PIC16F627-04/SS - 4MHz 8-bit Flash MCU 1.75KB | Microchip
MPN: PIC16F627-04/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.53 | $2.53 |
| 10 | $2.27 | $22.70 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.45 | $1,450.00 |
PIC16F627-04/SS Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals onto a single die. The PIC16F62X family uses a Harvard RISC architecture with separate program and data buses, 35 single-word instructions, and a 200ns instruction execution time, which enables deterministic real-time control in cost-sensitive embedded applications. The PIC16F627 sits in the low-tier of this family and is widely used as a stepping stone between simple 10/12F devices and larger PIC16F87X controllers.
Key features of the PIC16F627-04/SS include: 4MHz maximum clock (the "-04" suffix denotes the 4MHz speed grade), 16 I/O pins with individual direction control, high-current sink/source capable of directly driving LEDs, brown-out reset (BOR) and power-on reset (POR), an analog comparator module with programmable voltage reference, and one 10-bit PWM output. The device operates over the commercial 0°C to +70°C range (industrial -40°C to +85°C variants use the "-I" suffix).
The PIC16F62X architecture uses a 14-bit instruction word with a two-stage pipeline, a hardware stack of 8 levels, and 16 special-function hardware registers. The integrated USART supports RS-232/RS-485 asynchronous communication up to the Fosc/16 bit rate, while the CCP module can operate in Capture, Compare, or 10-bit PWM mode. The on-chip 4MHz internal oscillator (with software-selectable frequencies from 31kHz to 4MHz via the OSCCAL register) eliminates the need for an external crystal in many cost-sensitive applications.
Typical applications include consumer appliance control, LED lighting controllers, small motor control, remote controls, security sensor interfaces, and low-end industrial control. The PIC16F627's small footprint, low cost, and integrated peripherals make it well-suited for designs where a full-featured MCU would be over-spec and an 8-pin device would lack I/O.
When designing with the PIC16F627-04/SS, ensure your supply voltage is within 2.0V to 5.5V (typical 3.3V/5V operation), provide adequate decoupling at VDD/VSS, and configure the CONFIG register for the desired oscillator and reset source. The MCLR pin must be pulled high through a resistor for normal operation, and unused I/O pins should be configured as outputs low to minimize current draw.
This page synthesizes distributor pricing, drop-in same-package alternatives in the PIC16F62X family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16F627-04/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 PIC16F627-04/SS (same form factor and footprint) — differing in Operating Temperature, Package, Timers, RoHS Status, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F627-04/P
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16F627A-I/SS
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →PIC16F628-04/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F628-20/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F627-04/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Architecture | Harvard RISC (35 instructions) |
| Maximum Clock Speed | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Size | 1.75 KB (1K x 14) Flash |
| RAM Size | 224 bytes |
| EEPROM Size | 128 bytes |
| Number of I/O Pins | 16 |
| Connectivity | UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of Timers | 3 |
| Analog Comparator | Yes (with programmable VREF) |
| PWM Channels | 1 (10-bit) |
| Supply Voltage | 2.0 V to 5.5 V (3.3V/5V typical) |
| Operating Temperature | 0°C to +70°C (commercial) |
| Package | 20-SSOP (Shrink Small Outline Package) |
| Mounting Type | Surface Mount |
| Oscillator | Internal 4MHz + external crystal support |
| RoHS Status | Compliant |
PIC16F627-04/SS Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 (digital I/O or comparator input) |
| Pin 2 | RA1/AN1 — PORTA bit 1 (digital I/O or comparator input) |
| Pin 3 | RA2/AN2 — PORTA bit 2 (digital I/O or comparator input) |
| Pin 4 | RA3/AN3/C1OUT — PORTA bit 3 (digital I/O or comparator output) |
| Pin 5 | RA4/T0CKI/C2OUT — PORTA bit 4 (digital I/O, Timer0 clock, comparator2 output) |
| Pin 6 | RA5/AN4/SS/C2OUT — PORTA bit 5 (digital I/O, SSP slave select, comparator output) |
| Pin 7 | RB0/INT — PORTB bit 0 (digital I/O or external interrupt) |
| Pin 8 | RB1/RX/DT — PORTB bit 1 (digital I/O or USART RX) |
| Pin 9 | RB2/TX/CK — PORTB bit 2 (digital I/O or USART TX) |
| Pin 10 | RB3/CCP1 — PORTB bit 3 (digital I/O or CCP1 PWM/capture/compare) |
| Pin 11 | RB4/PGM — PORTB bit 4 (digital I/O or ICSP programming) |
| Pin 12 | RB5 — PORTB bit 5 (digital I/O) |
| Pin 13 | RB6/PGC — PORTB bit 6 (digital I/O or ICSP clock) |
| Pin 14 | RB7/PGD — PORTB bit 7 (digital I/O or ICSP data) |
| Pin 15 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 16 | VSS — Ground reference |
| Pin 17 | OSC2/CLKOUT — Oscillator output / Fosc/4 clock output |
| Pin 18 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 19 | RA6/OSC2 — PORTA bit 6 (or alternate oscillator output) - actually RA7, see datasheet |
| Pin 20 | RA7/OSC1 — PORTA bit 7 (digital I/O or alternate oscillator input) |
Typical Applications
PIC16F627-04/SS is suitable for 8 applications: Consumer Appliance Control, LED Lighting Controller, Remote Control and IR Transmitter, Security Sensor Interface, Small Motor Control (DC/Fan/PWM), Industrial Sensor Node / Remote Telemetry, Educational / Hobbyist Embedded Platform, Automotive Interior Accessory Control.
Consumer Appliance Control
The PIC16F627-04/SS fits cost-sensitive appliance control (rice cookers, fans, washing machine interfaces) thanks to its small SSOP-20 footprint, 1.75KB Flash, integrated USART for HMI display modules, and 16 I/O lines for keypad scanning and relay/LED drive. Its 4MHz internal oscillator eliminates the external crystal, reducing BOM cost. Brown-out reset and the integrated watchdog prevent lockup in motor-driven loads where EMI or voltage dips occur; the 4MHz cycle delivers deterministic 200ns instruction execution for time-critical PWM fan-speed loops. Pairing with the MCP23S17 I/O expander allows expansion to larger keypad-LED boards while preserving the same SSOP-20 single-chip core.
Recommended
LED Lighting Controller
The PIC16F627-04/SS is well-suited to addressable LED lighting controllers, where its 16 I/O pins can drive 4-wire LED strings directly (high-current source/sink per pin) and its on-chip 10-bit PWM module produces smooth dimming curves without external driver ICs. The internal 4MHz oscillator is accurate enough for flicker-stable fades, while the USART links the controller to upstream DMX-512 or DALI bridges. Designers benefit from the SSOP-20 surface-mount package that fits into MR-16 lamp housings with minimal PCB area. Drop-in upgrade to PIC16F627A adds an ADC for ambient light sensing in closed-loop dimming designs.
Recommended
Remote Control and IR Transmitter
For handheld IR remote controls, the PIC16F627-04/SS in SSOP-20 provides adequate Flash (1.75KB) for NEC/RC5/RC6 protocols with button debouncing and battery-low detection via the analog comparator. The integrated USART is unused but the on-chip PWM drives an IR LED at 38kHz carrier directly. With 16 I/O pins the device scans a 4x4 key matrix plus drives 3 indicator LEDs. The 2.0V minimum supply supports operation from two AAA cells. Industrial-grade drop-in upgrade PIC16F627A-I/SS handles temperature swings in outdoor applications, while keeping the same PCB and BOM for distribution-box remotes.
Recommended
Security Sensor Interface
The PIC16F627-04/SS acts as the data-concentrator MCU in PIR motion, smoke, and door-magnet sensor panels thanks to its analog comparator (threshold detection without an ADC), UART links to the alarm-panel hub, and 16 digital I/Os for zones and relays. The 4MHz speed is sufficient for streaming sensor status at 1Hz update rates with room for AES-light firmware routines. The integrated brown-out reset ensures clean sensor re-arm after power blips. Drop-in to PIC16F628-04/SS adds extra Flash to log event timestamps in larger installations, with the same SSOP-20 PCB footprint.
Recommended
Small Motor Control (DC/Fan/PWM)
For low-power DC motor and brushless-fan control, the PIC16F627-04/SS provides one 10-bit PWM channel, a 16-bit timer for commutation delays, and a hardware USART for host feedback. With 4MHz Fosc and 200ns instruction time, the device implements simple PWM start-up ramps with software state machines in 1.75KB Flash. The integrated comparator detects back-EMF zero-cross events for sensorless BLDC commutation at low RPMs; SSOP-20 packages squeeze into 25mm-diameter fan hubs. Industrial-temperature drop-in PIC16F627A-I/SS handles under-hood automotive HVAC fan designs without PCB rework.
Recommended
Industrial Sensor Node / Remote Telemetry
Industrial sensor nodes (humidity, soil moisture, factory equipment counters) benefit from the PIC16F627-04/SS’s USART for RS-485 bridges, watchdog timer for unattended field deployment, and brown-out reset for unstable bus-powered rails. The SSOP-20 small footprint fits inside IP67 enclosures. The 1.75KB Flash stores the Modbus-RTU slave firmware, and the analog comparator wakes the MCU on threshold crossings. For nodes requiring more memory or ADC channels, the drop-in PIC16F627A-I/SS provides a pin-compatible upgrade path. With the wide 2.0-5.5V supply range, the same board accepts 3.6V lithium-thiol battery or 24V industrial bus with external regulator.
Recommended
Educational / Hobbyist Embedded Platform
Beginners and educational labs favor the PIC16F627-04/SS because it packages a Harvard RISC core with USART, PWM, comparator, and timers in a breadboard-friendly SSOP-20 carrier - PIC16F62X family tools (MPLAB X IDE, XC8 compiler, PICKit programmers) are free. The 1.75KB Flash is large enough to teach assembly language and C loops while remaining small enough to require code-size awareness. A drop-in PIC16F627A-I/SS upgrade lets students add ADC lab examples later without changing the test-fixture PCB. The 4MHz internal oscillator eliminates crystal-tuning steps in introductory labs.
Recommended
Automotive Interior Accessory Control
Although the PIC16F627-04/SS commercial-grade variant itself is rated 0°C to +70°C and is not AEC-Q100 qualified, the same SSOP-20 footprint accepts the automotive-grade PIC16F627A-I/SS (industrial -40°C to +85°C) for non-critical interior accessories such as ambient lighting, cup-holder LEDs, or seat-position switches. The integrated USART links to the body-control module, and the analog comparator allows battery-voltage monitoring without an ADC. The same PCB layout thus supports both commercial and industrial temperature variants, simplifying platform rollouts across vehicle trim lines. Always validate the actual AEC-Q100 qualification status with Microchip for safety-relevant controls.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F627-04/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627-04/P | PIC16F627A-I/SS | PIC16F628-04/SS | PIC16F628-20/SS |
|---|---|---|---|---|---|
| Package | 20-SSOP | 20-PDIP (through-hole, same die) | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 1.75 KB | 1.75 KB (same) | 3.5 KB (+100%) | 3.5 KB (+100%) | 3.5 KB (+100%) |
| RAM Size | 224 B | 224 B (same) | 224 B (same) | 368 B (+64%) | 368 B (+64%) |
| Maximum Clock Speed | 4 MHz | 4 MHz (same) | 20 MHz (+400%) | 4 MHz (same) | 20 MHz (+400%) |
| ADC Module | No (analog comparator only) | No (same) | Yes, 10-bit ADC | No (analog comparator only) | No (analog comparator only) |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C (same) | -40°C to +85°C (industrial) | 0°C to +70°C (same) | 0°C to +70°C (same) |
| Number of I/O Pins | 16 | 16 (same) | 16 (same) | 16 (same) | 16 (same) |
Key Differentiators
- Wide supply voltage range with internal oscillator eliminates external crystal (vs PIC16F627A-I/SS)
- Smallest Flash in the PIC16F62X SSOP-20 family (vs PIC16F628-04/SS)
- Commercial temperature grade availability (vs PIC16F627A-I/SS)
Design Notes
Place a 0.1uF decoupling capacitor as close as possible to the VDD pin (pin 20) and a 10uF bulk capacitor on the same supply rail, with the ground return via the shortest possible trace to VSS (pin 19). For designs powered from a switching regulator, add a 10uH series ferrite bead or 10ohm resistor in the VDD trace to suppress switching noise from corrupting the analog comparator threshold. The PIC16F627-04/SS draws typical 5mA at 5V/4MHz active and ~1uA in sleep mode, so the brown-out reset and watchdog are essential for unattended battery-powered nodes.
Route the MCLR pull-up (typically 10kohm to VDD) directly to pin 4 (RA4/T0CKI/C2OUT in this family) without sharing traces with high-current outputs. When using an external crystal, place the 15-22pF load capacitors within 5mm of the OSC1/OSC2 pins and keep them over a continuous ground pour to minimize stray capacitance; for noise-sensitive designs prefer the internal 4MHz oscillator and reserve the OSC pins as digital I/O. Trace the ICSP PGC/PGD lines (RB6/RB7) directly from the SSOP-20 pads to a 6-pin header with no series resistance greater than 100 ohm, and never share those traces with relays or LEDs.
Always program the CONFIG register bits to enable the watchdog timer and disable the internal MCLR function (or route MCLR externally) before locking the code via ICSP. The PIC16F627-04/SS ships with the internal 4MHz oscillator disabled by default; if your design relies on the internal oscillator, set the FOSC configuration bits accordingly or the part will fail to start. The PIC16F627 lacks a true ADC (only analog comparator), so engineers expecting to read a potentiometer must either choose the PIC16F627A-I/SS drop-in upgrade or use an external ADC like MCP3002 over SPI. Do not exceed 5.5V VDD or latch-up may occur on the analog comparator inputs.
The SSOP-20 thermal resistance theta_JA is approximately 108 C/W for a standard 4-layer JEDEC test PCB at 0.5W. At 4MHz the device draws approximately 2-5mA active (typical 2.7mA at 5V), dissipating 13.5-27mW which is well below thermal limits. In sleep mode the 1uA quiescent produces negligible heat, so no heatsink is required in any practical configuration. Estimated: with VDD=5V, Fosc=4MHz and active current 2.7mA (typical per datasheet), power dissipation is approximately 0.014W; junction rise is therefore less than 1.5C, well within safe operation.
Compliance Information
RoHS compliant per Microchip product documentation and distributor listings. Commercial temperature grade - not AEC-Q100 qualified. REACH compliance confirmed per Microchip substance-declaration policy.
