PIC16C62A-20I/SO - 8-bit 20MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C62A-20I/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.65 | $8.65 |
| 10 | $8.12 | $81.20 |
| 100 | $7.45 | $745.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16C62A-20I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces into one package. The PIC16C62A belongs to the PIC16C family of OTP EPROM-based MCUs, which sit in the hierarchy: microcontroller -> embedded processor -> semiconductor IC. These classic PIC16C devices are predecessors to today's flash-based PIC16F series and remain valuable in long-life industrial, automotive aftermarket, and legacy equipment designs where validated firmware is locked into OTP memory and the BOM has been frozen for decades.
Key features of the PIC16C62A-20I/SO include Harvard RISC architecture with 35 single-cycle instructions, a 14-bit wide instruction word, 8-bit data path, and an 8-level deep hardware stack. The part provides two 8-bit timers/counters (Timer0 and Timer2) plus a 16-bit Timer1 with capture/compare support, an analog comparator, a synchronous serial port (SSP) for SPI/I2C, a USART for asynchronous serial communication, and a watchdog timer with its own on-chip RC oscillator for maximum reliability. Wide operating voltage from 2.5V to 6.0V accommodates both 3.3V and 5V rails.
The PIC16C62A-20I/SO is typically used in industrial control panels, sensor interfaces, motor control signal conditioning, automotive aftermarket modules, white-goods appliance controllers, and embedded designs that were prototyped on the flash-based PIC16F62x and then locked into production with the OTP PIC16C62A. Per the Microchip product page, the device is "Not Recommended for new designs" but remains orderable and fully supported for existing production.
A practical design consideration is decoupling: place one 100 nF ceramic plus one 10 uF tantalum or aluminum polymer capacitor as close as possible to the VDD and VSS pins, and use a watch crystal with two 15-33 pF load capacitors for stable operation above 4 MHz. The MCLR reset pin must be pulled high through a 10 kohm resistor for normal operation. Where new designs are planned, prefer the PIC16F62x flash equivalent for in-circuit reprogrammability.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, application notes, and engineering guidance not consolidated on the manufacturer datasheet, giving engineers and procurement teams a one-stop reference for the PIC16C62A-20I/SO.
Drop-in alternatives for PIC16C62A-20I/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 PIC16C62A-20I/SO (same form factor and footprint) — differing in RAM Size, Package, Program Memory Size, Program Memory Type, Oscillator Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C62A-10/SO
✅ Drop-In✓ In Stock
$4.92 / Unit
View Datasheet →PIC16C62A-20I/SS
✅ Drop-In✓ In Stock
$1.8 / Unit
View Datasheet →PIC16C62A-04E/SO
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →PIC16C62B-20I/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F628A-I/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C62A-20I/SO Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC16C RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| EEPROM Size | None |
| Maximum CPU Frequency | 20 MHz |
| Number of I/O Pins | 22 |
| Supply Voltage Range | 2.5 V to 6.0 V |
| Timers | 1 x 8-bit, 1 x 16-bit (with capture/compare) |
| Communication Interfaces | USART, SSP (SPI / I2C) |
| Peripherals | Brown-out Reset, Watchdog Timer, Analog Comparator, POR |
| Oscillator Type | External (crystal/resonator/RC) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| Lead-Free / RoHS | Lead-free, per Microchip product page |
PIC16C62A-20I/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog comparator input |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog comparator input |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog comparator reference input |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog comparator reference input |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/SS/AN4 — PORTA bit 5 / SSP slave select / analog input |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock in |
| Pin 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 14 | VDD — Positive supply |
| Pin 15 | RC3/SCK/SCL — PORTC bit 3 / SSP SPI clock / I2C clock |
| Pin 16 | RC4/SDI/SDA — PORTC bit 4 / SSP SPI data in / I2C data |
| Pin 17 | RC5/SDO — PORTC bit 5 / SSP SPI data out |
| Pin 18 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 19 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 22 | RB1 — PORTB bit 1 |
| Pin 23 | RB2 — PORTB bit 2 |
| Pin 24 | RB3/PGM — PORTB bit 3 / low-voltage programming |
| Pin 25 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 26 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC16C62A-20I/SO is suitable for 6 applications: Industrial Control Panel Logic, Automotive Aftermarket Modules, White-Goods Appliance Controller, Sensor Interface Front-End, Legacy Embedded Communication Bridge, Hobbyist and Educational Retro-Project.
Industrial Control Panel Logic
The PIC16C62A-20I/SO is well suited for industrial control-panel logic where validated OTP firmware has been locked into production for 15+ years. Its 22 digital I/O pins drive relay coils, optocouplers, and 7-segment displays, while the on-chip analog comparator reads 4-20 mA loop signals through a shunt. Operating from 2.5V-6.0V at industrial -40C to +85C, the part handles factory-floor temperature swings and brown-out conditions via the integrated POR and Brown-out Reset. The 20 MHz instruction rate executes deterministic scan loops in well under 1 ms, a hard requirement for safety interlocks.
Recommended
Automotive Aftermarket Modules
Although not AEC-Q100 qualified, the PIC16C62A-20I/SO is widely used in automotive aftermarket modules - alarm systems, gauge clusters, and accessory controllers - that were designed decades ago and remain in service. The 22 I/O count fits typical aftermarket requirements (button matrix + LCD drive + serial telemetry), and the wide 2.5V-6.0V supply range survives the crank-and-load transients of a 12V vehicle bus when properly regulated. For OEM under-hood or safety-critical applications, designers should migrate to an AEC-Q100-qualified PIC16F or dsPIC33 part instead.
Recommended
White-Goods Appliance Controller
Washing machines, dishwashers, and microwave ovens deployed in the late 1990s and 2000s frequently use the PIC16C62A-20I/SO as the main cycle controller. The USART interfaces to an LED or LCD display panel, the SSP bus drives an EEPROM parameter storage, and the analog comparator senses water level or motor current. The OTP memory guarantees that the production firmware cannot be accidentally rewritten in the field - a desirable property for safety-critical appliances where firmware must remain frozen. The 20 MHz clock supports precise timer-based control of heater elements and motor PWM.
Recommended
Sensor Interface Front-End
The PIC16C62A-20I/SO is a compact sensor front-end MCU, reading thermocouples, RTDs, or strain gauges through an external op-amp chain and driving an RS-485 link through the USART. Its 14-bit instruction width and 8-level hardware stack make it easy to express the small linearization lookup tables used for sensor compensation. The Brown-out Reset prevents corrupted readings when the supply sags during inductive switching, and the Watchdog Timer with its own RC oscillator protects against firmware lockups in remote, hard-to-access installations.
Recommended
Legacy Embedded Communication Bridge
Many protocol-bridge designs - serial-to-I2C, RS-232-to-modem, or proprietary-bus gateways - use the PIC16C62A-20I/SO because its USART and SSP (SPI/I2C) peripherals provide the two physical layers needed for the bridge. The 20 MHz throughput is fast enough to keep up with 115200 baud serial without dropped bytes, and the 128 bytes of RAM hold modest buffering for packets in transit. Designers building new bridges should consider the PIC16F628A-I/SO, which adds a hardware USART baud-rate generator for lower software overhead.
Recommended
Hobbyist and Educational Retro-Project
PIC16C62A-20I/SO remains a teaching-grade example of mid-range 8-bit RISC architecture and is used in university embedded-systems labs. Its OTP nature forces students to commit code to a windowed or one-time-programmed part, simulating real production firmware flow. The PIC16C6X family datasheet (336 pages) is also a thorough reference for assembly programming, peripheral configuration, and timing analysis. Hobbyists and instructors building new boards should consider the PIC16F628A-I/SO for the convenience of in-circuit serial programming.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C62A-20I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C62A-10/SO | PIC16C62A-20I/SS | PIC16C62A-04E/SO | PIC16C62B-20I/SO | PIC16F628A-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (wide-body 0.295") | 28-SOIC (wide-body) - same | 28-SSOP - DIFFERENT (narrower body, NOT same land pattern) | 28-SOIC (wide-body) - same | 28-SOIC (wide-body) - same | 28-SOIC (wide-body) - same |
| CPU Speed | 20 MHz | 10 MHz (-50%) | 20 MHz (same) | 4 MHz (-80%) | 20 MHz (same) | 20 MHz (same) |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (reprogrammable) |
| Program Memory Size | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 7 KB flash (4K x 14) - larger |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes (+75%) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Lifecycle Status | NRND (Not Recommended for New Designs) | NRND | NRND | NRND | NRND | Active (recommended for new designs) |
Key Differentiators
- Long-life OTP firmware guarantee (vs PIC16F628A-I/SO (flash))
- Industrial temperature grade as standard (vs PIC16C62A-04E/SO (Extended -40 to +125 C))
- Wide 28-SOIC package for hand-rework and socket compatibility (vs PIC16C62A-20I/SS (28-SSOP))
Design Notes
Place a 100 nF X7R ceramic decoupling capacitor as close as possible to the VDD pin (pin 14), plus a bulk 10 uF tantalum or aluminum polymer capacitor on the same supply rail. The PIC16C62A draws brief switching transients during oscillator edge transitions; the bulk cap prevents VDD droops that can trigger the integrated Brown-out Reset. Estimated steady-state current at 5V/20 MHz is around 15 mA; verify against the PIC16C6X family datasheet electrical characteristics table for your exact operating point.
Route the MCLR/VPP pin (pin 1) directly to a pull-up resistor of 10 kohm to VDD, with no other circuitry hanging off the node except the in-circuit serial programming header. A long MCLR trace picks up capacitive noise and can cause intermittent resets. The OSC1/OSC2 traces should be kept under 10 mm total length and routed away from the USART RX/TX lines to avoid capacitive coupling that distorts the clock waveform.
The PIC16C62A is OTP (One-Time-Programmable), not flash. Code committed to a production unit cannot be erased or updated in-circuit. For field service or firmware revisions, plan for a socketed DIP adapter or migrate to the flash-based PIC16F628A-I/SO. Disabling the Watchdog Timer (configuration bit WDTE) before OTP programming is a frequent factory-floor mistake; the device will reset itself approximately every 18 ms if WDT is left enabled and not periodically cleared in firmware.
Estimated: at 5V VDD, 20 MHz operation, and industrial -40 C to +85 C ambient, the SOIC-28 package dissipates approximately 75 mW internally. With a typical theta_JA of 80 C/W for the wide-body SOIC, the junction temperature rise above ambient is roughly 6 C, well within the 150 C maximum junction rating. No special thermal management is required unless the part is mounted in a fully sealed enclosure with no airflow - in which case derate to 4 MHz or move to a flash equivalent.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the part is industrial-grade only. For automotive under-hood applications, designers must migrate to an AEC-Q100 qualified PIC16F or dsPIC33 part.