PIC16C622T-20I/SO - 8-bit OTP MCU 3.5KB 20MHz 18-SOIC
MPN: PIC16C622T-20I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.25 | $5.25 |
| 10 | $4.68 | $46.80 |
| 100 | $3.94 | $394.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $2.99 | $2,990.00 |
PIC16C622T-20I/SO Overview
Background: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, RAM, and peripherals (I/O, timers, interrupts, communication interfaces) into one package. The PIC16C6x family is built on Microchip's RISC-based 8-bit PIC architecture with a 14-bit instruction word, separating it from the PIC16F (flash) and PIC16C (OTP/EPROM/ROM) lineages. MCUs in this class are widely used as the lowest-cost embedded controllers in cost-sensitive industrial, consumer, and automotive-body products.
Key features of the PIC16C622T-20I/SO include a precision analog comparator, one 8-bit timer (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, an internal MCLR reset path, a 4 MHz internal RC oscillator option, and an enhanced capture/compare/PWM (CCP) peripheral. The device provides 13 bidirectional I/O pins with high-current sink/source, plus power-on reset (POR), brown-out reset, and in-circuit serial programming (ICSP) capability through two pins.
Technically, the PIC16C622 implements a Harvard architecture with separate program and data buses, a 14-bit instruction set, and a 35-instruction RISC core. Its 2-stage instruction pipeline delivers 5 MIPS at 20 MHz. Operating from 2.5V to 6.0V across the full industrial temperature range, the device is suitable for battery- and line-powered designs alike, and the OTP memory allows one-time factory or production programming.
Typical applications include appliance controllers, security-system keypads, motor-control front-ends, low-end instrumentation, and battery-powered sensor interfaces. The on-chip analog comparator and CCP peripheral also suit closed-loop fan, pump, and solenoid drivers.
Designers should plan for the one-time-programmable memory model: code is locked at production programming and cannot be firmware-updated in-circuit beyond ICSP. Always reserve an I/O pin pair for ICSP, and verify retention/longevity assumptions for OTP programming windows on each batch.
This page consolidates current distributor pricing, package-level cross-references, and engineering design notes that go beyond what the manufacturer datasheet alone exposes, giving procurement and design engineers a single reference point.
Drop-in alternatives for PIC16C622T-20I/SO — 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 PIC16C622T-20I/SO (same form factor and footprint) — differing in RoHS Status, Program Memory Size, Timers, RAM Size, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622T-04I/SO
✅ Drop-In✓ In Stock
$2.06 / Unit
View Datasheet →PIC16C622T-04E/SO
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →PIC16C622T-20E/SO
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →PIC16C621T-20I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C621T-04I/SO
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC16C620-20/SO
✅ Drop-In✓ In Stock
$2.52 / Unit
PIC16C622T-20I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC, 14-bit instruction word |
| Program Memory | 3.5 KB (2K x 14) OTP |
| RAM | 128 bytes |
| Data EEPROM | Not present (ROM-less for data) |
| I/O Pins | 13 |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle | 200 ns (1/4 Fosc) |
| Supply Voltage (Vdd) | 2.5 V to 6.0 V |
| Operating Temperature | -40C to +85C (Industrial, "I") |
| Package | 18-SOIC (0.295", 7.50 mm width) |
| Mounting Type | Surface Mount |
| Timers | TMR0 8-bit + WDT with dedicated RC |
| Analog Comparator | Yes (on-chip) |
| CCP Module | 1 (Capture/Compare/PWM) |
| Brown-out Reset | Yes |
| ICSP (In-Circuit Serial Programming) | Yes (2-wire) |
| Internal RC Oscillator | 4 MHz nominal |
| Packaging | Tape & Reel ("T" suffix) |
| RoHS Status | See manufacturer product page |
PIC16C622T-20I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 / analog comparator output |
| Pin 2 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 3 | RA1 — Bidirectional I/O port A bit 1 |
| Pin 4 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 5 | RA4/T0CKI — Bidirectional I/O port A bit 4 / TMR0 clock input |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6/PGC — Bidirectional I/O port B bit 6 / ICSP clock |
| Pin 13 | RB7/PGD — Bidirectional I/O port B bit 7 / ICSP data |
| Pin 14 | VSS — Ground reference |
| Pin 15 | MCLR/VPP — Master clear reset input / programming voltage |
| Pin 16 | OSC1 — Oscillator crystal input / external clock input |
| Pin 17 | OSC2 — Oscillator crystal output |
| Pin 18 | VDD — Positive supply voltage (2.5V to 6.0V) |
Typical Applications
PIC16C622T-20I/SO is suitable for 6 applications: Appliance Control Board, Security Keypad / Access Panel, Battery-Powered Sensor Interface, Motor and Solenoid Driver Front-End, Low-End Instrumentation Front Panel, Automotive Body and Comfort Module.
Appliance Control Board
The PIC16C622T-20I/SO fits appliance control boards because it integrates an analog comparator, 8-bit TMR0, and one CCP/PWM channel in an 18-SOIC package that is straightforward to hand-solder or auto-place. At 20 MHz the core delivers 5 MIPS, enough to run brushed-motor PWM at typical 8 to 25 kHz while servicing a button matrix and LED indicators. The 2.5V to 6.0V Vdd range simplifies dropping in either a 3.3V or 5V regulator, and the on-chip brown-out reset prevents latch-up during brown-out events on cheap rectified mains supplies. For laundry, dishwashers, and microwave keypads this part remains a cost-effective controller.
Recommended
Security Keypad / Access Panel
For security keypads and access panels, the PIC16C622T-20I/SO provides 13 I/O pins which is sufficient to scan a 4x4 matrix plus drive a piezo buzzer and a status LED, while the on-chip comparator can be used for tamper detection on the panel itself. The OTP program memory prevents reverse-engineering of credential logic. Industrial -40C to +85C temperature grade supports outdoor and unconditioned enclosure installs. The ICSP two-wire programming interface allows firmware to be loaded after conformal coating using header clips, useful for production re-flash and calibration.
Recommended
Battery-Powered Sensor Interface
Battery-powered sensor interfaces benefit from the PIC16C622T-20I/SO because its 2.5V minimum Vdd supports single-cell lithium or two-AA supplies, and the brown-out reset threshold keeps the device in a defined state as the cells deplete. The on-chip analog comparator can wake the MCU from sleep on threshold-crossing events, and TMR0 can be used for periodic sensor sampling without external RTC hardware. 3.5KB of OTP is enough for typical sensor-conditioning and LoRa/wired-modem sub-protocol stacks, and the SOIC-18 footprint is friendly to miniaturized sensor modules.
Recommended
Motor and Solenoid Driver Front-End
In motor and solenoid front-ends, the PIC16C622T-20I/SO serves as a low-side PWM controller and current-sense decision-maker. Its CCP module generates a hardware PWM up to the MCU's full 20 MHz instruction rate, and the analog comparator compares a shunt-amplified sense signal to a DAC threshold for overcurrent protection. The 13 I/O lines can drive direction logic, brake input, and a fault-indicator LED without external logic. Industrial -40C to +85C rating supports fan, pump, and solenoid-driver environments including HVAC actuators.
Recommended
Low-End Instrumentation Front Panel
The PIC16C622T-20I/SO suits a low-end bench instrument's front panel: the 13 I/O pins multiplex a 4-digit 7-segment display with a rotary encoder, and the on-chip comparator serves as a fast overrange-detect for the analog measurement chain. At 5 MIPS the controller can debounce keys, refresh the display, and service a UART link to the main instrument CPU without timing stress. 128 bytes of RAM is enough for a small command queue and the 3.5KB OTP image can hold the panel's UI state machine.
Recommended
Automotive Body and Comfort Module
In automotive body and comfort modules (window lifters, mirror adjusters, interior lighting), the PIC16C622T-20I/SO operates at 5V from a regulated VBAT supply, where its industrial -40C to +85C temperature grade handles cabin electronics. Its on-chip comparator and CCP module support PWM-driven mirror motors and LED dimming, while brown-out reset protects against load-dump transients. The 18-SOIC wide-body is well suited to wave-soldered automotive sub-assemblies. For under-hood AEC-Q100 environments, however, migrate to a PIC16F or PIC18 automotive-grade part.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-20I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622T-04I/SO | PIC16C622T-04E/SO | PIC16C622T-20E/SO | PIC16C621T-20I/SO | PIC16C621T-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.295") | 18-SOIC (0.295") - same | 18-SOIC (0.295") - same | 18-SOIC (0.295") - same | 18-SOIC (0.295") - same | 18-SOIC (0.295") - same |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP - same | 3.5 KB OTP - same | 3.5 KB OTP - same | Less (PIC16C621 die) | Less (PIC16C621 die) |
| Max Clock | 20 MHz | 4 MHz (-80%) | 4 MHz (-80%) | 20 MHz - same | 20 MHz - same | 4 MHz (-80%) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial - same | Extended | Extended | Industrial - same | Industrial - same |
| I/O Pins | 13 | 13 - same | 13 - same | 13 - same | 13 - same | 13 - same |
| ADC | None | None | None | None | None | None |
| Comparator | Yes | Yes | Yes | Yes | Yes | Yes |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- Lower-temperature grade at same 20 MHz speed (vs PIC16C622T-20E/SO)
- Higher 20 MHz rated speed vs 04 MHz variant (vs PIC16C622T-04I/SO)
- Full PIC16C622 peripheral set (CCP + comparator + 4 MHz INTOSC) (vs PIC16C621T-20I/SO)
Design Notes
Power the PIC16C622T-20I/SO from a regulated rail of 2.5 V to 6.0 V; place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a bulk 10 uF tantalum or ceramic on the same node. Brown-out reset triggers below the configured threshold, so choose the BOR voltage setting (BOREN bit) appropriate for the application's minimum safe supply. For battery-powered designs, leverage the internal 4 MHz RC oscillator with the LP oscillator option below 200 kHz to reduce current draw during sleep intervals.
Do not assume firmware can be reflashed on the fly. The PIC16C622T-20I/SO uses OTP (one-time-programmable) memory, which can only be written once. For prototyping, order a windowed (JW) package or use a PIC16F equivalent in the same SOIC-18 footprint to retain flash re-programmability during firmware bring-up. Production code images must be locked and verified; there is no second chance.
Reserve RB6 (PGC) and RB7 (PGD) as ICSP pins even in production layouts; never hard-tie these to ground or power because the ICSP programmer drives these lines during programming. Keep the MCLR/VPP trace short and avoid putting more than 1 nF of capacitance on MCLR, as the programming voltage rises quickly and excessive capacitance can prevent ICSP from latching. Place the crystal or resonator within 5 mm of OSC1/OSC2 with short, symmetric traces and a ground guard ring for noise immunity.
Compliance Information
Compliance status not explicitly stated in the provided data. Confirm RoHS/REACH/lead-free status with Microchip's product page or material declaration for the specific lot date code before placing production orders.
