PIC16C622-20I/SO - 8-bit OTP MCU, 3.5KB, 20MHz SOIC-18 | Microchip
MPN: PIC16C622-20I/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.42 | $34.20 |
| 100 | $2.95 | $295.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.2 | $2,200.00 |
PIC16C622-20I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral communications into one IC. MCUs form the lowest tier of embedded computing hierarchy: MCU -> embedded processor -> microprocessor -> digital IC -> semiconductor. The PIC16C62X family uses a RISC architecture with a single accumulator (W register) and Harvard program/data bus split, which allows the CPU to fetch instructions and data in parallel - doubling throughput at a given clock rate versus von Neumann machines.
Key features of the PIC16C622-20I/SO include two 8-bit timer/counters (Timer0 and Timer2), one 16-bit timer/counter (Timer1), a capture/compare/PWM module, a USART serial port, an analog comparator with two inputs, and a watchdog timer with on-chip RC oscillator. The OTP EPROM program memory supports up to 100 erase/write cycles and retains code for over 40 years per Microchip datasheet 30235j. Power consumption is 15 uA typical at 5V/4MHz and 1 uA typical at 3V/32kHz, making the part suitable for low-power and battery applications.
Architecturally, the PIC16C622 uses a 14-bit instruction word with a 35-instruction set and 8-level hardware stack, providing deterministic interrupt response critical for real-time control. The Harvard bus, RISC pipeline, and integrated analog peripherals reduce external component count and BOM cost for embedded designs.
Typical applications include motor control, remote-control transmitters, security and alarm systems, consumer appliances, and industrial sensor interface boards. The two built-in analog comparators enable direct interfacing with analog sensors such as thermistors, photocells, and bridge transducers without external op-amps.
When designing with this part, ensure the supply voltage stays within 2.5V to 6.0V and that the MCLR reset circuit (typical 10k pull-up to VDD) is implemented per the datasheet. Industrial temperature grade means -40C to +85C operation, which is the standard factory/automotive-under-hood limit; for full AEC-Q100 qualification a different part number is required.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C622-20I/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 PIC16C622-20I/SO (same form factor and footprint) β differing in Program Memory Size, RAM Size, Core Architecture, Operating Temperature, Package.
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Request AlternativesPIC16C622-20I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (PIC16C) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| EEPROM Size | None |
| Maximum Clock Frequency | 20 MHz |
| Operating Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 13 |
| Timers | 1 x 8-bit, 1 x 16-bit (Timer1), 1 x 8-bit (Timer2) |
| Analog Comparators | 2 |
| Serial Interface | USART (SCI) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Instruction Set | 35 instructions, 14-bit word |
| Package | SOIC-18 (SO), 7.3 mm wide |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| Supply Current (5V, 4MHz) | 15 uA typical |
| Supply Current (3V, 32kHz) | 1 uA typical |
PIC16C622-20I/SO Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / analog comparator input 2 |
| Pin 2 | RA3/AN3 β PORTA bit 3 / analog comparator input 3 |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input |
| Pin 4 | RA5/MCLR β PORTA bit 5 / Master Clear (reset) input |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β PORTB bit 0 / external interrupt input |
| 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 voltage |
| Pin 15 | OSC2/CLKOUT β Oscillator crystal output / clock out |
| Pin 16 | OSC1/CLKIN β Oscillator crystal input / external clock in |
| Pin 17 | RA0/AN0 β PORTA bit 0 / analog comparator input 0 |
| Pin 18 | RA1/AN1 β PORTA bit 1 / analog comparator input 1 |
Typical Applications
PIC16C622-20I/SO is suitable for 6 applications: Industrial Sensor Interface Board, Remote Control Transmitter, Security and Alarm System, Consumer Appliance Controller, Motor Control (Small DC and Stepper), Battery-Powered Wireless Sensor Node.
Industrial Sensor Interface Board
The PIC16C622-20I/SO is well suited for industrial sensor interface boards thanks to its two built-in analog comparators and 13 digital I/O pins. The comparators directly accept signals from thermistors, photocells, and bridge sensors without external op-amps, reducing BOM count and PCB area. At 20 MHz the MCU provides 5 MIPS, enabling real-time threshold detection and digital filtering for factory automation. Industrial -40C to +85C temperature grade allows deployment in factory floors and outdoor enclosures.
Recommended
Remote Control Transmitter
The PIC16C622-20I/SO is a proven platform for handheld remote control transmitters where 3.5 KB OTP suffices for keypad encoding, rolling-code security, and IR/RF transmission routines. Its low 15 uA typical supply current at 5V/4MHz extends battery life, and the 1 uA typical current at 3V/32kHz watch mode enables multi-year coin-cell operation. The 18-pin SOIC footprint fits compact handheld enclosures, and the USART supports serial communication with RF modules.
Recommended
Security and Alarm System
The PIC16C622-20I/SO fits security and alarm panels where deterministic interrupt response is critical. The 8-level hardware stack and single-cycle instructions provide predictable response to PIR sensor, reed switch, and keypad inputs. The watchdog timer with on-chip RC oscillator guards against code runaway and lockup. Industrial temperature operation ensures reliable performance in garage and basement installations, and the OTP memory prevents firmware tampering after deployment.
Recommended
Consumer Appliance Controller
Appliance controllers such as washing machines, dishwashers, and microwave ovens leverage the PIC16C622-20I/SO's 3.5 KB OTP to store user interface logic, sensor fusion, and motor drive routines. The CCP module generates PWM signals for motor speed control, and Timer1 provides precise interval timing for countdown timers. The 20 MHz clock and 5 MIPS throughput allow smooth multi-tasking between keypad scanning, display driving, and safety monitoring.
Recommended
Motor Control (Small DC and Stepper)
The PIC16C622-20I/SO drives small DC brushed motors and stepper motors in applications such as pumps, fans, and valve actuators. The CCP module provides hardware PWM generation, while Timer2 sets the PWM period. The 13 I/O pins are sufficient for H-bridge direction control, fault feedback, and tachometer input. Industrial temperature grade supports under-hood automotive environments and factory machinery.
Recommended
Battery-Powered Wireless Sensor Node
Battery-powered wireless sensor nodes benefit from the PIC16C622-20I/SO's 1 uA sleep current at 3V/32kHz, which enables multi-year battery life in remote installations. The 3.5 KB OTP stores sensor calibration, RF protocol stacks, and sleep/wake schedules. The USART interfaces directly with low-cost RF transceivers. Industrial temperature rating ensures operation across seasonal outdoor temperatures, and the small SOIC-18 footprint fits coin-cell-powered miniature sensor modules.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C621AT-20I/SO | PIC16C620A-20I/SO | PIC16F628A-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-18 | SOIC-18 - same | SOIC-18 - same | SOIC-18 - same |
| Program Memory | 3.5 KB OTP | 1.75 KB OTP | 0.5 KB OTP | 3.5 KB Flash |
| RAM Size | 128 bytes | 80 bytes | 80 bytes | 224 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 13 | 13 | 13 | 16 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Highest program memory in the PIC16C62X SOIC-18 family (vs PIC16C621AT-20I/SO)
- Modern flash-based successor with active lifecycle (vs PIC16F628A-I/SO)
- Two built-in analog comparators (vs PIC16C620-04I/P)
Design Notes
The PIC16C622-20I/SO requires a stable VDD supply between 2.5V and 6.0V. Place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a 10 uF bulk capacitor near the supply entry point. Use a low-ESR tantalum or ceramic capacitor. The MCLR pin requires a 10 kohm pull-up to VDD for reliable reset; a diode (1N4148) from VDD to MCLR prevents latch-up if VDD rises faster than MCLR.
Route the OSC1/OSC2 traces as short and symmetric as possible, surrounded by a ground guard ring, to avoid stray capacitance and noise injection on the crystal oscillator. If using a high-speed crystal (>16 MHz), a series resistor (50-100 ohm) on OSC2 damps reflections. For low-EMI applications, switch from high-speed crystal to the internal 4 MHz RC oscillator mode (configuration bit FOSC1:FOSC0).
Because OTP EPROM cannot be erased, every code revision during development requires a new chip unless a windowed CERDIP package is used. Do not leave MCLR floating - a floating MCLR pin causes intermittent resets and unpredictable behavior. The analog comparator inputs (RA0-RA3) should not exceed VDD; driving these above VDD with a low-impedance source can damage the ESD protection diodes. Configure unused I/O pins as outputs low to minimize current draw.
Estimated: At maximum activity (5V, 20 MHz, all peripherals on), supply current is approximately 15 mA, giving power dissipation P = 5 V x 15 mA = 75 mW in the SOIC-18 package. With typical SOIC-18 theta_JA of ~85 C/W (4-layer JEDEC board), junction temperature rise is approximately 6 C above ambient, well within the -40C to +85C industrial range. No heatsink required for normal operation.
Compliance Information
Lifecycle obsolete. RoHS/REACH/lead-free status not confirmed in available datasheet; verify with manufacturer declaration before RoHS-restricted deployment.
