PIC16C622T-04I/SO - 8-bit MCU, 3.5KB OTP, 13 I/O | Microchip
MPN: PIC16C622T-04I/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.21 | $5.21 |
| 10 | $4.78 | $47.80 |
| 100 | $4.12 | $412.00 |
| 500 | $3.45 | $1,725.00 |
| 1,000 | $2.86 | $2,860.00 |
| 3,000 | $2.06 | $6,180.00 |
PIC16C622T-04I/SO Overview
An 8-bit microcontroller (MCU) is a single integrated device that combines a CPU core, program memory, data RAM, peripherals and I/O on one silicon die. Within the embedded-system hierarchy, an MCU sits between a fixed-logic ASIC (full custom silicon) and a microprocessor (which requires external memory and peripherals). The PIC16C family uses a RISC Harvard architecture with a 14-bit instruction word, separate program and data buses, and a deterministic instruction cycle that simplifies real-time control. The OTP variant is intended for volume production where firmware is finalized; for prototyping and field updates, the FLASH-based PIC16F family is generally preferred.
Key features include a hardware 8-bit timer/counter with a prescaler, an analog comparator module with programmable reference, watchdog timer with on-chip RC oscillator for reliable resets, power-saving SLEEP mode, in-circuit serial programming (ICSP) interface, and 25 mA source/sink capability per pin to drive LEDs and small relays directly. The architecture delivers 5 MIPS at 4 MHz and provides 35 single-word instructions.
The device's analog comparator makes it suitable for battery-voltage monitoring and threshold-based control loops without an external op-amp. Power-on reset, brown-out detection and the wide operating voltage window reduce external component count in cost-sensitive designs.
Typical applications include appliance control, security-system keypads, IR remote controls, sensor signal conditioning, automotive body electronics (non-safety), and battery chargers. The industrial temperature window also supports factory-floor sensor interfaces.
When designing with this part, note that PIC16C OTP devices are windowless and cannot be reprogrammed. Use a PIC16F equivalent for development and migrate firmware to the 'C' OTP device for production to avoid wasted engineering samples.
This page synthesizes distributor pricing, parametric drop-in alternatives and practical design considerations not collected in any single manufacturer datasheet, helping engineers evaluate the PIC16C622T-04I/SO against modern FLASH-based PIC16F and PIC16F1xxx alternatives.
Drop-in alternatives for PIC16C622T-04I/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-04I/SO (same form factor and footprint) — differing in Program Memory Type, Program Memory Size, RoHS Status, Core Architecture, Package / Case.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-04I/SO
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC16C622T-04I/SO
✅ Drop-In✓ In Stock
$2.06 / Unit
View Datasheet →PIC16C622-04/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-04I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.72 / Unit
View Datasheet →PIC16C621T-04I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.85 / Unit
View Datasheet →PIC16F716-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622T-04I/SO Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC16C |
| Core | 8-bit PIC RISC |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 x 8 bytes |
| EEPROM Size | None |
| Maximum CPU Frequency | 4 MHz |
| Instruction Set Width | 14-bit |
| I/O Pins | 13 |
| Operating Voltage | 3.0 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial, "I") |
| Package / Case | 18-SOIC (0.295", 7.50 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
| A/D Converter | None (analog comparator only) |
| Timers | 1 x 8-bit Timer0 with prescaler |
| Peripherals | Brown-out Detect, Watchdog Timer, Analog Comparator |
| Connectivity | ICSP (In-Circuit Serial Programming) |
| RoHS Status | Non-compliant (OTP windowless C-grade part) |
PIC16C622T-04I/SO Pin Configuration
| Pin 1 | RA2/AN2 — Bidirectional I/O; analog channel 2 |
| Pin 2 | RA3/AN3 — Bidirectional I/O; analog channel 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O; Timer0 clock input |
| Pin 4 | RA5/SS — Bidirectional I/O; slave select |
| 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; ICSP clock |
| Pin 13 | RB7 — Bidirectional I/O; ICSP data |
| Pin 14 | VDD — Positive supply (3.0-5.5 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output; clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input; clock in |
| Pin 17 | RA0/AN0 — Bidirectional I/O; analog channel 0 |
| Pin 18 | RA1/AN1 — Bidirectional I/O; analog channel 1 |
Typical Applications
PIC16C622T-04I/SO is suitable for 6 applications: Appliance Control Boards, Security System Keypads, IR Remote Control Handsets, Battery Charger Controllers, Sensor Signal Conditioning, Automotive Body Electronics (Non-Safety).
Appliance Control Boards
The PIC16C622T-04I/SO is widely deployed in cost-sensitive white-goods appliance control such as washing-machine user interfaces, microwave keypads and dishwasher timer boards. Its 4 MHz core delivers 5 MIPS, sufficient to scan 4x4 button matrices every 25 ms while servicing triac-fire interrupts for heater and motor control. The 13 I/O pins provide enough channels to drive 7-segment LED displays directly using the 25 mA source/sink capability per pin, eliminating external transistor arrays. Brown-out reset and watchdog timer survive noisy AC-line environments where bulk-capacitor sag can drop VDD momentarily during relay switching. Industrial -40 to +85 °C temperature rating covers under-counter and garage-appliance installations. OTP memory locks firmware against field tampering and reverse engineering, a regulatory requirement in some appliance safety standards.
Recommended
Security System Keypads
Self-contained security-system keypads and remote-entry controllers benefit from the PIC16C622T-04I/SO's low 3.0-5.5 V VDD range, allowing direct connection to 3.3 V lithium-battery backup rails without level shifters. The 128-byte RAM is adequate for storing 6-digit PIN buffers, alarm state flags and 4 ms debounce timers without external memory. The analog comparator module monitors battery voltage against an internal bandgap reference, generating a low-battery alert when VDD falls below ~2.7 V - this avoids the cost of a dedicated supervisor IC. SLEEP mode current drops to microampere levels, extending coin-cell life in wireless PIR sensor transmitters. The OTP memory ensures installed firmware cannot be flashed to bypass the alarm logic, satisfying insurance and police-response certification bodies.
Recommended
IR Remote Control Handsets
IR remote-control handsets for TVs, set-top boxes and audio gear use the PIC16C622T-04I/SO in a small 18-SOIC package that fits a thin AA-battery enclosure. SLEEP mode current in the low-microampere range enables standby battery life measured in years rather than months. The 8-bit Timer0 with prescaler generates the 38 kHz carrier for RC5, NEC and SIRC IR protocols without software overhead. Brown-out reset prevents the handset from locking up when batteries drop below 2.0 V at end of life. The 3.5 KB OTP holds 80-120 button codes plus protocol encoding tables. Industrial temperature rating tolerates glove-warm storage in cars and unheated rooms during winter shipment.
Recommended
Battery Charger Controllers
Compact NiMH and lead-acid battery chargers for cordless tools, emergency lighting and e-bike systems use the PIC16C622T-04I/SO for closed-loop charge control. The analog comparator combined with internal bandgap reference measures battery voltage through a resistive divider and terminates charge when full-pack voltage is reached, implementing -delta-V detection without external op-amps. The 8-bit Timer0 drives PWM duty at 1 kHz to a MOSFET gate driver via a single GPIO pin, controlling charge current with 8-bit resolution. Industrial -40 to +85 °C range covers automotive-cabin and outdoor solar-charger enclosures. OTP memory locks the charge algorithm against field modification, an important safety feature for consumer lithium-chemistry chargers where firmware errors can cause fire.
Recommended
Sensor Signal Conditioning
Industrial sensor-transmitter nodes for temperature, humidity and 4-20 mA loop-powered field instruments use the PIC16C622T-04I/SO to digitize analog signals and encode them onto a 2-wire current loop or wireless link. The analog comparator triggers a software-SAR ADC routine that resolves sensor voltage to 8 bits in ~1 ms, sufficient for thermocouple cold-junction compensation and RTD bridge linearization. The watchdog timer prevents the sensor node from locking up when EMC events on the loop cable inject noise into the supply rail. Brown-out reset keeps the node in a defined state through cold-start, hot-swap and inductive-load events on the loop. Industrial temperature rating matches outdoor process-control cabinet environments, and OTP memory locks the calibration coefficients against tampering.
Recommended
Automotive Body Electronics (Non-Safety)
Non-safety automotive body modules - interior lighting controllers, seat-position memories, mirror-adjustment switches and HVAC blend-door actuators - deploy the PIC16C622T-04I/SO for distributed I/O concentration. The industrial -40 to +85 °C temperature grade matches cabin electronics requirements (full AEC-Q100 Grade 3 would require a -Q1 suffix part, not present here, so use only for non-safety interior modules). The 13 I/O pins scan 6-window and 6-mirror position switches while driving 4 actuator relays through discrete FETs. The watchdog timer catches the brown-out and load-dump transients common in 12 V automotive electrical systems. OTP memory locks the actuator travel limits, preventing field tampering that could damage door glass or seat mechanisms.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-04I/SO | PIC16C622-04/SO | PIC16C622A-04I/SO | PIC16C621T-04I/SO | PIC16F716-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.295") | 18-SOIC (0.295") | 18-SOIC (0.295") | 18-SOIC (0.295") | 18-SOIC (0.295") | 18-SOIC (0.295") |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB OTP | 2 KB FLASH |
| Max CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | FLASH |
| Temperature Grade | -40 to +85 °C (Industrial) | -40 to +85 °C (Industrial) | 0 to +70 °C (Commercial) | -40 to +85 °C (Industrial) | -40 to +85 °C (Industrial) | -40 to +85 °C (Industrial) |
| ADC | None (analog comparator only) | None | None | None | None | 10-bit 8-channel |
| Lifecycle | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Obsolete PIC16C OTP silicon with finite inventory (vs PIC16F716-I/SO)
- Maximum program memory in the PIC16C62X 18-pin SOIC family (vs PIC16C621T-04I/SO)
- Industrial temperature grade with same die as commercial variant (vs PIC16C622-04/SO)
Design Notes
The PIC16C622T-04I/SO operates from 3.0 V to 5.5 V; configure the BOR (Brown-Out Reset) configuration fuse to a threshold below the minimum regulated VDD (typically 3.0 V for 3.3 V systems or 4.0 V for 5 V systems) to force a clean reset during VDD sag. Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 14) and a 10 µF bulk capacitor within 1 cm to suppress switching noise from relay and triac loads sharing the same rail.
OTP EPROM parts cannot be erased once programmed. Engineering samples wasted by firmware errors cost the full unit price. Always develop firmware on a PIC16F62X FLASH-equivalent (e.g. PIC16F716-I/SO) using identical 18-SOIC footprint, then port the validated hex file to PIC16C622T-04I/SO for production. Verify the configuration bits (_CP_OFF, _WDTE_ON, _BOREN_ON, _PWRTE_ON, _LVP_OFF) match between development and production parts because FLASH and OTP configuration word layouts differ in the upper bits.
The ICSP pins (RB6/RB7) share general-purpose I/O functions and must not be loaded above 25 mA during in-circuit programming. Add 10 kΩ series resistors on RB6/RB7 if those pins also drive LEDs or relay coils in the application circuit, so the programmer can over-drive them to 13 V VPP without fighting the load. ICSP connector placement on the PCB should keep the 6-pin header within 5 cm of the MCU to avoid EMI-induced programming failures.
Compliance Information
PIC16C OTP windowless parts are pre-RoHS silicon and ship in leaded 18-SOIC packages. The 'I' suffix indicates industrial temperature grade -40 to +85 °C; this is NOT the AEC-Q100 automotive qualification. For AEC-Q100 automotive body electronics, request a -Q1 suffix variant. REACH, halogen-free and conflict-mineral status are not stated in the manufacturer datasheet and should be confirmed with the franchised distributor before EU export.