PIC16C65A-20/P - 8-Bit 20MHz 7KB OTP MCU 40-PDIP | Microchip
MPN: PIC16C65A-20/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.47 | $5.47 |
| 10 | $4.92 | $49.20 |
| 100 | $4.42 | $442.00 |
| 500 | $4.14 | $2,070.00 |
| 1,000 | $3.85 | $3,850.00 |
PIC16C65A-20/P Overview
An OTP-based microcontroller is a member of the broader microcontroller family (microcontroller -> embedded controller -> semiconductor IC) that integrates a CPU, non-volatile program memory, RAM, and programmable I/O into a single chip. OTP variants are programmed once at production time using a device programmer and cannot be electrically erased, making them a cost-optimized choice for high-volume mature products where firmware is stable.
Key features include 192 bytes of data RAM, 33 digital I/O pins, three timers (Timer0, Timer1, Timer2), a USART for asynchronous serial communications, an 8-bit ADC with 8 channels, and a 5-channel 8-bit PWM/capture/compare peripheral. The wide operating voltage range spans 2.5 V to 6.0 V, with a low-power consumption profile of 15 µA typical at 5 V/4 MHz and 1 µA typical at 3 V/32 kHz, supporting commercial, industrial, and extended temperature grades.
The PIC16C65A-20/P uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access. Its fully static design permits operation at any clock frequency down to DC, simplifying low-power sleep/wake designs. On-chip peripherals are mapped into the data memory space and accessed through standard PIC register files, providing deterministic interrupt response.
Typical applications include industrial control systems, appliance controllers, automotive body electronics, sensor interface boards, and embedded data acquisition front-ends where the OTP memory cost advantage outweighs the need for in-field firmware updates. Specific fits include HVAC damper controllers, vending machine controllers, and simple motor-driver front-ends.
A key design consideration when using PIC16C65A-20/P is firmware provisioning: because OTP memory cannot be erased, code must be 100% validated on a compatible UV-erasable windowed part (PIC16C65A-20/JW) or simulator before committing to the OTP device. Always reserve unused program memory words with explicit goto/end-of-program patterns.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C65A-20/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-20/P (same form factor and footprint) — differing in Package, Core Architecture, Program Memory Size, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65A-10/PQ
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16C65A-04I/P
✅ Drop-In✓ In Stock
$5.25 / Unit
View Datasheet →PIC16C65A-04/P
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →PIC16C65A-04E/L
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC16F74-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C64A-20/P
✅ Drop-In✓ In Stock
$10.1 / Unit
View Datasheet →PIC16C64A-04/P
✅ Drop-In✓ In Stock
$8.05 / Unit
View Datasheet →PIC16C65A-20/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| Maximum CPU Frequency | 20 MHz |
| Operating Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| ADC | 8-bit, 8 channels |
| PWM / CCP Channels | 5 (8-bit) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication | USART (SCI) |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 20 MHz (4 clocks per cycle) |
| Package | 40-pin PDIP (0.600 in, 15.24 mm) |
| Mounting Type | Through-Hole |
| Operating Temperature | 0C to +70C (Commercial, /P suffix) |
| RoHS Status | Non-Compliant (contains lead, PDIP package) |
PIC16C65A-20/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 VREF |
| 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 — Oscillator crystal input / external clock in |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / T1 clock in |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM/capture/compare |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI SCK / I2C SCL |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI SDI / I2C SDA |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI SDO |
| 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 | VSS — Ground |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3 — PORTB bit 3 |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 28 | RD0 — PORTD bit 0 |
| Pin 29 | RD1 — PORTD bit 1 |
| Pin 30 | RD2 — PORTD bit 2 |
| Pin 31 | RD3 — PORTD bit 3 |
| Pin 32 | RD4 — PORTD bit 4 |
| Pin 33 | RD5 — PORTD bit 5 |
| Pin 34 | RD6 — PORTD bit 6 |
| Pin 35 | RD7 — PORTD bit 7 |
| Pin 36 | RE0/AN5 — PORTE bit 0 / analog input 5 |
| Pin 37 | RE1/AN6 — PORTE bit 1 / analog input 6 |
| Pin 38 | RE2/AN7 — PORTE bit 2 / analog input 7 |
| Pin 39 | VSS — Ground |
| Pin 40 | VDD — Positive supply voltage |
Typical Applications
PIC16C65A-20/P is suitable for 6 applications: Industrial Process Control, Appliance Control Boards, Automotive Body Electronics, Vending Machine Controllers, Sensor Interface & Data Acquisition Front-Ends, HVAC Damper and Fan Controllers.
Industrial Process Control
The PIC16C65A-20/P fits industrial process-control front-ends because its 33 I/O pins, 8-channel 8-bit ADC and 5 PWM/CCP channels can drive sensor arrays, solenoid valves and triac-based actuator stages from a single chip. The 20 MHz core runs PID calculations at 200 ns per instruction, well below typical 1 ms loop intervals, leaving margin for housekeeping. Compared with switching to a Flash PIC16F877A-I/P, the OTP C-variant reduces unit cost at high volume once firmware is locked, and the 2.5 V to 6.0 V supply tolerates unregulated 24 V industrial rails after simple regulator drop. Recommended companion parts include the MCP6002 op-amp for sensor conditioning and the MCP1700 LDO for 3.3 V rail generation.
Recommended
Appliance Control Boards
White-goods appliance controllers (washing machines, dishwashers, microwave ovens) typically use PIC16C65A-20/P because OTP memory locks the firmware permanently, eliminating field-tamper risk while keeping BOM cost low. The 33 I/O pins comfortably drive 7-segment displays, keypad matrices, relay coils and zero-cross triac drivers simultaneously. The 5-channel PWM supports motor-speed or heater-power control without external logic, and the USART enables diagnostics over a service-port UART. Recommended companion parts include the ULN2003A Darlington driver for relays and the MOC3021 optotriac for mains switching.
Recommended
Automotive Body Electronics
Body-electronics modules such as window lifters, mirror controllers and simple climate-zone actuators are a classic fit for the PIC16C65A-20/P. Its 8-channel ADC reads multiple position sensors and temperature probes, while PWM channels drive DC motor H-bridges through pre-drivers. Note that for under-hood or safety-critical automotive applications the AEC-Q100 qualified PIC16F877A-I/P is preferred over this commercial-grade part, but for cabin modules the PIC16C65A-20/P offers the right balance of cost and capability. Recommended companion parts include the MCP2515 CAN controller for body-network connectivity and the MCP6004 quad op-amp for analog front-ends.
Recommended
Vending Machine Controllers
Vending machine main boards use PIC16C65A-20/P because the OTP memory locks pricing and audit logic, providing regulatory tamper resistance. The 33 I/O pins drive multi-currency coin acceptors, bill validators, MDB peripherals and a 4x4 keypad plus 16x2 LCD through a single MCU. The 192-byte RAM is sufficient for transaction state, and the USART supports MDB cashless peripherals when the firmware is upgraded to a Flash equivalent. Recommended companion parts include the ICM7211 display driver and the LM358 dual op-amp for bill-validator signal conditioning.
Recommended
Sensor Interface & Data Acquisition Front-Ends
Standalone data-acquisition front-ends for environmental, agricultural or building-automation sensors fit the PIC16C65A-20/P capability profile: 8-channel 8-bit ADC captures multi-sensor arrays, three timers schedule sampling intervals, and the USART streams data to a host PC or wireless module. The 2.5 V to 6.0 V supply range allows direct battery or solar-powered operation, and the low-power profile (1 µA typical at 3 V/32 kHz) supports long sleep intervals between samples. Recommended companion parts include the MCP9700 temperature sensor and the MAX232 RS-232 line driver for legacy host links.
Recommended
HVAC Damper and Fan Controllers
HVAC damper actuator controllers and multi-speed fan drivers benefit from the PIC16C65A-20/P because the 5 PWM/CCP channels generate phase-angle or zero-cross modulated drive signals for triac-based fan tap selection, while the 8-channel ADC monitors duct temperature, humidity and pressure sensors. The 35-instruction RISC core is well understood by HVAC firmware engineers, simplifying IEC 60730 safety compliance through library reuse. Recommended companion parts include the MOC3021 zero-cross optotriac and the MCP6002 op-amp for current-sense amplification.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65A-20/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-10/PQ | PIC16C65A-04I/P | PIC16C65A-04/P | PIC16F74-I/P | PIC16C64A-20/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP (0.600 in) | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash | 4 KB OTP |
| Max CPU Frequency | 20 MHz | 10 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC | 8-bit, 8 ch | 8-bit, 8 ch | 8-bit, 8 ch | 8-bit, 8 ch | 8-bit, 8 ch | 8-bit, 8 ch |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (in-circuit) | OTP EPROM |
| Temperature Range | 0C to +70C | 0C to +70C | -40C to +85C | 0C to +70C | -40C to +85C | 0C to +70C |
Key Differentiators
- Higher speed grade than other PIC16C65A-20/P family members (vs PIC16C65A-04/P)
- More program memory than the PIC16C64A family (vs PIC16C64A-20/P)
- Industrial temperature range option via -04I suffix (vs PIC16C65A-20/P (commercial))
Design Notes
Because PIC16C65A-20/P uses OTP EPROM, every firmware revision requires a new physical part - there is no in-circuit reprogramming path. Always prototype on the windowed CERDIP variant (PIC16C65A-20/JW) or a Flash-compatible PIC16F74-I/P, and only commit the OTP part number once firmware is frozen and validated. Failing to do so leads to scrap on every firmware update, which can exceed $50k at production volumes.
Place a 0.1 µF ceramic decoupling capacitor as close as possible to each VDD pin (pins 11 and 32), with a 10 µF bulk tantalum or aluminum on the same supply trace. Keep the OSC1/OSC2 crystal traces short and shield them with a ground pour to avoid EMI pickup. MCLR/VPP (pin 1) needs a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for proper reset; ICSP programming requires a diode-isolated VPP path so that in-circuit programming does not back-feed the rest of the board.
PORTB pins RB0-RB7 have software-controllable weak pull-ups; enable them on RB0-RB3 for keypad or switch matrix inputs to save external resistors. PORTD is a pure CMOS port without internal pull-ups, so any unused PORTD pin must be tied to VDD or VSS through a 10k resistor to avoid floating-input current spikes that can increase I_DD by up to 1 mA. When using the ADC, switch the digital input buffer off (ANSEL/ADCON1 register) on analog pins to prevent shoot-through current.
Estimated: at VDD=5V, 20 MHz CPU clock, all peripherals enabled and 33 I/O pins driving typical 5 mA loads, the PIC16C65A-20/P draws approximately 15-20 mA total. Sleep current at 3 V with WDT disabled drops to under 1 µA typical, per the Microchip PIC16C6X datasheet. For battery-backed designs, use the brown-out reset (BOR) module to prevent code corruption at low VDD and route the BOR voltage reference through the internal bandgap rather than an external divider to save two resistors.
Compliance Information
PDIP package contains lead (SnPb finish); not RoHS compliant. For RoHS designs, choose PIC16F74-I/P in Pb-free PDIP. REACH and conflict-minerals compliance are maintained per Microchip material declarations.
