PIC16C622A/JW - 8-bit 20MHz 3.5KB EPROM MCU | Microchip
MPN: PIC16C622A/JW ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.1 | $131.00 |
| 100 | $11.75 | $1,175.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.25 | $9,250.00 |
PIC16C622A/JW Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one die. The PIC architecture pioneered Harvard memory separation and RISC instruction sets, with the PIC16C series introducing one-time-programmable (OTP) EPROM for code storage and an instruction set reduced to 35 single-cycle opcodes. The PIC16C622A/JW belongs to the PIC16C62X sub-family that adds a 16-bit timer/counter, an 8-bit timer, and a capture/compare/PWM (CCP) module, positioning it between basic PIC16C5X parts and the more advanced PIC16C7X series.
Key features include an operating frequency up to 20 MHz, instruction-cycle time of 200 ns, an 8-bit ADC-free analog comparator, a synchronous serial port (SSP), and a programmable code protection scheme. Power consumption is typically below 2 mA at 5V/4 MHz and falls below 1 µA in sleep mode, supporting battery-aware applications. The /JW suffix indicates a windowed CERDIP package that allows UV erasure for prototype development and code iteration.
Architecturally, the device uses a 14-bit instruction word with an 8-bit data path, eight-level hardware stack, and direct/indirect addressing modes. Watchdog timer with on-chip RC oscillator, power-on reset, brown-out detect, and in-circuit serial programming (ICSP) support streamline field deployment.
Typical applications include industrial control logic, sensor signal conditioning, motor drive interfacing, security panel controllers, and legacy medical instrumentation where deterministic real-time response and field-proven reliability outweigh the need for modern peripherals. The windowed CERDIP package is most often used during prototype bring-up before moving to plastic OTP or flash variants for production.
When designing with this part, select a 4 MHz to 20 MHz crystal or resonator with appropriate load capacitors and reserve one I/O line for in-circuit serial programming. Decouple VDD with 100 nF ceramic close to the pins, and place a bulk electrolytic on the board input rail.
This page synthesizes distributor pricing, drop-in alternatives within the same 18-pin CERDIP footprint, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for PIC16C622A/JW — 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/JW (same form factor and footprint) — differing in Package, Program Memory Type, Core Architecture, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-20/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-20/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC16C621A/JW
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C620A/JW
✅ Drop-In✓ In Stock
$8.25 / Unit
View Datasheet →PIC16C621-04/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-04/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C56/JW
✅ Drop-In✓ In Stock
$7.4 / Unit
View Datasheet →PIC16C622A/JW Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Instruction Set | 35 single-cycle instructions |
| Program Memory Type | OTP EPROM (windowed for UV erase in /JW package) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| EEPROM Data Memory | Not present |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (DC to 20 MHz) |
| Number of I/O Pins | 13 |
| Timers | 1 x 8-bit, 1 x 16-bit (Timer0/Timer1) |
| Capture/Compare/PWM | 1 x CCP module |
| Analog Peripherals | Analog comparator (no ADC) |
| Serial Interface | Synchronous Serial Port (SSP / SPI) |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Brown-out Reset | Yes |
| In-Circuit Serial Programming | Yes (ICSP) |
| Operating Voltage | 2.5 V to 6.0 V |
| Operating Temperature | 0C to +70C (commercial) |
| Package | 18-pin CERDIP Window (WDIP, 0.300 in / 7.62 mm) |
| Mounting Type | Through-Hole |
| RoHS Status | Non-compliant (contains lead, ceramic window package) |
PIC16C622A/JW Pin Configuration
| Pin 1 | /MCLR/VPP — Master Clear (Reset) input / programming voltage |
| Pin 2 | RA0/AN0+ — PORTA bit 0 / analog comparator non-inverting input |
| Pin 3 | RA1/AN1- — PORTA bit 1 / analog comparator inverting input |
| Pin 4 | RA2 — PORTA bit 2 |
| Pin 5 | RA3 — PORTA bit 3 |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock output (Fosc/4) |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SSP SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SSP SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SSP SPI data out |
| Pin 16 | RC6 — PORTC bit 6 |
| Pin 17 | RC7 — PORTC bit 7 |
| Pin 18 | VDD — Positive supply (2.5 V to 6.0 V) |
Typical Applications
PIC16C622A/JW is suitable for 6 applications: Industrial Control Logic, Security and Access Control Panels, Sensor Signal Conditioning Front-End, Motor Drive and Stepper Control, Legacy Medical Instrumentation, Educational and Prototype Development.
Industrial Control Logic
The PIC16C622A/JW's 20 MHz instruction cycle and 128 bytes RAM suit it for deterministic industrial control loops running at sub-millisecond update rates. The 16-bit Timer1 with capture input enables precise period measurement of tachometer pulses, while the CCP module generates PWM outputs for proportional solenoid or heater drive. With 2.5 V to 6.0 V VDD operation and brown-out reset, the part tolerates noisy 24 V-derived rails commonly found in factory floors. Placing the ICSP clock/data on RB6/RB7 allows in-system firmware updates without board removal during commissioning. The windowed CERDIP package supports iterative calibration routines where UV erasure is acceptable between tuning cycles.
Recommended
Security and Access Control Panels
Security panels benefit from the PIC16C622A/JW's 13 I/O pins for keypad scanning, LED indicators, relay drivers, and a buzzer interface. The SSP/SPI port connects to external EEPROM or real-time-clock chips for storing access logs and timestamps, while the analog comparator monitors the backup battery voltage. The 200 ns instruction cycle ensures rapid response to tamper-switch interrupts. The 3.5 KB EPROM fits typical keypad-decode plus communication-state-machine firmware. The windowed CERDIP package lets engineers iterate on encrypted protocol code during development, which is critical when porting proprietary credential formats.
Recommended
Sensor Signal Conditioning Front-End
The PIC16C622A/JW's analog comparator is ideal for threshold-detect sensor front-ends such as thermocouple cold-junction monitors, photodiode current-trip alarms, or Hall-effect speed-sensor interfaces. The 16-bit Timer1 can capture pulse widths from reflective optical encoders with sub-microsecond resolution when clocked at 20 MHz. The CCP PWM module drives excitation current into resistive sensors via a switched constant-current source, while the SSP port reads digital temperature chips like the TC72. The windowed CERDIP package is preferred in research-grade instrumentation where firmware tuning is ongoing.
Recommended
Motor Drive and Stepper Control
Stepper and small DC-motor control leverages the PIC16C622A/JW's CCP PWM channel and 16-bit Timer1 to generate precise phase-step waveforms. At 20 MHz, the part produces 50 kHz PWM with 8-bit resolution directly, suitable for unipolar stepper coils up to 24 V through external MOSFET drivers. The 13 I/O lines drive four phase outputs plus enable, fault, and tachometer feedback signals. Brown-out reset protects the motor from spurious operation during supply dips. The windowed CERDIP package is chosen during prototype bring-up when tuning acceleration ramps.
Recommended
Legacy Medical Instrumentation
Medical devices in long-life-cycle fields (analyzers, infusion pumps) often rely on the PIC16C622A/JW for deterministic real-time response, field-proven reliability, and the ability to recalibrate firmware via UV erasure during depot repair. The 2.5 V to 6.0 V range accommodates battery-powered portable monitors, and the analog comparator handles ECG or pulse-oximeter threshold detection. The 128-byte RAM fits small protocol stacks for RS-232 patient-data upload via the SSP and external UART. The windowed CERDIP package is also specified in many legacy FDA-cleared designs, making drop-in replacement critical.
Recommended
Educational and Prototype Development
The PIC16C622A/JW remains a teaching staple in university embedded-systems labs because the windowed CERDIP package lets students erase and re-flash code dozens of times during term projects. The 35-instruction PIC16C instruction set is approachable for first-time MCU programmers, while the 20 MHz ceiling and CCP/SSP peripherals provide headroom for advanced projects. Instructors use the same PIC16C62X family across the curriculum, with /JW ceramic packages supplied in lab kits. Migration to PIC16F628A flash parts is covered in upper-level courses, building on the same peripheral knowledge.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A/JW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-20/P | PIC16C621A/JW | PIC16C620A/JW | PIC16C622-04/P | PIC16C56/JW |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin CERDIP Window | 18-pin PDIP - same footprint | 18-pin CERDIP Window - same | 18-pin CERDIP Window - same | 18-pin PDIP - same footprint | 18-pin CERDIP Window - same |
| Program Memory | 3.5 KB (2K x 14) EPROM | 3.5 KB (2K x 14) OTP | 1.75 KB (1K x 14) EPROM | 1 KB (512 x 14) EPROM | 1.75 KB (1K x 14) EPROM | 1.5 KB (1K x 12) EPROM |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 72 bytes |
| Timers | 8-bit + 16-bit | 8-bit + 16-bit | 8-bit + 16-bit | 8-bit + 16-bit | 8-bit + 16-bit | 8-bit only |
| CCP / PWM | 1 x CCP | 1 x CCP | 1 x CCP | 1 x CCP | 1 x CCP | None |
| SSP / SPI | Yes | Yes | Yes | No | Yes | No |
| Windowed (UV erase) | Yes (/JW) | No (plastic OTP) | Yes | Yes | No (plastic OTP) | Yes |
| RoHS Compliance | Non-compliant | Varies by suffix | Non-compliant | Non-compliant | Varies by suffix | Non-compliant |
| Approx. Unit Price (USD, qty-1, 2026-09-17) | 14.50 | 5.20 | 13.80 | 12.50 | 4.95 | 11.20 |
Key Differentiators
- Largest program memory in the 18-CERDIP windowed PIC16C6x family (vs PIC16C621A/JW)
- Includes SSP/SPI peripheral for external memory and peripheral expansion (vs PIC16C620A/JW)
- Higher instruction throughput than original 4 MHz PIC16C622 die (vs PIC16C622-04/P)
- Windowed CERDIP enables iterative UV erasure during development (vs PIC16C622A-20/P)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pin 18 and a 10 µF bulk electrolytic on the board's main 5 V rail. The PIC16C622A/JW can source up to 20 mA per I/O pin (max 200 mA total) per the manufacturer datasheet. When driving multiple relays or LEDs, ensure cumulative sink current does not exceed the package dissipation limit - estimated 800 mW at 70C ambient, so a heavy-load driver like ULN2803 is recommended for inductive loads.
Use a fundamental-mode crystal or ceramic resonator on OSC1 (pin 8) and OSC2 (pin 9) with appropriate load capacitors (typically 15-33 pF) referenced to VSS. For cost-sensitive designs, an external RC oscillator on OSC1 is acceptable up to 4 MHz but reduces timing accuracy to roughly ±5%. If using an external clock driver, drive OSC1 with a CMOS-level source and leave OSC2 floating; per datasheet DS30208E, do not exceed 20 MHz at 5 V or 10 MHz at 3 V.
Route the ICSP clock (RB6) and data (RB7) traces away from high-current switching paths and analog sensor inputs to avoid programming glitches and ADC cross-talk. Keep the /MCLR/VPP line short and direct - long traces pick up transients that can trigger spurious resets. A 10 kΩ pull-up on /MCLR to VDD is mandatory; add a diode (1N4148) from VDD to /MCLR to allow the programmer to override the pull-up during VPP application. The 18-pin CERDIP through-hole footprint uses 0.100 in (2.54 mm) pin pitch with 0.300 in row spacing.
Do not assume the PIC16C622A and PIC16C622 are interchangeable: the 622A has twice the program memory (2K x 14 vs 1K x 14) and a slightly different configuration word. Per datasheet DS30208E, the CONFIG register bits differ between the two die revisions, so porting code from a PIC16C622 project requires re-assembly of the configuration bits. Also, when migrating from /JW windowed to plastic PDIP/SOIC, code-protect bits cannot be reversed, so finalize code before blowing CP.
Compliance Information
CERDIP windowed package contains lead in the glass seals and is therefore not RoHS-compliant; the plastic PDIP/SOIC OTP variants can be ordered with RoHS-compliant finishes. REACH compliance is unaffected by package choice. AEC-Q100 qualification is not applicable for legacy EPROM CERDIP parts; automotive customers should select PIC16F628A-I/P or similar flash-based PICs with AEC-Q100 documentation.
