PIC16C67-20I/P - 8-Bit 20MHz 14KB OTP MCU 40-PDIP | Microchip
MPN: PIC16C67-20I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.55 | $75.50 |
| 100 | $6.78 | $678.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC16C67-20I/P Overview
What is an 8-bit OTP microcontroller? An 8-bit OTP (One-Time-Programmable) microcontroller is a small programmable computer on a single IC that executes instructions 8 bits at a time and stores its program in non-volatile memory that can be written exactly once. Within the broader taxonomy, OTP microcontrollers sit under the category of embedded microcontrollers, which themselves belong to microcontrollers, integrated circuits, and finally semiconductors. OTP parts are typically lower cost than flash or EEPROM equivalents and are widely used in high-volume consumer and industrial products where firmware is finalised before production.
The PIC16C67-20I/P executes instructions in a single 200 ns cycle (except program branches which take two cycles) at 20 MHz, and features a fully static design that allows the clock to be stopped without losing register state. It integrates three timer/counters, a synchronous serial port (SSP) supporting SPI and I²C, a USART, an 8-bit ADC with up to 8 channels, a parallel slave port, and a capture/compare/PWM module, providing substantial on-chip peripherals for the era. The OTP program memory, RISC architecture, and rich peripheral set make this MCU a strong choice for embedded control designs where deterministic execution is required.
Typical applications include industrial automation controllers, sensor interfacing front-ends, motor-control front-ends, automotive body electronics, consumer appliances, and low-cost embedded control boards that must operate reliably across wide temperature and voltage ranges. The 40-pin PDIP package is also friendly for prototyping, educational platforms, and legacy equipment maintenance. When designing with this device, ensure the part is programmed before PCB assembly or via the ICSP interface, because OTP memory cannot be erased or rewritten after the programming event.
Drop-in alternatives for PIC16C67-20I/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 PIC16C67-20I/P (same form factor and footprint) — differing in Package, Program Memory Type, Mounting Type, Program Memory Size, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F877-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C67-20/PT
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →PIC16C67-10I/PT
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC16C67-20I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C6x 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| RAM Size | 368 bytes |
| Maximum CPU Clock | 20 MHz |
| Instruction Cycle Time | 200 ns (single-cycle instructions) |
| Instruction Set Size | 35 single-word instructions |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Pins | 33 |
| Timers | 3 (Timer0, Timer1, Timer2) |
| ADC | 8-bit, up to 8 channels |
| Communication Peripherals | USART, SSP (SPI/I²C) |
| Package | 40-pin PDIP (0.600 inch, 15.24 mm) |
| Operating Temperature Range | Industrial (-40°C to +85°C) |
| Mounting Type | Through-Hole (DIP) |
PIC16C67-20I/P 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/VREF — PORTA bit 3 / analog input 3 / ADC reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SSP slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / parallel slave port read / analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / parallel slave port write / analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / parallel slave port chip select / analog input 7 |
| Pin 11 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKO — Oscillator crystal output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I²C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I²C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / low-voltage ICSP programming input |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data I/O |
Typical Applications
PIC16C67-20I/P is suitable for 6 applications: Industrial Automation Controllers, Sensor Interfacing Front-Ends, Motor Control Front-Ends, Automotive Body Electronics, Consumer Appliance Control, Educational and Prototyping Platforms.
Industrial Automation Controllers
The PIC16C67-20I/P suits industrial automation controllers that require deterministic 8-bit processing at 20 MHz with 33 I/O lines for sensors, relays, and switches. Its 14 KB OTP memory is large enough for multi-state machine firmware, while the three timer/counters drive PWM outputs for motor or valve control. The industrial -40°C to +85°C temperature range handles factory-floor environments, and the 40-pin PDIP package simplifies prototyping and field replacement on legacy equipment.
Recommended
Sensor Interfacing Front-Ends
For sensor front-ends combining digital I/O with analog inputs, the PIC16C67-20I/P offers an integrated 8-bit ADC with up to 8 channels plus a USART for digital telemetry. The 368 bytes of RAM handle modest sensor buffering, and the SSP module supports SPI/I²C sensors directly. Its 5 V supply and industrial temperature rating suit process-control and environmental monitoring deployments where deterministic sampling at 20 MHz matters.
Recommended
Motor Control Front-Ends
The PIC16C67-20I/P works well as a motor-control front-end, using its CCP module for PWM generation and three timers for back-EMF sensing and commutation timing. The 20 MHz instruction rate provides 200 ns resolution, sufficient for trapezoidal BLDC commutation and stepper acceleration profiles. The 33 digital I/O pins drive gate drivers, H-bridges, and encoder inputs while the USART links to higher-level controllers for closed-loop coordination.
Recommended
Automotive Body Electronics
Inside automotive body modules such as lighting controllers, seat controllers, or HVAC interfaces, the PIC16C67-20I/P provides the 8-bit processing headroom and I/O count needed for relay driving, switch scanning, and LIN-style UART communication. The industrial temperature range tolerates under-dash thermal conditions, and the OTP memory secures final firmware at a low unit cost. The PIC16C67 family is widely used in mature automotive subsystems where firmware stability matters more than field updates.
Recommended
Consumer Appliance Control
White-goods and small appliance controllers use the PIC16C67-20I/P because it integrates timers, ADC, USART, and I/O in a single 5 V 40-pin PDIP that fits appliance PCBs economically. The OTP memory prevents accidental firmware tampering in the field, and the 200 ns instruction cycle supports real-time tasks like button debouncing, triac zero-crossing control, and sensor sampling. The 33 I/O lines drive seven-segment displays, keypads, and load-switching transistors without external logic.
Recommended
Educational and Prototyping Platforms
The PIC16C67-20I/P is widely adopted in university microcontroller courses and DIY prototyping boards because the 40-pin PDIP is breadboard-friendly and the PIC16C6x RISC architecture has only 35 instructions, easing the learning curve. The ICSP interface allows programming without removing the part, and the rich peripheral set (USART, SSP, ADC, CCP) provides a complete teaching platform for embedded concepts including interrupts, timers, and serial communication.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C67-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877-20I/P | PIC16C67-20/P | PIC16C67-10I/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Program Memory Type | OTP EPROM | Flash | OTP EPROM | OTP EPROM |
| Program Memory Size | 14 KB (8K x 14) | 14 KB | 14 KB | 14 KB |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 10 MHz |
| Temperature Range | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C |
| Reprogrammability | No (OTP, one-time programmable) | Yes (flash, >1000 cycles) | No (OTP) | No (OTP) |
| I/O Pins | 33 | 33 | 33 | 33 |
Key Differentiators
- Wide industrial temperature range in OTP silicon (vs PIC16C67-20/P)
- 20 MHz instruction throughput in 40-pin PDIP (vs PIC16C67-10I/P)
- Lowest unit cost via OTP memory in proven 8-bit core (vs PIC16F877-20I/P)
Design Notes
The PIC16C67-20I/P requires a stable 4.5 V to 5.5 V supply on both VDD pins (pins 11 and 32) with decoupling capacitors placed within a few millimetres of each VDD pin. Recommended values are 100 nF ceramic in parallel with 10 µF tantalum or aluminium polymer on the board-level supply. Brown-out detection and EPROM programming margins both rely on a clean rail; noisy supplies can cause OTP programming failures or spurious resets.
Because program memory is OTP, any bit written in error cannot be erased. Stage firmware in the flash-based PIC16F877-20I/P (same 40-pin PDIP footprint) for development, and only move to the PIC16C67-20I/P once firmware is fully validated. Plan ICSP programming fixtures and verify the programming waveform on the MCLR/VPP, RB6/PGC, and RB7/PGD lines before committing to volume programming.
Place the 20 MHz crystal or resonator close to pins 13 (OSC1) and 14 (OSC2), keeping trace lengths short and guarding both traces with a ground ring to reduce EMI coupling. Keep high-current switching traces (relay drives, triac control) away from the oscillator traces and analog inputs on PORTA. Add a 100 Ω resistor in series with the MCLR line if the pin is driven by a pushbutton or external supervisor, to limit inrush current.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified for automotive; Microchip recommends the PIC16F877A-I/P for automotive-grade designs.
