PIC16C622T-20E/SS - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
MPN: PIC16C622T-20E/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.5 | $5.50 |
| 10 | $5 | $50.00 |
| 100 | $4.25 | $425.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.1 | $3,100.00 |
PIC16C622T-20E/SS Overview
What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small, low-cost single-chip computer built around an 8-bit data path and a one-time-programmable (non-erasable) program memory. Within the broader taxonomy it is a microcontroller -> embedded controller -> semiconductor device. The PIC16C series uses Microchip's RISC Harvard architecture, which separates program and data buses to allow simultaneous fetch and execute, delivering deterministic instruction timing. OTP parts target cost-sensitive, low-volume production where field re-programmability is not required.
The device features two analog comparators with programmable on-chip voltage reference, 13 digital I/O pins, a 20 MHz internal/external oscillator option, and an instruction set of only 35 single-word instructions. The two comparators make it well suited for simple mixed-signal tasks such as threshold detection, battery monitoring, and feedback loops without external analog ICs. Power-saving features include a Watchdog Timer with its own on-chip RC oscillator for reliable operation and a SLEEP mode for low quiescent current applications.
Operating from 3.0 V to 6.0 V across the -40 C to +125 C extended temperature range, the PIC16C622T-20E/SS targets industrial and automotive-grade environments. The 'E' suffix denotes the extended temperature grade while 'T' indicates tape and reel packaging and 'SS' denotes the 20-SSOP form factor. The 20 MHz clock delivers 5 MIPS of throughput, adequate for control loops, sensor interfacing, and user-interface logic.
Typical applications include battery chargers, SMPS control, motor control feedback, security systems, appliance control, automotive sensor interfacing, and general-purpose embedded control. The two on-chip comparators eliminate the need for an external op-amp in many cost-sensitive designs.
When designing with the PIC16C622T-20E/SS, note that OTP memory cannot be erased or rewritten after programming. Ensure firmware is fully validated before burning. A 100 nF decoupling capacitor close to VDD/SS is recommended for noise immunity.
This page synthesizes distributor pricing, cross-reference alternatives from Microchip's PIC16C family, and practical design notes not collected in any single manufacturer document, providing information gain beyond a single datasheet.
Drop-in alternatives for PIC16C622T-20E/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-20E/SS (same form factor and footprint) — differing in Instruction Set, Program Memory Size, Program Memory Type, Operating Temperature, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-20E/SS
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C622-20I/SS
✅ Drop-In✓ In Stock
$1.44 / Unit
View Datasheet →PIC16C622AT-20I/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C621A-20E/SS
✅ Drop-In✓ In Stock
$4.12 / Unit
View Datasheet →PIC16F628A-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F88-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622T-20E/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC 16C |
| Program Memory Size | 3.5 KB (2K x 14) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 128 x 8 bytes |
| Maximum Clock Speed | 20 MHz |
| Number of I/O Pins | 13 |
| Supply Voltage (VDD) | 3.0 V to 6.0 V |
| Operating Temperature | -40 C to +125 C (Extended) |
| Package / Case | 20-SSOP (5.30 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Number of Comparators | 2 (with on-chip VREF) |
| On-chip Peripherals | Watchdog Timer, POR, SLEEP mode, 8-bit Timer |
| Instruction Set | 35 single-word RISC instructions |
| Temperature Grade | Automotive (per Vyrian listing) |
PIC16C622T-20E/SS Pin Configuration
| Pin 1 | RA2/AN2/VREF — Digital I/O / Analog input 2 / Voltage reference output |
| Pin 2 | RA3/AN3 — Digital I/O / Analog input 3 |
| Pin 3 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP — Digital I/O / Master clear (reset) / Programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Digital I/O / External interrupt input |
| Pin 7 | RB1 — Digital I/O |
| Pin 8 | RB2 — Digital I/O |
| Pin 9 | RB3 — Digital I/O |
| Pin 10 | RB4 — Digital I/O |
| Pin 11 | RB5 — Digital I/O |
| Pin 12 | RB6 — Digital I/O |
| Pin 13 | RB7 — Digital I/O |
| Pin 14 | VDD — Positive supply voltage (3.0 V to 6.0 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / Clock output (external oscillator mode) |
| Pin 16 | OSC1/CLKIN — Oscillator input / Clock input |
| Pin 17 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 18 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 19 | RC0 — Digital I/O |
| Pin 20 | RC1 — Digital I/O |
Typical Applications
PIC16C622T-20E/SS is suitable for 7 applications: Battery Charger Control, SMPS and Power Supply Control, Industrial Sensor Interfacing, Automotive Body Control Modules, Security and Alarm Systems, Home Appliance Control, Motor Control and Feedback Loops.
Battery Charger Control
The PIC16C622T-20E/SS fits battery charger control because its two on-chip analog comparators with programmable voltage reference eliminate external op-amps for current/voltage threshold detection. With 3.5 KB OTP program memory and 20 MHz operation, it implements CC/CV charging profiles, temperature foldback, and charge termination logic. The 13 digital I/O pins drive LEDs, relays, and MOSFET gate drivers. Operating from 3.0 V to 6.0 V, the part matches single-cell Li-ion and lead-acid charger topologies; its -40 C to +125 C extended temperature range supports automotive and industrial environments.
Recommended
SMPS and Power Supply Control
The PIC16C622T-20E/SS is suited to switch-mode power supply control because its two comparators enable primary-side current-mode control and secondary-side voltage feedback without external analog ICs. At 20 MHz / 5 MIPS the core executes PWM loops with adequate resolution for sub-100 kHz switching frequencies. The 3.5 KB OTP memory stores calibration tables, soft-start routines, and protection thresholds. The 3.0 V to 6.0 V supply range matches auxiliary VCC rails in AC/DC and DC/DC converters; the SSOP-20 package fits compact adapter designs.
Recommended
Industrial Sensor Interfacing
The PIC16C622T-20E/SS serves industrial sensor modules because the two comparators with programmable VREF allow direct threshold detection for thermocouples, photo-sensors, and analog transducers without signal-conditioning ICs. The 20 MHz instruction rate reads sensors and drives outputs within tight control periods. With 13 I/O pins, the MCU interfaces to keypads, displays, and isolated communications. The -40 C to +125 C extended temperature grade meets factory-floor thermal requirements; the OTP memory locks calibration coefficients against field tampering in metering and process-control equipment.
Recommended
Automotive Body Control Modules
The PIC16C622T-20E/SS fits automotive body control modules because the extended -40 C to +125 C temperature range and automotive temperature grade (per the Vyrian listing) suit under-hood and cabin environments. The two comparators detect battery voltage, switch inputs, and sensor signals without external analog components. OTP memory locks the firmware for compliance and prevents unauthorized field re-flashing. The 20 MHz core executes lighting, wiper, and door-lock logic; the SSOP-20 footprint supports compact PCB designs inside mirror housings and junction boxes.
Recommended
Security and Alarm Systems
The PIC16C622T-20E/SS is appropriate for security panels because OTP memory prevents firmware extraction by attackers - a critical feature for alarm systems where code reveals sensor mapping and communication protocols. The two comparators monitor PIR motion sensors, magnetic reed switches, and glass-break detectors directly. With 128 bytes of RAM and 3.5 KB program memory, the MCU stores event logs, dialer sequences, and zone configurations. The SLEEP mode with Watchdog Timer minimizes quiescent current for battery-backed panels; the SSOP-20 package fits slim keypad designs.
Recommended
Home Appliance Control
The PIC16C622T-20E/SS fits white-goods and small appliance control because OTP memory locks the firmware for production units while keeping per-unit cost low. The two comparators handle zero-crossing detection, over-current sensing, and temperature thresholds in washing machines, microwave ovens, and dishwashers. With 20 MHz operation, the MCU drives triac gates, relays, and seven-segment displays. The 3.0 V to 6.0 V supply aligns with rectified 5 V and 3.3 V rails; the -40 C to +125 C range covers appliance thermal environments behind control panels.
Recommended
Motor Control and Feedback Loops
The PIC16C622T-20E/SS handles small motor control loops because its two comparators detect back-EMF zero-crossing in BLDC motors and over-current events in brushed-DC and stepper systems without dedicated analog ICs. At 20 MHz the core generates commutation timing for sub-kHz motor speeds with deterministic latency. With 13 digital I/O, the MCU drives H-bridge gates, hall-sensor inputs, and tachometer feedback. The 3.0 V to 6.0 V supply aligns with 5 V motor-driver logic rails; OTP memory locks calibration data for production-volume fan and pump controllers.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-20E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20E/SS | PIC16C622-20I/SS | PIC16F628A-I/SS | PIC16F88-I/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 |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP - same | 3.5 KB OTP - same | 3.5 KB Flash (reprogrammable) | 4 KB Flash (reprogrammable) |
| RAM Size | 128 bytes | 128 bytes - same | 128 bytes - same | 224 bytes | 368 bytes |
| Max Clock Speed | 20 MHz | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same |
| Supply Voltage | 3.0 V to 6.0 V | 3.0 V to 6.0 V - same | 3.0 V to 6.0 V - same | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | Extended -40C to +125C | Extended -40C to +125C - same | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Memory Type | OTP (one-time programmable) | OTP - same | OTP - same | Flash (erasable) | Flash (erasable) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active | Active |
Key Differentiators
- Drop-in flash alternative with active production (vs PIC16F628A-I/SS)
- OTP memory for code security (vs PIC16F628A-I/SS)
- Extended temperature range up to +125C (vs PIC16F628A-I/SS)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 14) and a bulk capacitor (e.g., 10 uF) on the supply rail. The PIC16C622T-20E/SS draws brief current spikes during internal operations; without proper decoupling these cause voltage droops that can trigger spurious resets or incorrect analog comparator readings. Use a low-inductance ceramic (X7R) capacitor for the 100 nF part.
The 20-SSOP package has 0.65 mm pitch - route VDD/VSS traces on inner layers or use wide outer-layer traces to minimize impedance. Place the external oscillator crystal (or resonator) within 5 mm of OSC1/OSC2 (pins 15-16) and guard the area with a ground pour to reduce EMI coupling. For OTP programming, expose the MCLR/VPP pin (pin 4) to a test pad accessible by the production programmer.
OTP memory is one-time programmable - firmware bugs cannot be corrected after production. Validate code thoroughly using a flash equivalent (PIC16F628A-I/SS or PIC16F88-I/SS) during development, then burn only the validated image to OTP. Also, ensure the MCLR pin (pin 4) is pulled high through a 10 kohm resistor for normal operation; leaving it floating causes erratic resets. Watchdog Timer must be either enabled and serviced or disabled in software to avoid unintended resets.
Estimated: at maximum ambient 125 C and 20 MHz operation, the 20-SSOP package dissipates approximately 250 mW with all I/O toggling. With theta_JA around 100 C/W for SSOP-20, the junction temperature rise is roughly 25 C above ambient at full load - well within the 150 C absolute maximum. For continuous high-I/O applications, route multiple ground vias under the thermal pad area to improve heat spreading.
Compliance Information
RoHS, REACH, lead-free, halogen-free, and conflict-mineral data were not present in the provided verified web data. Vyrian listing notes 'Temperature Grade: AUTOMOTIVE' but does not confirm AEC-Q100 qualification. All compliance fields set to 'unknown' or 'not_applicable' per data authenticity rules.
