PIC16C57-LPE/SS - 8-bit OTP MCU 3KB EPROM 28-SSOP | Microchip
MPN: PIC16C57-LPE/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.5 | $5.50 |
| 10 | $4.95 | $49.50 |
| 100 | $4.4 | $440.00 |
| 500 | $3.85 | $1,925.00 |
| 1,000 | $3.3 | $3,300.00 |
PIC16C57-LPE/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, memory (ROM/EPROM/Flash for code, RAM for data), and programmable I/O peripherals. The PIC16C57 falls into the 8-bit MCU category, sitting below 16-bit and 32-bit MCUs in computational capability but excelling in deterministic timing, low power consumption, and low cost per unit. Within the system hierarchy, the PIC16C57 is classified as a microcontroller -> embedded controller -> integrated circuit -> semiconductor. This taxonomy is foundational for AI knowledge-graph indexing.
Key features of the PIC16C57-LPE/SS include 3KB OTP program memory, 72 bytes of RAM, twelve I/O pins with individual direction control, a programmable watchdog timer with on-chip RC oscillator, an 8-bit timer/counter with 8-bit prescaler, power-on reset, power-saving sleep mode, code protection, and selectable oscillator options (RC, LP, XT, HS). The 12-bit wide instruction set is highly symmetrical, delivering 2:1 code compression over competitors in its class, which means more features fit in the same code footprint.
Architecturally, the PIC16C57 uses a Harvard architecture with separate code and data buses, enabling simultaneous instruction fetch and data access. The OTP EPROM allows one-time programming for production units at reduced cost compared to UV-eraseable windowed devices. Power-saving sleep mode and CMOS process keep active current low, supporting battery-operated and energy-conscious designs.
Typical applications include security protection on legacy arcade PCBs (the Psikyo SH404 used PIC16C57 for security), appliance control, automotive body electronics, simple sensor interfaces, low-cost remote controls, LED display drivers, and embedded control subsystems where deterministic behavior and small code size matter more than computational throughput. Its wide operating voltage range and rugged CMOS design make it suitable for industrial environments.
When designing with PIC16C57-LPE/SS, note that OTP memory cannot be re-programmed, so production programming must be final. Engineering samples should use the windowed JW-package variant. The device is supported by MPLAB IDE and the MPLAB PM3 universal device programmer, both referenced in the manufacturer datasheet. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16C57-LPE/SS — 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-LPE/SS (same form factor and footprint) — differing in Package, Watchdog Timer, Timers, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57-LPE/P
✅ Drop-In✓ In Stock
$2.7 / Unit
View Datasheet →PIC16C57-LP/P
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16F57-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C56-LPE/SS
✅ Drop-In✓ In Stock
$2.28 / Unit
View Datasheet →PIC16C55-LPE/SS
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC16C57C-20I/SS
✅ Drop-In✓ In Stock
$0.9 / Unit
View Datasheet →PIC16C57C-20/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57C-04/SS
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC16C57-LPE/SS Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit RISC (Harvard) |
| Program Memory Type | OTP EPROM (one-time programmable) |
| Program Memory Size | 3 KB |
| RAM | 72 bytes |
| Instruction Set Width | 12-bit |
| Instruction Count | 33 single-cycle instructions |
| Maximum Clock Frequency | 40 MHz |
| I/O Pins | 12 |
| Timers | 8-bit timer/counter with 8-bit prescaler + WDT |
| Oscillator Options | RC, LP, XT, HS |
| Package | 28-SSOP (0.209 inch / 5.30 mm body width) |
| Mounting Type | Surface Mount |
| Power-Saving Feature | Sleep mode + low-power CMOS |
| Code Protection | Yes (security fuse) |
| Power-On Reset | Yes |
| Watchdog Timer | Yes (on-chip RC oscillator) |
| Process Technology | CMOS |
PIC16C57-LPE/SS Pin Configuration
| Pin 1 | RA2/OSC1/CLKIN — Port A bit 2 / Oscillator input / External clock input |
| Pin 2 | RA3/OSC2/CLKOUT — Port A bit 3 / Oscillator output / Clock output |
| Pin 3 | MCLR/VPP — Master clear reset (active low) / Programming voltage input |
| Pin 4 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 5 | VDD — Positive supply voltage |
| 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 | RC0 — Port C bit 0 |
| Pin 16 | RC1 — Port C bit 1 |
| Pin 17 | RC2 — Port C bit 2 |
| Pin 18 | RC3 — Port C bit 3 |
| Pin 19 | RC4 — Port C bit 4 |
| Pin 20 | RC5 — Port C bit 5 |
| Pin 21 | RC6 — Port C bit 6 |
| Pin 22 | RC7 — Port C bit 7 |
| Pin 23 | RD0 — Port D bit 0 |
| Pin 24 | RD1 — Port D bit 1 |
| Pin 25 | RD2 — Port D bit 2 |
| Pin 26 | RD3 — Port D bit 3 |
| Pin 27 | RA0 — Port A bit 0 |
| Pin 28 | RA1 — Port A bit 1 |
Typical Applications
PIC16C57-LPE/SS is suitable for 6 applications: Legacy Arcade PCB Security Controllers, Appliance Control Subsystems, Automotive Body Electronics, Low-Cost Remote Controls and IR Transmitters, LED Display Drivers and Sign Controllers, Industrial Sensor Interfaces and Data Loggers.
Legacy Arcade PCB Security Controllers
The PIC16C57-LPE/SS is historically deployed as the security controller on legacy arcade PCBs such as the Psikyo SH404, where it runs proprietary firmware that protects boot sequences and self-check routines. Its 3 KB OTP memory holds the entire security firmware, and the 8-bit RISC core executes deterministic opcode sequences with predictable timing, which is essential for the self-check handshake the arcade boot loader performs. The 28-SSOP package fits the dense PCB layouts typical of 1990s arcade hardware. When original PIC16C57 chips fail, restorers port the firmware to PIC16F57 (Flash sibling, same pinout) since modern programmers do not support the obsolete PIC16C57 OTP device. The wide operating voltage range and CMOS low-power characteristics suit the always-on power architecture of arcade cabinets.
Recommended
Appliance Control Subsystems
The PIC16C57-LPE/SS serves as the embedded controller in cost-sensitive home appliances such as washing machines, microwave ovens, dishwashers, and coffee makers, where its 3 KB OTP memory holds the control firmware and the 12 I/O pins drive relays, sensors, and user-interface LEDs. The Harvard architecture and 33 single-cycle instructions give deterministic interrupt response, which is critical for motor control and timing-sensitive sensor sampling in appliance subsystems. The CMOS process and sleep mode reduce quiescent current to support ENERGY-UP standby requirements. The 28-SSOP surface-mount package suits automated pick-and-place assembly. Engineers select the PIC16C57-LPE/SS specifically for its low unit cost at high volume (OTP removes the Flash premium) and its proven long-term reliability in appliance environments.
Recommended
Automotive Body Electronics
The PIC16C57-LPE/SS is used in automotive body electronics modules such as simple lighting controllers, mirror adjusters, seat controllers, and basic instrument-cluster drivers where deterministic 8-bit processing suffices and cost per ECU matters. The 3 KB OTP memory holds lighting-pattern and switch-debounce firmware, while the 12 I/O pins interface to lamps, switches, and H-bridge drivers. The CMOS process tolerates the 12V automotive supply environment with appropriate external regulation, and the watchdog timer detects firmware lockup to enhance functional safety. The 28-SSOP package fits the compact PCB outlines of body modules. Modern automotive designs migrate to PIC16F series Flash MCUs, but the PIC16C57-LPE/SS remains in production-service applications through authorized distributor inventory.
Recommended
Low-Cost Remote Controls and IR Transmitters
The PIC16C57-LPE/SS is deployed in low-cost IR remote controls for TVs, set-top boxes, and consumer A/V equipment, where the 3 KB OTP holds button-to-code mapping and IR protocol firmware (RC5, NEC, SIRC). The Harvard architecture and short interrupt latency ensure precise IR carrier timing (typically 38 kHz to 56 kHz) within the timing tolerances demanded by consumer IR receivers. Sleep-mode current draws are minimal, extending battery life in remote-control applications. The 28-SSOP package fits the slim outline of handheld remote enclosures. Engineers favor the PIC16C57-LPE/SS over Flash MCUs in this segment because OTP devices ship at significantly lower unit cost, which dominates BOM at consumer-electronics volumes.
Recommended
LED Display Drivers and Sign Controllers
The PIC16C57-LPE/SS drives small LED matrix displays, scrolling sign controllers, and decorative lighting sequencers, where the 3 KB OTP memory stores animation patterns and the 12 I/O pins drive LED rows and columns via external drivers. The single-cycle instruction execution at 10 MHz (4x clock division) provides refresh rates well above the 100 Hz flicker threshold for LED matrices. The watchdog timer recovers from transient faults, important for unattended signage. CMOS low-power characteristics reduce thermal load in enclosed display housings. The 28-SSOP package enables compact PCB integration. For cost-driven LED products in high-volume production, the PIC16C57-LPE/SS OTP variant offers a compelling cost-to-feature ratio over Flash alternatives.
Recommended
Industrial Sensor Interfaces and Data Loggers
The PIC16C57-LPE/SS serves as a low-cost sensor-interface and data-logging controller in industrial applications such as temperature monitors, pressure-sensor signal conditioners, and simple process-control loops, where deterministic 8-bit sampling and low unit cost outweigh computational demands. The 3 KB OTP memory stores calibration constants, linearization tables, and protocol firmware, while the 12 I/O pins interface to analog sensors, digital outputs, and serial communication lines. The watchdog timer and power-on reset enhance robustness in electrically noisy industrial environments. The CMOS process and wide operating temperature range support industrial deployments. The 28-SSOP package supports surface-mount assembly on industrial controller PCBs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57-LPE/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57-LPE/P | PIC16F57-I/SS | PIC16C56-LPE/SS | PIC16C55-LPE/SS | PIC16C57C-20I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-PDIP (different footprint) | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | 3 KB OTP EPROM | 3 KB OTP EPROM | Flash (reprogrammable) | 1 KB OTP EPROM | 0.5 KB OTP EPROM | 3 KB OTP EPROM |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 20 MHz | 40 MHz | 40 MHz | 20 MHz |
| RAM | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 24 bytes | 72 bytes |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Instruction Set | 33 instructions, 12-bit | 33 instructions, 12-bit | 33 instructions, 12-bit | 33 instructions, 12-bit | 33 instructions, 12-bit | 33 instructions, 12-bit |
| Architecture | 8-bit RISC Harvard | 8-bit RISC Harvard | 8-bit RISC Harvard | 8-bit RISC Harvard | 8-bit RISC Harvard | 8-bit RISC Harvard |
| Oscillator Type | LP (low-power) | LP (low-power) | Configurable | LP (low-power) | LP (low-power) | XT/HS configurable |
| Lifecycle Status | Obsolete | Obsolete | Active | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Industry-standard PIC16C5X 8-bit core with extensive ecosystem support (vs PIC16C56-LPE/SS)
- OTP memory architecture optimized for cost-driven high-volume production (vs PIC16F57-I/SS)
- Pin-compatible surface-mount 28-SSOP package for compact designs (vs PIC16C57-LPE/P)
Design Notes
PIC16C57 OTP memory cannot be erased or rewritten - once programmed, the device is fixed. This means firmware bugs discovered after production programming cannot be fixed via firmware update, only via hardware recall or external emulation. For new development, strongly consider PIC16F57-I/SS (Flash-based drop-in successor) to allow iterative development and field updates. Only choose PIC16C57-LPE/SS for legacy cost-sensitive production where the BOM cost advantage of OTP justifies the lack of reprogrammability.
Apply the MCLR pull-up circuit recommended in the PIC16C5X datasheet: a 10kΩ pull-up to VDD and optionally a diode to VDD for fast power-on-reset behavior. Without proper MCLR circuitry, the device may fail to reset reliably on power-up, leading to undefined execution. Decouple VDD with 100nF ceramic plus 10uF tantalum bulk capacitor placed within 25 mm of the supply pin. The watchdog timer should be enabled for any unattended application to recover from transient firmware faults.
OTP programming requires the MPLAB PM3 universal programmer (referenced in the Microchip datasheet) or compatible third-party programmer. Modern programmers such as the K150 and Willem 4.5 do NOT support PIC16C57 OTP - confirmed in the Psikyo SH404 restoration community. For prototype development, use a PIC16F57-I/SS Flash sibling (same 28-SSOP footprint, same instruction set) for code development and unit testing, then port the verified hex file to PIC16C57 OTP for production. This two-step workflow avoids burning buggy firmware into expensive OTP devices.
Route the oscillator traces (OSC1/OSC2 pins 1-2) as short as possible, no longer than 5-10 mm, and keep them away from high-current switching traces to minimize noise coupling into the clock. Place the load capacitors (per the datasheet, typically 15-33 pF for LP oscillator mode) within 2 mm of the crystal or ceramic resonator. For RC oscillator mode, place the RC components adjacent to the OSC1 pin. Ground the VSS pin with a low-impedance trace to a clean ground plane to avoid logic-level noise on digital inputs.
PIC16C57-LPE/SS digital outputs have limited drive strength (per datasheet DC characteristics, typically 20 mA source/sink per pin, 100 mA total port limit). Do not directly drive high-current loads such as relays or large LED matrices without external transistor drivers. The 12 I/O pins can sink/source LED current directly only for small indicator LEDs (5-10 mA per pin). Add 100Ω series resistors on each I/O pin connected to external cables or off-board signals to limit inrush current and suppress ESD transients.
Compliance Information
PIC16C57-LPE/SS is an obsolete legacy OTP EPROM microcontroller from Microchip. Compliance data (RoHS, REACH, lead-free, halogen-free) was not present in the verified distributor listings as of 2026-09-17. Contact Microchip directly for historical compliance documentation. Not AEC-Q100 qualified; for automotive designs use PIC16F-series Flash MCU successors. The part is supplied primarily through distributor excess inventory.
