PIC16C622A-20/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C622A-20/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.18 | $4.18 |
| 10 | $3.85 | $38.50 |
| 100 | $3.42 | $342.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC16C622A-20/SO Overview
What is a PIC16C62X microcontroller? It is a member of Microchip's mid-range PICmicro family, which is a RISC (Reduced Instruction Set Computer) architecture that uses a Harvard memory model with separate program and data buses. The PIC16C62X series combines a 14-bit wide instruction word with 8-bit data paths, providing higher code density than 12-bit PIC cores while remaining low-cost and easy to program. Positioned in the hierarchy as microcontroller -> embedded MCU -> 8-bit MCU -> PIC micro -> semiconductor, the PIC16C62X is widely used in appliances, motor control, security systems, and low-cost consumer products.
Key features of the PIC16C622A include 13 digital I/O pins, two analog comparators (a defining trait of the 'C62X family), a watchdog timer, power-on reset, brown-out reset, and 35 single-word instructions. The OTP (One-Time-Programmable) EPROM program memory is programmed with an external device programmer such as the MPLAB PM3. The part also integrates an internal 4MHz RC oscillator option, reducing external component count for cost-sensitive designs.
Typical applications include appliance controls, security and alarm panels, automotive body electronics (non-safety), IR remote controls, sensor signal conditioning, and small motor-driver interfaces. The on-chip comparators allow direct interface with analog sensors without a dedicated op-amp.
When designing with the PIC16C622A-20/SO, note that the OTP variant cannot be reprogrammed in-circuit; use the JW or QFP UV-erasable windowed package for development. Place a 0.1uF decoupling capacitor as close as possible to VDD/VSS and follow Microchip's recommended oscillator layout to avoid start-up problems.
This page synthesizes distributor pricing, cross-reference alternatives from Microchip and competitor sources, and practical design notes not assembled in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C622A-20/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-20/SO (same form factor and footprint) β differing in Instruction Cycle Time, Package, Program Memory Type, Core Architecture, Mounting Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C622-20/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C622A-04/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C622A-04I/SO
β Drop-Inβ In Stock
$2.72 / Unit
View Datasheet βPIC16C621A-20/SO
β Drop-Inβ In Stock
$1.1 / Unit
View Datasheet βPIC16C620A-20/SO
β Drop-Inβ In Stock
$2.04 / Unit
View Datasheet βPIC16C622A-20/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC, Harvard |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Instruction Set Size | 35 instructions (single-word, 14-bit) |
| I/O Pins | 13 |
| Supply Voltage | 2.5 V to 5.5 V |
| Operating Temperature | 0 C to +70 C (Commercial) |
| Package | 18-pin SOIC (SO, 300-mil, 7.50 mm width) |
| Mounting Type | Surface Mount |
| On-Chip Peripherals | 2 analog comparators, WDT, POR, BOR |
| Internal Oscillator | 4 MHz RC (selectable) |
| A/D Converter | None |
PIC16C622A-20/SO Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 β Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI β Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP β Master clear reset (active low) / programming voltage input |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Bidirectional I/O port B bit 0 / external interrupt input |
| Pin 7 | RB1 β Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 β Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 β Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 β Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 β Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 β Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 β Bidirectional I/O port B bit 7 |
| Pin 14 | VDD β Positive supply voltage (2.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT β Oscillator crystal output / clock out |
| Pin 16 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 17 | RA0 β Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 β Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C622A-20/SO is suitable for 6 applications: Appliance Control Board, Security and Alarm Panel, IR Remote Control Transmitter, Sensor Signal Conditioning, Automotive Body Electronics (Non-Safety), Small Stepper and DC Motor Driver.
Appliance Control Board
The PIC16C622A-20/SO fits appliance controls because its 13 GPIO can directly drive relays, triacs, and indicator LEDs at 25 mA per pin without buffer transistors, while the two on-chip analog comparators interface directly with thermistor or line-voltage sense dividers. Operating from 2.5 V to 5.5 V, the same MCU serves both 3.3 V logic-front-panel designs and 5 V power-stage boards. The 35-instruction RISC core and 200 ns cycle time give deterministic response to interrupts from zero-crossing detectors and timer-driven TRIAC firing sequences, while the 3.5 KB OTP accommodates full state-machine firmware. Place a 0.1 uF decoupling capacitor within 5 mm of VDD and follow Microchip's recommended oscillator layout for reliable start-up across cold-oven power-on transients.
Recommended
Security and Alarm Panel
In intrusion alarm panels, the PIC16C622A-20/SO scans up to 13 zones through its GPIO, debounces mechanical reed switches in software, and uses the on-chip comparators to monitor backup-battery voltage against a reference divider - triggering a low-battery alert before the panel goes offline. Brown-out reset and the watchdog timer together prevent firmware lockup if the mains-powered supply sags during a brownout. The 128-byte RAM holds zone-state and event-log scratch buffers, and the 200 ns instruction cycle leaves ample CPU margin for keypad scanning and piezo-buzzer tone generation. For higher-end panels requiring event history retention, an external EEPROM (24LCxx) hangs off any two spare GPIO configured as bit-banged I2C.
Recommended
IR Remote Control Transmitter
Battery-powered remote controls benefit from the PIC16C622A-20/SO's 2.5 V lower rail that lets a single 3 V coin cell run the MCU down to its cutoff, while the internal 4 MHz RC oscillator eliminates two external resonator components to shrink the BOM. The 13 GPIO drive an IR LED through a single transistor at 38 kHz carrier frequency, with the 200 ns instruction cycle accurately generating the mark/space pattern for RC5, NEC, or Sony protocols without hardware timer overhead. Sleep current is well under 1 uA when the comparator-wake or pin-change interrupt is disabled, extending battery life over years of standby. The 3.5 KB OTP accommodates full protocol libraries plus custom button mappings for universal remote applications.
Recommended
Sensor Signal Conditioning
The PIC16C622A-20/SO's two integrated analog comparators let it directly threshold sensor outputs without a dedicated op-amp, making it well suited to battery monitoring, photodiode level detection, and over-temperature shutdown circuits. Each comparator reference is set by an external resistor divider to the GPIO or a fixed internal bandgap, supporting independent trip points for warning and fault conditions. The 20 MHz instruction cycle samples comparator outputs at rates well above 100 kHz, sufficient for tachometer pulse-counting or wheel-speed sensing in light EVs. Combined with the WDT and POR, the same MCU also supervises the analog front-end to safely latch a fault output until host intervention.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety body-control modules such as interior lighting, mirror adjusters, and seat-position memory, the PIC16C622A-20/SO handles switch scanning and MOSFET gate driving at up to 25 mA per pin. While the commercial 0 C to +70 C version does not meet under-hood automotive AEC-Q100 grades, the industrial -40 C to +85 C variant (PIC16C622A-04I/SO) extends the operating envelope to most cabin and trunk locations. Brown-out reset protects against cranking voltage drops down to 6 V on a 12 V system, and the on-chip watchdog recovers the MCU from firmware lockup caused by ESD or load-dump transients. Automotive designs needing CAN bus should step up to the PIC18F family with ECAN peripherals.
Recommended
Small Stepper and DC Motor Driver
Stepper motor indexers and brushed DC motor speed controllers map cleanly onto the PIC16C622A-20/SO: four GPIO drive a unipolar stepper through Darlington drivers, while the WDT guards against missed step detection. The 20 MHz CPU updates the commutation table at rates above 10 kHz, sufficient for vibration-free microstepping at low RPM. For DC motors, a single PWM output (software-generated) drives a logic-level MOSFET through a gate resistor, and the analog comparators implement current-limit sensing across a shunt resistor without an external op-amp. The 3.5 KB OTP holds full step-pattern tables for two stack configurations, and the 18-pin SOIC package keeps the controller footprint under 80 mm squared for tight motor-PCB integration.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-20/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20/SO | PIC16C622A-04/SO | PIC16C622A-04I/SO | PIC16C621A-20/SO | PIC16C620A-20/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin SOIC | 18-pin SOIC - same | 18-pin SOIC - same | 18-pin SOIC - same | 18-pin SOIC - same | 18-pin SOIC - same |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB OTP | 0.875 KB OTP |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 80 bytes | 80 bytes |
| Analog Comparators | 2 | 2 | 2 | 2 | 1 | 0 |
| Operating Temperature | 0 C to +70 C (Commercial) | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (Industrial) | 0 C to +70 C | 0 C to +70 C |
| 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 |
Key Differentiators
- On-chip analog comparators with programmable reference (vs PIC16C620A-20/SO)
- Full 3.5 KB program memory headroom (vs PIC16C621A-20/SO)
- 20 MHz CPU speed grade for time-critical control loops (vs PIC16C622A-04/SO)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin (pin 14) and a bulk 10 uF aluminum or tantalum capacitor on the same supply trace. The PIC16C622A-20/SO does not require separate analog and digital supply pins, but routing the comparator reference divider from a quiet VDD node improves threshold stability. For battery-powered designs, use the internal 4 MHz RC oscillator to eliminate the external resonator current draw during sleep. Source: Microchip PIC16C62X datasheet section on power supply design.
Estimated: with a 25 mA per-pin sink and 18-pin SOIC thermal pad layout of approximately 70 C/W theta_JA on a 2-layer 1 oz copper board, continuous switching of one output at 25 mA yields a junction-temperature rise of only 4-5 C above ambient. Layout the SOIC footprint to the standard JEDEC SO-18 1.27 mm pitch land pattern and avoid routing high-current traces beneath the IC to keep ground bounce below 100 mV. Source: Microchip SOIC-18 land pattern reference.
Do not leave MCLR/VPP floating; tie it to VDD through a 10 kohm resistor and add a 100 nF capacitor to ground to filter ESD transients. The PIC16C622A-20/SO is OTP - once programmed it cannot be erased, so keep engineering samples on the JW windowed package for code iteration and only commit to OTP for production. Watchdog timer must be cleared inside a 200 ns safe window; firmware that blocks on long delays can trigger WDT reset and corrupt GPIO states if interrupts are misconfigured.
Compliance Information
RoHS, lead-free, halogen-free, REACH, and conflict-mineral declarations were not present in the verified web data; values are set to unknown. Request the latest material declaration from Microchip support for volume commitment.
