PIC16C622A-04I/SO - 8-Bit 4MHz OTP MCU 18-SOIC | Microchip
MPN: PIC16C622A-04I/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.26 | $4.26 |
| 10 | $3.84 | $38.40 |
| 100 | $3.41 | $341.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.72 | $2,720.00 |
PIC16C622A-04I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals. The PIC16C622A belongs to the mid-range 8-bit PICmicro family, sitting within Microchip's broader taxonomy of 8-bit microcontrollers -> microcontrollers -> embedded processors -> integrated circuits. Its RISC-style Harvard architecture with 35 single-cycle instructions simplifies firmware development while delivering deterministic real-time behavior suitable for low-power control loops.
Key features include an operating voltage range of 2.5 V to 5.5 V (industrial temperature -40 Β°C to +85 Β°C as denoted by the 'I' suffix), two 8-bit timers plus one 16-bit timer/counter with capture/compare/PWM capability, a USART/SCI serial port, an analog comparator, and a watchdog timer with on-chip RC oscillator for reliable operation. The PIC16C622A also provides a 4 MHz internal-execution rate from an external 4 MHz crystal, an 8-bit parallel slave port, and up to 13 bidirectional I/O pins with high-current sink/source capability.
Architecturally, the device uses a 14-bit wide program word with separate program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. The 4 MHz oscillator combined with a 4:1 instruction-pipeline divider delivers a 1 Β΅s single-cycle instruction time (200 ns cycle at 20 MHz), while the on-chip Power-on Reset, Brown-out Reset, and Watchdog Timer provide robust field-deployment reliability.
Typical applications include consumer appliance control, security system panels, automotive body modules, industrial sensor interfaces, low-cost remote controls, and small-form-factor motor-driver front-ends. The wide operating voltage and industrial temperature range also suit battery-powered instrumentation and HVAC peripheral controllers.
When designing with this part, note that OTP memory cannot be re-programmed in-circuit; for development or low-volume production, choose a Flash-based equivalent such as PIC16F627A or PIC16F628A in the same 18-pin SOIC footprint to reuse PCB layout and firmware libraries.
This page synthesizes distributor stock and pricing, drop-in same-package alternatives from Microchip's PIC16C family, and practical design notes beyond the manufacturer datasheet - supporting faster sourcing decisions for engineering and procurement teams.
Drop-in alternatives for PIC16C622A-04I/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-04I/SO (same form factor and footprint) β differing in Peripherals, Program Memory Type, Mounting Type, Program Memory Size, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F628A-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F627A-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C622A-04E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C621A-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C620A-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C622A-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Frequency | 4 MHz |
| Instruction Cycle Time | 1 Β΅s at 4 MHz |
| Number of I/O Pins | 13 |
| Timers | 2 x 8-bit, 1 x 16-bit CCP |
| Communication Interfaces | SCI/USART |
| Peripherals | Brown-out Reset, Watchdog Timer, Analog Comparator, Parallel Slave Port |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | -40 Β°C to +85 Β°C (Industrial) |
| Package | 18-SOIC (7.50 mm body width) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16C622A-04I/SO Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O pin (Port A bit 2) |
| Pin 2 | RA3 β Bidirectional I/O pin (Port A bit 3) |
| Pin 3 | RA4/T0CKI β Bidirectional I/O / Timer0 clock input |
| Pin 4 | MCLR/VPP β Master Clear (Reset) input / Programming voltage |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Bidirectional I/O / External interrupt input |
| Pin 7 | RB1 β Bidirectional I/O pin (Port B bit 1) |
| Pin 8 | RB2 β Bidirectional I/O pin (Port B bit 2) |
| Pin 9 | RB3 β Bidirectional I/O pin (Port B bit 3) |
| Pin 10 | RB4 β Bidirectional I/O pin (Port B bit 4, interrupt-on-change) |
| Pin 11 | RB5 β Bidirectional I/O pin (Port B bit 5, interrupt-on-change) |
| Pin 12 | RB6 β Bidirectional I/O / ICSP clock (interrupt-on-change) |
| Pin 13 | RB7 β Bidirectional I/O / ICSP data (interrupt-on-change) |
| Pin 14 | VDD β Positive supply voltage (2.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT β Oscillator output / Clock output |
| Pin 16 | OSC1/CLKIN β Oscillator input / External clock input |
| Pin 17 | RA0/AN0 β Bidirectional I/O / Analog comparator input 0 |
| Pin 18 | RA1/AN1 β Bidirectional I/O / Analog comparator input 1 |
Typical Applications
PIC16C622A-04I/SO is suitable for 6 applications: Consumer Appliance Control, Security System Panels, Automotive Body Modules, Industrial Sensor Interfaces, Low-Cost Remote Controls, HVAC Peripheral Controllers.
Consumer Appliance Control
The PIC16C622A-04I/SO fits consumer appliance front-panel controllers (washing machines, microwave ovens, dishwasher HMI boards) because its 4 MHz CPU delivers a 1 Β΅s instruction cycle that is fast enough for button-debounce loops, 7-segment multiplex, and triac phase-control timing in real time. The 3.5 KB OTP holds typical appliance state machines, while the analog comparator enables zero-crossing detection for triac firing without extra hardware. With 13 I/O pins and 2.5 V to 5.5 V operation, the device interfaces directly to LED indicators, keypads, and relay drivers.
Recommended
Security System Panels
For burglar alarm control panels and PIR-motion-sensor interface boards, the PIC16C622A's 13 I/O pins directly scan 4 to 8 zone loops while its USART/SCI port talks to a central station dialer or keypad bus. The brown-out reset and watchdog timer with on-chip RC oscillator prevent lockups during power-line disturbances, and the analog comparator acts as a window discriminator for PIR signal conditioning. OTP memory prevents firmware tampering after deployment, a regulatory requirement in some security certifications.
Recommended
Automotive Body Modules
In automotive body-control applications such as lighting controllers, mirror adjusters, or seat-position modules, the PIC16C622A-04I/SO drives PWM outputs for lamp dimming via its 16-bit CCP timer at frequencies compatible with 100 Hz automotive lighting. The 2.5 V to 5.5 V supply range covers 5 V regulated body rails, and the analog comparator monitors battery voltage for load-dump detection. For under-hood or higher-temperature zones, migrate to PIC16C622A-04E/SO (-40 Β°C to +125 Β°C) without PCB changes.
Recommended
Industrial Sensor Interfaces
For 4-20 mA loop-powered sensor transmitters or thermocouple pre-digitizer boards, the PIC16C622A reads its analog comparator as a 1-bit sigma-delta modulator against a precision reference, while its USART outputs ASCII or Modbus frames to a host PLC. The 1 Β΅s instruction cycle supports bit-banging I2C master timing for EEPROM calibration storage. With 128 bytes RAM the device can buffer a 32-sample moving average without external memory, simplifying the analog signal chain.
Recommended
Low-Cost Remote Controls
Battery-powered IR or RF remote controls benefit from the PIC16C622A's 2.5 V minimum supply (compatible with two alkaline cells) and its analog comparator waking the CPU only when a button is pressed. The USART or bit-banged PWM generates 38 kHz carrier for IR transmission, and the 3.5 KB OTP holds large code-book libraries for multi-device universal remotes. Industrial -40 Β°C to +85 Β°C rating survives garage-door or outdoor keypad environments.
Recommended
HVAC Peripheral Controllers
The PIC16C622A-04I/SO serves as a fan-speed or damper-controller slave in HVAC systems, using the 16-bit CCP timer to generate variable-frequency PWM for brushless DC fan drivers while the analog comparator senses zero-crossing for triac-based line-voltage control. The watchdog timer and brown-out reset ensure recovery from compressor switching transients on the supply rail. With industrial temperature rating, the part operates in attic or basement equipment closets reliably.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-04I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F628A-I/SO | PIC16F627A-I/SO | PIC16C622A-04E/SO | PIC16C621A-04I/SO | PIC16C620A-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Program Memory Type | OTP (3.5 KB) | Flash (3.5 KB) | Flash (1.75 KB) | OTP (3.5 KB) | OTP (2 KB) | OTP (0.875 KB) |
| Maximum CPU Frequency | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz |
| Data RAM | 128 bytes | 224 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Operating Temperature | -40 Β°C to +85 Β°C | -40 Β°C to +85 Β°C | -40 Β°C to +85 Β°C | -40 Β°C to +125 Β°C | -40 Β°C to +85 Β°C | -40 Β°C to +85 Β°C |
| USART | Yes | Yes | Yes | Yes | Yes | No |
| Lifecycle Status | NRND | Active | Active | NRND | NRND | NRND |
Key Differentiators
- Drop-in compatible with Flash-based PIC16F628A-I/SO for future-proofing (vs PIC16F628A-I/SO)
- Larger program memory than PIC16C621A-04I/SO for code-intensive tasks (vs PIC16C621A-04I/SO)
- Industrial temperature range optimized for standard embedded environments (vs PIC16C622A-04E/SO)
Design Notes
The PIC16C622A-04I/SO operates from 2.5 V to 5.5 V; bulk-decouple VDD (pin 14) and VSS (pin 5) with a 100 nF ceramic capacitor placed within 5 mm of the supply pins, plus a 10 Β΅F tantalum or aluminum electrolytic on the board power entry. Add a 1 kΞ© pull-up on MCLR/VPP (pin 4) for normal operation; the internal brown-out reset triggers at ~4.0 V on a 5 V rail, ensuring predictable reset behavior during supply droops.
Place the 4 MHz crystal (or ceramic resonator) within 10 mm of OSC1 (pin 16) and OSC2 (pin 15), with short traces and a ground guard ring to minimize EMI. For HS crystal mode, add 15-33 pF load capacitors per crystal datasheet. The ICSP pins RB6 (pin 12) and RB7 (pin 13) should remain accessible for in-system programming; do not load them with heavy capacitance (>50 pF) that prevents debugger handshaking.
OTP memory can be programmed only once - verify firmware with a windowed or Flash equivalent (PIC16F627A/628A) before committing to production programming. Configuration bits must be set explicitly: disable the watchdog timer (WDTE=0) if not used, set oscillator mode (FOSC) to XT for 4 MHz crystal, and enable the power-on timer (PWRTE=1) for slow-rising supplies. Unused I/O pins must be configured as outputs and tied low to minimize current draw.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - automotive designs should verify supplier documentation or choose AEC-Q100 qualified Flash-based equivalents.
