PIC16C622A-20E/SS - 3.5KB OTP 8-Bit MCU 20MHz | Microchip
MPN: PIC16C622A-20E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.74 | $2.74 |
| 10 | $2.47 | $24.70 |
| 100 | $2.19 | $219.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.65 | $1,650.00 |
PIC16C622A-20E/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. OTP microcontrollers ship with one-time-programmable EPROM for code storage and are intended for low-to-medium volume production or evaluation where re-programmability is not required. Within the broader semiconductor hierarchy, MCUs sit under microcontrollers, embedded processors, and semiconductors, and serve as the compute core for billions of low-power edge and consumer devices. The PIC16C622A is part of Microchip's mid-range PIC16C family, originally introduced in the 1990s and still used for long-lifecycle industrial and legacy designs.
Key features include a RISC architecture with 35 single-cycle instructions, an internal oscillator option, two analog comparators with programmable reference, a watchdog timer, and power-on reset. The PIC16C622A delivers deterministic single-cycle instruction execution and Harvard architecture separation of program and data buses for predictable interrupt latency, which simplifies real-time control firmware.
Technical depth: the PIC16C622A uses a Harvard architecture with separate 14-bit program and 8-bit data paths, supported by a 2-level hardware stack and 8-level deep software stack. The integrated comparators can be configured for analog signal conditioning, while the 13 I/O pins source or sink up to 25 mA per pin, enabling direct LED drive without external transistors.
Typical applications include industrial control, appliance control, security and access panels, simple sensor interfaces, and automotive body electronics where extended-temperature operation is required.
Design tip: because the PIC16C622A is OTP and not re-programmable in-circuit, plan your firmware revision strategy carefully. Use a windowed (JW) or Flash-based PIC16F variant during development and migrate to PIC16C622A only for locked production firmware.
This page synthesizes real distributor pricing, drop-in alternatives, and practical design notes for the PIC16C622A-20E/SS not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C622A-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 PIC16C622A-20E/SS (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, RoHS Status, Instruction Set.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-20E/SS
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C620A-20E/SS
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16C621A-20E/SS
✅ Drop-In✓ In Stock
$4.12 / Unit
View Datasheet →PIC16C622-20/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C622A-20E/P
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16C622A-20E/SS Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC16C RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM | 128 bytes |
| I/O Pins | 13 |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | -40C to +125C (Industrial, E grade) |
| Package | 20-pin SSOP (0.209", 5.30 mm width) |
| Architecture | Harvard, 14-bit instruction word |
| Instruction Set | 35 single-cycle instructions |
| Stack | 2-level hardware, 8-level software |
| Analog Comparators | 2 (with programmable voltage reference) |
| Watchdog Timer | Yes |
| Power-On Reset | Yes |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited floor life) |
PIC16C622A-20E/SS Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2; analog comparator input |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3; analog comparator input / MCLR alternative |
| Pin 3 | RA4 — Bidirectional I/O port A bit 4; open-drain when configured as output |
| Pin 4 | MCLR — Master Clear reset input, active low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0; external interrupt capable |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage, 2.5 V to 5.5 V |
| Pin 15 | RC0 — Bidirectional I/O port C bit 0 |
| Pin 16 | RC1 — Bidirectional I/O port C bit 1 |
| Pin 17 | RC2 — Bidirectional I/O port C bit 2 |
| Pin 18 | RC3 — Bidirectional I/O port C bit 3 |
| Pin 19 | RC4 — Bidirectional I/O port C bit 4 |
| Pin 20 | RA0 — Bidirectional I/O port A bit 0; analog comparator input |
Typical Applications
PIC16C622A-20E/SS is suitable for 7 applications: Industrial Control Logic, Appliance Control Panels, Security and Access Panels, Simple Sensor Interfaces, Automotive Body Electronics, Hobby and Educational Embedded Projects, Power Supply Auxiliary Controllers.
Industrial Control Logic
The PIC16C622A-20E/SS fits industrial control logic boards requiring deterministic single-cycle instruction execution at 20 MHz and -40C to +125C operation. Its 3.5 KB OTP holds state-machine firmware for relay drivers, contactor sequencing, and simple PLC replacement. Place the MCU near the I/O header with 0.1 uF ceramic bypass on VDD; the 13 I/O pins source/sink 25 mA directly, eliminating driver transistors. Compared with Flash MCUs, the OTP architecture prevents accidental firmware overwrite in noisy factory environments.
Recommended
Appliance Control Panels
White-goods appliance control (washing machines, dishwashers, microwave ovens) commonly use the PIC16C622A-20E/SS for its cost-effective OTP and proven 25-year Microchip supply. The 20 MHz clock drives multiplexed 7-segment LED displays via the 13 I/O pins at 25 mA per pin, while the dual analog comparators read thermistor or water-level sensors without an external ADC. Power the MCU from a 5 V rail with a 100 nF decoupling cap adjacent to VDD.
Recommended
Security and Access Panels
Security alarm keypads, RFID access readers, and magnetic-door controllers use the PIC16C622A-20E/SS for fixed-code firmware that resists in-the-field tampering. The OTP memory ensures the locked firmware cannot be extracted or rewritten by attackers. The 20 MHz core handles keypad scanning debounce and Wiegand protocol parsing within 3.5 KB, while the 128 byte RAM buffers tag IDs. Operate the part at 5 V from a battery-backed supply; the integrated POR and WDT prevent lockup during brownouts.
Recommended
Simple Sensor Interfaces
Battery-powered sensor nodes with no wireless link use the PIC16C622A-20E/SS for analog signal conditioning via the dual on-chip comparators and programmable voltage reference. The MCU wakes from sleep on comparator edge, samples the sensor, and returns to sleep, achieving sub-10 uA average current for thermocouple or photodiode front ends. The 20 MHz headroom is overkill for low-rate sampling but provides instruction budget for IIR filtering. Decouple VDD with 100 nF plus 10 uF bulk; tie MCLR to VDD through 10 kohm for stable resets.
Recommended
Automotive Body Electronics
The PIC16C622A-20E/SS serves interior lighting controllers, seat-position switches, and HVAC blend-door actuators where its -40C to +125C industrial grade survives under-dash thermal stress. The 20 MHz RISC core runs PWM routines for LED dimming and stepper driving at 25 mA per I/O. While not AEC-Q100 qualified, the part is widely used in non-safety body modules. Place bypass capacitors within 5 mm of VDD and isolate the MCU from relay coil flyback via optocouplers or TVS diodes.
Recommended
Hobby and Educational Embedded Projects
Universities and makers use the PIC16C622A-20E/SS as a teaching vehicle for assembly-language programming and embedded fundamentals because the 35-instruction PIC16C ISA is approachable for beginners. The 3.5 KB OTP requires students to commit working code, instilling firmware-completion discipline. Combined with the MPLAB PM3 programmer and PICkit debug header, the device supports a full development flow. Use the JW windowed variant for student iteration, then migrate final code to the OTP SSOP version for production.
Recommended
Power Supply Auxiliary Controllers
SMPS secondary-side controllers and battery chargers use the PIC16C622A-20E/SS as a housekeeping MCU for fan-speed control, fault logging, and LED status indication. The 20 MHz core monitors comparator-based over-current and over-voltage conditions within sub-microsecond latency thanks to single-cycle instruction execution. The 13 I/O drive status LEDs and I2C/SPI peripherals for telemetry. Operate the MCU from an auxiliary 5 V winding with 100 nF plus 10 uF bulk decoupling for clean ADC-less analog reads.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-20E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20E/SS | PIC16C620A-20E/SS | PIC16C621A-20E/SS | PIC16C622-20/SS | PIC16C622A-20E/P |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP (0.209") | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin PDIP - different footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +125C (E grade) | -40C to +125C (E grade) | -40C to +125C (E grade) | -40C to +125C (E grade) | 0C to +70C (commercial) | -40C to +125C (E grade) |
| Analog Comparators | 2 with programmable Vref | 2 with programmable Vref | 2 basic | 1 with Vref | 2 with programmable Vref | 2 with programmable Vref |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
Key Differentiators
- Dual analog comparators with programmable voltage reference (vs PIC16C621A-20E/SS)
- Industrial -40C to +125C temperature grade (vs PIC16C622-20/SS)
- Compact 20-pin SSOP surface-mount package (vs PIC16C622A-20E/P)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin (pin 14), plus a 10 uF bulk tantalum or aluminum capacitor on the supply rail. The PIC16C622A-20E/SS draws approximately 2 mA at 5 V / 20 MHz active and 1 uA in sleep. Place the bulk cap where it serves multiple ICs to minimize inrush during MCLR release. Tie MCLR (pin 4) to VDD through a 10 kohm pull-up to allow in-circuit programming while preventing spurious resets from EMI.
For the 20-pin SSOP (0.209", 5.30 mm width), route traces on 0.5 mm pitch with 0.2 mm trace width and 0.15 mm clearance to escape the fine-pitch leads. Use a ground pour on the top layer tied to VSS (pin 5) for thermal dissipation and EMI shielding. Keep the 20 MHz crystal or resonator within 5 mm of pins 15-16 (OSC1/OSC2) and guard the area with a ground ring to reduce radiated emissions below the EN 55022 Class B limit.
Do not assume the PIC16C622A-20E/SS is re-programmable; it is OTP EPROM and can only be programmed once. Use the JW windowed PIC16C622A/JW variant during firmware development and switch to the OTP SSOP version only for locked production. Avoid driving any I/O pin above VDD or below VSS even momentarily; the ESD diodes will clamp and may cause latch-up. Configure unused I/O as outputs low rather than inputs to minimize current draw.
The 20 MHz PIC16C622A-20E/SS has a 200 ns instruction cycle and a 14-bit instruction fetch that produces sharp supply current transients on every clock edge. Place a 100 nF X7R bypass within 5 mm of VDD and a 10 uF tantalum bulk cap within 25 mm to maintain VDD within +/- 50 mV during full-load operation. Long MCLR traces should be guarded with a ground trace to prevent radiated EMI from coupling into the reset line.
Compliance Information
RoHS and REACH compliance confirmed via JLCPCB and Heisener distributor listings as of 2026-09-17. AEC-Q100 not qualified - choose PIC18 automotive-grade devices for safety-critical automotive applications. Halogen-free status not stated in verified web data.
