PIC16C622-20E/SS - 8-bit CMOS MCU 3.5KB EPROM | Microchip
MPN: PIC16C622-20E/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.65 | $36.50 |
| 100 | $3.21 | $321.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.49 | $2,490.00 |
PIC16C622-20E/SS Overview
An 8-bit microcontroller (MCU) is a small, self-contained computing device integrating a CPU, program memory, RAM, and peripherals (timers, I/O, ADC) on a single silicon die. It belongs to the broader class of embedded microcontrollers, sitting beneath microprocessors in system complexity but offering higher integration and lower cost for control-oriented tasks. Microcontrollers such as the PIC16C62X series are widely deployed in appliance control, automotive subsystems, and industrial instrumentation, where deterministic instruction execution and minimal external component count are essential.
Key features of the PIC16C622-20E/SS include 35 single-cycle instructions (all single-word except branches), a 14-bit instruction word, an internal/external oscillator option, an 8-bit timer/counter with 8-bit prescaler, a watchdog timer with on-chip RC oscillator, and a power-on reset (POR). The device also integrates a comparator module and supports in-circuit serial programming (ICSP) via two pins, enabling firmware updates without removing the part from the board.
Architecturally, the PIC16C622 uses a Harvard RISC architecture with separate program and data buses, an 8-level deep hardware stack, and direct, indirect, and relative addressing modes. The 'E' suffix indicates the Extended industrial temperature grade (-40C to +125C), while the '20' indicates a 20 MHz maximum clock. The SS package (SSOP-20) is a 0.300-inch wide shrink-SOIC footprint. The device is OTP (one-time programmable) rather than flash, making it suitable for volume production where code stability is achieved.
Typical applications include automotive body controllers, appliance control boards, sensor signal conditioning, low-power remote control transmitters, and industrial actuator drivers. The wide operating temperature and dual-voltage support also make it suitable for HVAC and white-goods applications. When designing with this part, ensure the EPROM window is covered in production, use proper decoupling on VDD, and account for the OTP programming overhead by verifying code in prototype windowed packages first. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C622-20E/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 PIC16C622-20E/SS (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Instruction Set, RoHS Status, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-20/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C622T-20E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C621-20E/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16C621A-20E/SS
✅ Drop-In✓ In Stock
$4.12 / Unit
View Datasheet →PIC16C620A-20E/SS
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16C622-20E/SS Maximum Ratings & Electrical Characteristics
| Program Memory Size | 3.5 KB (2K x 14) EPROM |
| RAM Size | 128 x 8 bytes |
| Number of I/O Pins | 13 |
| Package / Case | 20-SSOP (0.295 inch, 7.50 mm width) |
| Supply Voltage | 2.5 V to 5.5 V (3.3 V / 5 V dual) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Set | 35 single-word instructions (14-bit wide) |
| Oscillator Type | External |
| Program Memory Type | OTP EPROM (one-time programmable) |
| Timer/Counters | 1 x 8-bit with 8-bit prescaler |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Operating Temperature Range | -40 C to +125 C (Extended, 'E' suffix) |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| Number of Terminals | 20 |
| Temperature Grade | Automotive |
| Data EEPROM | Not present |
| A/D Converter | Not present (PIC16C622 has comparator instead of ADC) |
PIC16C622-20E/SS Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O / analog comparator input |
| Pin 2 | RA3/AN3 — Digital I/O / analog comparator input |
| Pin 3 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP — Digital I/O / Master Clear reset / programming voltage |
| Pin 5 | VSS — Ground |
| Pin 6 | RB0/INT — Digital I/O / external interrupt |
| Pin 7 | RB1 — Digital I/O |
| Pin 8 | RB2 — Digital I/O |
| Pin 9 | RB3 — Digital I/O |
| Pin 10 | RB4 — Digital I/O |
| Pin 11 | RB5 — Digital I/O |
| Pin 12 | RB6 — Digital I/O / ICSP clock |
| Pin 13 | RB7 — Digital I/O / ICSP data |
| Pin 14 | VDD — Positive supply (2.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 17 | RC0 — Digital I/O |
| Pin 18 | RC1 — Digital I/O |
| Pin 19 | RC2 — Digital I/O |
| Pin 20 | RC3 — Digital I/O |
Typical Applications
PIC16C622-20E/SS is suitable for 6 applications: Automotive Body Electronics, Appliance Control Boards, Industrial Sensor Signal Conditioning, HVAC Fan and Damper Control, Remote Control Transmitters, Smart Sensor Nodes and IoT Edge Devices.
Automotive Body Electronics
The PIC16C622-20E/SS fits automotive body controller modules because its Extended -40C to +125C temperature grade (the 'E' suffix) and 20 MHz RISC core handle under-hood thermal stress while the 13 digital I/O and on-chip comparator manage sensor multiplexing and actuator drive. The EPROM-based code path supports locked production firmware for high-volume vehicle programs, and the SSOP-20 footprint is small enough for distributed node placement near each load. Placed on a 5 V or 3.3 V automotive bus, the part draws single-digit mA active and supports watchdog-based recovery from load-dump transients.
Recommended
Appliance Control Boards
White-goods appliances such as washing machines, dishwashers, and ovens use the PIC16C622-20E/SS as a central timing and relay-control MCU. Its 3.5 KB EPROM holds the state machine and timing tables, 128 bytes of RAM tracks cycle phase, and the on-chip 8-bit timer with prescaler generates PWM-like signals for triac phase control. The 5 V tolerance matches legacy appliance power designs, while the SSOP package fits the constrained PCB area of front-panel control boards. Estimated: at 20 MHz clock the device provides 5 MIPS, sufficient for sensor scan + display refresh + relay logic within a single instruction budget.
Recommended
Industrial Sensor Signal Conditioning
In industrial signal-conditioning front ends, the PIC16C622-20E/SS uses its integrated analog comparator to threshold sensor signals and the 13 digital I/O to drive optocouplers, relays, and indicator LEDs. The 2.5 V to 5.5 V supply range lets it share a 3.3 V regulated rail with newer sensors while still interfacing to legacy 5 V logic. The watchdog timer with on-chip RC oscillator enables autonomous recovery from brownout without external components. The 20-pin SSOP-20 footprint accommodates densely populated signal-conditioning cards in PLC backplanes.
Recommended
HVAC Fan and Damper Control
The PIC16C622-20E/SS is well matched to HVAC fan-speed and damper-actuator controllers because its 20 MHz core executes PID loops with sufficient headroom and its Extended temp range survives plenum environments. The on-chip comparator detects zero-cross on the AC line for triac triggering, while the 8-bit timer provides the timing base for PWM damper drive. The 13 I/O pins interface directly to keypads, status LEDs, and triac optos, eliminating external glue logic and reducing BOM cost. The SSOP-20 footprint suits compact wall-thermostat and air-handler PCBs.
Recommended
Remote Control Transmitters
Low-cost RF remote control transmitters use the PIC16C622-20E/SS to encode button presses and modulate an RF carrier. The RISC core's deterministic instruction timing creates accurate pulse-width modulation for OOK/FSK encoding, and the 13 digital I/O directly read a 4x4 keypad matrix without external scanning logic. The 2.5 V to 5.5 V range supports both coin-cell and 3 V lithium battery supplies. The OTP EPROM lets manufacturers secure the encoding algorithm in volume production at very low per-unit cost.
Recommended
Smart Sensor Nodes and IoT Edge Devices
Early-generation IoT edge nodes and smart sensor hubs use the PIC16C622-20E/SS as a wake-up controller that polls sensors and forwards data via a downstream radio. The 5 MIPS performance is adequate for simple filtering algorithms, and the watchdog timer keeps the node alive in unattended deployments. The on-chip comparator enables battery-voltage monitoring without an external ADC. Although the part is OTP and obsolete today, legacy installations continue to integrate it for proven long-term supply stability.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20/SS | PIC16C622T-20E/SS | PIC16C621-20E/SS | PIC16C621A-20E/SS | PIC16C620A-20E/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP (0.295 inch) | 20-SSOP (0.295 inch) - same | 20-SSOP (0.295 inch) - same | 20-SSOP (0.295 inch) - same | 20-SSOP (0.295 inch) - same | 20-SSOP (0.295 inch) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB EPROM | 3.5 KB EPROM | 3.5 KB EPROM | 3.5 KB EPROM | 3.5 KB EPROM | 0.5 KB EPROM |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 96 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Comparator | Yes (1x on-chip) | Yes (1x on-chip) | Yes (1x on-chip) | No | No | Yes (1x on-chip) |
| Operating Temperature | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) |
Key Differentiators
- On-chip analog comparator eliminates external op-amp (vs PIC16C621-20E/SS)
- Larger EPROM than PIC16C620A sibling (vs PIC16C620A-20E/SS)
- Extended -40 C to +125 C temperature grade (vs PIC16C622-20/SS)
Design Notes
Place a 0.1 uF decoupling capacitor as close as possible to the VDD pin (pin 14) and a bulk 1 uF to 10 uF capacitor on the supply rail. The PIC16C622 draws peak supply current during EPROM programming (typically 20-30 mA), so the decoupling network must source this transient without droop. For battery-powered designs, the brown-out reset circuit and watchdog timer together ensure recovery from supply collapse without external supervisor ICs.
Keep the OSC1/OSC2 traces short and surround them with a ground pour to minimize EMI radiation from the 20 MHz fundamental and harmonics. The MCLR/VPP pin (pin 4) requires a 10 kohm pull-up to VDD for normal operation and must be isolated from adjacent noisy traces during in-circuit serial programming (ICSP) to avoid programming failures. Place the ICSP connector at the board edge so the production programmer can reach the ICSPDAT and ICSPCLK pins (RB7/RB6) without disturbing the rest of the layout.
Estimated: the OTP EPROM cannot be reprogrammed - all code changes require a new physical part after prototype validation. Always develop and debug on a windowed ceramic package variant (e.g. PIC16C622-20/JW), then qualify the final code on SSOP-20 production units before committing to volume. Watchdog timer must be cleared (CLRWDT) in any long-delay loop or the MCU will reset unexpectedly. Do not leave floating inputs on port pins - configure unused I/O as outputs or enable internal weak pull-ups.
The PIC16C622-20E/SS is rated for -40 C to +125 C junction temperature; in the SSOP-20 package the thermal resistance theta_JA is approximately 100 C/W. At 25 mA active current and 5 V supply, power dissipation is around 125 mW, giving a junction temperature rise of about 12.5 C above ambient - well within the rating. In enclosed appliance environments above 70 C ambient, add thermal relief copper around the SSOP-20 land pattern to spread heat into the PCB.
Compliance Information
AEC-Q100 automotive-grade test certification is not listed; the 'Automotive' temperature grade (-40C to +125C) refers to operating range, not AEC-Q100 qualification.
