PIC16C622A-20I/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C622A-20I/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.21 | $4.21 |
| 10 | $3.95 | $39.50 |
| 100 | $3.62 | $362.00 |
| 500 | $3.21 | $1,605.00 |
| 1,000 | $2.89 | $2,890.00 |
PIC16C622A-20I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/Flash/OTP), volatile data memory (RAM), and programmable peripheral I/O on one die, designed to execute firmware that interacts with sensors, actuators, and communication buses in real time. Within the broader semiconductor taxonomy, MCUs sit under microcontrollers -> microprocessors -> logic ICs -> integrated circuits (ICs). The PIC16C mid-range family uses a Harvard RISC architecture with a 14-bit instruction word optimized for compact code density, distinguishing it from the PIC16F flash family and the PIC18 advanced family.
Key features of the PIC16C622A include a wide 2.5V to 5.5V operating voltage range (enabling both 3.3V and 5V systems), two analog comparators, internal oscillator option, and 128 bytes of data RAM. The 8-bit timer/counter, watchdog timer, and programmable code protection support robust fault-tolerant firmware. Industrial temperature grade and 1000 erase/write cycle endurance on OTP (limited; see datasheet) align with high-reliability embedded requirements. The SOIC-18 package is a surface-mount variant with 0.300 inch body width for industrial PCB assembly.
This device uses CMOS EPROM-based technology with a 14-bit instruction word and an 8-bit data path, consuming under 2 mA typical at 5V/4 MHz. The PIC16C622A operates at 20 MHz with a 200 ns instruction cycle, which determines throughput for tight control loops. The integrated analog comparators enable direct interface to analog signals without external op-amps, saving board area. A programmable code-protection bit prevents unauthorized firmware read-back, an important security feature for commercial deployments.
Typical applications include appliance control (washing machines, microwave ovens), industrial sensor interfaces, automotive body electronics (non-safety), battery chargers, and remote-control transmitters. Industrial automation subsystems such as motor speed controllers, HVAC damper actuators, and security keypads also benefit from this MCU. The industrial temperature grade supports outdoor and factory-floor deployments. Compared to PIC16F flash parts, OTP devices are lower cost in volume and well-suited to mature, fully-debugged firmware where in-field reprogramming is not required.
When designing with PIC16C622A, note that OTP memory cannot be reprogrammed - firmware must be 100% validated or you will scrap parts. Use the ICSP (In-Circuit Serial Programming) interface or MPLAB PM3 device programmer for prototype bring-up. A decoupling capacitor of 0.1 uF placed close to VDD is mandatory, with additional bulk capacitance recommended near the voltage regulator. Programming voltage (VPP) of approximately 13V is required for OTP programming; verify the programming socket or ICSP header matches the Microchip reference design.
This page synthesizes distributor pricing tiers, drop-in alternatives from the same PIC16C mid-range family, and practical design notes not collected in a single datasheet section, giving the engineer a decision-ready reference.
Drop-in alternatives for PIC16C622A-20I/SO β 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/SO (same form factor and footprint) β differing in Package, Program Memory Size, Program Memory Type, Timers, Family.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C622A-04I/SO
β Drop-Inβ In Stock
$2.72 / Unit
View Datasheet βPIC16C622A-20I/SO Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC16C Mid-Range |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| Data Memory (RAM) | 128 bytes |
| CPU Speed | 20 MHz maximum clock input |
| Instruction Cycle | 200 ns (single-cycle) |
| Operating Voltage | 2.5 V to 5.5 V |
| I/O Pins | 13 |
| Analog Comparators | 2 internal |
| Timers | 8-bit Timer/Counter (TMR0) |
| Watchdog Timer | Yes (WDT) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 18-SOIC (SO-18, 0.300 inch body) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
PIC16C622A-20I/SO Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / analog comparator input |
| Pin 2 | RA3/AN3 β PORTA bit 3 / analog comparator input |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / TMR0 clock input |
| Pin 4 | MCLR/VPP β Master clear reset / programming voltage |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β PORTB bit 0 / external interrupt |
| Pin 7 | RB1 β PORTB bit 1 |
| Pin 8 | RB2 β PORTB bit 2 |
| Pin 9 | RB3 β PORTB bit 3 |
| Pin 10 | RB4 β PORTB bit 4 |
| Pin 11 | RB5 β PORTB bit 5 |
| Pin 12 | RB6 β PORTB bit 6 |
| Pin 13 | RB7 β PORTB bit 7 |
| Pin 14 | VDD β Positive supply (2.5V to 5.5V) |
| Pin 15 | OSC2/CLKOUT β Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN β Oscillator input / external clock |
| Pin 17 | RA0/AN0 β PORTA bit 0 / analog comparator input |
| Pin 18 | RA1/AN1 β PORTA bit 1 / analog comparator input |
Typical Applications
PIC16C622A-20I/SO is suitable for 6 applications: Appliance Control (Washing Machine / Microwave), Industrial Sensor Interface Module, Battery Charger Control, Remote Control Transmitter / Receiver, HVAC Damper Actuator Controller, Security Keypad / Access Controller.
Appliance Control (Washing Machine / Microwave)
The PIC16C622A-20I/SO fits household appliance control boards because of its deterministic 200 ns instruction cycle, two integrated analog comparators for level/temperature sensing, and industrial -40C to +85C temperature grade. Its 3.5 KB OTP memory holds mature firmware for motor timing sequences, relay driving via PORTB, and safety interlocks. In a washing machine controller, the MCU reads water level sensors through the comparators, drives triac optocouplers for motor/valve switching, and sequences the wash cycle based on button inputs. The wide 2.5V to 5.5V supply allows direct operation from rectified mains with a simple linear regulator.
Recommended
Industrial Sensor Interface Module
The PIC16C622A-20I/SO is well-suited for industrial sensor conditioning boards because its two internal analog comparators eliminate external op-amps for threshold detection, reducing BOM cost. Operating from -40C to +85C industrial range, the MCU reliably interfaces with thermocouples, photocells, and pressure transducers in factory automation environments. The 13 I/O pins multiplex sensor inputs and digital outputs to upstream PLCs. With a 20 MHz clock, it can bit-bang RS-485 or UART protocols to communicate sensor data at 9600 to 115200 baud without an external transceiver, while the wide 2.5V-5.5V supply accepts 24V industrial bus rails through a linear regulator.
Recommended
Battery Charger Control
The PIC16C622A-20I/SO works in lead-acid and NiMH battery charger applications because the analog comparators sense battery voltage and current directly without external ADC hardware. Its low operating current under 2 mA at 5V preserves battery standby time, while the 2.5V to 5.5V supply range covers single-cell Li-ion (3.7V nominal) and 6V lead-acid systems. The OTP program memory ensures the charge algorithm cannot be corrupted in the field. In a typical charger, the MCU monitors battery voltage via the comparator, controls a MOSFET via PWM on PORTB, and terminates charge at the precise voltage threshold with high repeatability.
Recommended
Remote Control Transmitter / Receiver
The PIC16C622A-20I/SO is ideal for remote control encoders/decoders because its low cost and small 18-SOIC footprint fit inside handheld enclosures. With the 20 MHz clock, it can bit-bang Manchester or PWM-encoded RF/IR protocols at 38 kHz carrier frequency directly from PORTB, eliminating encoder ICs. The 13 I/O pins accept button matrices up to 4x4 with minimal external logic. Operating at 2.5V to 5.5V, it runs from a single CR2032 coin cell via a low-dropout regulator. The OTP memory locks the protocol firmware permanently, preventing counterfeit replication of proprietary RF encodings.
Recommended
HVAC Damper Actuator Controller
The PIC16C622A-20I/SO integrates well into HVAC damper actuator motor controllers because the industrial temperature rating covers attic and rooftop unit environments, and the comparators monitor motor current for stall detection without external current-sense amplifiers. The 8-bit TMR0 generates precise PWM for DC motor speed control, while the 13 I/O pins drive H-bridge MOSFETs via optocouplers. Operating at 20 MHz, the MCU closes the motor control loop at 5 kHz or higher, supporting smooth damper positioning. The OTP program memory locks the calibration constants set during factory tuning, preventing field drift of HVAC setpoints.
Recommended
Security Keypad / Access Controller
The PIC16C622A-20I/SO serves security keypad controllers because its OTP program memory prevents reverse-engineering of access codes and the 3.5 KB code space fits a full 4x4 matrix scan algorithm plus EEPROM emulation in flash. The internal comparators monitor tamper switches and door position sensors, triggering alarm outputs on PORTB. Operating from 2.5V to 5.5V, it runs directly from a 12V backup battery through a regulator. The 20 MHz instruction cycle lets it debounce and scan the entire 16-key matrix in under 1 ms, ensuring responsive user experience while maintaining the rugged industrial temperature grade for outdoor keypads.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-20I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-04I/SO | PIC16C622A-20E/P | PIC16C622A-04I/P | PIC16C622A/JW |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (SO-18) | 18-SOIC (SO-18) - same | 18-PDIP - different (through-hole) | 18-PDIP - different (through-hole) | 18-CERDIP - different (windowed) |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP - same | 3.5 KB OTP - same | 3.5 KB OTP - same | 3.5 KB EPROM (windowed) - same die |
| CPU Speed | 20 MHz | 4 MHz (-80%) | 20 MHz - same | 4 MHz (-80%) | 20 MHz - same |
| Operating Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C (Industrial) - same | -40C to +125C (Extended) - wider | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same |
| I/O Pins | 13 | 13 - same | 13 - same | 13 - same | 13 - same |
| Programmability | OTP (one-time) | OTP - same | OTP - same | OTP - same | Windowed EPROM (UV erasable) - reusable |
Key Differentiators
- Industrial temperature grade -40C to +85C (vs PIC16C622A-20/SO)
- Surface-mount SOIC-18 vs through-hole alternatives (vs PIC16C622A-20E/P)
- One-time programmable for IP protection (vs PIC16F628A-I/SO)
Design Notes
PIC16C622A OTP memory cannot be reprogrammed once blown - validate your firmware on a PIC16F628A-I/SO (Flash, pin-compatible 18-SOIC) or PIC16C622A/JW (windowed CERDIP) before committing to OTP production parts. A bad firmware batch will scrap every programmed unit. Estimated: using PIC16F628A for development adds about $0.50 per unit but saves thousands in scrapped OTP inventory.
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin (14) and another 0.1 uF next to VSS (pin 5), with the ground via directly under the IC. For multi-rail designs, add a 10 uF bulk capacitor near the voltage regulator output. The MCU draws under 2 mA typical at 5V/4 MHz but can spike to 15 mA during EEPROM writes or PORTB transitions; ensure your regulator has at least 30% headroom.
Keep the 20 MHz crystal (or resonator) traces on pins OSC1 (16) and OSC2 (15) shorter than 10 mm and shield them with a ground pour. Place the crystal within 5 mm of the MCU. Avoid routing high-frequency digital signals (PORTB switching outputs) under the crystal area. The MCLR pin (4) requires a 10 kohm pull-up to VDD and a 100 nF decoupling cap to ground for in-circuit serial programming (ICSP) reliability.
Compliance Information
RoHS, REACH, and lead-free status were not stated in the verified distributor and datasheet excerpts provided. For AEC-Q100 automotive qualification, consider the PIC16F628A-I/SO automotive grade instead. Confirm compliance with the Microchip material declaration sheets before volume procurement.
