PIC16F631T-I/SS - 8-bit 20MHz PIC MCU 1.75KB FLASH SSOP-20
MPN: PIC16F631T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.31 | $13.10 |
| 100 | $1.15 | $115.00 |
| 500 | $1.02 | $510.00 |
| 1,000 | $0.92 | $920.00 |
PIC16F631T-I/SS Overview
A PIC microcontroller is a compact microcontroller unit (MCU) built around a Harvard-architecture RISC core with separate program and data buses, widely used in embedded control applications. The PIC16F631 sits within Microchip's mid-range family, which adds interrupt handling, peripherals, and enhanced instructions to the baseline 14-bit instruction set. MCUs like the PIC16F631 are typically categorized hierarchically as: microcontroller -> embedded controller -> semiconductor IC. This family-level context helps engineers compare against competing 8-bit families such as the Atmel AVR or NXP HC08.
Key differentiating features include 11 I/O pins supporting digital and analog functions, an internal oscillator with selectable frequency options, a 10-bit A/D converter (ADC) with multiple input channels, and nanoWatt technology for ultra-low sleep current. The device supports an operating voltage range of 2.0 V to 5.5 V, two comparators, capture/compare/PWM (CCP) module, and on-chip EEPROM for non-volatile data storage - features that exceed many competing 14/20-pin MCUs in integrated peripheral count.
The PIC16F631T-I/SS uses Microchip's mid-range 14-bit instruction set with a hardware stack and single-cycle branching, providing deterministic interrupt response and predictable timing. The on-board debug support via ICD and the ICSP (In-Circuit Serial Programming) interface simplify firmware development and in-field updates without external programming hardware.
Typical applications include low-cost consumer electronics, white goods, motor control in small BLDC drivers, sensor signal conditioning, LED lighting control, remote controls, and battery-powered IoT edge nodes where nanoWatt sleep modes extend battery life. The wide 2.0V-5.5V supply range supports direct Li-ion battery operation.
When designing with this part, ensure that the MCLR pull-up and decoupling capacitors follow Microchip's recommended layout in the datasheet. Program code compatibility within the PIC16 mid-range family allows easy migration to larger or smaller pin-count variants without rewriting application firmware.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, providing an actionable reference for procurement, validation, and BOM design.
Drop-in alternatives for PIC16F631T-I/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 PIC16F631T-I/SS (same form factor and footprint) — differing in Core Architecture, Package, ADC, I/O Pins, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F631-I/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16F631T-I/SO
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →PIC16F631-I/SO
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16F631T-I/ML
✅ Drop-In✓ In Stock
$0.7 / Unit
View Datasheet →PIC16F631-E/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16F631T-E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F631T-I/SS Maximum Ratings & Electrical Characteristics
| Architecture | PIC16 mid-range 8-bit RISC (14-bit instruction set) |
| Program Memory (Flash) | 1.75 KB (1K x 14) |
| Data SRAM | 64 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Clock | 20 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V (industrial operating range) |
| I/O Pins | 11 |
| ADC | 10-bit, multiple channels |
| Comparators | 2 |
| Timers | Timer0, Timer1, Timer2 |
| CCP Module | Yes (Capture/Compare/PWM) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 20-pin SSOP (Shrink Small Outline Package) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Low-Power Mode | nanoWatt technology |
| RoHS Status | Compliant (Lead-Free) |
PIC16F631T-I/SS Pin Configuration
| Pin 1 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 2 | RA5/T1CKI — Digital I/O / Timer1 clock input |
| Pin 3 | RA4 — Digital I/O |
| Pin 4 | RA3/MCLR/VPP — Digital I/O / Master Clear reset (active low) / Programming voltage |
| Pin 5 | RC5 — Digital I/O |
| Pin 6 | RC4 — Digital I/O |
| Pin 7 | RC3 — Digital I/O |
| Pin 8 | RC2 — Digital I/O |
| Pin 9 | RC1 — Digital I/O |
| Pin 10 | RC0 — Digital I/O |
| Pin 11 | RA2 — Digital I/O |
| Pin 12 | RA1 — Digital I/O |
| Pin 13 | RA0 — Digital I/O |
| Pin 14 | VSS — Ground reference |
| Pin 15 | RB4 — Digital I/O |
| Pin 16 | RB5 — Digital I/O |
| Pin 17 | RB6/ICSPCLK — Digital I/O / ICSP clock |
| Pin 18 | RB7/ICSPDAT — Digital I/O / ICSP data |
| Pin 19 | RB0 — Digital I/O |
| Pin 20 | RB1 — Digital I/O |
Typical Applications
PIC16F631T-I/SS is suitable for 6 applications: Low-Cost Consumer Electronics Control, Sensor Signal Conditioning, LED Lighting Control, Battery-Powered IoT Edge Nodes, Small Motor Control (BLDC / Stepper), White Goods and Home Appliances.
Low-Cost Consumer Electronics Control
The PIC16F631T-I/SS is well-suited for low-cost consumer appliances and battery-powered gadgets where BOM cost matters as much as features. Its 1.75 KB Flash accommodates small state-machine firmware while the 10-bit ADC and two analog comparators allow direct sensor interfacing without external signal conditioning. Operating from 2.0 V to 5.5 V supports direct Li-ion or 2x AA battery connection. nanoWatt technology cuts sleep current below 1 uA, making it ideal for always-on remote controls, small appliances, and toys.
Recommended
Sensor Signal Conditioning
Use the PIC16F631T-I/SS as a dedicated analog front-end controller for thermistor, photodiode, or strain-gauge sensor modules. Its on-chip 10-bit ADC, two comparators, and CCP module support waveform capture and PWM excitation of sensors. The 128-byte EEPROM is ideal for storing per-unit calibration coefficients. Industrial -40C to +85C operation allows deployment in unheated enclosures and outdoor IoT sensor nodes.
Recommended
LED Lighting Control
The PIC16F631T-I/SS drives LED arrays via its CCP PWM module, with 10-bit resolution enabling smooth dimming and color-mixing transitions. The wide 2.0-5.5 V supply accepts 3.3 V or 5 V LED driver rails, and nanoWatt sleep modes support always-on standby with sub-uA quiescent draw. Engineered into RGB strips, downlights, and architectural fixtures where small BOM and integrated analog/digital peripherals replace external timer ICs.
Recommended
Battery-Powered IoT Edge Nodes
The PIC16F631T-I/SS powers remote wireless sensor endpoints where sleep current dominates battery life. Its nanoWatt technology reduces quiescent current below 1 uA in sleep, while periodic wake-up via WDT or interrupts drives ADC sampling and short RF bursts. Direct Li-ion or 2x AA operation (2.0-5.5 V) eliminates boost converters. The 128-byte EEPROM retains configuration and network credentials across power cycles.
Recommended
Small Motor Control (BLDC / Stepper)
Leverage the PIC16F631T-I/SS as a low-cost stepper or small BLDC motor controller in fans, pumps, and valve actuators. The CCP module generates step/direction signals, while the two on-chip comparators implement back-EMF sensing for sensorless BLDC commutation. The 20 MHz clock supports smooth commutation at moderate RPMs. Industrial -40C to +85C range allows under-hood automotive aftermarket or HVAC actuator deployment.
Recommended
White Goods and Home Appliances
The PIC16F631T-I/SS integrates control logic, user input sensing, and actuator drive in washing machines, dishwashers, microwaves, and small kitchen appliances. Industrial temperature grade (-40C to +85C) handles the heat of enclosed appliance cabinets. Its 11 I/O pins drive keypads, LEDs, relays, and triac interfaces, while the ADC reads temperature and humidity sensors. Combined with EEPROM-backed user settings, it provides reliable appliance control at minimal cost.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F631T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F631-I/SS | PIC16F631-E/SS | PIC16F631T-E/SS | PIC16F631T-I/SO | PIC16F631T-I/ML |
|---|---|---|---|---|---|---|
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SOIC-20 (wider body) | QFN-20 (ML) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB |
| Data SRAM | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 64 bytes |
| Data EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) |
| Packaging Carrier | Tape & Reel (T) | Tube | Tube | Tape & Reel | Tape & Reel | Tape & Reel |
| Price (qty 1, USD) | 1.45 | 1.45 | 1.65 | 1.65 | 1.45 | 1.55 |
Key Differentiators
- Tape & Reel packaging optimized for SMT production lines (vs PIC16F631-I/SS (tube))
- Industrial temperature grade covers -40C to +85C (vs Standard 'no-grade' PIC16F631 variants)
- Compact SSOP-20 footprint saves PCB area vs SOIC-20 (vs PIC16F631T-I/SO (SOIC-20))
Design Notes
Place a 0.1 uF decoupling capacitor as close as possible to VDD (pin 1) and VSS (pin 14), with a bulk 10 uF tantalum or ceramic capacitor at the supply input. For battery applications with the nanoWatt sleep mode, ensure that any unused I/O pins are configured as outputs driving low (not floating) to minimize sleep current leakage.
The SSOP-20 package has a fine 0.65 mm pitch and ~5.3 mm body width. Per Microchip's recommended footprint, use NSMD pads with a 0.4 mm pad width and 0.4 mm solder mask opening. Keep the MCLR pull-up (typically 10 kohm) within 5 mm of pin 4, and route ICSPCLK/ICSPDAT to test points accessible to the PICkit/ICD header without crossing signal lines.
Configuration word settings (oscillator, WDT, MCLR, code protect) are critical and must match the application - an incorrect configuration word is the #1 cause of 'dead' PIC16F631 boards. Brown-out reset (BOR) should remain enabled for production firmware to prevent code execution corruption during VDD dips. Never leave the MCLR pin floating - always tie through a 10 kohm resistor to VDD.
The PIC16F631T-I/SS is a low-power CMOS MCU with typical active current around 5-8 mA at 20 MHz and 5 V, giving ~25-40 mW dissipation - well within SSOP-20 thermal limits (theta-JA ~80-100 C/W on a standard 4-layer board). No special thermal management is required for typical embedded control duty cycles. In sleep mode, current drops below 1 uA so self-heating is negligible.
Compliance Information
RoHS compliant per Microchip product declaration; industrial temperature grade not AEC-Q100 qualified - for automotive applications consult Microchip's automotive-grade PIC portfolio.
