PIC16C65A-04/L - 8-bit 4MHz 7KB OTP MCU 44-PLCC | Microchip
MPN: PIC16C65A-04/L β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.89 | $15.89 |
| 10 | $14.3 | $143.00 |
| 100 | $12.4 | $1,240.00 |
| 500 | $10.8 | $5,400.00 |
| 1,000 | $9.2 | $9,200.00 |
PIC16C65A-04/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. The PIC16C65A-04/L belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor hierarchy, sitting within Microchip's classic mid-range PIC16 architecture widely used in industrial control and embedded designs.
Key features include 35 single-word instructions (most executing in one instruction cycle, with branches in two), a wide operating voltage range, and low power consumption: 5 mA typical at 5 V/4 MHz and 15 uA typical at 3 V/32 kHz. The fully static design allows the clock to be stopped without losing register state, and the device supports commercial, industrial, and extended temperature ranges. The integrated peripherals include timers, an 8-bit A/D converter, USART, and capture/compare/PWM modules.
Architecturally, the PIC16C65A-04/L uses a Harvard-style RISC core with separated program and data buses, enabling simultaneous instruction fetch and operand access. The 14-bit wide program memory word yields more efficient instruction encoding than 8-bit CISC cores, and the OTP EPROM process technology allows one-time factory or in-circuit programming using a standard device programmer.
Typical applications include industrial automation controllers, motor control subsystems, automotive body electronics, smart sensor interfaces, and embedded data acquisition systems. The 33 I/O lines and integrated peripherals make it well suited to medium-complexity embedded designs that need deterministic real-time response.
When designing with this MCU, ensure decoupling capacitors are placed within 5 mm of VDD pins and that unused I/O pins are configured as outputs to minimize current consumption. OTP parts cannot be re-programmed in-circuit; choose a flash-based PIC16F equivalent if firmware revision cycles are anticipated.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC16C65A-04/L that are not aggregated on the manufacturer datasheet alone.
Drop-in alternatives for PIC16C65A-04/L β 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-04/L (same form factor and footprint) β differing in Maximum Clock Frequency, Program Memory Type, Package, Program Memory Size, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65A-04I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-04E/L
β Drop-Inβ In Stock
$11.2 / Unit
View Datasheet βPIC16C65AT-04/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-10/L
β Drop-Inβ In Stock
$9.2 / Unit
View Datasheet βPIC16C66-04/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-04/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Instruction Set | 35 single-word instructions |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM | 192 bytes |
| Maximum Clock Frequency | 4 MHz |
| Operating Voltage Range | 2.5 V to 6.0 V |
| Number of I/O Pins | 33 |
| ADC | 8-bit, integrated |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication | USART (SCI/SPI) |
| PWM Modules | Yes (CCP) |
| Package | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | 0C to +70C (commercial) |
| Power Consumption (sleep, 3V/32kHz) | 15 uA typical |
PIC16C65A-04/L Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / Analog input 2 |
| Pin 2 | RA3/AN3/VREF+ β PORTA bit 3 / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input |
| Pin 4 | RA5/AN4/SS β PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 5 | RE0/RD/AN5 β PORTE bit 0 / Parallel slave port read / Analog input 5 |
| Pin 6 | RE1/WR/AN6 β PORTE bit 1 / Parallel slave port write / Analog input 6 |
| Pin 7 | RE2/CS/AN7 β PORTE bit 2 / Parallel slave port chip select / Analog input 7 |
| Pin 8 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT β Oscillator crystal output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Pin 12 | RC2/CCP1 β PORTC bit 2 / CCP1 (PWM/capture/compare) I/O |
| Pin 13 | RC3/SCK/SCL β PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA β PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO β PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK β PORTC bit 6 / USART async transmit / clock |
| Pin 17 | RC7/RX/DT β PORTC bit 7 / USART async receive / data |
| Pin 18 | GND β Logic and I/O ground reference |
| Pin 19 | VDD β Positive logic supply (2.5 V to 6.0 V) |
| Pin 20 | RB0/INT β PORTB bit 0 / External interrupt input |
| Pin 21 | RB1 β PORTB bit 1 |
| Pin 22 | RB2 β PORTB bit 2 |
| Pin 23 | RB3/PGM β PORTB bit 3 / Low-voltage programming input |
| Pin 24 | RB4 β PORTB bit 4 |
| Pin 25 | RB5 β PORTB bit 5 |
| Pin 26 | RB6/PGC β PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD β PORTB bit 7 / ICSP data |
| Pin 28 | MCLR/VPP β Master clear reset / programming voltage input |
| Pin 29 | RA0/AN0 β PORTA bit 0 / Analog input 0 |
| Pin 30 | RA1/AN1 β PORTA bit 1 / Analog input 1 |
| Pin 31 | GND β Ground reference |
| Pin 32 | RD0 β PORTD bit 0 |
| Pin 33 | RD1 β PORTD bit 1 |
| Pin 34 | RD2 β PORTD bit 2 |
| Pin 35 | RD3 β PORTD bit 3 |
| Pin 36 | RD4 β PORTD bit 4 |
| Pin 37 | RD5 β PORTD bit 5 |
| Pin 38 | RD6 β PORTD bit 6 |
| Pin 39 | RD7 β PORTD bit 7 |
| Pin 40 | VSS β Ground reference (PLCC pin 40 per Microchip pinout) |
| Pin 41 | NC β Not connected (per datasheet) |
| Pin 42 | NC β Not connected (per datasheet) |
| Pin 43 | NC β Not connected (per datasheet) |
| Pin 44 | NC β Not connected (per datasheet) |
Typical Applications
PIC16C65A-04/L is suitable for 6 applications: Industrial Automation Controllers, Motor Control Subsystems, Automotive Body Electronics, Smart Sensor Interfaces, Embedded Data Acquisition Systems, Consumer Appliance Control Boards.
Industrial Automation Controllers
The PIC16C65A-04/L fits industrial automation controllers because its 33 digital I/O pins interface directly to relays, optocouplers, and sensor arrays without external glue logic. The 4 MHz RISC core executes 35 single-word instructions - most in one cycle - delivering deterministic real-time response for PLC scan loops and discrete I/O handling. The integrated 8-bit ADC reads analog sensor signals (temperature, pressure, level) directly, while the USART connects to industrial RS-485 networks via a transceiver. With 7 KB OTP program memory it can host ladder-logic-style control programs. The wide 2.5 V to 6.0 V operating range tolerates industrial 24 V bus-derived supplies after regulation. For best results, add TVS protection on each I/O pin and isolate the MCU with optocouplers from field-side transients.
Recommended
Motor Control Subsystems
The PIC16C65A-04/L is well suited to brushed DC and stepper motor control subsystems thanks to its integrated CCP (Capture/Compare/PWM) modules that generate precise PWM drive signals without CPU overhead. The 4 MHz instruction rate and three hardware timers allow closed-loop velocity control at update rates above 1 kHz. Its 33 I/O pins drive H-bridge gate signals, fault inputs, and encoder feedback simultaneously, while the 8-bit ADC monitors motor current via shunt resistors for current-limit protection. The 192-byte RAM stores PID state variables and run-time telemetry. For three-phase BLDC or higher-power designs, pair this MCU with external gate drivers and use the USART for command/feedback to a host controller.
Recommended
Automotive Body Electronics
The PIC16C65A-04/L is used in automotive body electronics modules such as lighting controllers, seat position memories, and HVAC blend-door actuators where deterministic I/O response is required at moderate cost. Its 33 I/O lines interface to switches, LEDs, and small solenoids while the integrated timers generate PWM dimming signals at frequencies above 100 Hz to avoid perceptible flicker. The 8-bit ADC reads thermistor inputs for cabin temperature control. Designers should specify the industrial-temperature PIC16C65A-04I/L (-40C to +85C) variant for under-dash positions, and add reverse-battery and load-dump protection per ISO 7637. The OTP memory locks firmware permanently, preventing field tampering of safety-related parameters.
Recommended
Smart Sensor Interfaces
The PIC16C65A-04/L functions as a smart sensor front-end that digitizes analog signals, applies linearization, and reports results over a serial bus. Its 8-bit ADC (up to 8 channels) multiplexes multiple sensor inputs - thermocouples, RTDs, load cells - while the 4 MHz core runs calibration tables and digital filters in real time. The USART transmits processed readings in Modbus or custom protocols to a host PLC or data logger. With 7 KB OTP, the firmware can store lookup tables for sensor linearization. The low 15 uA sleep current at 3 V/32 kHz enables battery-powered sensor nodes with multi-year life when duty-cycled. Pair with a precision op-amp front-end for high-accuracy measurements.
Recommended
Embedded Data Acquisition Systems
The PIC16C65A-04/L powers low-channel-count embedded data acquisition systems found in laboratory instruments, environmental monitors, and portable test gear. The integrated 8-bit ADC samples at rates up to approximately 20 kS/s when clocked at 4 MHz, sufficient for vibration, audio-bandwidth, and process-variable logging. The 192-byte RAM forms a circular sample buffer, and the USART streams acquired data to a host PC or SD-card logger. Its 33 I/O lines drive status LEDs, pushbuttons, and LCD interfaces without external logic. Use the timer-capture feature to timestamp events with microsecond resolution. For higher precision, pair with an external 12-/16-bit ADC like the MCP3201 over SPI.
Recommended
Consumer Appliance Control Boards
The PIC16C65A-04/L is found in cost-sensitive consumer appliance control boards such as washing-machine timers, dishwasher cycle controllers, and microwave oven keypads. Its OTP memory locks the firmware against copying while keeping unit cost low for high-volume production runs exceeding 100K units annually. The 33 I/O lines scan 4x4 key matrices, drive 7-segment displays, and switch triac-triggered AC loads via optoisolators. The wide 2.5 V to 6.0 V supply range accepts rectified 5 V or 12 V rails without additional regulators. The integrated PWM module modulates heating elements or universal-motor speed via phase-angle control. Choose the commercial temperature grade (PIC16C65A-04/L) since indoor appliance environments rarely exceed 70C.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65A-04/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-04I/L | PIC16C65A-04E/L | PIC16C65AT-04/L | PIC16C65A-10/L | PIC16C66-04/L |
|---|---|---|---|---|---|---|
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 10 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +125C (extended) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Number of I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Packaging Format | Tube | Tube | Tube | Tape and Reel | Tube | Tube |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Commercial temperature grade with lowest distributor pricing among PIC16C65A family (vs PIC16C65A-04I/L)
- Pin-to-pin compatibility with the higher-memory PIC16C66-04/L enables on-board memory upgrade (vs PIC16C66-04/L)
- Same 4 MHz grade pin-compatible with faster 10 MHz PIC16C65A-10/L for performance upgrade (vs PIC16C65A-10/L)
Design Notes
PIC16C65A-04/L uses OTP (One-Time-Programmable) EPROM - firmware is locked permanently after programming and cannot be erased or rewritten. Engineers commonly confuse OTP with flash and waste prototypes by attempting in-circuit reprogramming. Always validate firmware on a flash equivalent (PIC16F877A) before committing to OTP production parts. Also note that configuration bits (oscillator type, watchdog, brown-out) are part of the OTP image and cannot be changed without a new device. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin, plus a 10 uF bulk capacitor at the board power-entry point.
The 44-pin PLCC package has J-leads on all four sides with 1.27 mm pin pitch, requiring a socket or careful hand-soldering for prototypes. Land patterns should follow IPC-7351 nominal-density PLCC footprints with generous annular rings to survive multiple insertion cycles in low-cost programming sockets. Route the OSC1/OSC2 traces short and symmetric to minimize clock skew; keep the crystal within 5 mm of the OSC pins and guard the traces with a ground pour. Place MCLR pull-up resistor (typically 10 kOhm) close to the pin and add a 100 nF cap to ground for noise immunity - MCLR is sensitive to voltage transients that can cause unintended resets.
Estimated: at 5 V supply with 4 MHz oscillator and all peripherals enabled, active current consumption is approximately 5 mA typical (per family datasheet curves). Power dissipation at full activity is therefore approximately 25 mW, well within the PLCC package's 1 W thermal rating. Sleep mode at 3 V reduces current to roughly 15 uA typical (per datasheet note), enabling battery-backed designs. For lowest-noise analog measurements, place the MCU in sleep mode during ADC conversions and wake via the ADC interrupt - this eliminates digital switching noise from corrupting the analog reading.
Compliance Information
PIC16C65A-04/L is a legacy 1997-era OTP EPROM part predating many modern compliance frameworks. RoHS/REACH/lead-free status not explicitly confirmed in verified distributor data; consult Microchip PCN archives for formal declarations. AEC-Q100 automotive qualification not applicable - automotive designs should specify PIC16C65A-04I/L with extended testing.
