PIC16C622A-40/SS - 8-Bit CMOS OTP MCU, 3.5KB, 40MHz | Microchip
MPN: PIC16C622A-40/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.41 | $141.00 |
| 500 | $1.24 | $620.00 |
| 1,000 | $1.08 | $1,080.00 |
PIC16C622A-40/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and integrated peripherals such as comparators, timers, and I/O ports. The PIC16C622A belongs to the mid-range PICmicro family and uses a Harvard architecture with separate program and data buses, providing deterministic instruction timing that simplifies real-time control design. OTP MCUs sit in the product hierarchy as: PIC16C62x series -> mid-range PICmicro -> 8-bit PIC MCU -> microcontroller -> semiconductor.
Key features of the PIC16C622A include two on-chip analog comparators with programmable reference voltage, a 16-bit timer/counter (TMR1), an 8-bit timer/counter (TMR0) with programmable prescaler, a Watchdog Timer with its own on-chip RC oscillator, and Power-on Reset / Brown-out Reset circuitry. The two comparators enable direct interface with analog signals without an external op-amp, making the part well-suited to sensor-conditioning and threshold-detection front ends.
Architecturally, the PIC16C622A implements a 14-bit instruction word and a separate 8-bit data path. The OTP program memory is programmed once and cannot be erased, so this part is intended for volume production rather than prototyping (where Flash-based PIC16F equivalents are preferred). The SSOP-20 footprint also supports industrial temperature operation (-40C to +85C) under the -40 speed grade suffix used here.
Typical applications include consumer appliance control, IR remote receivers, battery chargers, smoke detectors, and simple sensor interface modules. The 13 I/O pins and two comparators allow direct connection to a PIR sensor, thermistor, or photocell without external glue logic.
When designing with the PIC16C622A, ensure your programmer supports the OTP variant (MPLAB PM3 or equivalent) and that the supply decoupling network uses a 100 nF ceramic capacitor placed within 5 mm of VDD. The two comparator outputs can be routed to an interrupt-on-change pin for low-power wake-up duty cycles.
This page synthesizes distributor pricing, parametric alternatives, and pin-compatible OTP substitutes not consolidated on any single manufacturer page, including a direct side-by-side with the Flash-based PIC16F equivalents that simplify prototyping.
Drop-in alternatives for PIC16C622A-40/SS — 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-40/SS (same form factor and footprint) — differing in Data EEPROM, Operating Temperature Range, Program Memory Size, Program Memory Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-04/SS
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →PIC16C622A-20/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-20E/SS
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC16C622-04/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C622-20/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C622-20E/SS
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C622A-40/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC mid-range (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2048 words x 14-bit) |
| RAM | 128 bytes |
| Data EEPROM | 0 bytes |
| Maximum Clock Frequency | 40 MHz |
| Instruction Cycle Time | 100 ns |
| Number of I/O Pins | 13 |
| Number of Comparators | 2 |
| ADC | None |
| SPI / I2C / UART | 0 / 0 / 0 |
| Timers | TMR0 (8-bit) + TMR1 (16-bit) |
| Operating Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Package | 20-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| Pin Count | 20 |
PIC16C622A-40/SS Pin Configuration
| Pin 1 | RA2/AN2/CVREF — GPIO RA2 / analog input 2 / comparator voltage reference output |
| Pin 2 | RA3/AN3/C1OUT — GPIO RA3 / analog input 3 / comparator 1 output |
| Pin 3 | RA4/T0CKI/C2OUT — GPIO RA4 / TMR0 clock input / comparator 2 output |
| Pin 4 | MCLR — Master Clear reset input (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — GPIO RB0 / external interrupt input |
| Pin 7 | RB1 — GPIO RB1 |
| Pin 8 | RB2 — GPIO RB2 |
| Pin 9 | RB3 — GPIO RB3 |
| Pin 10 | RB4 — GPIO RB4 |
| Pin 11 | RB5 — GPIO RB5 |
| Pin 12 | RB6 — GPIO RB6 |
| Pin 13 | RB7 — GPIO RB7 |
| Pin 14 | VDD — Positive supply (2.5V to 5.5V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RA0/AN0 — GPIO RA0 / analog input 0 |
| Pin 18 | RA1/AN1 — GPIO RA1 / analog input 1 |
| Pin 19 | RA5 — GPIO RA5 |
| Pin 20 | RA6/OSC2 — GPIO RA6 / alternate oscillator output |
Typical Applications
PIC16C622A-40/SS is suitable for 6 applications: PIR Motion Sensor Front-End, IR Remote Control Receiver, Battery Charger Controller, Smoke Detector Signal Processor, Appliance Control Board, Automotive Interior Sensor Module.
PIR Motion Sensor Front-End
The PIC16C622A-40/SS is well suited to PIR motion sensor front-ends because the two on-chip analog comparators can directly amplify the low-frequency output of a dual-element PIR sensor without external op-amps. The 100 ns instruction cycle supports real-time threshold detection and pulse-counting algorithms in firmware, while the 13 I/O pins drive an LED indicator, relay output, and alarm interface. The 40 MHz clock ensures motion events are processed within 200 us, enabling sub-second response to occupancy changes in security and lighting-control products.
Recommended
IR Remote Control Receiver
The PIC16C622A-40/SS fits IR remote control receiver designs because the interrupt-on-change capability on RB0/INT allows the part to wake from sleep on the first carrier pulse from an IR photodiode preamplifier. With 3.5 KB of OTP, firmware can store multiple protocol decoders (NEC, RC5, Sony) and the 40 MHz clock decodes 38 kHz carrier bursts in real time. Power consumption is reduced by sleeping between transmissions, ideal for battery-powered remote handsets and set-top box controllers.
Recommended
Battery Charger Controller
The PIC16C622A-40/SS works as a charger controller for NiMH and lead-acid battery packs because the two comparators can monitor pack voltage and charge current against thresholds set by the internal voltage reference. The 13 I/O pins drive MOSFET gate drivers, status LEDs, and a temperature-sense input via the TMR1 input capture. The OTP memory locks in the charge algorithm, eliminating risk of firmware tampering in production and reducing per-unit cost versus Flash-based alternatives.
Recommended
Smoke Detector Signal Processor
The PIC16C622A-40/SS handles smoke detector signal processing because its two comparators can interface directly with an ionization chamber or photoelectric smoke sensor, providing threshold detection and pulse-pattern analysis. The Watchdog Timer with dedicated RC oscillator ensures the detector recovers from any firmware fault, a regulatory requirement for life-safety products. With 13 I/O pins, the same MCU drives a piezo buzzer, status LED, interconnect line, and low-battery warning, fitting a complete smoke alarm in one SSOP-20 part.
Recommended
Appliance Control Board
The PIC16C622A-40/SS fits washing machine, dishwasher, and microwave oven control boards because its 13 I/O pins handle keypad scanning, seven-segment display driving, relay control, and triac firing. The 100 ns instruction cycle executes state-machine logic for wash cycles or cooking profiles, while OTP memory locks the firmware to prevent field modification. Industrial temperature range (-40C to +85C) supports the thermal environment inside appliance enclosures where ambient can exceed 60C during operation.
Recommended
Automotive Interior Sensor Module
The PIC16C622A-40/SS is applicable to automotive interior sensor modules such as dashboard light sensors, rain sensors, and humidity detectors because the two comparators handle analog signal conditioning and the 13 I/O pins communicate via LIN or simple PWM to the body controller. OTP memory prevents unauthorized firmware modification, important for OEM validation. The part is qualified to Microchip's industrial-grade (-40C to +85C) standard; for under-hood or AEC-Q100 requirements, migrate to PIC16F or PIC18 automotive variants instead.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-40/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-04/SS | PIC16C622A-20/SS | PIC16C622-04/SS | PIC16C622-20/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Maximum Clock Frequency | 40 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Program Memory Type | OTP (3.5 KB) | OTP (3.5 KB) - same | OTP (3.5 KB) - same | OTP (3.5 KB) - same | OTP (3.5 KB) - same |
| RAM | 128 bytes | 128 bytes - same | 128 bytes - same | 128 bytes - same | 128 bytes - same |
| Number of I/O Pins | 13 | 13 - same | 13 - same | 13 - same | 13 - same |
| Comparators | 2 | 2 - same | 2 - same | 2 - same | 2 - same |
| Operating Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same |
| Silicon Revision | A | A - same | A - same | Non-A | Non-A |
| Pin Compatibility | Reference | Drop-in (slower clock) | Drop-in (slower clock) | Drop-in (older silicon) | Drop-in (older silicon) |
Key Differentiators
- Highest speed grade in the PIC16C622A family (vs PIC16C622A-20/SS)
- Two integrated analog comparators reduce external component count (vs PIC16F690-I/SS)
- OTP memory prevents firmware reverse-engineering in production (vs PIC16F622-I/SS)
Design Notes
Estimated: at VDD=5V and active clock at 40 MHz, the PIC16C622A typically draws 8-15 mA depending on I/O loading and peripheral activity. Place a 100 nF ceramic decoupling capacitor within 5 mm of VDD (pin 14) and a 10 uF bulk capacitor near the regulator output. For sleep-mode designs, supply current drops below 1 uA, making battery operation feasible if the firmware parks the CPU between sensor events.
For designs that target the 40 MHz rating of the PIC16C622A-40/SS, use a fundamental-mode crystal or ceramic resonator with load capacitors sized per the manufacturer's CL specification. A typical 10 MHz crystal with 15 pF caps gives reliable start-up; for EMI-sensitive applications, route the oscillator traces short and symmetric, guarded by a ground ring. If clock accuracy is not critical, the internal RC oscillator option frees two pins but limits frequency to 4 MHz.
Common design pitfalls with the PIC16C622A-40/SS include forgetting the MCLR pull-up resistor (10 kOhm to VDD is standard), leaving ICSP pins RB6/RB7 without isolation from application circuitry (which can prevent in-circuit programming), and exceeding the OTP write endurance by attempting to reprogram - the memory is one-time only. Always program a known-good firmware image using MPLAB PM3 before sealing the production board.
SSOP-20 has a 0.65 mm pin pitch, requiring careful PCB land pattern design with non-solder-mask-defined pads to prevent tombstoning during reflow. Stencil aperture should be approximately 80% of the pad area to control solder paste deposition. Hand-soldering the SSOP-20 is feasible with a fine tip and flux but production volumes should use reflow or selective soldering for reliability.
Compliance Information
RoHS status, lead-free, and halogen-free information not explicitly provided in the verified web data. The part uses OTP memory and is intended for industrial-grade applications (-40C to +85C). For automotive AEC-Q100 requirements, migrate to PIC16F or PIC18 automotive-qualified equivalents.