PIC16C65A-20I/P - 8-Bit 20MHz 7KB OTP MCU 40-PDIP | Microchip
MPN: PIC16C65A-20I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
PIC16C65A-20I/P Overview
What is an 8-bit OTP microcontroller? It is a single-chip computer that integrates a CPU, non-volatile program memory (here OTP EPROM that is programmed once and cannot be electrically erased), RAM, and peripherals. The PIC16C65A belongs to the mid-range PIC microcontrollers (PIC16 family), sitting in the broader hierarchy: microcontroller -> embedded controller -> semiconductor IC. PIC16C parts use a RISC Harvard architecture with 35 single-word instructions, providing deterministic single-cycle execution (except branches, which take two cycles).
Key features include 20MHz maximum operating frequency (5MHz minimum at 4V), wide operating voltage from 2.5V to 6.0V, ultra-low power consumption of 15uA typical at 5V/4MHz and 1uA typical at 3V/32kHz, three hardware timers, an 8-bit A/D converter with 8 input channels, two PWM modules, a USART, and a synchronous serial port (SSP) supporting SPI and I2C. The 40-pin PDIP package is windowed ceramic for prototype development.
The PIC16C65A uses a fully-static CMOS design with separate instruction and data buses (Harvard architecture), 14-bit wide instructions, and an 8-bit data path. Its high-performance RISC core executes most instructions in a single clock cycle, providing 5 MIPS sustained throughput at 20MHz. On-chip peripherals include a watchdog timer with its own on-chip RC oscillator, brown-out reset, and power-on reset.
Typical applications include industrial control systems, motor control, instrumentation, automotive body electronics (non-safety), consumer appliances, and legacy embedded products that require OTP memory for low-cost, high-volume production. The wide voltage range and low-power modes suit battery-backed instrumentation.
When designing with this part, note that OTP memory cannot be erased, so firmware bugs require windowed ceramic packages for UV erasure during development. Engineers should use the flash-based PIC16F77 or PIC16F877A for new designs; the PIC16C65A remains in service for legacy and long-lifecycle industrial products.
This page synthesizes distributor stock, parametric comparison with the flash-based PIC16F77 drop-in successor, and practical design notes for engineers maintaining installed bases.
Drop-in alternatives for PIC16C65A-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 PIC16C65A-20I/P (same form factor and footprint) — differing in Package, RoHS Status, Timers, Core Architecture, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65A-20I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C65A-20/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.85 / Unit
View Datasheet →PIC16C65A-04I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.25 / Unit
View Datasheet →PIC16C65A-20E/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$11.85 / Unit
View Datasheet →PIC16C65A-20E/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.85 / Unit
View Datasheet →PIC16F77-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C65A-20I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16 RISC, Harvard |
| Program Memory | 7KB (4K x 14) OTP EPROM |
| RAM | 192 bytes |
| Data EEPROM | Not present (OTP only) |
| Maximum Clock Speed | 20 MHz |
| Instruction Set Size | 35 instructions (14-bit wide) |
| Operating Voltage | 2.5 V to 6.0 V |
| Typical Supply Voltage | 5 V |
| I/O Pins | 33 |
| A/D Converter | 8-bit, 8 channels |
| PWM Modules | 2 (Capture/Compare/PWM) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication | USART (SCI), SSP (SPI/I2C) |
| Package | 40-pin PDIP (WDIP), windowed ceramic |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Mounting Type | Through-Hole |
| Power Consumption (typ) | 15 uA at 5 V / 4 MHz; 1 uA at 3 V / 32 kHz |
| RoHS Status | Compliant |
PIC16C65A-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 / Voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — Crystal oscillator input / External clock in |
| Pin 9 | OSC2/CLKOUT — Crystal oscillator output / Clock out |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 PWM output |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 18 | GND — Ground reference |
| 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 (RD4)/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 24 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 25 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 26 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 27 | VSS — Ground (second pin) |
| Pin 28 | VDD — Positive supply voltage |
| Pin 29 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 30 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 31 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Pin 32 | VSS — Ground (third pin) |
| Pin 33 | VDD — Positive supply (second pin) |
| Pin 34 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 35 | RB1 — PORTB bit 1 |
| Pin 36 | RB2 — PORTB bit 2 |
| Pin 37 | RB3 — PORTB bit 3 |
| Pin 38 | RB4 — PORTB bit 4 |
| Pin 39 | RB5 — PORTB bit 5 |
| Pin 40 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 41 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC16C65A-20I/P is suitable for 6 applications: Industrial Process Control, Motor Control and PWM Drives, Instrumentation and Data Acquisition, Consumer Appliance Control, Automotive Body Electronics (Non-Safety), Legacy Embedded Product Maintenance.
Industrial Process Control
The PIC16C65A-20I/P is well-suited for industrial process controllers and PLCs, providing 33 I/O lines for sensor acquisition and actuator drive, three timers for PWM motor speed control, and a USART for SCADA network communications. Its industrial -40C to +85C temperature range tolerates factory floor conditions, while 5V operation interfaces directly with 5V logic level sensors and 24V industrial signal conditioning circuits through optocouplers. The OTP memory is well-matched to fixed-function industrial equipment with stable firmware, eliminating the need for in-field firmware updates.
Recommended
Motor Control and PWM Drives
Two Capture/Compare/PWM (CCP) modules make the PIC16C65A-20I/P a fit for small DC motor control and brushed motor drives. The 8-bit PWM resolution (with 10-bit option via Timer2 configuration) drives MOSFET half-bridges through gate drivers, while the three timers handle quadrature encoder feedback and tachometer sampling. 20MHz clock rate provides 50ns instruction cycle for tight control loops. The wide 2.5-6V operating range accommodates battery-powered or bus-powered motor applications.
Recommended
Instrumentation and Data Acquisition
The on-chip 8-bit A/D converter with 8 input channels enables the PIC16C65A-20I/P to digitise analog signals from temperature sensors, pressure transducers, and potentiometers. With 19.5us conversion time at 20MHz, the part samples up to 50ksps aggregate, suitable for low-bandwidth sensor networks. The 192-byte RAM supports small data buffers and rolling averages, while the USART streams data to host PCs or remote displays. Industrial temperature grade and low power consumption (15uA active at 5V/4MHz) suit battery-backed field instruments.
Recommended
Consumer Appliance Control
Washing machines, dishwashers, microwave ovens, and HVAC controls benefit from the PIC16C65A-20I/P's combination of OTP memory (low unit cost for high volume) and robust peripheral set. The 33 I/O lines drive keypads, LED/LCD displays, relays, and triac optocouplers, while the USART supports module-to-module communication in appliance networks. The 5V operation and industrial temperature range handle appliance thermal environments. OTP memory is ideal when firmware is fixed at production and no field updates are required.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC16C65A-20I/P suits legacy automotive body electronics such as climate control panels, instrument clusters, and accessory modules. The 5V supply aligns with traditional automotive electrical systems, and the industrial -40C to +85C temperature range handles under-dash environments. CAN bus networking is achieved by adding an external MCP2515 CAN controller via SPI. Note that AEC-Q100 qualification is not specified for this part; for safety-critical automotive applications, select AEC-Q100 qualified alternatives.
Recommended
Legacy Embedded Product Maintenance
Installed-base products originally designed with the PIC16C65A-20I/P require ongoing spare-part availability for warranty and service replacements. The long-term production commitment from Microchip, combined with multiple package variants (PDIP, TQFP, PLCC) and speed grades (4, 10, 20 MHz), allows repair depots to source exact replacements for legacy systems. The mature tooling ecosystem (MPASM, MPLAB IDE v5 through v8) supports continued firmware maintenance for these long-life products.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65A-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F77-I/P | PIC16C65A-20/P | PIC16C65A-04I/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 | 7KB (4K x 14) | 7KB Flash | 7KB (4K x 14) | 7KB (4K x 14) |
| RAM | 192 bytes | 368 bytes | 192 bytes | 192 bytes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 4 MHz |
| Operating Voltage | 2.5 V to 6.0 V | 2.0 V to 5.5 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| A/D Converter | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels |
| ICSP Support | No (OTP only) | Yes (Flash) | No (OTP only) | No (OTP only) |
Key Differentiators
- OTG legacy compatibility with PIC16C6X family (vs PIC16F77-I/P)
- Higher maximum clock speed than 04-grade parts (vs PIC16C65A-04I/P)
- Industrial temperature range for harsh environments (vs PIC16C65A-20/P)
Design Notes
OTP EPROM cannot be electrically erased. During development use the windowed ceramic CERDIP variant (PIC16C65A-20I/W or PIC16C65A-20I/JW) which allows UV erasure with a 30-60 minute exposure to UV light through the package window. The plastic PDIP PIC16C65A-20I/P has no window and is a one-time-programmable production package - a firmware bug means scrap. Always qualify firmware on the windowed variant before committing to OTP volume production.
Estimated: at 5V supply and 20MHz clock, the PIC16C65A-20I/P draws about 5-15mA active, depending on I/O loading and peripheral use. For battery-backed designs use the Sleep mode (current <1uA typical) and wake via Watchdog Timer, external interrupt on RB0/INT, or peripheral interrupt. Brown-Out Reset (BOR) is recommended for industrial applications to prevent undefined operation during supply droop; configure BOR via configuration bits at programming time.
Place the decoupling capacitor (0.1uF ceramic) within 5mm of the VDD pin (pin 28 or 33) with a short trace to the nearest ground. For designs using the parallel slave port (PORTD) at high speed, add a 10uF bulk capacitor near the IC. The crystal or resonator should be located within 10mm of OSC1/OSC2 (pins 8/9) with grounded guard traces on long clock traces to reduce EMI susceptibility.
The 40-pin PDIP footprint uses 2.54mm (0.100 inch) pin pitch and 0.600 inch (15.24mm) row spacing, compatible with standard through-hole PCB prototyping and wire-wrap sockets. For production consider using a TQFP-44 variant (PIC16C65A-20I/PT) for surface-mount assembly. The ICSP pins RB6/PGC (pin 40) and RB7/PGD (pin 41) are usable for in-system programming if migrating to a flash successor like PIC16F77.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. Not AEC-Q100 qualified - for safety-critical automotive applications select AEC-Q100 qualified PIC16F family alternatives.
