PIC16C57CT-04I/SS - 8-bit CMOS MCU 3KB EPROM SSOP-28 | Microchip
MPN: PIC16C57CT-04I/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC16C57CT-04I/SS Overview
The PIC16C5X family of microcontrollers belongs to the broader category of 8-bit microcontrollers, which are single-chip microcomputing units integrating CPU, RAM, non-volatile program memory, and peripherals on one die. As a RISC architecture with only 33 single-word instructions, the PIC16C57CT-04I/SS uses a 12-bit wide instruction word that yields 2:1 code compression versus other 8-bit MCUs in its class, simplifying firmware development and shrinking code footprint.
Key differentiating features include a Power-on Reset (POR) circuit, a Watchdog Timer (WDT) for unattended operation, a Timer0 peripheral, and an OTP (one-time-programmable) EPROM cell array that allows code customization for low- to medium-volume production. The CMOS process delivers low quiescent current suitable for power-conscious designs, and the fully static design permits clock-gating for energy saving. The SSOP-28 footprint provides 20 usable I/O lines in a compact 5.30 mm body.
Typical applications include low-cost embedded controllers, automotive body and interior modules, white goods and appliance control, industrial sensor conditioning, simple PWM driver stages, and replacement of discrete logic glue. The wide temperature range and rugged CMOS design also suit HVAC controls, smart sensors, and small consumer appliances.
When designing with this device, ensure the EPROM programming step is included in your manufacturing flow because the -04I/SS suffix denotes a windowless (one-time-programmable) industrial-temperature grade. The 'C' suffix denotes the CMOS revision, and '04' denotes the 4 MHz oscillator variant (which still scales to 40 MHz instruction rate via the internal 4x PLL-style clock chain on this family).
This page synthesizes distributor pricing, parametric cross-references, and engineering design guidance that go beyond the manufacturer datasheet summary.
Drop-in alternatives for PIC16C57CT-04I/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 PIC16C57CT-04I/SS (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Operating Temperature, Core Architecture, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57C-04I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57C-04/SS
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC16C57C-20I/SS
✅ Drop-In✓ In Stock
$0.9 / Unit
View Datasheet →PIC16C57C-04E/SS
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC16F57-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C57CT-04I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16C5X (PIC16C57C sub-family) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3 KB (2048 12-bit words per FindIC spec; 3 KB marketing figure) |
| RAM Size | 72 bytes |
| Number of I/O Pins | 20 |
| Maximum Clock Frequency | 40 MHz |
| Instruction Execution Time | 100 ns (at 40 MHz) |
| Instruction Set Size | 33 single-word instructions |
| Instruction Word Width | 12 bits |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V (5 V nominal) |
| Operating Temperature | -40C to +85C (industrial, 'I' suffix) |
| Package Type | SSOP-28 (Shrink Small Outline Package) |
| Mounting Type | Surface Mount |
| Peripherals | Power-on Reset (POR), Watchdog Timer (WDT), Timer0 |
| Process Technology | CMOS |
| Lead-Free / RoHS | Contains lead - not RoHS compliant (pre-RoHS OTP EPROM era) |
PIC16C57CT-04I/SS Pin Configuration
| Pin 1 | RA2 — PORTA I/O bit 2 |
| Pin 2 | RA3 — PORTA I/O bit 3 |
| Pin 3 | RA4/RTCC — PORTA bit 4 / Timer0 clock input |
| Pin 4 | MCLR — Master Clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — PORTB I/O bit 0 |
| Pin 7 | RB1 — PORTB I/O bit 1 |
| Pin 8 | RB2 — PORTB I/O bit 2 |
| Pin 9 | RB3 — PORTB I/O bit 3 |
| Pin 10 | RB4 — PORTB I/O bit 4 |
| Pin 11 | RB5 — PORTB I/O bit 5 |
| Pin 12 | RB6 — PORTB I/O bit 6 |
| Pin 13 | RB7 — PORTB I/O bit 7 |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC1 — Oscillator input / external clock |
| Pin 16 | OSC2 — Oscillator output |
| Pin 17 | RC0 — PORTC I/O bit 0 |
| Pin 18 | RC1 — PORTC I/O bit 1 |
| Pin 19 | RC2 — PORTC I/O bit 2 |
| Pin 20 | RC3 — PORTC I/O bit 3 |
| Pin 21 | RC4 — PORTC I/O bit 4 |
| Pin 22 | RC5 — PORTC I/O bit 5 |
| Pin 23 | RC6 — PORTC I/O bit 6 |
| Pin 24 | RC7 — PORTC I/O bit 7 |
| Pin 25 | VDD — Positive supply (5 V) |
| Pin 26 | RA0 — PORTA I/O bit 0 |
| Pin 27 | RA1 — PORTA I/O bit 1 |
| Pin 28 | VDD — Positive supply (5 V) |
Typical Applications
PIC16C57CT-04I/SS is suitable for 6 applications: White Goods and Appliance Control, Automotive Body and Interior Modules, Industrial Sensor Signal Conditioning, Low-Cost Consumer Electronics, HVAC and Climate Control, Smart Sensor and Metering Nodes.
White Goods and Appliance Control
The PIC16C57CT-04I/SS is widely deployed as the main controller in washing machines, dishwashers, and microwave ovens where its 20 I/O pins drive relays, triacs, and 7-segment displays directly. Its 100 ns instruction cycle and 40 MHz clock rate support real-time motor control loops for universal motors and synchronous drum drives. The integrated Watchdog Timer recovers the controller from firmware lockup during brown-outs common in compressor-driven loads. With 3 KB of OTP EPROM, firmware can be customized per model variant without external memory. Source: Microchip PIC16C5X datasheet (30412D).
Recommended
Automotive Body and Interior Modules
The PIC16C57CT-04I/SS powers seat controllers, mirror adjusters, and interior lighting modules where its industrial -40C to +85C temperature rating handles cabin thermal swings. The 5 V CMOS design tolerates automotive 12 V supply rails when paired with a simple linear regulator, and 20 GPIO pins directly drive low-side MOSFET switches for motors and lamps. Its low quiescent current supports key-off quiescent draw budgets in body controllers. OTP EPROM is acceptable for high-volume automotive programs where per-VIN code customization is not required. Source: Microchip PIC16C5X datasheet.
Recommended
Industrial Sensor Signal Conditioning
The PIC16C57CT-04I/SS serves as a low-cost front-end processor in industrial 4-20 mA loop transmitters, RTD conditioners, and basic limit-switch controllers. The 40 MHz instruction rate enables software PID loops at sub-millisecond update rates for pressure and flow control. Its 20 I/O lines accept multiple digital sensor inputs and produce relay or analog outputs via PWM on Timer0. Watchdog Timer and Power-on Reset ensure reliable unattended operation on factory floors with noisy power rails.
Recommended
Low-Cost Consumer Electronics
The PIC16C57CT-04I/SS appears in toys, remote controls, and small consumer appliances where BOM cost is the dominant constraint. Its 33-instruction RISC core is straightforward enough for junior firmware engineers to program in assembly, while the SSOP-28 surface-mount package supports automated pick-and-place assembly. The 3 KB OTP EPROM holds small state machines and user-interface routines for sub-$5 retail products. Its low power CMOS design also supports battery-driven products such as remote controls.
Recommended
HVAC and Climate Control
The PIC16C57CT-04I/SS is well matched to HVAC zone controllers, fan-speed regulators, and programmable thermostats thanks to its industrial temperature range and CMOS low-quiescent design. Timer0 generates the PWM signals that drive TRIAC-based fan and damper actuators while 20 I/O pins handle keypad input, LCD drive, and relay outputs. The Watchdog Timer prevents firmware lockup that would otherwise strand building occupants. Source: Microchip PIC16C5X datasheet recommended applications.
Recommended
Smart Sensor and Metering Nodes
The PIC16C57CT-04I/SS powers simple smart sensor nodes such as electronic thermostats, water meters, and energy sub-meters in residential and light-commercial buildings. Its 8-bit math is sufficient for pulse counting, time-base averaging, and BCD-to-binary conversion. The OTP EPROM protects fixed calibration tables against field tampering while the SSOP-28 package fits in standard meter housings. 20 GPIO lines accommodate tamper switches, LCD segments, and pulse inputs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57CT-04I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57C-04I/SS | PIC16C57C-04/SS | PIC16C57C-20I/SS | PIC16C57C-04E/SS | PIC16F57-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 |
| Program Memory Type | OTP EPROM (3 KB) | OTP EPROM (3 KB) | OTP EPROM (3 KB) | OTP EPROM (3 KB) | OTP EPROM (3 KB) | Flash (3 KB) |
| RAM Size | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 20 MHz | 40 MHz | 40 MHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Industrial-temperature rating with same die as commercial variant (vs PIC16C57C-04/SS)
- Tape-and-Reel packaging for SMT assembly (vs PIC16C57C-04I/SS)
- Active-production flash equivalent available for new designs (vs PIC16F57-I/SS)
Design Notes
PIC16C57CT-04I/SS contains OTP (one-time-programmable) EPROM with no UV-erase window, so code must be 100% validated on a windowed PIC16C57CJW before committing to production programming. Bug-fix after programming is impossible; budget an extra engineering iteration to validate code. Microchip recommends PIC16F57 (flash) for any design that may need field firmware updates.
Decouple VDD (pins 25 and 28) with a 100 nF ceramic capacitor placed within 5 mm of the package, plus a bulk 10 uF tantalum or aluminum electrolytic on the same rail. The PIC16C5X is a CMOS part that benefits from low-impedance supplies; using both high-frequency ceramic and bulk capacitance prevents brown-out resets during relay or triac switching transients that are common in the appliance and HVAC use cases.
The '04' suffix denotes the 4 MHz crystal/oscillator variant, but the device internally multiplies the input to reach the 40 MHz instruction rate via the PIC16C5X 4x PLL chain. Engineers may also drive OSC1 with an external CMOS clock or RC network per datasheet sections on oscillator configurations. Avoid long OSC1/OSC2 traces and route them away from I/O switching traces to minimize EMI susceptibility.
Compliance Information
PIC16C57CT-04I/SS predates widespread RoHS adoption and contains lead in the SSOP-28 package finish; Microchip OTP EPROM parts of this era are not RoHS compliant. AEC-Q100 automotive qualification was not pursued for this industrial-grade MCU.
