PIC16C622T-20I/SS - 8-bit OTP MCU, 20MHz, 3.5KB | Microchip
MPN: PIC16C622T-20I/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.95 | $29.50 |
| 100 | $2.5 | $250.00 |
| 500 | $2.15 | $1,075.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC16C622T-20I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and configurable peripheral I/O on one IC. The PIC16C family uses a RISC architecture with 35 single-cycle instructions, which delivers deterministic throughput at low power. Within the broader category hierarchy, the PIC16C622 belongs to: microcontroller -> embedded controller -> semiconductor IC. The OTP variant is intended for low-cost production where firmware is finalized and field re-programmability is not required.
Key features include a 20 MHz maximum clock speed, 14-bit instruction word, 8-bit data path, 13 bidirectional I/O pins, a hardware 8-bit timer/counter (TMR0), a Watchdog Timer with independent on-chip oscillator, power-on reset, brown-out detection, and programmable code protection. The device operates from 2.5 V to 5.5 V and draws a typical 2 mA at 5 V / 20 MHz, with < 1 µA standby current for battery-friendly designs.
The PIC16C622T-20I/SS employs a Harvard architecture with separate program and data buses, allowing instruction fetch and operand read to occur in a single clock cycle. Its CMOS OTP cell array and CMOS EPROM technology provide robust operation, and the on-chip RC oscillator option reduces external component count. An analog comparator module is integrated, eliminating the need for an external op-amp in many signal-conditioning interfaces.
Typical applications include consumer appliance control, sensor signal conditioning with on-chip comparator, low-end remote control transmitters, white goods user interfaces, and industrial control modules where small form factor and cost dominate over flash reprogrammability. The 20-pin SSOP footprint suits compact PCBs and pick-and-place assembly lines.
When designing with this part, plan OTP programming into the production flow (programmer required per unit) and reserve brown-out reset configuration in the configuration word. For new designs, Microchip generally recommends migrating to the flash-based PIC16F family for development flexibility, while reserving the OTP C-variant for cost-optimized mature products.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16C622T-20I/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 PIC16C622T-20I/SS (same form factor and footprint) — differing in Timers, Program Memory Size, Program Memory Type, RoHS Status, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622AT-20I/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C622-20I/SS
✅ Drop-In✓ In Stock
$1.44 / Unit
View Datasheet →PIC16C621AT-20I/SS
✅ Drop-In✓ In Stock
$0.81 / Unit
View Datasheet →PIC16C620AT-20I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C58B-20I/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16C622T-20I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM | 128 bytes |
| EEPROM | 0 bytes |
| Maximum Clock Frequency | 20 MHz |
| Instruction Set Width | 14-bit |
| I/O Pins | 13 |
| Data Bus Width | 8-bit |
| Operating Voltage Range | 2.5 V to 5.5 V (typical 5 V) |
| Operating Temperature Range | -40°C to +85°C (Industrial) |
| Package | 20-SSOP (5.30 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| Timers | TMR0 (8-bit) |
| Comparators | 1 on-chip analog comparator |
| Watchdog Timer | Yes (independent on-chip oscillator) |
| Brown-out Reset | Yes |
| RoHS Status | Compliant |
PIC16C622T-20I/SS Pin Configuration
| Pin 1 | RA2/AN2/CVREF — Bidirectional I/O / analog input / comparator reference |
| Pin 2 | RA3/AN3 — Bidirectional I/O / analog input |
| Pin 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP — I/O / Master Clear (reset) / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O / external interrupt |
| Pin 7 | RB1 — Bidirectional I/O |
| Pin 8 | RB2 — Bidirectional I/O |
| Pin 9 | RB3 — Bidirectional I/O |
| Pin 10 | RB4 — Bidirectional I/O |
| Pin 11 | RB5 — Bidirectional I/O |
| Pin 12 | RB6 — Bidirectional I/O |
| Pin 13 | RB7 — Bidirectional I/O |
| Pin 14 | VDD — Positive supply (2.5V to 5.5V) |
| Pin 15 | OSC2/CLKOUT — Crystal output / clock output |
| Pin 16 | OSC1/CLKIN — Crystal input / external clock input |
| Pin 17 | RA0/AN0 — Bidirectional I/O / analog input / comparator input |
| Pin 18 | RA1/AN1 — Bidirectional I/O / analog input / comparator input |
| Pin 19 | RC0 — Bidirectional I/O (or comparator output) |
| Pin 20 | RC1 — Bidirectional I/O |
Typical Applications
PIC16C622T-20I/SS is suitable for 6 applications: Consumer Appliance Control, Sensor Signal Conditioning with On-chip Comparator, Remote Control Transmitter (RF/IR), White Goods User Interface Module, Industrial Control Modules, Battery-Operated Sensor Nodes.
Consumer Appliance Control
The PIC16C622T-20I/SS suits low-cost consumer appliances such as coffee makers, microwaves, and washing machines where the 3.5 KB OTP program memory fits the application and final firmware is locked. Its 13 I/O pins drive relays, LEDs, and button matrices, while the integrated analog comparator interfaces directly with thermistor or water-level sensors without an external op-amp. At 2 mA active / 5 V / 20 MHz the device meets energy-star idle budgets when paired with its <1 µA standby mode. The 20-pin SSOP keeps the PCB compact and pick-and-place friendly, while the -40°C to +85°C industrial grade handles under-cabinet heat and cold-start conditions. For these reasons, mature kitchen and laundry appliances remain the highest-volume target for the PIC16C622 OTP family.
Recommended
Sensor Signal Conditioning with On-chip Comparator
The PIC16C622T-20I/SS integrates an analog comparator that pairs directly with low-impedance sensors such as NTC probes, photodiodes, and current-shunt monitors. Connecting the sensor to the comparator inputs and reading the result via an internal register removes an external active component and reduces BOM cost. The 20 MHz instruction rate lets the MCU debounce and linearize the comparator output in software within tight control loops. The 5 V typical supply aligns with industrial 24 V bus systems stepped down through a small linear regulator, and the SSOP-20 footprint fits the compact analog front-end modules often used in process instrumentation.
Recommended
Remote Control Transmitter (RF/IR)
The PIC16C622T-20I/SS's 13 I/O pins and 20 MHz throughput generate 38 kHz IR carrier modulation and matrix-scan up to 16 buttons using a 4x4 diode matrix. Its low standby current (<1 µA) extends battery life in remote controls that sit idle for months. The 3.5 KB OTP holds the IR protocol tables for TV, STB, and HVAC devices, and the brown-out reset ensures clean startup on weak batteries. The 20-SSOP package fits inside slim-line remote enclosures and supports automatic pick-and-place assembly for high-volume production.
Recommended
White Goods User Interface Module
White goods such as dishwashers and refrigerators use the PIC16C622T-20I/SS to drive seven-segment or 14-segment displays, scan capacitive or resistive keypads, and communicate with the main controller via UART or simple bit-banged protocols. The 13 I/O pins directly interface with display drivers and key matrix wiring without external glue logic, while the 14-bit instruction word makes timer-driven multiplexing straightforward. The industrial -40°C to +85°C temperature range tolerates the under-counter or inside-door thermal environment. OTP memory locks the firmware against field tampering, which is a regulatory plus ergonomic benefit for appliance OEMs.
Recommended
Industrial Control Modules
The PIC16C622T-20I/SS fits small industrial modules such as relay drivers, contactor controllers, and simple I/O expansion blocks that sit on a 24 V DIN-rail backplane. Its 5.5 V absolute-maximum VDD tolerates loosely regulated industrial supplies when paired with a TVS diode, and the brown-out reset avoids spurious actuation during supply dips. The 13 I/O drive status LEDs, optocoupler inputs, and small-signal relays. The OTP memory prevents firmware drift in deployed units, which is critical for safety and regulatory audit trails in industrial control cabinets.
Recommended
Battery-Operated Sensor Nodes
Battery-powered sensor nodes such as window sensors, occupancy detectors, and wireless pushbuttons benefit from the PIC16C622T-20I/SS's <1 µA standby current and integrated analog comparator for threshold detection. The MCU wakes on comparator or pin change, transmits a packet via an external radio, and returns to standby - achieving multi-year battery life on a single CR2032 cell. The 20-SSOP package keeps the module under 100 mm², and the 3.5 KB OTP stores the RF protocol state machine. Industrial temperature grade tolerates outdoor enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-20I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622AT-20I/SS | PIC16C622-20I/SS | PIC16C621AT-20I/SS | PIC16C620AT-20I/SS | PIC16C58B-20I/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB OTP | 512 B OTP | 2 KB OTP |
| RAM | 128 B | 128 B | 128 B | 128 B | 96 B | 73 B |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 12 |
| On-chip Comparator | Yes | Yes | Yes | Yes | No | No |
| Operating Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
Key Differentiators
- Largest OTP memory in PIC16C6x 20-SSOP family (vs PIC16C621AT-20I/SS)
- Integrated analog comparator (vs PIC16C620AT-20I/SS)
- PIC16C6xx family register compatibility (vs PIC16C58B-20I/SS)
Design Notes
The PIC16C622T-20I/SS is OTP (One-Time Programmable). Once a unit is programmed it cannot be erased or reflashed, so any firmware bug becomes a scrapped PCB. Plan a thorough validation flow on PIC16F equivalent parts before committing OTP production. Always order prototypes as the flash-based PIC16F690T-I/SS to avoid wasting OTP units during development.
Estimated: at 20 MHz / 5 V the device draws approximately 2 mA active current and below 1 µA in standby per the Microchip PIC16C62X datasheet (DS30223G). For battery-powered designs, ensure firmware uses the SLEEP instruction aggressively and wakes only on interrupt (RB0/INT or comparator) to maximize battery life. Decouple VDD with a 100 nF ceramic placed within 5 mm of pin 14, plus a 10 µF bulk capacitor for transient loads.
Route the OSC1/OSC2 traces as short as possible and keep them away from high-current switching traces to avoid coupling noise into the clock. Place the decoupling capacitor and the crystal load capacitors within 5 mm of the MCU pins. The MCLR/VPP pin (pin 4) needs a 10 kΩ pull-up to VDD; do not leave it floating. For in-circuit programming, expose an ICSP connector with VPP, VDD, VSS, RB6, and RB7 brought out.
Compliance Information
RoHS compliant and lead-free per Microchip product page; not AEC-Q100 qualified (use PIC16F automotive variant for automotive applications). Lifecycle status is NRND per Microchip.
