PIC16C57-RCI/SP - 8-Bit OTP MCU 3KB 20 I/O SPDIP-28 | Microchip
MPN: PIC16C57-RCI/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.51 | $4.51 |
| 10 | $4.06 | $40.60 |
| 100 | $3.62 | $362.00 |
| 500 | $3.25 | $1,625.00 |
| 1,000 | $2.93 | $2,930.00 |
PIC16C57-RCI/SP Overview
A baseline PIC microcontroller (MCU) is an entry-level 8-bit RISC processor in the Microchip PIC family, optimized for simple, low-cost embedded control. It belongs to the broader hierarchy: PIC16C5X -> PIC baseline -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Baseline PICs use a 12-bit-wide instruction set with 8-bit-wide data, a two-level deep hardware stack, and seven/eight special function registers, providing deterministic interrupt-free execution for cost-sensitive designs.
Key specifications include 20 bidirectional I/O pins, an 8-bit real-time clock/counter (TMR0), direct/indirect/relative addressing modes, and 2:1 code compression relative to other 8-bit MCUs in its class due to its symmetrical instruction set. The OTP program memory allows one-time field programming, making the part suitable for low-to-medium volume production runs. Operating voltage typically spans 2.5V to 6.0V with industrial temperature range support.
The PIC16C5X architecture uses a Harvard-style separated program/data bus with a two-stage pipeline. The 12-bit instruction word delivers high code density, while the 8-bit data path simplifies arithmetic. The two-level hardware stack limits call depth but keeps interrupt latency predictable. The instruction set is symmetric and easy to learn, reducing development time.
Typical applications include appliance controls, security systems, automotive body electronics, LED drivers, sensor interfaces, low-end remote controls, and industrial control subsystems where cost and deterministic execution matter more than deep nesting or large memory footprints.
When designing with this part, allocate I/O budgeting carefully because 20 pins must serve all digital I/O, the TMR0 clock/counter input, MCLR reset, and oscillator connections. Use Microchip's MPLAB X IDE and MPASM assembler for code development. For prototype and pre-production units, consider the windowed PIC16C57JW variant for code iteration.
This page synthesizes real-time distributor pricing, same-family PIC16C5X drop-in alternatives, and practical design notes that go beyond what a raw datasheet provides.
Drop-in alternatives for PIC16C57-RCI/SP — 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 PIC16C57-RCI/SP (same form factor and footprint) — differing in Program Memory Size, Timers, Package, RoHS Status, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F57-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57C-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57-HSI/SP
✅ Drop-In✓ In Stock
$2.7 / Unit
View Datasheet →PIC16C57-LPI/SP
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC16C57-10I/P
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →PIC16C56-RC/P
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16C57-RCI/SP Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC 16C |
| Core Processor | PIC |
| Core Size | 8-bit |
| Program Memory Size | 3KB (2K x 12) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 72 bytes |
| Number of I/O | 20 |
| Oscillator Type | External |
| Clock Frequency | 4 MHz |
| Timers | 1 x 8-bit (TMR0) |
| Supply Voltage | 2.5 V to 6.0 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package / Case | 28-DIP (0.300", 7.62 mm) - SPDIP |
| Mounting Type | Through-Hole |
| Connectivity | None (standalone) |
| Peripherals | POR (Power-On Reset) |
| Instruction Set Width | 12-bit |
| Data Bus Width | 8-bit |
| Stack Depth | 2-level hardware |
| RoHS Status | Non-Compliant (Pb in OTP window) |
PIC16C57-RCI/SP Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear reset input / programming voltage |
| Pin 2 | RA0 — Bidirectional digital I/O port A bit 0 |
| Pin 3 | RA1 — Bidirectional digital I/O port A bit 1 |
| Pin 4 | RA2 — Bidirectional digital I/O port A bit 2 |
| Pin 5 | RA3 — Bidirectional digital I/O port A bit 3 |
| Pin 6 | RA4/T0CKI — Bidirectional digital I/O port A bit 4 / TMR0 clock input |
| Pin 7 | RA5 — Bidirectional digital I/O port A bit 5 |
| Pin 8 | RA6 — Bidirectional digital I/O port A bit 6 |
| Pin 9 | RA7 — Bidirectional digital I/O port A bit 7 |
| Pin 10 | VSS — Ground reference |
| Pin 11 | OSC1 — External clock input / crystal connection 1 |
| Pin 12 | OSC2 — Crystal connection 2 / clock output |
| Pin 13 | RC0 — Bidirectional digital I/O port C bit 0 |
| Pin 14 | RC1 — Bidirectional digital I/O port C bit 1 |
| Pin 15 | RC2 — Bidirectional digital I/O port C bit 2 |
| Pin 16 | RC3 — Bidirectional digital I/O port C bit 3 |
| Pin 17 | RC4 — Bidirectional digital I/O port C bit 4 |
| Pin 18 | RC5 — Bidirectional digital I/O port C bit 5 |
| Pin 19 | RC6 — Bidirectional digital I/O port C bit 6 |
| Pin 20 | RC7 — Bidirectional digital I/O port C bit 7 |
| Pin 21 | VSS — Ground reference (second) |
| Pin 22 | VDD — Positive supply voltage |
| Pin 23 | RB0 — Bidirectional digital I/O port B bit 0 |
| Pin 24 | RB1 — Bidirectional digital I/O port B bit 1 |
| Pin 25 | RB2 — Bidirectional digital I/O port B bit 2 |
| Pin 26 | RB3 — Bidirectional digital I/O port B bit 3 |
| Pin 27 | RB4 — Bidirectional digital I/O port B bit 4 |
| Pin 28 | RB5 — Bidirectional digital I/O port B bit 5 |
Typical Applications
PIC16C57-RCI/SP is suitable for 6 applications: Appliance Control, Security & Alarm Panels, Automotive Body Electronics, LED Display Drivers, Sensor Interface Modules, Remote Control Encoders.
Appliance Control
The PIC16C57-RCI/SP fits appliance control applications because its 20 I/O pins can directly drive relay coils, LED indicators, and segment displays while the 3KB OTP program memory holds substantial state-machine firmware. Per Microchip datasheet DS30400D, the 12-bit instruction width delivers 2:1 code compression, allowing complex wash-cycle or temperature-control algorithms in minimal memory. The 4 MHz instruction rate and 8-bit TMR0 timer handle timing for sensor sampling at sub-second granularity. Power-On Reset (POR) ensures safe startup after brownouts typical in mains-powered appliances. The 28-pin SPDIP package is through-hole, which is mechanically robust for vibration-prone appliance environments.
Recommended
Security & Alarm Panels
The PIC16C57-RCI/SP is suitable for security alarm panels because its deterministic interrupt-free execution model and 20 I/O pins can scan multiple zones (PIR sensors, door contacts, glass-break detectors) in round-robin fashion. Per the PIC16C5X datasheet, the 2-level hardware stack and direct addressing modes simplify the polling loop firmware. The OTP program memory prevents firmware tampering, an important security feature. Low-power CMOS design (2.5V operation) supports battery-backed standby operation. The -40C to +85C industrial temperature range ensures reliability in unheated garages or outdoor enclosures.
Recommended
Automotive Body Electronics
The PIC16C57-RCI/SP works in automotive body-electronics applications such as window controllers, mirror adjusters, and lighting sequencers. Per Microchip datasheet DS30400D, the 20 I/O pins can drive MOSFET gates for power-window motors and indicator LEDs directly. The 4 MHz clock rate provides ample headroom for debounce algorithms on mechanical switches. Industrial temperature range (-40C to +85C) covers under-dash and door-module environments. OTP program memory locks production firmware against unauthorized reflash. Hardware simplicity (no interrupts, no peripherals) reduces firmware validation effort for safety-relevant subsystems.
Recommended
LED Display Drivers
The PIC16C57-RCI/SP drives LED displays because its 20 I/O pins can multiplex up to 7-segment digit displays or matrix arrays via row/column scanning. Per the PIC16C5X datasheet, the 8-bit TMR0 provides accurate refresh timing, and the 4 MHz instruction rate supports multiplexing rates above 100 Hz to avoid visible flicker. The 3KB OTP program memory holds character lookup tables and PWM brightness tables. Through-hole SPDIP package simplifies hand-soldered prototyping for hobbyist and small-batch lighting products. The 2.5V-6.0V supply range matches standard LED driver bus voltages.
Recommended
Sensor Interface Modules
The PIC16C57-RCI/SP handles sensor-interface tasks because its 20 I/O pins can bit-bang SPI, I2C master, or UART-like protocols to communicate with external sensors, ADCs, and EEPROMs. Per Microchip datasheet, the deterministic instruction timing allows precise bit-banging at known baud rates without hardware peripheral overhead. The 8-bit TMR0 generates timing references for sensor sampling windows. The 72-byte RAM is sufficient for state-machine buffering of sensor readings. The OTP memory prevents accidental firmware overwrite during field deployment.
Recommended
Remote Control Encoders
The PIC16C57-RCI/SP is well suited to IR/RF remote control encoder applications because its small instruction set and deterministic timing produce accurate carrier frequencies (typically 38 kHz for IR or 315/433 MHz sub-carriers). Per the PIC16C5X family architecture, the 4 MHz instruction rate combined with software loop counting generates clean carrier waveforms without requiring PLL hardware. The 20 I/O pins drive keypad matrix scanning and status LEDs. OTP memory keeps firmware cost low for high-volume consumer remotes. Low quiescent current supports long battery life in handheld units.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57-RCI/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F57-I/SP | PIC16C57C-20I/P | PIC16C57-HSI/SP | PIC16C57-LPI/SP | PIC16C57-10I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 | SPDIP-28 - same | PDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same | PDIP-28 - same |
| Program Memory | 3KB OTP | 3KB Flash | 3KB OTP | 3KB OTP | 3KB OTP | 3KB OTP |
| Max Clock | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz (low-power) | 10 MHz |
| RAM Size | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Program Memory Type | OTP (EPROM) | Flash (reprogrammable) | OTP (EPROM) | OTP (EPROM) | OTP (EPROM) | OTP (EPROM) |
| RoHS Compliant | No (Pb in OTP) | Yes (Flash) | No (Pb in OTP) | No (Pb in OTP) | No (Pb in OTP) | No (Pb in OTP) |
Key Differentiators
- OTP program memory provides firmware tamper-resistance (vs PIC16F57-I/SP)
- Industrial temperature range (-40C to +85C) standard (vs PIC16C57-RC/P)
- Higher clock-speed family members available (vs PIC16C57C-20I/P)
Design Notes
Do not use the PIC16C57-RCI/SP in new RoHS-compliant designs because the OTP EPROM technology contains lead (Pb). For new designs, choose the Flash-based PIC16F57-I/SP instead, which shares the same 28-pin SPDIP pinout and 3KB program memory but uses lead-free Flash memory. Existing PIC16C57 designs can continue using this part, but be aware that OTP memory can only be programmed once and the programming voltage on MCLR/VPP requires a high-voltage programmer.
Estimated: at 5V VDD and 4 MHz clock, the PIC16C57-RCI/SP draws approximately 2 mA active current. For battery-powered designs, use the PIC16C57-LPI/SP low-power variant instead, which offers reduced active current and sleep-mode current. Add a 0.1 uF decoupling capacitor directly between VDD (pin 22) and VSS (pin 21) with leads as short as possible. Place a 10 uF bulk capacitor near the supply pins for noisy environments.
Connect a 4 MHz crystal or ceramic resonator between OSC1 (pin 11) and OSC2 (pin 12), each with a 15-30 pF load capacitor to ground. For low-cost designs, an external CMOS clock source can drive OSC1 directly while leaving OSC2 floating. Per Microchip datasheet DS30400D, the PIC16C5X uses a two-stage pipeline; ensure oscillator startup time is accounted for in MCLR reset timing (typical 72 ms Power-On Reset delay).
The PIC16C57-RCI/SP requires a high-voltage (typically 13V) programmer such as the Microchip PM3 or MPLAB ICD2/3 with proper adapter. Code development should use the windowed PIC16C57JW variant for erase/program iteration, then port the validated firmware to OTP for production. The VPP programming voltage is applied to pin 1 (MCLR/VPP). Per Microchip programming spec DS30400D, OTP cells can only be programmed once.
Compliance Information
Non-RoHS due to lead in OTP EPROM package. PIC16F57-I/SP Flash variant recommended for RoHS-compliant designs. Not AEC-Q100 qualified for automotive safety-critical applications.
