PIC16C622-20E/P - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C622-20E/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.72 | $272.00 |
| 500 | $2.39 | $1,195.00 |
| 1,000 | $2.14 | $2,140.00 |
PIC16C622-20E/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/OTP/Flash), working RAM, and peripheral interfaces (GPIO, timers, ADC, communication) into one device. The PIC16C family sits in the hierarchy: microcontroller -> embedded MCU -> 8-bit RISC MCU -> semiconductor IC. OTP-based PIC16C parts are programmed once at production and retain code permanently, making them suitable for high-volume, cost-sensitive, fixed-function products where firmware will not change in the field.
Key differentiating features of the PIC16C622-20E/P include its 20 MHz maximum clock (200 ns instruction cycle), 14-bit instruction word with single-cycle ALU operations, a hardware analog comparator module, and 13 GPIO pins arranged across ports A and B. The device offers low-power CMOS operation with sleep/idle modes, internal brown-out reset, watchdog timer, and power-on reset support.
Architecturally, the PIC16C622-20E/P uses Microchip's enhanced mid-range 8-bit RISC core with a hardware multiplier absent, a 14-bit program counter, and a Harvard-style separate program and data bus. Its peripherals include one 8-bit timer (TMR0) and one 16-bit timer (TMR1) with capture/compare, plus the analog comparator block for sensor interfacing.
Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, battery chargers, and industrial control modules. The 18-pin PDIP package with through-hole leads suits hand-soldered prototypes, educational platforms, and through-hole production runs.
A key design consideration is that the OTP memory is one-time programmable and cannot be erased, so production programming requires a validated firmware image. Engineers should plan for a Flash-based PIC16F equivalent for field updates and prototypes, while reserving the PIC16C622-20E/P for fixed-code, high-volume production.
This page synthesizes real-time distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers and buyers evaluate the PIC16C622-20E/P for new designs and EOL replacements.
Drop-in alternatives for PIC16C622-20E/P — 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 PIC16C622-20E/P (same form factor and footprint) — differing in Package, Program Memory Type, Program Memory Size, Core Architecture, Instruction Cycle Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-20/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.1 / Unit
View Datasheet →PIC16C622-04/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C621-20E/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C620-20E/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.12 / Unit
View Datasheet →PIC16F627-20/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-20E/P Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC RISC |
| Instruction Word | 14-bit |
| Maximum Clock Frequency | 20 MHz |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 x 8 bytes |
| Number of I/O Pins | 13 |
| Package | 18-PDIP (0.300 inch, 7.62 mm) |
| Supply Voltage | 3.0 V to 5.5 V |
| Operating Temperature Range | -40C to +125C (Extended, "E" grade) |
| Mounting Type | Through-Hole (THT) |
| Timer Modules | TMR0 (8-bit), TMR1 (16-bit) |
| Analog Comparator | Yes (2 comparators) |
| Watchdog Timer | Yes |
| Brown-out Reset | Yes |
| Automotive Grade | Automotive temperature grade (per Partstack listing) |
PIC16C622-20E/P Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP — Master clear (reset) input / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / external interrupt input |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C622-20E/P is suitable for 6 applications: Automotive Body Control Modules, Home Appliance Control Boards, Battery Charger Controllers, Industrial Sensor Interface Modules, Educational and Hobby Electronics, Security and Access Control Panels.
Automotive Body Control Modules
The PIC16C622-20E/P suits automotive body control applications such as lighting controllers, wiper timers, and accessory multiplexers. Its extended -40C to +125C operating range handles under-hood and cabin thermal stress, and the 20 MHz core delivers 5 MIPS of processing for real-time switch debouncing and relay driving. The two on-chip analog comparators monitor current-sensing shunts for fault detection in body modules. With 13 GPIO pins and OTP memory for fixed firmware, this MCU is widely deployed in automotive body ECUs across decades of vehicle production.
Recommended
Home Appliance Control Boards
White goods and small appliances use the PIC16C622-20E/P as a fixed-function controller in washing machines, dishwashers, microwave ovens, and HVAC thermostats. The 14-bit instruction set executes motor-control loops and user-interface debouncing efficiently at 20 MHz. OTP memory locks firmware against accidental erasure in high-vibration environments. The 18-PDIP package simplifies manual rework on appliance production lines and supports hand-soldered low-volume SKUs common in appliance manufacturing.
Recommended
Battery Charger Controllers
Sealed lead-acid and NiMH charger designs use the PIC16C622-20E/P to implement CC/CV charge profiles, temperature monitoring, and LED status indication. The two analog comparators provide precise voltage and current threshold detection without an external ADC, reducing BOM cost. At 20 MHz the MCU computes PWM duty cycles for switch-mode charger topologies. The OTP memory locks the charge algorithm once validated, ensuring regulatory compliance and preventing field tampering with safety-critical parameters.
Recommended
Industrial Sensor Interface Modules
Industrial 4-20 mA loop-powered sensor transmitters and thermocouple conditioners use the PIC16C622-20E/P to digitize analog signals and provide linearization, scaling, and HART-style communication. The two on-chip comparators enable window-detection and alarm threshold monitoring in process-control applications. Extended temperature operation supports outdoor and factory-floor deployment. The 18-PDIP package and OTP firmware simplify ATEX/IECEx certified designs where firmware changes are forbidden in hazardous locations.
Recommended
Educational and Hobby Electronics
Universities, technical schools, and electronics hobbyists use the PIC16C622-20E/P for embedded systems coursework and breadboard prototyping. The 18-PDIP through-hole package fits standard 0.300 inch IC sockets and solderless breadboards, simplifying lab use. The classic PIC16C mid-range core is well-documented in textbooks and free development tools, including MPLAB X IDE with Hi-Tech C or MPASM assembler. OTP memory encourages disciplined firmware development since students cannot iterate after programming.
Recommended
Security and Access Control Panels
Alarm panels, keypads, and door-access controllers use the PIC16C622-20E/P for fixed-code firmware managing PIN entry, relay output, and supervised sensor loops. The hardware analog comparators enable direct monitoring of end-of-line resistors used in security wiring. The 14-bit instruction set executes scan loops for multiple zones within microseconds. OTP memory secures the firmware image against reverse engineering, important for anti-tamper applications in commercial security installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20/P | PIC16C622-04/P | PIC16C621-20E/P | PIC16C620-20E/P | PIC16F627-20/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-PDIP | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same | 18-PDIP - same |
| Program Memory | 3.5 KB (2K x 14) OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 512 x 14 OTP (smaller) | 1.75 KB Flash (reprogrammable) |
| Max Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| GPIO Pins | 13 | 13 | 13 | 13 | 13 | 16 |
| Analog Comparators | 2 | 2 | 2 | 0 (not present) | 0 (not present) | 2 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (reprogrammable) |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Standard) | 0C to +70C (Standard) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
Key Differentiators
- Includes on-chip dual analog comparators (vs PIC16C621-20E/P)
- Highest speed grade in the 18-PDIP family (vs PIC16C622-04/P)
- Extended industrial temperature range (vs PIC16C622-20/P)
- Drop-in 18-PDIP form factor for legacy designs (vs PIC16F627-20/P)
Design Notes
OTP (One-Time Programmable) memory cannot be electrically erased. Once the PIC16C622-20E/P is programmed with a faulty firmware image, the part must be discarded. Always validate firmware on a Flash-based equivalent (such as PIC16F627) before committing to production programming. Maintain a documented firmware golden image and use a Microchip-approved device programmer (e.g., MPLAB PM3) with verified programming parameters to prevent partial-program errors.
The PIC16C622-20E/P operates from 3.0 V to 5.5 V with brown-out reset support. Add a 100 nF decoupling capacitor as close as possible to VDD (pin 14) and a bulk capacitor (10 uF or larger) on the supply rail. The MCLR/VPP pin (pin 4) should have a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS for proper reset behavior during power-up. When programming, VPP must reach 13.0 V minimum per Microchip programming specifications.
For through-hole assembly using the 18-PDIP package, drill 0.038 inch (0.97 mm) plated through-holes on a 2.54 mm (0.100 inch) pitch with 7.62 mm (0.300 inch) row spacing. Use a socket (e.g., 3M 218-3341-00-1102) during development to allow easy swap-out. Add a 4-pin header (VDD, VSS, OSC1, OSC2) to support in-circuit emulation with MPLAB ICE. Keep the crystal/oscillator traces short and away from switching signals to avoid EMI coupling.
Route the OSC1/OSC2 crystal traces symmetrically with ground guarding to minimize EMI pickup. Keep analog comparator inputs (RA0, RA1, RA2, RA3, RA4 with comparator disabled) away from digital switching signals. If using the analog comparators, add RC low-pass filters on the comparator input pins to suppress high-frequency noise. The MCLR pin trace should be short to avoid false resets from EMI. Ground plane on the bottom layer is recommended for stable operation.
Compliance Information
RoHS compliance status not stated in verified web data; marked [DATA_NEEDED]. The part is listed as Automotive temperature grade per Partstack listing but AEC-Q100 qualification status was not confirmed in available data. Microchip publishes an overall Conflict Minerals Compliance Statement covering PIC microcontrollers.
