PIC16C622A-20I/P - 8-Bit 20MHz 3.5KB OTP MCU 18-PDIP | Microchip
MPN: PIC16C622A-20I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.23 | $3.23 |
| 10 | $2.98 | $29.80 |
| 100 | $2.65 | $265.00 |
| 500 | $2.32 | $1,160.00 |
| 1,000 | $2.1 | $2,100.00 |
PIC16C622A-20I/P Overview
An MCU (microcontroller) is a single-chip computer containing a CPU core, program memory, data memory, and programmable I/O peripherals. The PIC16C62X family falls within the 8-bit PIC RISC architecture hierarchy: 8-bit MCU -> PIC RISC -> PIC16C mid-range -> PIC16C62X sub-family -> peripheral-rich EPROM/OTP devices. Within Microchip's portfolio, OTP EPROM parts bridge early-development ROM-based designs and field-programmable Flash parts, providing fixed-program memory at lower cost than windowed EPROM.
Key features include only 35 single-cycle instructions to learn, 200 ns instruction execution (except two-cycle branches), 13 I/O pins with individual direction control, a watchdog timer, a 16-bit timer/counter with 8-bit prescaler, and an 8-bit A/D converter channel set. The -I industrial temperature grade makes this part suitable for factory-floor and outdoor enclosures, while the -20 speed grade supports deterministic control loops at kHz-to-MHz rates. The OTP memory architecture means firmware is permanently written during production programming.
The PIC16C622A uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in the same cycle. The 14-bit instruction word and 8-bit data path are characteristic of PIC mid-range cores, providing higher code density than 8-bit CISC architectures for byte-oriented control code. Industrial peripherals such as capture/compare/PWM (CCP) and USART are not present on this specific variant, keeping the die compact for cost-sensitive applications.
Typical applications include appliance control, sensor signal conditioning, low-end user interfaces, LED driving, small motor control, and white-goods timing. The 18-pin PDIP form factor suits breadboard prototyping, legacy through-hole assemblies, and educational/training kits where socketed replacement aids debugging.
When designing, note that OTP memory cannot be reprogrammed, so firmware verification before programming is critical. Industrial -I temperature grade allows operation from -40C to +85C; for extended -40C to +125C operation choose a -E grade variant or a Flash-based PIC16F equivalent.
This page consolidates distributor stock, drop-in replacements, and design guidance that the manufacturer datasheet alone does not present.
Drop-in alternatives for PIC16C622A-20I/P — 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-20I/P (same form factor and footprint) — differing in Package, RoHS Status, Core Architecture, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-20E/P
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16C622A-04I/P
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC16C622A-04E/P
✅ Drop-In✓ In Stock
$1.3 / Unit
View Datasheet →PIC16C622A/JW
✅ Drop-In✓ In Stock
$9.25 / Unit
View Datasheet →PIC16F628A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-20I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (mid-range) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| RAM | 128 bytes |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle | 200 ns (single cycle) |
| I/O Pins | 13 |
| Operating Voltage Range | 3.0 V to 5.5 V (typical 3.3 V / 5 V) |
| Operating Temperature Range | -40C to +85C (industrial grade) |
| Package | 18-pin PDIP (Plastic DIP) |
| Mounting Type | Through-Hole |
| Pin/Package Code | P (PDIP) |
| Instruction Set | 35 instructions |
| Timers | 1 x 16-bit timer/counter with 8-bit prescaler + WDT |
| A/D Converter | 8-bit |
| RoHS Status | Non-compliant (PDIP lead-finish) |
| Lead-Free | no |
PIC16C622A-20I/P Pin Configuration
| Pin 1 | RA2 — PORTA I/O bit 2 / AN2 analog input |
| Pin 2 | RA3 — PORTA I/O bit 3 / AN3 analog input |
| Pin 3 | RA4 — PORTA I/O bit 4 / T0CKI timer0 clock input |
| Pin 4 | MCLR — Master Clear reset input (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — PORTB I/O bit 0 / external interrupt input |
| Pin 7 | RB1 — PORTB I/O bit 1 |
| Pin 8 | RB2 — PORTB I/O bit 2 |
| Pin 9 | RB3 — PORTB I/O bit 3 |
| Pin 10 | RB4 — PORTB I/O bit 4 |
| Pin 11 | RB5 — PORTB I/O bit 5 |
| Pin 12 | RB6 — PORTB I/O bit 6 |
| Pin 13 | RB7 — PORTB I/O bit 7 |
| Pin 14 | VCC — Positive supply voltage (3.0-5.5 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 17 | RA0 — PORTA I/O bit 0 / AN0 analog input |
| Pin 18 | RA1 — PORTA I/O bit 1 / AN1 analog input |
Typical Applications
PIC16C622A-20I/P is suitable for 6 applications: White-Goods Appliance Control, HVAC Sensor Signal Conditioning, LED Display Drivers, Industrial Timer and Counter Modules, Educational and Training Kits, Low-End Remote Control Transmitters.
White-Goods Appliance Control
The PIC16C622A-20I/P is well suited to white-goods appliance controllers such as washing machines, dishwashers, and microwave ovens. The 8-bit PIC core with 35 single-cycle instructions, 200 ns cycle time, and 20 MHz clock provides deterministic execution for sensor polling, motor relay sequencing, and user-input debounce. The 13 I/O lines easily drive triac interface circuits, mechanical relay coils, and seven-segment display drivers via current-limiting resistors. Industrial -40C to +85C temperature grade tolerates kitchen and laundry-room thermal environments. The OTP EPROM memory keeps unit cost low for high-volume consumer appliances where firmware is fully validated and never changes after production programming. Program memory of 3.5 KB (2K x 14 words) accommodates sophisticated state-machine control logic, lookup tables for sensor calibration, and character maps for LED displays. Combined with the on-chip 16-bit timer/counter with 8-bit prescaler, the part generates accurate timing for pump cycles and heater PWM, replacing discrete 555-based timing networks.
Recommended
HVAC Sensor Signal Conditioning
The PIC16C622A-20I/P fits HVAC sensor-signal-conditioning nodes that digitize analog thermistor, humidity, and pressure transducers and present a clean digital output to a master controller. The on-chip 8-bit A/D converter samples analog sensors directly, while the 13 I/O pins route multiple sensor channels and drive indicator LEDs. Industrial -40C to +85C operation tolerates rooftop and basement HVAC enclosures. The 128-byte RAM buffers short sample histories before transmitting via bit-banged UART to the master controller. The 20 MHz clock and 200 ns cycle allow fast polling of multiple sensor channels without missing interrupts. The 3.5 KB OTP memory holds lookup tables for thermistor linearization and humidity-to-dew-point conversions. The wide 3.0-5.5 V supply range supports both 3.3 V low-power sensor nodes and 5 V industrial bus nodes. Watchdog timer ensures the node recovers from brown-out or firmware lockup conditions that can occur in electrically noisy HVAC equipment rooms.
Recommended
LED Display Drivers
The PIC16C622A-20I/P drives multiplexed LED matrix and seven-segment displays in signage, indicator panels, and scoreboards. The 13 I/O pins combined with software multiplexing can scan up to 8 digits with segment-and-digit drive, while the 20 MHz clock provides flicker-free refresh rates above 100 Hz. The 3.5 KB OTP program memory holds character font tables, animation state machines, and dimming curves. The 128-byte RAM buffers the display frame buffer and scrolling text strings. Industrial temperature grade supports outdoor signage cabinets in temperate climates. The PIC16C62X's deterministic single-cycle execution keeps display refresh jitter-free, which is critical for visual artifacts in high-speed scrolling text. The wide 3.0-5.5 V operating voltage allows direct connection to 5 V LED array drivers, simplifying BOM. Brown-out detection prevents visual glitches during power-up and power-down sequences that can permanently damage multiplexed displays.
Recommended
Industrial Timer and Counter Modules
The PIC16C622A-20I/P serves as a programmable industrial timer or counter in process-control cabinets, replacing legacy 555/CMOS-logic timing circuits. The on-chip 16-bit timer/counter with 8-bit prescaler provides 24-bit effective timing range when cascaded, suiting long-duration timing tasks such as conveyor dwell times, batching cycles, and lubrication intervals. The 13 I/O pins drive relay outputs, accept start/stop pushbuttons, and read mode-select DIP switches. Industrial temperature grade and 3.0-5.5 V supply tolerance handle factory-floor electrical noise and supply variation. The 3.5 KB OTP memory stores timing-curve lookup tables and mode-selection menus without risk of accidental field reprogramming. The 20 MHz clock and 200 ns cycle keep timer accuracy within 0.01 percent, far exceeding electromechanical timer drift. Watchdog timer recovers the controller from EMI-induced firmware lockup common near motor drives and welding equipment.
Recommended
Educational and Training Kits
The PIC16C622A-20I/P is widely used in university microcontroller courses and embedded-systems training kits because of its simple PIC16C62X instruction set (only 35 instructions) and breadboard-friendly 18-pin PDIP package. The 0.1-inch pin pitch drops directly into solderless breadboards and IC sockets, supporting repeated programming cycles during student labs. The OTP EPROM requires deliberate programming discipline - students must verify code on simulator before burning, reinforcing development best practices. The 20 MHz clock and 200 ns cycle expose students to real-time control fundamentals including timer-driven interrupts, port-bit-banging, and watchdog recovery. The 128-byte RAM and 3.5 KB program memory are large enough for meaningful labs (PWM generation, UART bit-banging, keypad scanning) yet small enough to teach memory-constrained programming. The wide 3.0-5.5 V supply protects student-built regulator mistakes. The -40C to +85C industrial temperature grade tolerates classroom environment variations.
Recommended
Low-End Remote Control Transmitters
The PIC16C622A-20I/P fits low-end remote-control transmitters for toys, ceiling fans, garage-door openers, and simple industrial remote keyfobs. The 8-bit PIC core with 20 MHz clock generates precise carrier-frequency tones for ASK/FSK modulation, while the 13 I/O pins read multi-button keypads and drive IR LEDs or RF transmitter modules. Industrial temperature grade supports automotive and outdoor usage. The 3.5 KB OTP program memory holds encoding tables and rolling-code algorithms in security-conscious designs. The 128-byte RAM buffers keypress sequences and timing variables. The 3.0-5.5 V supply range runs directly from 3 V coin cells or 5 V USB-powered setups, eliminating boost regulators. Low power consumption and the on-chip watchdog timer maximize battery life by sleeping between button presses. Brown-out detection prevents accidental transmission of invalid codes during battery end-of-life voltage dips.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-20E/P | PIC16C622A-04I/P | PIC16C622A-04E/P | PIC16C622A/JW | PIC16F628A-I/P |
|---|---|---|---|---|---|---|
| Package | 18-PDIP | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same | 18-CDIP (windowed) - same pin count | 18-PDIP - same |
| 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 EPROM (UV-erasable) | 3.5 KB Flash |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 16 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Windowed EPROM (UV-erasable) | Flash (reprogrammable) |
Key Differentiators
- Industry-standard PIC16C62X 8-bit core with only 35 instructions to learn (vs PIC16C622A-04I/P)
- 20 MHz operation supports deterministic real-time control loops (vs PIC16C622A-04I/P)
- Industrial -40C to +85C temperature grade fits factory and consumer applications (vs PIC16C622A-20E/P)
- OTP EPROM memory provides lower per-unit cost than Flash equivalents at high volume (vs PIC16F628A-I/P)
Design Notes
OTP EPROM memory cannot be erased or reprogrammed. Once a part is programmed, the firmware is permanent. Always verify the firmware image (checksum, code walkthrough) on a windowed PIC16C622A/JW sample before committing the production OTP order. A typical production OTP programming flow is: (1) compile, (2) simulate in MPLAB, (3) program a windowed sample and bench-validate, (4) program production OTP units. Programming a bug into OTP units scrapes the entire batch, so OTP is best for fully validated high-volume runs.
The 18-pin PDIP package uses 0.1-inch (2.54 mm) pin spacing, which is breadboard-friendly but through-hole only. For surface-mount production, migrate to the PIC16C622A-20I/SO (SOIC-18) variant, which shares the same die and pinout. Place a 100 nF decoupling capacitor as close as possible to the VCC pin (pin 14) and a 10 uF bulk capacitor on the supply rail. If using a crystal oscillator, place the load capacitors within 5 mm of OSC1 (pin 16) and OSC2 (pin 15) and keep traces short to avoid EMI coupling.
Operating voltage range is 3.0 V to 5.5 V. For 5 V designs, ensure the supply stays within +/-10 percent; for 3.3 V battery-powered designs, the brown-out detector should be enabled in the configuration word to prevent code corruption at end-of-life battery voltage. The PIC16C622A-20I/P draws approximately 2 mA at 5 V and 20 MHz active, dropping to microamp-level standby in sleep mode. For battery applications, leverage the sleep mode and watchdog wake-up to minimize average current to under 100 uA.
Industrial temperature grade -40C to +85C supports most factory and consumer environments but excludes automotive under-hood (-40C to +125C). For extended-temperature designs, choose the PIC16C622A-20E/P variant, which is qualified to -40C to +125C. The PDIP package dissipates approximately 250 mW typical at 20 MHz and 5 V, well within the thermal envelope for industrial-temperature operation. No external heatsink is required.
Compliance Information
PDIP package uses Sn/Pb lead finish and is therefore not RoHS-compliant by default; for RoHS-compliant designs, choose the SOIC-18 (PIC16C622A-20I/SO) variant. REACH compliance per Microchip product declarations. Not AEC-Q100 qualified; for automotive choose PIC16C622A-20E/P or migrate to PIC16F-family automotive-grade parts.
