator W register, and two-level hardware stack. Its CMOS OTP process delivers low operating current (typically <2 mA at 5V/4 MHz, <30 uA standby) and the device is also available in windowed ceramic EPROM and QTP/SQTP programming options for prototyping. Unlike modern Flash PIC16F parts, the 'C' suffix denotes OTP, so code is locked at production programming.
Typical applications include appliance controllers, automotive subsystems (non-safety), industrial control logic, low-end user-interface boards, and remote sensor transmitters. The 20 I/O pins and 33-instruction RISC core make it well suited to replace discrete logic and small gate arrays.
When designing with the PIC16C57C-40/SO, note that OTP devices cannot be reprogrammed in-circuit; allocate engineering time to verify firmware on a windowed or flash equivalent before committing to OTP. Always place a 0.1 uF decoupling capacitor within 5 mm of VDD, and keep the OSC1/OSC2 trace lengths matched when using a crystal.
This page consolidates distributor pricing, pin-compatible drop-in alternatives, and practical design notes beyond what is found in the manufacturer datasheet.
Drop-in alternatives for PIC16C57C-40/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 PIC16C57C-40/SO (same form factor and footprint) — differing in Package, Program Memory Size, Operating Temperature, Timers, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57C-40/P
✅ Drop-In✓ In Stock
$3.82 / Unit
View Datasheet →PIC16C57C-20/SO
✅ Drop-In✓ In Stock
$2.89 / Unit
View Datasheet →PIC16C57C-20E/SO
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →PIC16C57C-20I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.9 / Unit
View Datasheet →PIC16C57CT-40/SO
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C56A-20I/SS
✅ Drop-In✓ In Stock
$0.67 / Unit
View Datasheet →PIC16C57C-40/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3 KB (2K x 12-bit) |
| RAM | 72 bytes |
| Data EEPROM | Not present (OTP only) |
| Instruction Set | 33 single-word instructions, 12-bit wide |
| Maximum Clock Frequency | 40 MHz (10 MHz instruction rate, 100 ns cycle) |
| Operating Voltage Range | 3.0 V to 5.5 V (per family datasheet) |
| I/O Pins | 20 |
| Timers | 1 x 8-bit with 8-bit prescaler |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Power-on Reset | Yes |
| Brown-out Reset | Not present on baseline PIC16C5X |
| Interrupt Sources | 4 (external RB0/INT, TMR0, GPIO change, EEPROM write) |
| Operating Temperature Range | 0 C to +70 C (commercial, -40 to +85 C on 'I' grade) |
| Package | 28-SOIC (SO), 0.295 inch / 7.50 mm body width |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (lead-free SO package) |
PIC16C57C-40/SO Pin Configuration
| Pin 1 | RA2 — Port A bit 2 (bidirectional I/O) |
| Pin 2 | RA3 — Port A bit 3 (bidirectional I/O) |
| Pin 3 | RA4 — Port A bit 4 (bidirectional I/O, open-drain option) |
| Pin 4 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Port B bit 0 / external interrupt input |
| Pin 7 | RB1 — Port B bit 1 |
| Pin 8 | RB2 — Port B bit 2 |
| Pin 9 | RB3 — Port B bit 3 |
| Pin 10 | RB4 — Port B bit 4 |
| Pin 11 | RB5 — Port B bit 5 |
| Pin 12 | RB6 — Port B bit 6 |
| Pin 13 | RB7 — Port B bit 7 |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock-out Fosc/4 |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RC0 — Port C bit 0 |
| Pin 18 | RC1 — Port C bit 1 |
| Pin 19 | RC2 — Port C bit 2 |
| Pin 20 | RC3 — Port C bit 3 |
| Pin 21 | RC4 — Port C bit 4 |
| Pin 22 | RC5 — Port C bit 5 |
| Pin 23 | RC6 — Port C bit 6 |
| Pin 24 | RC7 — Port C bit 7 |
| Pin 25 | VDD — Positive supply voltage |
| Pin 26 | RA0 — Port A bit 0 |
| Pin 27 | RA1 — Port A bit 1 |
| Pin 28 | VDD — Positive supply voltage |
Typical Applications
PIC16C57C-40/SO is suitable for 6 applications: Appliance Control Board, Automotive Body Electronics (non-safety), Industrial Control Logic Replacement, Remote Sensor Transmitter, Low-End User Interface Board, Cost-Sensitive Consumer Electronics.
Appliance Control Board
The PIC16C57C-40/SO suits appliance controllers such as washing machines, dishwashers, and microwave ovens where a low-cost OTP MCU drives relays, keypads, and LED indicators. Its 3 KB of OTP memory comfortably holds typical appliance state machines, and the 100 ns instruction cycle allows tight loop control of triac-firing angles for motor-speed or heater-phase regulation. The 20 I/O pins map directly to seven-segment displays and multiplexed keypads without external glue logic, while the commercial temperature range is adequate for indoor appliance enclosures.
Recommended
Automotive Body Electronics (non-safety)
The PIC16C57C-40/SO is used in automotive body modules such as interior lighting controllers, window lift switches, and seat-position memories where functional safety requirements are modest. Its 33-instruction baseline core is well understood and supported by long-stable compilers, and the 20 I/O lines can drive small MOSFET bridges directly. For non-safety body modules the commercial temperature grade is acceptable when the module is mounted inside the cabin; for under-hood applications, choose the -40 to +125C 'E' grade variant.
Recommended
Industrial Control Logic Replacement
The PIC16C57C-40/SO replaces discrete CMOS/TTL logic on legacy industrial boards where a small microcontroller is cheaper than the gates it replaces. With 3 KB of OTP memory it can hold ladder-logic-style sequencing programs that drive 20 I/O points, including optoisolated inputs and solid-state relay outputs. The wide 2.5 V to 6.0 V operating range lets it run directly from 5 V industrial rails without a separate regulator, simplifying retrofit boards.
Recommended
Remote Sensor Transmitter
The PIC16C57C-40/SO is well matched to remote sensor transmitters where it wakes up periodically, reads a sensor, transmits a brief packet over UART or PWM, and returns to sleep. Its low standby current (typically under 30 uA on the CMOS 'C' grade) and 100 ns active execution help extend battery life across thousands of transmissions. The 8-bit timer with prescaler provides convenient wake-up intervals without external RTC chips.
Recommended
Low-End User Interface Board
The PIC16C57C-40/SO drives low-end user-interface boards such as vending-machine selection panels, exercise-equipment keypads, and HVAC zone controllers. With 20 I/O pins it can scan an 8x3 matrix keypad and drive a 4-digit seven-segment display without external multiplexer ICs. The 3 KB OTP program memory holds the menu structure and timing logic comfortably, and the 40 MHz oscillator gives fast display refresh without visible flicker.
Recommended
Cost-Sensitive Consumer Electronics
The PIC16C57C-40/SO targets cost-sensitive consumer products such as LED light controllers, fan speed controllers, and small kitchen appliances where BOM cost is the primary constraint. The 33-instruction baseline PIC16C5X core compiles to very tight code, reducing OTP usage and per-unit programming cost. The 28-SOIC package is reflow-solderable and supports fully automated assembly at high volume.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57C-40/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57C-40/P | PIC16C57C-20/SO | PIC16C57C-20E/SO | PIC16C57CT-40/SO | PIC16C56A-20I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (0.295 inch) | 28-PDIP - through-hole, NOT surface-mount drop-in | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SSOP (5.30 mm) - smaller footprint |
| Program Memory | 3 KB OTP EPROM | 3 KB OTP EPROM - same | 3 KB OTP EPROM - same | 3 KB OTP EPROM - same | 3 KB OTP EPROM - same | 1 KB OTP EPROM - reduced |
| Max Oscillator Frequency | 40 MHz | 40 MHz - same | 20 MHz -50% | 20 MHz -50% | 40 MHz - same | 20 MHz -50% |
| RAM | 72 bytes | 72 bytes - same | 72 bytes - same | 72 bytes - same | 72 bytes - same | 72 bytes - same |
| I/O Pins | 20 | 20 - same | 20 - same | 20 - same | 20 - same | 20 - same |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C - same | 0 C to +70 C - same | -40 C to +125 C - extended | 0 C to +70 C - same | -40 C to +85 C - industrial |
| Shipping Format | Tube | Tube - same | Tube - same | Tube - same | Tape-and-reel | Tape-and-reel |
Key Differentiators
- Maximum 40 MHz oscillator input for 100 ns instruction cycle (vs PIC16C57C-20/SO)
- Tube-format shipping versus tape-and-reel (vs PIC16C57CT-40/SO)
- 3 KB OTP versus reduced 1 KB OTP on smaller PIC16C56A (vs PIC16C56A-20I/SS)
- Commercial 0C to +70C grade for indoor appliance cost-down (vs PIC16C57C-20E/SO)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of each VDD pin (pins 25 and 28 on the 28-SOIC) and a bulk 10 uF electrolytic on the same supply node. The PIC16C57C-40/SO operating current is typically below 2 mA at 5 V/4 MHz, so a small regulator such as an MCP1700 is adequate. Do not share the MCU VDD with inductive loads; isolate relay and triac supplies to prevent MCU supply dips during commutation.
When using a crystal on OSC1/OSC2 (pins 15 and 16), keep the trace lengths matched and short, surrounded by a ground guard ring. For a 40 MHz oscillator, load capacitance values must follow the crystal manufacturer's specification (typically 15-33 pF on each pin). Series resistor of 100-470 ohm on OSC2 can be required to limit drive level and prevent oscillator overdrive, per the PIC16C5X family datasheet.
MCLR (pin 4) requires a 10 kohm pull-up to VDD and a 0.1 uF decoupling capacitor to ground for noise immunity. Long MCLR traces can pick up switching noise that triggers spurious resets. If MCLR is tied directly to VDD without the RC network, add at least a 100 nF decoupling capacitor close to the pin to filter high-frequency noise from adjacent switching traces.
Do not assume a 'C' grade (commercial 0C to +70C) part can survive under-hood or industrial environments; choose the 'I' or 'E' grade variant for -40C operation. Remember that the PIC16C57C is OTP - once programmed, code is permanent, so always verify firmware on a windowed PIC16C57C-40/JW or on the Flash-based PIC16F57-I/SO before committing to OTP production. Brown-out reset is NOT present on the PIC16C5X baseline family; design the supply ramp to be monotonic and slower than the internal POR release time.
Compliance Information
RoHS-compliant lead-free SOIC package per Microchip product page. Not AEC-Q100 qualified - choose PIC16C57C-20E/SO for automotive-grade temperature range. Halogen-free status not explicitly stated in the verified web data; marked unknown.
