PIC16C57T-HS/SO - 8-bit OTP MCU 20MHz 28-SOIC | Microchip
MPN: PIC16C57T-HS/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.39 | $5.39 |
| 10 | $4.85 | $48.50 |
| 100 | $4.21 | $421.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.1 | $3,100.00 |
PIC16C57T-HS/SO Overview
A PIC16C5X microcontroller is a member of the low-cost, high-performance, fully-static 8-bit OTP/EPROM/ROM controller family that uses a 12-bit-wide instruction set. The "base-line" PIC architecture uses a RISC-style instruction set with a small fixed number of single-cycle instructions (excluding branches), 2:1 code compression versus competitive 8-bit controllers in the same price class, and direct register-mapped I/O. Positioned as the simplest member of the PIC16 family, the PIC16C57T-HS/SO typically finds use in cost-sensitive embedded control applications such as consumer appliances, sensor interfaces, and simple state machines.
Key features of the PIC16C57T-HS/SO include 3KB OTP program memory (2K x 12), 72 bytes of general-purpose RAM, a 20MHz maximum external oscillator frequency in HS mode, 20 digital I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, watchdog timer with its own on-chip RC oscillator for reliable operation, Power-on Reset (POR), and a code-protection bit for program security. The wide operating voltage range and CMOS low-power design make the device suitable for both battery-powered and line-powered equipment.
Architecturally, the PIC16C57 uses a Harvard-class two-bus design where program and data memory are accessed through separate paths, allowing an instruction fetch and a data access to occur in the same clock cycle. This two-stage pipeline is what gives the PIC16C5X family its 4:1 effective speed advantage over conventional CISC 8-bit controllers at the same clock rate. The OTP program memory is one-time programmable but allows prototype and production programming flexibility that mask-ROM parts do not.
Typical applications include simple motor control, LED display drivers, security-system sensor interfaces, appliance control boards, remote-control transmitters, and low-cost consumer electronics. Its 20 I/O pins make it well-suited to applications that need to read multiple switches or drive several outputs simultaneously.
When designing with the PIC16C57T-HS/SO, engineers should note that OTP memory cannot be erased; engineering samples should use the PIC16F57 (Flash-based) or a windowed CERDIP PIC16C57 for development. The HS oscillator mode requires an external clock source up to 20MHz, and decoupling capacitors (100nF plus bulk) close to VDD/VSS pins are mandatory.
This page synthesizes distributor stock levels, lifecycle status, same-brand and cross-brand drop-in alternatives, and practical design notes that complement the manufacturer datasheet and standard distributor listings.
Drop-in alternatives for PIC16C57T-HS/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 PIC16C57T-HS/SO (same form factor and footprint) — differing in Core Architecture, Package, Timers, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57-HS/SO
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C57-HSI/SO
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC16C57T-HSI/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C57T-10/SO
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16C57T-10I/SO
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC16C57C-20/SO
✅ Drop-In✓ In Stock
$2.89 / Unit
View Datasheet →PIC16C57T-HS/SO Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Series | PIC 16C |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 3KB (2K x 12) |
| RAM Size | 72 bytes |
| Number of I/O Pins | 20 |
| Oscillator Type | External (HS mode) |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage (Vdd) | 5 V (typical, see datasheet) |
| Package / Case | 28-SOIC (0.295", 7.50mm width) |
| Mounting Type | Surface Mount |
| Peripherals | TMR0 with 8-bit prescaler, Watchdog Timer (WDT) |
| Connectivity | GPIO-only (no UART, I2C, SPI on this base-line device) |
| Packaging Form | Tape & Reel ("T" suffix) |
| Architecture | Harvard-class, 12-bit wide instruction |
PIC16C57T-HS/SO Pin Configuration
| Pin 1 | RA2 — Digital I/O port A bit 2 |
| Pin 2 | RA3 — Digital I/O port A bit 3 |
| Pin 3 | T0CKI — Timer 0 clock input (also I/O) |
| Pin 4 | MCLR — Master clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Digital I/O port B bit 0 |
| Pin 7 | RB1 — Digital I/O port B bit 1 |
| Pin 8 | RB2 — Digital I/O port B bit 2 |
| Pin 9 | RB3 — Digital I/O port B bit 3 |
| Pin 10 | RB4 — Digital I/O port B bit 4 |
| Pin 11 | RB5 — Digital I/O port B bit 5 |
| Pin 12 | RB6 — Digital I/O port B bit 6 |
| Pin 13 | RB7 — Digital I/O port B bit 7 |
| Pin 14 | VSS — Ground reference (secondary) |
| Pin 15 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 16 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 17 | RC0 — Digital I/O port C bit 0 |
| Pin 18 | RC1 — Digital I/O port C bit 1 |
| Pin 19 | RC2 — Digital I/O port C bit 2 |
| Pin 20 | RC3 — Digital I/O port C bit 3 |
| Pin 21 | RC4 — Digital I/O port C bit 4 |
| Pin 22 | RC5 — Digital I/O port C bit 5 |
| Pin 23 | RC6 — Digital I/O port C bit 6 |
| Pin 24 | RC7 — Digital I/O port C bit 7 |
| Pin 25 | RA0 — Digital I/O port A bit 0 |
| Pin 26 | RA1 — Digital I/O port A bit 1 |
| Pin 27 | VDD — Positive supply voltage |
| Pin 28 | VDD — Positive supply voltage (secondary) |
Typical Applications
PIC16C57T-HS/SO is suitable for 7 applications: Consumer Appliance Control, LED Display Driver, Security System Sensor Interface, Remote Control Transmitter, Industrial Sensor Hub, Simple Motor Speed Controller, IoT Edge Sensor Node (Base-line).
Consumer Appliance Control
The PIC16C57T-HS/SO fits appliance-control boards because its 20 I/O pins drive seven-segment displays, keypads, and relay outputs directly while its 3KB OTP memory holds the entire wash-cycle or cooking-mode state table. The 20MHz HS oscillator lets interrupt-driven scan loops keep up with real-time user input without timing glitches, and CMOS low-power design keeps standby current under 4uA - critical for Energy Star compliant appliances.
Recommended
LED Display Driver
The PIC16C57T-HS/SO drives multiplexed LED matrices by sourcing/sinking current on its 20 I/O pins and refreshing rows via the TMR0 interrupt. The 20MHz instruction throughput is sufficient for 8x8 to 16x16 multiplexed panels with no flicker, and the 72-byte RAM buffers one display frame. Using OTP eliminates field-reprogramming costs, ideal for fixed-message signage and indicator panels in industrial equipment.
Recommended
Security System Sensor Interface
The PIC16C57T-HS/SO reads up to 20 zones of PIR, door/window, and smoke-detector contacts through its 20 I/O pins while monitoring internal watchdog and power-on-reset events. The PIC16C5X built-in WDT ensures the system recovers from firmware or EMI upsets - a critical feature for alarm panels. OTP prevents reverse-engineering of proprietary alarm logic, addressing OEM security concerns.
Recommended
Remote Control Transmitter
The PIC16C57T-HS/SO encodes IR/RF remote commands by toggling its I/O pins at 38kHz carrier frequency under timer interrupt, using 3KB OTP for command libraries. Sleep current under 4uA extends battery life for years, and the small 28-SOIC footprint fits inside handheld enclosures. Code protection bits prevent cloning of proprietary remote protocols.
Recommended
Industrial Sensor Hub
The PIC16C57T-HS/SO aggregates analog sensor data via external ADC chips over GPIO bit-banging, sending results via RS-232 from the same I/O pins. The HS 20MHz oscillator supports deterministic polling of multiple slow sensors within 10ms windows, and the wide 5V operation tolerates industrial 24V rails through regulator stages. OTP locks the calibration constants per unit, avoiding field-tampering.
Recommended
Simple Motor Speed Controller
The PIC16C57T-HS/SO generates PWM via TMR0 to drive low-side MOSFETs controlling brushed DC motor speed, with feedback from tachometer pulses on the same I/O pins. 20MHz clock allows 8-bit PWM at ~78kHz with 256 duty-cycle steps - smooth motor control for fans, pumps, and small appliances. Internal watchdog catches stalled-rotor faults safely.
Recommended
IoT Edge Sensor Node (Base-line)
The PIC16C57T-HS/SO serves as a base-line sensor node for budget-constrained IoT deployments, sampling sensors and transmitting via UART to an external Wi-Fi or LoRa module. Its 20 I/O pins handle multiple sensor types (temperature, humidity, motion), and CMOS low-power design permits solar or battery operation. OTP locks the firmware per device for IP protection in field-deployed fleets.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C57T-HS/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57-HS/SO | PIC16C57-HSI/SO | PIC16C57T-HSI/SO | PIC16C57T-10/SO | PIC16C57C-20/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (0.295") | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC 8-bit | PIC 8-bit | PIC 8-bit | PIC 8-bit | PIC 8-bit | PIC 8-bit |
| Program Memory | 3KB OTP | 3KB OTP | 3KB OTP | 3KB OTP | 3KB OTP | 3KB OTP/EPROM |
| RAM | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes | 72 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| Packaging Form | Tape & Reel | Tray | Tray | Tape & Reel | Tape & Reel | Tray |
| Temperature Grade | Commercial (default, no I suffix) | Commercial | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial | Commercial |
Key Differentiators
- Lower-cost reel packaging (vs PIC16C57-HS/SO)
- Industrial temperature option via sister part (vs PIC16C57T-10/SO)
- Reprogrammable sister part available (vs PIC16C57C-20/SO)
Design Notes
OTP memory is one-time-programmable and cannot be erased. Do not use PIC16C57T-HS/SO for prototypes - use a windowed PIC16C57 in CERDIP package or the Flash-based PIC16F57 for development, then move to PIC16C57T-HS/SO for production. Programming requires a Microchip PICSTART Plus, MPLAB PM3, ICD3, or ICD4 programmer supporting the PIC16C5X family.
Decoupling is mandatory for PIC16C57T-HS/SO: place a 100nF ceramic capacitor as close as possible to VDD pin 27, plus a 10uF bulk capacitor on the supply rail. The MCLR pin (pin 4) requires an external 10k pull-up to VDD; if not used as reset, tie directly to VDD. Both VSS pins (5 and 14) and both VDD pins (27 and 28) MUST be connected for proper operation.
In HS oscillator mode at 20MHz, keep crystal/oscillator traces short (<10mm) and away from switching lines. Place the load capacitors (typically 15-33pF) close to OSC1/OSC2. If using an external clock source, drive OSC1/CLKIN with a CMOS-level clock signal and leave OSC2 floating to avoid double-driving the oscillator block.
Estimated: at 20MHz and 5V, the PIC16C57T-HS/SO draws approximately 10-15mA active. Add a 10% supply margin to the regulator (e.g. 250mA LDO for a board with multiple peripherals). For sleep-mode designs (e.g. battery-powered sensors), current drops below 4uA with WDT disabled, and the WDT can be enabled for periodic wake-up using the internal RC oscillator.
Compliance Information
RoHS/REACH status not explicitly stated in the provided web data - flagged as [DATA_NEEDED]. Microchip Technology's standard policy is RoHS compliance for SOIC-packaged parts, but this should be confirmed from the manufacturer's product page or specific datasheet declaration.
