PIC16F627AT-I/SS - 8-Bit 20MHz 1.75KB Flash MCU | Microchip | SSOP-20
MPN: PIC16F627AT-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.36 | $236.00 |
| 500 | $2.07 | $1,035.00 |
| 1,000 | $1.77 | $1,770.00 |
PIC16F627AT-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and programmable I/O peripherals. The PIC16 mid-range family occupies the middle of Microchip's 8-bit PIC portfolio - simpler than PIC24/dsPIC but more capable than PIC10/12 baseline devices, and is widely used in cost-sensitive embedded control. The PIC16F627A/AT family introduced nanoWatt Technology, providing multiple low-power modes (sleep, watchdog timer-based wake, internal RC oscillator) that drop supply current into the microamp range during idle intervals.
Key features include an integrated 4MHz internal RC oscillator (eliminating external crystals for low-cost designs), a hardware USART for serial communications, a capture/compare/PWM module, two analog comparators with programmable references, and 128 bytes of EEPROM for non-volatile user data storage. The 35 single-word instruction RISC core enables code density comparable to larger 8-bit MCUs while fitting in the 1.75KB Flash budget.
Architecturally, the PIC16F627A uses a 14-bit instruction word, Harvard architecture with separate program and data buses, and a 16-level hardware stack. The 'A' silicon revision adds the USART module and enhanced comparators versus the original PIC16F627. The 'T' suffix in PIC16F627AT indicates Tape and Reel packaging for high-volume assembly, while the 'I' indicates the industrial -40C to +85C operating temperature range.
Typical applications include low-cost consumer appliances, automotive body electronics, security and alarm systems, remote controls, lighting ballasts, motor control auxiliary logic, and small-format sensor interface boards. The wide SSOP-20 footprint allows hand-soldering and prototyping alongside high-volume SMD assembly.
When designing with this part, engineers should note that the PIC16F627A has been superseded by the PIC16F18444 in many new designs - identical pinout but more memory and peripherals. For new designs, the PIC16F18444-I/SS is recommended unless legacy code compatibility dictates the original 627A/AT. The internal oscillator eliminates two external pins but trades absolute frequency accuracy against BOM cost.
This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16F628A/648A family, and practical design considerations not aggregated in a single datasheet view.
Drop-in alternatives for PIC16F627AT-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 PIC16F627AT-I/SS (same form factor and footprint) — differing in Package, Operating Temperature, Internal Oscillator, Timers, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F627A-I/SS
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →PIC16F627AT-I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.83 / Unit
View Datasheet →PIC16F627AT-E/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.18 / Unit
View Datasheet →PIC16F627-20I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.18 / Unit
View Datasheet →PIC16F627-20E/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.65 / Unit
View Datasheet →PIC16F627AT-I/SS Maximum Ratings & Electrical Characteristics
| Product Family | PIC16 (mid-range 8-bit) |
| Core | PIC RISC (14-bit instruction word) |
| CPU Architecture | 8-bit Harvard |
| Instruction Set | 35 single-word instructions |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Flash Program Memory | 1.75 KB (1K x 14) |
| SRAM Data Memory | 224 bytes |
| EEPROM Data Memory | 128 bytes |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Pins | 16 |
| Internal Oscillator | 4 MHz (factory calibrated) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 20-pin SSOP (5.30 mm body, lead-free) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| On-chip Peripherals | USART, CCP, 2x analog comparator |
PIC16F627AT-I/SS Pin Configuration
| Pin 1 | RA2/AN2/CVREF — GPIO RA2 / analog input 2 / comparator reference output |
| Pin 2 | RA3/AN3/C1OUT — GPIO RA3 / analog input 3 / comparator 1 output |
| Pin 3 | RA4/T0CKI — GPIO RA4 / Timer0 clock input (open-drain) |
| Pin 4 | RA5/MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — GPIO RB0 / external interrupt input |
| Pin 7 | RB1/RX/DT — GPIO RB1 / USART RX / data line |
| Pin 8 | RB2/TX/CK — GPIO RB2 / USART TX / clock line |
| Pin 9 | RB3/CCP1 — GPIO RB3 / CCP1 PWM/capture/compare |
| Pin 10 | RB4/PGM — GPIO RB4 / LVP programming input |
| Pin 11 | RB5 — GPIO RB5 |
| Pin 12 | RB6/PGC — GPIO RB6 / ICSP clock |
| Pin 13 | RB7/PGD — GPIO RB7 / ICSP data |
| Pin 14 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT/RA6 — Crystal output / CLKOUT / GPIO RA6 |
| Pin 16 | OSC1/CLKIN/RA7 — Crystal input / CLKIN / GPIO RA7 |
| Pin 17 | RA0/AN0 — GPIO RA0 / analog input 0 |
| Pin 18 | RA1/AN1 — GPIO RA1 / analog input 1 |
| Pin 19 | RA2 (alternate) — Not connected - duplicates pin 1; refer to pin 1 description |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
PIC16F627AT-I/SS is suitable for 6 applications: Consumer Appliance Controllers, Automotive Body Electronics, Security and Alarm Panels, IR Remote Control Transmitters, Lighting Ballast Control Logic, Sensor Interface Boards.
Consumer Appliance Controllers
The PIC16F627AT-I/SS suits low-cost consumer appliance controllers where 16 I/O pins, 1.75 KB Flash and the integrated 4 MHz oscillator are sufficient. Its 224-byte SRAM and 128-byte EEPROM store run-time state and user preferences (timer settings, mode selections), while the 20 MHz CPU executes control loops in well under 1 ms. With industrial -40 C to +85 C operation and a robust SSOP-20 footprint, it survives the vibration and temperature swings of washing-machine, microwave-oven and small-kitchen-appliance PCB environments. The PIC RISC core's deterministic 200 ns instruction cycle simplifies real-time control of relays and TRIACs without an RTOS.
Recommended
Automotive Body Electronics
The PIC16F627AT-I/SS is widely deployed in automotive body-electronics modules such as door-lock controllers, seat-position memory and lighting timers, where its industrial temperature range (-40 C to +85 C) matches cabin electronics requirements. The integrated USART interfaces with LIN/CAN transceiver ICs for body-network communication, while the hardware CCP module generates PWM for LED-dimming and motor-speed control. EEPROM retention of 40 years plus 1 million write cycles makes it suitable for storing odometer-style tamper-resistant data, and the SSOP-20 package withstands automotive vibration profiles when paired with underfilled solder joints. For harsher under-hood environments, designers should migrate to AEC-Q100-qualified PIC16F18444 variants.
Recommended
Security and Alarm Panels
Security alarm panels benefit from the PIC16F627AT-I/SS's low-power nanoWatt sleep modes (sub-microamp standby) for battery-backed operation during AC mains loss, paired with its 16 I/O pins to read multiple zones (PIR motion, door/window contacts, glass-break detectors) and drive sirens and keypads. The integrated analog comparators directly sense low-battery conditions without an external ADC, while 128 bytes of EEPROM retain event logs and user arm/disarm codes across power cycles. The 5.5 V absolute-maximum tolerance protects the MCU against field-wiring transients that bypass protection TVS diodes. SSOP-20 enables compact panel enclosures where board height must stay below 10 mm.
Recommended
IR Remote Control Transmitters
Battery-powered IR remote controls rely on the PIC16F627AT-I/SS for low-cost RC5/SIRC/ NEC protocol generation, where the integrated 4 MHz oscillator (with optional prescaler to 38 kHz carrier) eliminates the external crystal typical of older remote designs. nanoWatt sleep currents below 1 uA extend coin-cell battery life to multi-year horizons, and the hardware CCP module produces accurate 38 kHz / 40 kHz / 56 kHz carrier frequencies directly from the timer, freeing the CPU for key-scanning and protocol encoding. SSOP-20 hand-solders for prototyping and high-pincount keypads (4x4 or 5x5 matrices) fit comfortably within the 16 I/O budget after reserving one pin for the IR LED driver.
Recommended
Lighting Ballast Control Logic
Fluorescent and HID ballast control logic commonly uses the PIC16F627AT-I/SS for digital lamp-startup sequencing, dimming curve generation and fault monitoring - tasks that require deterministic 200 ns instruction timing but modest memory (1.75 KB Flash holds the entire dimming profile and fault handler). The analog comparators directly sense ballast current/voltage without a discrete ADC, while the hardware CCP module generates variable-frequency PWM to drive the half-bridge or push-pull power stage. The 4.5 V to 5.5 V supply aligns with the auxiliary 5 V rail typical of electronic-ballast designs, and SSOP-20 thermal performance supports continuous operation at full ballast ambient temperatures up to 85 C.
Recommended
Sensor Interface Boards
Small-form-factor sensor-interface boards for industrial measurement, building automation or HVAC use the PIC16F627AT-I/SS as a low-cost signal-conditioning and protocol-bridging controller. The USART produces Modbus RTU or proprietary serial output for upstream PLCs, while the two analog comparators with programmable voltage references implement window-detect or threshold-switch logic for analog sensor signals (temperature, pressure, level). The 16 I/O pins accept multiple discrete sensors (limit switches, optical flags) plus an I2C/SPI master interface for digital sensors; 128-byte EEPROM stores calibration constants across factory programming. SSOP-20 enables compact PCBAs inside sensor housings where height is constrained.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F627AT-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627A-I/SS | PIC16F627AT-I/SO | PIC16F627AT-E/SO | PIC16F627-20I/P | PIC16F627-20E/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP (same) | 20-pin SOIC | 20-pin SOIC | 20-pin DIP | 20-pin SSOP (same) |
| CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB |
| SRAM | 224 B | 224 B | 224 B | 224 B | 224 B | 224 B |
| EEPROM | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B |
| Temperature Grade | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +125C (extended) | -40C to +85C | -40C to +125C (extended) |
| Shipping Carrier | Tape & Reel (1600 pcs) | Tube / Tray | Tape & Reel | Tape & Reel | Tube | Tube |
Key Differentiators
- Same SSOP-20 footprint with tray shipping alternative (vs PIC16F627A-I/SS)
- SOIC-20 wider-pin footprint simplifies hand-soldering (vs PIC16F627AT-I/SO)
- Extended -40 C to +125 C grade for harsher environments (vs PIC16F627AT-E/SO)
Design Notes
Estimated: at 20 MHz CPU clock and 5.0 V supply, the PIC16F627AT-I/SS draws approximately 4 mA active and <1 uA in sleep mode. Place a 100 nF decoupling capacitor as close as possible to pin 14 (VDD) and pin 5 (VSS) to suppress switching transients; an additional 10 uF bulk capacitor on the supply rail improves voltage stability during USART-burst transmit events. The internal 4 MHz oscillator saves the BOM cost of two crystal-load capacitors.
The SSOP-20 footprint is 5.30 mm body width with 0.65 mm pitch - keep-out pads must be designed per IPC-7351 nominal and maximum land patterns. According to Microchip SSOP package drawing, hand-soldering requires a fine-tip iron (0.5 mm chisel) and flux-pen to prevent pin-bridges, especially for pin 4 (MCLR/VPP) and pins 6-13 (PORTB) which carry high-speed digital signals. Route the crystal traces (OSC1/OSC2) on the top layer with a guard ground to avoid injecting digital switching noise into the oscillator.
The PIC16F627AT-I/SS shares its configuration bits with later PIC16 family members; do NOT blindly apply PIC16F88 configuration templates - the 627A lacks an ADC and will ignore TRISA analog-mode bits. Brown-out-reset voltage thresholds must be configured explicitly (BOREN=ON, BORV=4.5V) for industrial 5 V designs, otherwise slow-rising supplies may cause undefined reset behavior. Pin 4 (MCLR) requires a 10 kohm pull-up to VDD for normal operation; tying it directly to VDD without the pull-up can cause ICSP programming failures on production boards.
Compliance Information
RoHS compliant and lead-free per Microchip product page. AEC-Q100 qualification is NOT available for PIC16F627AT-I/SS; for AEC-Q100 qualified Microchip PIC16 alternatives, choose PIC16F18444 or PIC16F88 family variants.
