PIC16F627A-I/SS - 8-bit Flash MCU 1.75KB 224B RAM SSOP-20 | Microchip
MPN: PIC16F627A-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.65 | $16.50 |
| 100 | $1.45 | $145.00 |
| 500 | $1.28 | $640.00 |
| 1,000 | $1.12 | $1,120.00 |
PIC16F627A-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable peripherals. Within the broader taxonomy, the PIC16F627A belongs to the 8-bit microcontroller class, which sits under microcontrollers, integrated circuits, and finally semiconductors. The mid-range PIC16 core is one of the industry's most widely deployed 8-bit architectures, valued for its deterministic instruction set, low power consumption (nanoWatt technology), and rich peripheral integration for cost-sensitive embedded designs.
Key features include a hardware USART for asynchronous serial communication, one capture/compare/PWM module, two analog comparators with a programmable voltage reference, an 8-level deep hardware stack, and 16 bidirectional I/O pins capable of driving LEDs directly. The device supports in-circuit serial programming (ICSP) and in-circuit debugging, enabling firmware updates and development without removing the MCU from the board. Brown-out reset, power-on reset, and a watchdog timer provide system-level robustness for unattended or industrial deployments.
The PIC16F627A's combination of analog peripherals (comparators with programmable VREF) and digital peripherals (USART + CCP) makes it well-suited for mixed-signal embedded applications. nanoWatt technology provides multiple power-managed modes—run, idle, and sleep—reducing quiescent current to microampère ranges for battery-powered designs.
Typical applications include automotive body electronics and sensor interfaces, industrial control panels and small appliance controllers, security and alarm systems, remote controls, lighting controllers, and low-end consumer products requiring on-board analog comparison or UART communication.
When designing with the PIC16F627A-I/SS, ensure the SSOP-20 footprint uses adequate PCB copper for thermal dissipation and that the ICSP pins (RB6/RB7) are routed to a header or test pad for programming. Note that newer-generation parts such as PIC16F18444 are recommended for new designs, but the PIC16F627A remains fully active and supported for legacy systems.
Drop-in alternatives for PIC16F627A-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 PIC16F627A-I/SS (same form factor and footprint) — differing in Package, Program Memory Size, Core Architecture, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F628A-I/SS
✅ Drop-In✓ In Stock
$1.41 / Unit
View Datasheet →PIC16F648A-I/SS
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16F627-04I/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16F627-20I/P
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC16F627A-E/ML
✅ Drop-In✓ In Stock
$2.01 / Unit
View Datasheet →PIC16F627A-I/SS Maximum Ratings & Electrical Characteristics
| Program Memory Type | Flash |
| Program Memory Size | 1.75 KB (1024 x 14 words) |
| RAM Size | 224 bytes |
| Data EEPROM | 128 bytes |
| CPU | 8-bit PIC16 mid-range core |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 200 ns |
| Maximum Clock Speed | 20 MHz (5 MIPS) |
| Internal Oscillator | 4 MHz, factory calibrated ±1% |
| Supply Voltage Range | 3.0 V to 5.5 V (operating) |
| I/O Pins | 16 bidirectional |
| Hardware Stack | 8 levels deep |
| USART | 1 (asynchronous serial) |
| Capture/Compare/PWM (CCP) | 1 module |
| Analog Comparators | 2 with programmable voltage reference |
| Operating Temperature | -40 °C to +85 °C (Industrial, "I") |
| Package | SSOP-20 (5.30 mm body width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (lead-free SSOP) |
PIC16F627A-I/SS Pin Configuration
| Pin 1 | RA0/AN0 — Bidirectional I/O / Analog input 0 / Comparator input |
| Pin 2 | RA1/AN1 — Bidirectional I/O / Analog input 1 / Comparator input |
| Pin 3 | RA2/AN2/VREF — Bidirectional I/O / Analog input 2 / VREF output |
| Pin 4 | RA3/AN3/CMP1 — Bidirectional I/O / Analog input 3 / Comparator 1 output |
| Pin 5 | RA4/T0CKI/CMP2 — Bidirectional I/O / Timer 0 clock input / Comparator 2 output |
| Pin 6 | RA5/MCLR/VPP — Input only / Master Clear (reset) / Programming voltage |
| Pin 7 | RA6/OSC2/CLKOUT — Bidirectional I/O / Oscillator output / Clock out |
| Pin 8 | RA7/OSC1/CLKIN — Bidirectional I/O / Oscillator input / Clock in |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply (3.0–5.5 V) |
| Pin 11 | RB0/INT — Bidirectional I/O / External interrupt |
| Pin 12 | RB1/RX/DT — Bidirectional I/O / USART RX / Synchronous data |
| Pin 13 | RB2/TX/CK — Bidirectional I/O / USART TX / Synchronous clock |
| Pin 14 | RB3/CCP1 — Bidirectional I/O / Capture/Compare/PWM 1 |
| Pin 15 | RB4 — Bidirectional I/O / Interrupt-on-change |
| Pin 16 | RB5 — Bidirectional I/O / Interrupt-on-change |
| Pin 17 | RB6/ICSPCLK — Bidirectional I/O / ICSP clock / Interrupt-on-change |
| Pin 18 | RB7/ICSPDAT — Bidirectional I/O / ICSP data / Interrupt-on-change |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (3.0–5.5 V) |
Typical Applications
PIC16F627A-I/SS is suitable for 6 applications: Automotive Body Electronics, Industrial Control Panels, Appliance Controllers, Security and Alarm Systems, Lighting Controllers and Dimmers, Remote Control Transmitters.
Automotive Body Electronics
The PIC16F627A-I/SS fits automotive body-electronics modules such as central locking, mirror control, and lighting drivers because its 3.0–5.5 V supply tolerates automotive 12 V battery transients after regulation, and its industrial -40 °C to +85 °C temperature grade covers cabin and under-hood-near locations. The integrated hardware USART allows reliable LIN-bus or K-line communication with body controllers, while the two analog comparators with programmable VREF support current sensing and window-detection circuits without external op-amps. The 16 I/O pins drive relays, LEDs, and H-bridge enable lines directly, reducing BOM cost versus larger MCUs. For new automotive designs Microchip recommends PIC16F18444, but for legacy platforms the PIC16F627A-I/SS remains production-supported and qualified.
Recommended
Industrial Control Panels
In industrial control panels for conveyor segments, pump controllers, and small PLCs, the PIC16F627A-I/SS delivers 5 MIPS deterministic execution with only 35 instructions, simplifying firmware qualification. The capture/compare/PWM module drives triac-fired heater elements or DC motor speed commands, while the USART provides RS-232/RS-485 communication with supervisory PLCs. Brown-out reset and watchdog timer protect against supply sag and firmware lockup in unattended factory installations. The SSOP-20 footprint occupies less than 35 mm² of PCB area, enabling compact DIN-rail-mounted designs. nanoWatt idle and sleep modes cut quiescent current to microampères, suiting battery-backed alarm and remote monitoring nodes.
Recommended
Appliance Controllers
Small and large home appliances such as coffee machines, microwave ovens, washing machines, and dishwasher control boards benefit from the PIC16F627A-I/SS's combination of analog comparators for temperature sensing and a CCP module for PWM-driven loads like valves and pumps. The integrated 4 MHz internal oscillator eliminates external crystals, reducing BOM cost and assembly time. Hardware USART interfaces with HMI displays or wireless modules for smart-appliance connectivity. Industrial temperature range supports refrigerator compartment electronics. The 1.75 KB flash accommodates state-machine control logic with EEPROM-backed user settings such as wash cycles and brew preferences.
Recommended
Security and Alarm Systems
PIR motion detectors, glass-break sensors, and alarm panel keypads leverage the PIC16F627A-I/SS's two analog comparators with programmable VREF for window-detection of sensor outputs, simplifying the analog front end. nanoWatt sleep currents below 1 µA extend battery life in wireless PIR detectors to multi-year operation on a single CR123A cell. The USART connects to RF transceivers or GSM modules for alarm reporting. ICSP on RB6/RB7 allows field firmware updates via programming header. The 128-byte EEPROM stores zone configuration, device IDs, and tamper flags across power cycles without external memory.
Recommended
Lighting Controllers and Dimmers
LED dimmers, RGB controllers, and architectural lighting systems use the PIC16F627A-I/SS to generate phase-controlled or PWM dimming signals via its CCP module, while the two analog comparators detect zero-crossings of the AC mains for triac firing. The wide 3.0–5.5 V supply range supports both 5 V and 3.3 V LED driver topologies. Hardware USART interfaces with DMX-512 or proprietary lighting protocols via external transceivers. The 16 I/O pins can drive multiple LED channels and key-scanning matrices without external logic. Brown-out reset ensures clean dimming ramp restoration after power events.
Recommended
Remote Control Transmitters
TV, set-top box, and consumer electronics remote controls employ the PIC16F627A-I/SS to scan keypads, encode IR or RF protocols via the CCP module, and enter nanoWatt sleep between button presses for multi-year battery life. The internal 4 MHz oscillator eliminates the external resonator typically required by IR carrier generation, reducing BOM and assembly cost. The USART can drive RF transceivers for 2.4 GHz remote applications when paired with an MRF24J40 or similar module. EEPROM stores learned-device codes and customer preferences across battery replacements. SSOP-20 supports slim-line remote housing designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F627A-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F628A-I/SS | PIC16F648A-I/SS | PIC16F627-04I/SS | PIC16F627-20I/P | PIC16F627A-E/ML |
|---|---|---|---|---|---|---|
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | DIP-18 - different | QFN-28 (ML) - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB flash | 2 KB flash | 4 KB flash | 1.75 KB flash | 1.75 KB flash | 1.75 KB flash |
| RAM | 224 bytes | 256 bytes | 256 bytes | 224 bytes | 224 bytes | 224 bytes |
| Data EEPROM | 128 bytes | 128 bytes | 256 bytes | 128 bytes | 128 bytes | 128 bytes |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 3.0–5.5 V | 3.0–5.5 V | 3.0–5.5 V | 3.0–5.5 V | 3.0–5.5 V | 3.0–5.5 V |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 |
| Temperature Range | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (Extended) |
Key Differentiators
- A-silicon revision with enhanced flash endurance and ICD support (vs PIC16F627-04I/SS)
- More flash memory headroom at the same price tier (vs PIC16F628A-I/SS)
- Cost-optimized SSOP-20 footprint for space-constrained designs (vs PIC16F627-20I/P (DIP-18))
Design Notes
The PIC16F627A-I/SS operates from 3.0 V to 5.5 V and supports nanoWatt idle and sleep modes with quiescent current below 1 µA. For battery-powered applications, route the MCLR pin through a 10 kΩ pull-up to VDD and add a 100 nF decoupling capacitor as close as possible to the VDD pins (pin 10 and pin 20). The two VDD pins must both be connected; leaving one floating can cause erratic behavior or reset during RF events. Brown-out reset is configurable via configuration fuses and is recommended for all designs subject to slow-rising or sagging supplies.
The SSOP-20 package has a 0.65 mm pitch and requires careful PCB layout. Use a copper land pattern with at least 0.4 mm annular ring and 0.5 mm pad length per IPC-7351 nominal. Place decoupling capacitors within 2 mm of the VDD pins to minimize supply inductance. Route the ICSP clock and data pins (RB6/RB7) to a 0.1" header or test pads so that in-circuit serial programming works without removing the MCU from the board. The exposed lead frames on the SSOP-20 underside act as additional thermal paths—tie them to the ground plane with multiple vias for improved heat dissipation in high-I/O-drive applications.
Common pitfalls when designing with the PIC16F627A-I/SS include: (1) confusing the MCLR/RA5 pin—MCLR must be tied to VDD through a pull-up for normal operation and must not be left floating; (2) exceeding the 25 mA sink/source rating on any single I/O pin when driving LEDs directly—use a current-limit resistor; (3) forgetting that the internal 4 MHz oscillator is calibrated for 5 V and drifts slightly at 3.3 V—use the LF (low-frequency) configuration bit or an external crystal if UART accuracy matters at 3.3 V; (4) failing to disable the watchdog timer in software or to clear it periodically—unattended firmware hangs will trigger a reset; (5) using PIC16F627 (non-A) firmware on a PIC16F627A without verifying register compatibility.
Compliance Information
RoHS-compliant lead-free SSOP-20 package per Microchip product page. AEC-Q100 not qualified—PIC16F627A-I/SS targets industrial, appliance, and consumer markets; for AEC-Q100 automotive applications use PIC16F18444 or PIC16F88. Conflict-minerals compliance confirmed through Microchip's standard CMRT filings.
