PIC16C622T-04/SO - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C622T-04/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.6 | $26.00 |
| 100 | $2.32 | $232.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.88 | $1,880.00 |
PIC16C622T-04/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and peripheral interfaces on one die. Within the broader semiconductor taxonomy, the PIC16C622 belongs to the 8-bit microcontroller hierarchy, then to the RISC microcontroller sub-family, then to the OTP/EPROM-based microcontrollers category, and finally to Microchip's mid-range PIC16C series. OTP devices are programmed once and are widely used in cost-sensitive, low-to-medium volume embedded applications where re-programmability is not required.
Key features of the PIC16C622T-04/SO include its 4 MHz maximum clock speed, 13 general-purpose I/O lines, an internal 4 MHz RC oscillator option, and compatibility with the PIC16CXXX instruction set. The 18-SOIC package provides a 1.27 mm terminal pitch and supports surface-mount assembly. The "T" suffix indicates tape-and-reel packaging, and the "/SO" suffix denotes the SOIC form factor. The device operates from a 3.0 V to 6.0 V supply and includes a commercial temperature grade (0 °C to +70 °C).
Architecturally, the PIC16C622 implements a Harvard RISC core with separate program and data buses, 14-bit wide instruction words, and a 35-instruction set that simplifies firmware development. Its CMOS design yields low power consumption suitable for battery-operated and always-on systems. The OTP program memory allows the device to be programmed by Microchip's MPLAB PM3 Universal Device Programmer.
Typical applications include consumer appliances, simple motor and lighting controllers, low-cost sensor interface boards, and replacement of discrete logic in legacy embedded designs. Its 13 I/O lines are sufficient for keypad scanning, LED driving, and small signal-conditioning tasks.
When designing with the PIC16C622T-04/SO, note that OTP memory cannot be erased, so firmware must be fully validated before programming. For prototyping or field-upgradable designs, consider the flash-based PIC16F series equivalents in the same 18-pin SOIC footprint. Provide a 0.1 µF decoupling capacitor close to VDD and follow Microchip's recommended oscillator layout for the selected clock source.
This page synthesizes verified distributor pricing, drop-in same-family alternatives, and practical design considerations not consolidated on a single manufacturer page, helping engineers evaluate, source, and replace the PIC16C622T-04/SO with confidence.
Drop-in alternatives for PIC16C622T-04/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-04/SO (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Package, RoHS Status, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622T-04I/SO
✅ Drop-In✓ In Stock
$2.06 / Unit
View Datasheet →PIC16C622-04/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622T-04E/SO
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →PIC16C621T-04/SO
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC16C620T-04/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC16C622A-04I/SO
✅ Drop-In✓ In Stock
$2.72 / Unit
View Datasheet →PIC16C622T-04/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Family | PIC16C mid-range |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM | 128 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Set Width | 14-bit |
| Instruction Count | 35 instructions |
| I/O Pins | 13 |
| Supply Voltage (VDD) | 3.0 V to 6.0 V |
| Temperature Grade | Commercial (0 °C to +70 °C) |
| Package | 18-SOIC (R-PDSO-G18) |
| Terminal Pitch | 1.27 mm |
| Terminal Form | Gull Wing |
| Mounting Type | Surface Mount |
| Programming Method | MPLAB PM3 Universal Device Programmer |
| Oscillator | Internal 4 MHz RC, external crystal/RC options |
| Data Sheet Document | Microchip PIC16C62X datasheet, document 30222D (per manufacturer listing) |
PIC16C622T-04/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master clear reset input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 5 | RA3/AN3 — PORTA bit 3 / analog input 3 |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/SS/AN4 — PORTA bit 5 / slave select / analog input 4 |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 10 | RC0 — PORTC bit 0 |
| Pin 11 | RC1 — PORTC bit 1 |
| Pin 12 | RC2 — PORTC bit 2 |
| Pin 13 | RC3 — PORTC bit 3 |
| Pin 14 | RC4 — PORTC bit 4 |
| Pin 15 | RC5 — PORTC bit 5 |
| Pin 16 | RC6 — PORTC bit 6 |
| Pin 17 | RC7 — PORTC bit 7 |
| Pin 18 | VSS — Ground reference |
Typical Applications
PIC16C622T-04/SO is suitable for 6 applications: Consumer Appliance Control, Simple Lighting Controllers, Sensor Interface Boards, Replacement of Discrete Logic, Battery-Operated Remote Controls, Educational and Hobbyist Projects.
Consumer Appliance Control
The PIC16C622T-04/SO suits low-cost consumer appliance controllers such as coffee makers, toaster ovens, and small kitchen devices. Its 13 GPIO pins drive relays, triacs, and LED indicators directly, while the 3.5 KB OTP memory holds fixed control firmware for heating element timing, sensor reading, and user-button debouncing. Operating from 3.0-6.0 V and at 4 MHz, it handles typical 10 Hz control loops with substantial margin. The 18-SOIC surface-mount package enables automated PCB assembly at scale.
Recommended
Simple Lighting Controllers
The PIC16C622T-04/SO can serve as the brain in dimmer modules, LED strip controllers, and decorative lighting drivers. Its 13 I/O pins support PWM channels for dimming (via software or external driver ICs), pushbutton inputs, and rotary encoder feedback. The 4 MHz instruction rate allows smooth 8-bit PWM at audio-relevant frequencies above 100 Hz, eliminating visible flicker. The 18-SOIC footprint is industry-standard for retrofit lighting PCBs.
Recommended
Sensor Interface Boards
The PIC16C622T-04/SO acts as a low-cost signal conditioner and protocol converter for analog and digital sensors in HVAC and building automation. Its ADC-compatible I/O pins read thermistor, photocell, or 4-20 mA loop signals, while its GPIO toggles relay outputs or UART lines. With 128 bytes of RAM and 3.5 KB program memory, it can hold calibration tables and simple linearization algorithms. The commercial 0-70 °C temperature range suits indoor installations.
Recommended
Replacement of Discrete Logic
Engineers redesigning legacy discrete-logic timing circuits often replace them with the PIC16C622T-04/SO to reduce PCB area and component count. A single 18-SOIC MCU replaces dozens of 555 timers, flip-flops, and glue logic. The PIC16C62X's 35-instruction RISC set is straightforward for engineers transitioning from discrete designs. Commercial temperature grade and 3-6 V supply tolerance ease drop-in replacement of 5 V logic boards.
Recommended
Battery-Operated Remote Controls
The PIC16C622T-04/SO fits simple IR or RF remote controls where the OTP memory holds the fixed button-to-code mapping. Low-power CMOS design with internal 4 MHz RC oscillator minimizes quiescent draw when the device sleeps between button presses, and the 3.0 V operation suits two-AA-cell supplies. The 13 GPIO lines handle 4x4 keypads or matrix-scanned button arrays with ease. The 18-SOIC package is compatible with hand-solder rework.
Recommended
Educational and Hobbyist Projects
The PIC16C622T-04/SO remains popular in university embedded systems courses and DIY electronics kits. Its PIC16C mid-range core, 35-instruction set, and 14-bit instruction width teach fundamental RISC concepts without overwhelming students. The 18-SOIC is breadboard-friendly with SOIC-to-DIP adapter boards, and MPLAB X IDE with XC8 compiler (or assembly) supports it. Low unit cost makes it ideal for teaching labs requiring one MCU per student workstation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-04/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622T-04I/SO | PIC16C622-04/SO | PIC16C622T-04E/SO | PIC16C621T-04/SO | PIC16C622A-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Program Memory | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 1.75 KB (1K x 14) OTP | 3.5 KB (2K x 14) OTP |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Extended (-40C to +125C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| Supply Voltage | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V |
| Packaging Format | Tape & Reel (T suffix) | Tape & Reel | Tube (no T) | Tape & Reel | Tape & Reel | Tape & Reel |
| Silicon Revision | Original PIC16C622 | Original PIC16C622 | Original PIC16C622 | Original PIC16C622 | PIC16C621 die | PIC16C622A 'A' revision |
Key Differentiators
- Tape-and-reel packaging for high-volume SMD assembly (vs PIC16C622-04/SO)
- Commercial temperature grade with cost advantage (vs PIC16C622T-04I/SO)
- Full 3.5 KB program memory vs smaller PIC16C6XX family members (vs PIC16C621T-04/SO)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 20 on 18-SOIC, pin 17 on the SOIC body) and a bulk capacitor (e.g., 10 µF tantalum or aluminum) on the same power trace. The PIC16C622T-04/SO operates from 3.0 V to 6.0 V and draws typical operating current in the low mA range at 4 MHz; adding 10 µF bulk capacitance prevents supply dips when GPIO banks switch simultaneously and protects against brownouts during high-current load transients.
OTP (One-Time Programmable) memory cannot be erased or rewritten. Every firmware revision requires a fresh device, so fully validate firmware on a flash-equivalent (e.g., PIC16F62X) or a windowed UV-erasable PIC16C622 before committing to OTP production programming. Bug fixes in OTP inventory result in scrapped parts and project delays. Use Microchip's MPLAB PM3 Universal Device Programmer with verified HEX files only.
Keep the 18-SOIC oscillator traces (OSC1/CLKIN on pin 8 and OSC2/CLKOUT on pin 9) as short as possible, surrounded by a ground guard ring or ground pour to reduce EMI susceptibility. Place the crystal or resonator within 5 mm of the OSC pins and avoid routing digital signal traces under or adjacent to the oscillator traces. Use a series resistor (typically 100 Ω to 1 kΩ) on OSC2 if EMI is critical. Per the Microchip PIC16C62X datasheet (document 30222D), proper oscillator layout is the single largest determinant of EMC compliance.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not explicitly confirmed in the verified web data; Microchip's PIC16C series predates widespread RoHS documentation. Conflict minerals compliance per Microchip's standard disclosure program.
