PIC16F627-04I/P - 8-Bit 4MHz 1.75KB Flash MCU | Microchip
MPN: PIC16F627-04I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.62 | $36.20 |
| 100 | $3.1 | $310.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.3 | $2,300.00 |
PIC16F627-04I/P Overview
An 8-bit microcontroller is a single-chip computer that processes data 8 bits at a time, executes one instruction per cycle from on-chip Flash memory, and integrates CPU, RAM, EEPROM, timers, I/O and serial peripherals in a single IC. The PIC16F627 belongs to the broader category of microcontrollers -> embedded controllers -> microprocessors -> semiconductors. Its RISC-like Harvard architecture separates program and data buses, allowing simultaneous instruction fetch and operand read for deterministic execution timing.
Key features of this device include 35 single-word instructions, 200 ns instruction cycle at 4 MHz, 10-bit-plus resolution PWM, a programmable Watchdog Timer with on-chip RC oscillator, in-circuit serial programming (ICSP), and code protection. The two analog comparators feed a programmable on-chip voltage reference module with input multiplexing from external pins and internal VREF, enabling mixed-signal designs without external analog components. The device supports four oscillator options: RC, LP, XT, and HS.
Typical applications include industrial control panels, sensor signal conditioning, automotive body electronics, appliance control boards, low-cost instrumentation, security system keypads, and battery-powered remote sensor nodes. The wide industrial temperature range and DIP-18 package make the PIC16F627-04I/P especially useful for prototype development, field-replaceable modules, and educational kits where breadboard-friendly through-hole form factor is preferred. Power-saving SLEEP mode, watchdog timer and brown-out reset support unattended remote installations.
When designing with the PIC16F627-04I/P, ensure the supply voltage stays within 2.0 V to 5.5 V (the -04 speed variant is rated for 4 MHz max at this voltage range) and place a 0.1 uF decoupling capacitor close to VDD. The ICSP pins (RB6/RB7) must be accessible for in-system programming and debugging, which requires either a 10 kohm pull-up on MCLR or proper isolation from driving circuitry to avoid contention during programming.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same PIC16F62X family, application examples, and practical design notes not consolidated in the manufacturer datasheet, giving procurement, design, and component engineering teams a single-source reference for evaluation, sourcing, and second-sourcing decisions.
Drop-in alternatives for PIC16F627-04I/P — 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 PIC16F627-04I/P (same form factor and footprint) — differing in Operating Temperature, Package, Timers, I/O Pins, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F627-04/P
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16F627-04E/P
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16F627A-I/P
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →PIC16F628-04I/P
✅ Drop-In✓ In Stock
$2.16 / Unit
View Datasheet →PIC16F628A-I/P
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16F627-04I/P Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit Harvard RISC |
| Program Memory (Flash) | 1.75 KB (1K x 14) |
| Data RAM | 224 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Clock | 4 MHz |
| Instruction Cycle | 200 ns @ 4 MHz |
| I/O Pins | 16 |
| Analog Comparators | 2 with programmable on-chip VREF |
| USART | 1 (AUSART) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| PWM Channels | 1 (10-bit) |
| Capture/Compare | 1 CCP module |
| Watchdog Timer | Yes (independent on-chip RC oscillator) |
| Brown-Out Reset | Yes |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 18-pin PDIP (0.300 inch) |
| Mounting Type | Through-Hole |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant (lead-free) |
PIC16F627-04I/P Pin Configuration
| Pin 1 | RA2/AN2/VREF — Digital I/O / analog input / external VREF reference |
| Pin 2 | RA3/AN3/CMP1 — Digital I/O / analog input / comparator 1 output |
| Pin 3 | RA4/AN4/T0CKI/CMP2 — Digital I/O / analog input / Timer0 clock / comparator 2 output |
| Pin 4 | RA5/MCLR/VPP — Digital I/O / Master Clear (reset, active low) / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Digital I/O / external interrupt |
| Pin 7 | RB1/RX/DT — Digital I/O / USART RX / data |
| Pin 8 | RB2/TX/CK — Digital I/O / USART TX / clock |
| Pin 9 | RB3/CCP1 — Digital I/O / Capture-Compare-PWM output |
| Pin 10 | RB4/PGM — Digital I/O / LVP programming |
| Pin 11 | RB5 — Digital I/O |
| Pin 12 | RB6/ICSPCLK — Digital I/O / ICSP clock |
| Pin 13 | RB7/ICSPDAT — Digital I/O / ICSP data |
| Pin 14 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT — Crystal oscillator output / clock out (Fosc/4) |
| Pin 16 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 17 | RA6/OSC2 — Digital I/O / alternate OSC2 |
| Pin 18 | RA7/OSC1 — Digital I/O / alternate OSC1 |
Typical Applications
PIC16F627-04I/P is suitable for 6 applications: Industrial Sensor Signal Conditioning, Appliance Control Board (Washing Machine / Dishwasher Front Panel), Automotive Body Electronics (Interior Lighting, Seat Controller), Security Keypad and Access Controller, Remote Wireless Sensor Node (Battery Powered), Educational and Hobbyist Development Platform.
Industrial Sensor Signal Conditioning
The PIC16F627-04I/P is well-suited for industrial sensor conditioning nodes because of its two on-chip analog comparators with programmable on-chip voltage reference (VREF). The 4 MHz instruction rate at 200 ns/cycle executes fast enough to multiplex 4-8 thermistor or photodiode inputs through the comparator and drive an SSR or relay output. The -40C to +85C industrial rating (note the 'I' suffix) allows deployment in factory floors and outdoor enclosures. Its 1.75 KB Flash holds a state-machine control loop, while the 224 bytes of RAM is ample for sample averaging and debounce buffers. Place a 0.1 uF decoupling cap close to VDD and use the internal oscillator to keep external BOM small.
Recommended
Appliance Control Board (Washing Machine / Dishwasher Front Panel)
The PIC16F627-04I/P serves well as the main controller on white-goods front panels, where it scans a keypad matrix on Port B, drives an LED or 7-segment display through Port A, and controls triacs for motor or valve actuation via PWM. Its 16 I/O pins fit a 4x4 keypad (8 pins) plus 7-segment + digit-enable lines without external I/O expanders. The USART module enables diagnostics over RS-232 or RS-485 to a service tool. Brown-out reset protects against power-line sag during motor inrush, and the SLEEP mode plus watchdog timer keep standby power low. Industrial temperature range supports unheated laundry-room environments.
Recommended
Automotive Body Electronics (Interior Lighting, Seat Controller)
Although the standard PIC16F627-04I/P is NOT AEC-Q100 qualified, it is widely used for non-safety automotive interior accessories at the -04 industrial temperature rating. The internal oscillator eliminates external crystal cost, while the PWM channel dims LED map-light or foot-well lamps smoothly. The AUSART module communicates with the body controller over LIN-like single-wire protocols or to a debug PC during development. Use ICSP via RB6/RB7 for production programming and field firmware updates through the diagnostic connector. The 16 I/O pins cover a 6-button cluster plus LED matrix without external mux.
Recommended
Security Keypad and Access Controller
The PIC16F627-04I/P is ideal for low-cost security keypads and access-control modules that need to scan a 12-key matrix, drive a buzzer and status LED, and drive a relay coil or MOSFET for electronic-lock release. The two analog comparators with programmable VREF can be repurposed as a tamper-detection input (e.g., a metal-sense loop around the keypad), saving an external analog IC. The 1.75 KB Flash stores user codes and the EEPROM (128 bytes) stores non-volatile configuration such as master code and lockout timers. The USART module supports Wiegand or RS-485 to a central panel.
Recommended
Remote Wireless Sensor Node (Battery Powered)
The PIC16F627-04I/P supports unattended remote sensor nodes through its SLEEP mode (< 1 uA typical) and watchdog timer that wakes the device periodically to take a sensor reading and transmit. The 4 MHz internal oscillator keeps BOM cost minimal, while the AUSART module drives an external 433 MHz or sub-GHz radio at 1200-9600 baud for low data-rate telemetry. The 1.75 KB Flash accommodates simple star-network MAC logic, and the 224 bytes of RAM is sufficient for buffering a few frames. Industrial temperature rating allows deployment in outdoor enclosures across most climates.
Recommended
Educational and Hobbyist Development Platform
The PIC16F627-04I/P through-hole PDIP-18 package is breadboard-friendly and is widely used in educational microcontroller courses and maker projects. Its 35-instruction RISC architecture is fast to learn, the 1.75 KB Flash fits typical textbook projects (LED blink, UART echo, ADC-via-comparator, I2C bit-bang), and the ICSP interface allows in-circuit programming on a solderless breadboard without removing the chip. The internal oscillator and integrated peripherals eliminate external components, allowing students to focus on firmware. Industrial temperature rating means kits can be used year-round in classroom environments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F627-04I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627-04/P | PIC16F627-04E/P | PIC16F627A-I/P | PIC16F628-04I/P | PIC16F628A-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-18 | PDIP-18 (same) | PDIP-18 (same) | PDIP-18 (same) | PDIP-18 (same) | PDIP-18 (same) |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 3.5 KB (+100%) | 3.5 KB (+100%) |
| Data RAM | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes |
| Data EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes (data) + 4K (program EEPROM) |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 20 MHz (-04 speed grade at industrial temp) | 4 MHz | 20 MHz (-04 speed grade at industrial temp) |
| Operating Temperature | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Silicon Revision | Original (F627 base) | Original (same) | Original (same) | A revision (improved) | Original F628 base | A revision (improved) |
| Analog Comparators | 2 with VREF | 2 with VREF | 2 with VREF | 2 with VREF | 2 with VREF | 2 with VREF |
| Unit Price (qty 100) | USD 3.10 | USD ~3.10 (same die) | USD ~3.50 (extended temp premium) | USD ~3.20 (improved silicon) | USD ~3.40 (double Flash) | USD ~3.50 (recommended upgrade) |
Key Differentiators
- Integrated analog comparator with programmable VREF (vs PIC16F628A-I/P)
- Original silicon price advantage over 'A' revision (vs PIC16F627A-I/P)
- Industrial temperature rating -40C to +85C at lowest cost (vs PIC16F627-04E/P)
- True PIC16F627-family drop-in with same Flash density (vs PIC16F628-04I/P)
Design Notes
Estimated power dissipation for the PIC16F627-04I/P at 4 MHz, 5 V VDD with all peripherals disabled is approximately 2.5 mA active and < 1 uA SLEEP. Place a 0.1 uF ceramic decoupling capacitor within 5 mm of VDD pin 14, and add a bulk 10 uF tantalum or aluminum cap if VDD traces exceed 50 mm. The internal brown-out reset triggers below 4.5 V (BOR enabled), preventing code corruption during supply sag.
Keep the MCLR/VPP pin pulled-up to VDD through a 10 kohm resistor (not directly tied) so the ICSP programmer can pull it to 13 V for programming. Add a Schottky diode (BAT54) from MCLR to VDD to clamp programming-voltage transients. Place the 0.1 uF decoupling cap close to VDD and avoid routing high-current traces under the IC to prevent injection of switching noise into the analog comparators.
Critical pitfalls to avoid: (1) Forget to configure the ANSEL/CMCON registers - analog comparator pins default to analog mode and digital reads return 0; (2) Use USART without setting SPBRG according to the Fosc table - miscalculated baud rates yield garbage; (3) Try to operate above 4 MHz at VDD < 4.5 V - the -04 speed grade is rated 4 MHz max; (4) Leave the watchdog timer enabled during long delays - WDT will reset the device if not periodically cleared.
For designs using the analog comparators, keep the comparator inputs (RA0-RA3) short and guarded by a ground trace to reduce digital switching noise coupling. Avoid routing PWM signals (RB3/CCP1) adjacent to comparator inputs. The USART pins RB1/RB2 should have series 100 ohm resistors when driving off-board to damp reflections. Place the ICSP header (5-pin standard: MCLR, VDD, VSS, ICSPCLK, ICSPDAT) on the board edge for production programming.
Compliance Information
RoHS compliant per Microchip product page (lead-free marking on package). Industrial temperature grade -40C to +85C; not AEC-Q100 qualified. PIC16F627A-I/P or PIC16F628A-I/P recommended for automotive-adjacent designs.
