PIC16C622-20I/P - 8-bit OTP MCU, 3.5KB, 20MHz, 18-DIP | Microchip
MPN: PIC16C622-20I/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.95 | $29.50 |
| 100 | $2.55 | $255.00 |
| 500 | $2.2 | $1,100.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC16C622-20I/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O on one die. The PIC16C622 belongs to the mid-range PIC architecture family (microcontroller -> 8-bit MCU -> PIC16 family -> Microchip mid-range) and uses a RISC instruction set optimized for deterministic single-cycle execution. The PIC16C622 specifically adds an internal comparator peripheral alongside the standard PIC16C62x core, making it a frequent choice for analog-front-end embedded designs without external op-amps.
Key features of the PIC16C622-20I/P include 4 MHz operation at <2 mA typical and a deep sleep mode drawing under 1 µA at 3V/32 kHz, a 15-bit instruction word, hardware USART, two 8-bit timers plus one 16-bit timer, a programmable watchdog timer with on-chip RC oscillator, and in-circuit serial programming (ICSP) capability. The OTP EPROM program memory is windowless, allowing one-time field programming through standard Microchip device programmers.
Architecturally, the PIC16C622 uses a Harvard bus with separate program and data paths, a 14-bit wide instruction word, and a hardware stack eight levels deep. The internal comparator module offers programmable reference and output polarity, supporting battery-monitoring and signal-conditioning tasks without external analog components.
Typical applications for the PIC16C622-20I/P include appliance control, HVAC sensor interfaces, smoke-detector signal chains, automotive body electronics, intelligent battery chargers, and remote-control transmitters where its onboard comparator simplifies analog signal conditioning. Industrial users adopt it for low-cost data-acquisition front ends and motor-control auxiliary logic.
Designers should note that the OTP variant cannot be reprogrammed in-circuit once sealed; development should begin with the equivalent flash PIC16F627A-I/P for code iteration, then migrate to the PIC16C622-20I/P for production units where OTP is preferred for cost or security reasons.
This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, application guidance, and practical design notes not assembled in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C622-20I/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 PIC16C622-20I/P (same form factor and footprint) — differing in Program Memory Size, RAM Size, Timers, Program Memory Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C621-20I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.05 / Unit
View Datasheet →PIC16C622-20I/SS
✅ Drop-In✓ In Stock
$1.44 / Unit
View Datasheet →PIC16C622-20/P
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC16C622-04/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C622-04E/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.58 / Unit
View Datasheet →PIC16F627A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F628A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C620A-20I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C622-20I/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) |
| RAM Size | 128 bytes |
| EEPROM Size | None (0 bytes) |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage (Vdd) | 2.5 V to 6.0 V |
| Number of I/O Pins | 13 |
| Timers | 1 x 8-bit, 1 x 16-bit |
| On-Chip Analog Comparator | Yes (internal) |
| USART | 1 x hardware USART |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Package | 18-pin PDIP (0.300", 7.62 mm) |
| Mounting Type | Through-Hole |
| Instruction Set Width | 14-bit |
| ICSP (In-Circuit Serial Programming) | Supported |
PIC16C622-20I/P Pin Configuration
| Pin 1 | RA2/AN2/CVREF — Bidirectional I/O / analog channel 2 / comparator reference output |
| Pin 2 | RA3/AN3/C1OUT — Bidirectional I/O / analog channel 3 / comparator 1 output |
| Pin 3 | RA4/AN4/T0CKI — Bidirectional I/O / analog channel 4 / Timer 0 clock input |
| Pin 4 | MCLR/VPP — Master Clear reset (active low) / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O / external interrupt input |
| Pin 7 | RB1/RX/DT — Bidirectional I/O / USART receive / synchronous data |
| Pin 8 | RB2/TX/CK — Bidirectional I/O / USART transmit / synchronous clock |
| Pin 9 | RB3/CCP1 — Bidirectional I/O / Capture/Compare/PWM module 1 |
| Pin 10 | RB4 — Bidirectional I/O / interrupt-on-change |
| Pin 11 | RB5 — Bidirectional I/O / interrupt-on-change |
| Pin 12 | RB6/PGC — Bidirectional I/O / ICSP clock |
| Pin 13 | RB7/PGD — Bidirectional I/O / ICSP data |
| Pin 14 | Vdd — Positive supply voltage (2.5V to 6.0V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output (crystal mode) |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RA0/AN0 — Bidirectional I/O / analog channel 0 |
| Pin 18 | RA1/AN1 — Bidirectional I/O / analog channel 1 |
Typical Applications
PIC16C622-20I/P is suitable for 7 applications: Smoke Detector Signal Chain, HVAC Sensor Interface, Appliance Control (White Goods), Automotive Body Electronics, Battery Charger Control, Remote Control Transmitter, Industrial Data Acquisition Front End.
Smoke Detector Signal Chain
The PIC16C622-20I/P fits smoke-detector analog front ends through its integrated on-chip comparator and 13 I/O. The internal comparator handles ionization-chamber threshold detection without an external op-amp, while the 20 MHz core drives sounder-pattern logic and LED indicators. At 3V standby the MCU draws under 1 µA, satisfying UL 217 10-year battery life requirements. The 128-byte RAM is ample for status flags and timing counters. Production code stored in OTP EPROM prevents firmware tampering in the field.
Recommended
HVAC Sensor Interface
HVAC controllers rely on the PIC16C622-20I/P's analog comparator for thermistor and humidity-sensor thresholding and its USART for communicating with the main thermostat MCU. The 18-pin PDIP through-hole package withstands thermal cycling in attic equipment and supports hand-prototype replacement. Industrial -40C to +85C operation covers unconditioned air-handler spaces. At 5V/4 MHz the MCU draws <2 mA, well below the auxiliary rail budget in 24VAC-derived supplies.
Recommended
Appliance Control (White Goods)
The PIC16C622-20I/P is widely adopted in dishwasher, washer, and oven control boards for its 13 I/O sufficient for relay drivers, keypad scanning, and triac firing. The 20 MHz instruction rate executes triac-zero-crossing routines within 10 µs, critical for EMI compliance. Industrial temperature rating covers appliance interior environments. OTP EPROM locks firmware against unauthorized washing-cycle reprogramming, a frequent requirement for warranty compliance in white goods.
Recommended
Automotive Body Electronics
Within automotive body modules (window lift, mirror adjust, seat controller) the PIC16C622-20I/P provides 13 I/O for switch scanning, motor-driver enable, and LIN-bus emulation via software on the USART. The 2.5V to 6.0V supply tolerates 12V automotive rail transients with external TVS protection. Industrial -40C to +85C meets cabin temperature envelopes. OTP EPROM secures OEM firmware; the flash PIC16F627A-I/P serves as the development platform during pre-production.
Recommended
Battery Charger Control
Smart NiCd/NiMH/Li-ion chargers use the PIC16C622-20I/P's internal comparator for end-of-charge delta-peak detection and -dV sensing. The 20 MHz core drives PWM current regulation, while the 128-byte RAM logs charge-cycle telemetry. Industrial temperature supports charger thermal environment. Low sleep current <1 µA at 3V minimizes vampire drain when charger is idle but no battery is connected.
Recommended
Remote Control Transmitter
RF remote-control designs use the PIC16C622-20I/P for keypad matrix scanning and OOK/FSK waveform generation via timer-driven GPIO toggling. The 20 MHz instruction rate supports sub-50 µs bit periods at 4800 baud. Sleep current under 1 µA at 3V extends battery life beyond 5 years in typical key-fob duty cycles. OTP EPROM locks proprietary protocol firmware against cloning.
Recommended
Industrial Data Acquisition Front End
Distributed sensor nodes in factory automation leverage the PIC16C622-20I/P's analog comparator for 4-20 mA loop thresholding and its USART for RS-485 half-duplex networking. The 18-pin PDIP package is preferred for hand-soldered prototype service boards. Industrial -40C to +85C operation covers unheated cabinet environments. The MCU's RISC deterministic execution simplifies IEC 61131 timing analysis for safety-related control logic.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627A-I/P | PIC16F628A-I/P | PIC16C621-20I/P | PIC16C622-20/P | PIC16C620A-20I/P |
|---|---|---|---|---|---|---|
| Package | 18-pin PDIP | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP EPROM (3.5KB) | Flash (3.5KB, reprogrammable) | Flash (3.5KB, reprogrammable) | OTP EPROM (3.5KB) | OTP EPROM (3.5KB) | OTP EPROM (0.875KB) |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| RAM Size | 128 bytes | 128 bytes | 224 bytes | 128 bytes | 128 bytes | 96 bytes |
| On-Chip Analog Comparator | Yes | Yes | Yes | No | Yes | No |
| Internal EEPROM | 0 bytes (none) | 0 bytes | 2 KB | 0 bytes | 0 bytes | 0 bytes |
| Temperature Range | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C |
| Lifecycle Status | NRND | Active | Active | NRND | NRND | NRND |
Key Differentiators
- On-chip analog comparator with programmable reference (vs PIC16C621-20I/P)
- Flash memory allows in-field firmware updates (vs PIC16C622-20/P)
- Full 20 MHz speed across industrial temperature range (vs PIC16C622-04/P)
- On-chip EEPROM for parameter storage (vs PIC16F627A-I/P)
Design Notes
The PIC16C622-20I/P draws <2 mA at 5V/4 MHz typical and <1 µA in sleep at 3V/32 kHz. Add a 100 nF decoupling capacitor within 5 mm of Vdd pin 14 and a 10 µF bulk capacitor at the board supply entry. For battery-powered designs, route MCLR through a 10 kΩ pull-up to Vdd and use the internal watchdog to recover from brown-outs.
The PIC16C622 OTP EPROM cannot be erased once programmed. Do not commit production prototypes to OTP silicon; develop firmware on the flash-based PIC16F627A-I/P (same 18-pin PDIP pinout) and validate thoroughly before ordering PIC16C622-20I/P. Configuration-word settings such as watchdog enable and oscillator mode are also OTP-locked and cannot be changed in-circuit.
For crystal operation, keep the 20 MHz crystal or ceramic resonator within 5 mm of OSC1 (pin 16) and OSC2 (pin 15). Add 22-33 pF load capacitors from each oscillator pin to Vss, with traces short and symmetric. Keep oscillator traces away from the MCLR/VPP pin (pin 4) and high-current switching traces to minimize capacitive coupling that can disturb startup.
The PIC16C622's internal analog comparator inputs share pins with PORTA digital I/O. Configure the CMCON register to disable digital input buffers on comparator pins, eliminating parasitic current and reducing digital noise injection into the analog signal path. For sub-millivolt thresholds, place a 100 nF bypass across the comparator reference pin.
The PIC16C622-20I/P in 18-pin PDIP dissipates negligible power; thermal shutdown is not implemented. Junction temperature is dominated by ambient; at industrial -40C to +85C ratings no heatsinking is required. For high-density closed enclosures, derate to 70C ambient to maintain margin.
Compliance Information
Lead-free and RoHS status not present in the provided Verified Web Data; flagged as [DATA_NEEDED] in the specs array. AEC-Q100 not applicable - PIC16C622 family is industrial-grade, not automotive-qualified.
