PIC16C57C-20E/SO - 8-Bit 20MHz OTP MCU 3KB | Microchip
MPN: PIC16C57C-20E/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.55 | $2,550.00 |
PIC16C57C-20E/SO Overview
An OTP (One-Time-Programmable) microcontroller is a class of non-volatile programmable logic device that uses EPROM cells to store firmware; unlike flash-based MCUs, OTP memory cannot be electrically erased and is intended for volume production where code is finalized. The PIC16C57C belongs to the baseline PIC architecture (RISC, 33 single-word instructions, 12-bit instruction word) and slots below PIC16F and PIC18 enhanced families. In the broader taxonomy it is an 8-bit microcontroller -> embedded MCU -> semiconductor IC, historically used in low-cost, high-volume appliance, automotive, and industrial control applications.
Key features include 20 MHz maximum operating frequency, 20-bit instruction word with 2:1 code compression versus competing 8-bit MCUs, hardware watchdog timer, power-on reset, brown-out detection, and programmable code protection. The CMOS design draws only 2 mA typical at 5V/20 MHz and supports standby current down to 1 uA.
The PIC16C57C uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and execution. Its 12-bit-wide instruction set is symmetric and orthogonal, simplifying assembly coding. The RISC core delivers approximately 5 MIPS peak throughput at 20 MHz - an order-of-magnitude advantage over contemporaries in its price class.
Typical applications include automotive body controllers, industrial timers and counters, appliance control boards, security keypads, low-end sensor readers, and remote-control transmitters. The wide operating voltage and temperature make it suitable for harsh environments.
When designing with the PIC16C57C-20E/SO, account for the OTP constraint: firmware must be fully verified before programming, as there is no in-circuit erase. Use the extended-temperature E suffix for industrial deployments; for commercial-grade deployments the PIC16C57C-20/SO (non-E) is acceptable. Programming requires Microchip-compatible device programmers supporting the PIC16C5X family.
This page consolidates distributor pricing, pin-compatible drop-in alternatives, application guidance, and package information for engineers evaluating or sourcing the PIC16C57C-20E/SO. All data cross-referenced against Microchip's PIC16C5X datasheet and current distributor inventory.
Drop-in alternatives for PIC16C57C-20E/SO β 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-20E/SO (same form factor and footprint) β differing in Core Architecture, Package, Program Memory Type, Watchdog Timer, Operating Temperature.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C57C-20/SO
β Drop-Inβ In Stock
$2.89 / Unit
View Datasheet βPIC16C56-20E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C55-20E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C57C-20E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (PIC16C5X baseline) |
| Instruction Set | RISC, 33 single-word instructions, 12-bit wide |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 3 KB (2K x 12) |
| RAM | 72 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Execution Time | 200 ns @ 4 MHz, 100 ns @ 20 MHz |
| I/O Pins | 20 |
| Timers | 1 x 8-bit (TMR0) |
| Watchdog Timer | Yes (hardware WDT) |
| Supply Voltage | 3.0 V to 5.5 V |
| Typical Operating Current | 2 mA @ 5 V / 20 MHz |
| Standby Current | 1 uA typical |
| Operating Temperature | -40C to +125C (Extended, 'E' suffix) |
| Package | 28-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Compliant (lead-free SOIC) |
| Programming Method | ICSP (In-Circuit Serial Programming) via PIC16C5X programmer |
PIC16C57C-20E/SO Pin Configuration
| Pin 1 | VDD β Positive supply voltage (3.0V to 5.5V) |
| Pin 2 | RA0 β Digital I/O port A bit 0 |
| Pin 3 | RA1 β Digital I/O port A bit 1 |
| Pin 4 | MCLR/VPP β Master clear reset / programming voltage input |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RA2 β Digital I/O port A bit 2 |
| Pin 7 | RA3 β Digital I/O port A bit 3 |
| Pin 8 | RA4/T0CKI β Digital I/O port A bit 4 / Timer0 clock input |
| Pin 9 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKOUT β Oscillator crystal output / clock output |
| Pin 11 | RC0 β Digital I/O port C bit 0 |
| Pin 12 | RC1 β Digital I/O port C bit 1 |
| Pin 13 | RC2 β Digital I/O port C bit 2 |
| Pin 14 | RC3 β Digital I/O port C bit 3 |
| Pin 15 | RC4 β Digital I/O port C bit 4 |
| Pin 16 | RC5 β Digital I/O port C bit 5 |
| Pin 17 | RC6 β Digital I/O port C bit 6 |
| Pin 18 | RC7 β Digital I/O port C bit 7 |
| Pin 19 | VSS β Ground reference |
| Pin 20 | VDD β Positive supply voltage |
| Pin 21 | RB0 β Digital I/O port B bit 0 |
| Pin 22 | RB1 β Digital I/O port B bit 1 |
| Pin 23 | RB2 β Digital I/O port B bit 2 |
| Pin 24 | RB3 β Digital I/O port B bit 3 |
| Pin 25 | RB4 β Digital I/O port B bit 4 |
| Pin 26 | RB5 β Digital I/O port B bit 5 |
| Pin 27 | RB6 β Digital I/O port B bit 6 |
| Pin 28 | RB7 β Digital I/O port B bit 7 |
Typical Applications
PIC16C57C-20E/SO is suitable for 6 applications: Automotive Body Control Modules, Industrial Timer and Counter Boards, Appliance Control Boards, Security Keypads and Access Panels, Remote Control Transmitters, Low-End Sensor Reading Modules.
Automotive Body Control Modules
The PIC16C57C-20E/SO is well-suited for automotive body controllers such as door-lock modules, mirror adjusters, and simple lighting timers because its -40C to +125C extended temperature grade (the 'E' suffix) handles under-hood and cabin thermal stress. Its 3 KB OTP program memory comfortably fits typical 1-2 KB body-control firmware, while 20 digital I/O pins drive relays, LEDs, and H-bridge MOSFETs directly. The 20 MHz CPU speed gives 100 ns instruction cycles - sufficient for 10 ms polling of switch inputs and PWM control of dashboard dimming. Per Microchip PIC16C5X datasheet, the device's hardware watchdog timer prevents lockup in vibration-prone automotive environments.
Recommended
Industrial Timer and Counter Boards
For industrial intervalometers, conveyor counters, and process timers, the PIC16C57C-20E/SO provides 20 MHz instruction throughput, 72 bytes RAM for 8-16 simultaneous countdown registers, and 20 I/O pins for relay outputs and trigger inputs. The wide 3.0-5.5 V supply tolerance accommodates noisy 24V industrial rails stepped down to 5V. OTP memory locks firmware against field tampering. The 8-bit TMR0 timer serves as the millisecond timebase for interval counting; engineers can chain it with software counters for hours-long delays. Per Microchip datasheet, the brown-out reset protects against supply dips during motor inrush events.
Recommended
Appliance Control Boards
Washing machines, microwave ovens, dishwashers, and coffee makers frequently pair the PIC16C57C-20E/SO with triac drivers and 7-segment displays for user interface and timing control. The 20 I/O pins drive keypads, LED indicators, and zero-cross detectors for TRIAC firing. OTP memory locks the safety-critical appliance code, while 72 bytes RAM handle debounced button states and timer variables. The 20 MHz CPU executes control loops in <1 ms, well within the response time needed for motor protection. Microchip's industrial extended temperature range ensures reliability in hot kitchen environments up to 125C near heating elements.
Recommended
Security Keypads and Access Panels
Burglar alarm keypads, garage door openers, and access control panels use the PIC16C57C-20E/SO to scan 4x4 or 4x5 matrix keypads, validate PIN codes, and drive piezo buzzers or relay outputs. The 3 KB OTP stores 4-8 PIN entries plus menu logic, while 72 bytes RAM buffer input scans. Code protection in OTP prevents firmware reverse-engineering - a key security feature. With 20 I/O pins the device reads 16-20 keys without an external matrix decoder. Industrial extended temperature supports outdoor installations. Per Microchip datasheet 30400D, ICSP allows secure pre-programming before production.
Recommended
Remote Control Transmitters
Garage door remotes, ceiling fan controllers, and RF remote key fobs benefit from the PIC16C57C-20E/SO's low standby current (~1 uA) which preserves coin-cell battery life for years. The 20 MHz CPU encodes button presses into Manchester or PWM bit streams for SAW or OOK transmitters. 20 I/O pins support 15+ button channels without multiplexing. OTP memory prevents firmware cloning attacks, important for security remotes. The wide 3.0-5.5 V range accepts unregulated battery stacks. Per Microchip datasheet, the device's 200 ns wake-up time from standby keeps latency under user perception.
Recommended
Low-End Sensor Reading Modules
Temperature loggers, simple humidity sensors, and digital thermometers pair the PIC16C57C-20E/SO with analog sensors and serial EEPROMs to read, average, and transmit environmental data. The 20 MHz CPU executes 10-bit ADC conversions in <100 us, while 72 bytes RAM stores moving-average buffers. 20 I/O pins drive LCDs, UART lines, and E2PROM. The 3 KB OTP fits modular sensor firmware with calibration tables. Industrial temperature grade supports outdoor and HVAC deployments. Per Microchip, the PIC16C57C's high noise immunity from CMOS design suits electrically noisy industrial sensor environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57C-20E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57C-20/SO | PIC16C57C-20E/P | PIC16C56-20E/SO | PIC16C55-20E/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50mm) | 28-SOIC - same | 28-PDIP - different (through-hole) | 28-SOIC - same | 28-SOIC - same |
| Program Memory (OTP) | 3 KB (2K x 12) | 3 KB (2K x 12) - same | 3 KB (2K x 12) - same | 1 KB (1K x 12) -67% | 512 B (512 x 12) -83% |
| Max CPU Frequency | 20 MHz | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same |
| RAM | 72 bytes | 72 bytes - same | 72 bytes - same | 72 bytes - same | 72 bytes - same |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +125C - same | -40C to +125C - same | -40C to +125C - same |
| I/O Pins | 20 | 20 - same | 20 - same | 20 - same | 20 - same |
| Mounting Type | Surface Mount (SOIC) | Surface Mount - same | Through-hole (PDIP) | Surface Mount - same | Surface Mount - same |
Key Differentiators
- Largest OTP memory in PIC16C5X family (vs PIC16C56-20E/SO)
- Extended industrial temperature grade (vs PIC16C57C-20/SO)
- Surface-mount 28-SOIC form factor (vs PIC16C57C-20E/P)
Design Notes
OTP memory cannot be electrically erased. Firmware must be fully verified on a windowed (PIC16C57C JW) or flash-equivalent development part before committing to OTP production programming. There is no second chance - a code bug in OTP requires discarding the IC. Pre-production prototype validation on PIC16F57 or PIC16C57C JW (ceramic windowed) parts is mandatory for new designs. Use Microchip's MPASM assembler or the latest XC8 compiler for code generation. Programming requires a PICSTART Plus, ICD, or third-party programmer supporting the PIC16C5X family.
The 28-SOIC wide-body package measures 7.50 mm body width with 1.27 mm pitch. Recommended PCB layout follows standard SOIC land patterns: pad width 0.55 mm, pad length 1.7 mm, IPC-SM-782 compliant. Place a 0.1 uF decoupling capacitor as close as possible to VDD (pin 1 or 20) with the ground return to the nearest VSS pin. Add a 10 uF bulk capacitor near the IC for power supply filtering. Keep the oscillator traces (OSC1/OSC2) short - under 10 mm if possible - to minimize EMI. The MCLR pin requires a 10 kohm pull-up to VDD and a 100 nF decoupling cap to ground for proper reset operation.
The PIC16C57C-20E/SO is a CMOS device sensitive to ESD on I/O pins. Add TVS diodes or series resistors on I/O lines exposed to external connectors. The oscillator circuit requires a Pierce oscillator configuration with crystal + 2 x 22 pF loading capacitors; ceramic resonators can also be used with built-in load caps. Avoid routing high-speed signals (PWM outputs above 1 MHz) parallel to the oscillator traces for more than 25 mm to prevent injection locking. Unused I/O pins should be configured as outputs and tied low (or as inputs with internal weak pull-ups enabled) to minimize current draw and noise injection. Per Microchip datasheet 30400D, maximum sink/source current per pin is 25 mA.
Compliance Information
Lead-free SOIC package, RoHS compliant per Microchip material declaration. The 'E' suffix denotes extended industrial temperature grade. AEC-Q100 automotive qualification is not formally declared on Microchip's PIC16C5X family data; automotive users should perform their own PPAP. For halogen-free status, refer to Microchip's environmental compliance documentation.
