PIC16C65A-04E/L - 8-bit OTP MCU, 7KB EPROM, 33 I/O, 44-PLCC | Microchip
MPN: PIC16C65A-04E/L β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.95 | $169.50 |
| 100 | $14.8 | $1,480.00 |
| 500 | $12.9 | $6,450.00 |
| 1,000 | $11.2 | $11,200.00 |
PIC16C65A-04E/L Overview
A microcontroller (MCU) is a single-chip computer that combines a CPU, memory, and programmable peripherals. The PIC16C6X family uses a Harvard-architecture RISC core with only 35 single-word instructions, where all instructions execute in a single cycle except program branches (two cycles). This simplified instruction set enables deterministic timing and compact code density, making PIC MCUs popular for embedded control, instrumentation, and legacy industrial designs.
Key features of the PIC16C65A-04E/L include 8-channel 8-bit ADC, two 8-bit timers plus one 16-bit timer with capture/compare/PWM, a synchronous/asynchronous USART with addressable SPI/I2C master mode, and a programmable watchdog timer with its own on-chip RC oscillator. The device supports commercial, industrial, and extended temperature ranges, with the "/L" suffix indicating the PLCC package and "-04E" indicating the 4 MHz extended-temperature speed grade.
Typical applications include industrial control logic, motor drive interfaces, sensor signal conditioning, and legacy embedded systems where EPROM-based, windowed-ceramic parts are required for in-circuit reprogramming during development or field service. The high number of I/O pins (33) supports keypad scanning, LED multiplexing, and parallel bus expansion.
When designing with this device, designers should account for the 4 MHz maximum oscillator at 5V and verify that the chosen timer/capture bandwidth is sufficient for the target application. The windowed ceramic package allows UV erasure, which is useful for prototyping but typically not for volume production; for that, consider the OTP-only or flash-based PIC16F equivalent family members.
Drop-in alternatives for PIC16C65A-04E/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-04E/L (same form factor and footprint) β differing in Package, Timers, Program Memory Type, Mounting Type, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65A-04/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-04I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16F65-I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65B-04E/L
β Drop-Inβ In Stock
$10.85 / Unit
View Datasheet βPIC16C64A-04E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C642-04I/SP
β Drop-Inβ In Stock
$4.95 / Unit
View Datasheet βPIC16C63A-04/SO
β Drop-Inβ In Stock
$5.75 / Unit
View Datasheet βPIC18F458-E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-04E/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16 RISC |
| Instruction Set | 35 single-word instructions |
| Program Memory Type | EPROM (OTP, UV-erasable windowed) |
| Program Memory Size | 7 KB |
| RAM | 192 bytes |
| I/O Pins | 33 |
| Maximum Clock Frequency | 10 MHz (4 MHz at 5V specified by "-04" speed grade) |
| Supply Voltage | 4.0 V to 5.5 V |
| ADC | 8-channel, 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit with CCP |
| Communication Peripherals | USART (SCI) with SPI / I2C master mode |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Package | 44-pin PLCC (J-Lead), windowed ceramic |
| Operating Temperature | -40C to +125C (Extended grade) |
| Mounting Type | Surface Mount |
PIC16C65A-04E/L Pin Configuration
| Pin 1 | MCLR/VPP β Master Clear (reset) input / VPP for EPROM programming |
| Pin 2 | OSC1 β Oscillator input / external clock input |
| Pin 3 | OSC2 β Oscillator output / clock out in RC mode |
| Pin 4 | RA0/AN0 β Port A bit 0 / analog input 0 |
| Pin 5 | RA1/AN1 β Port A bit 1 / analog input 1 |
| Pin 6 | RA2/AN2 β Port A bit 2 / analog input 2 |
| Pin 7 | RA3/AN3/VREF β Port A bit 3 / analog input 3 / ADC VREF |
| Pin 8 | RA4/T0CKI β Port A bit 4 / Timer 0 clock input |
| Pin 9 | RA5/AN4/SS β Port A bit 5 / analog input 4 / SPI slave select |
| Pin 10 | VSS β Ground reference |
| Pin 11 | VDD β Positive supply voltage (4.0V to 5.5V) |
| Pin 12 | RB0/INT β Port B bit 0 / external interrupt |
| Pin 13 | RB1 β Port B bit 1 |
| Pin 14 | RB2 β Port B bit 2 |
| Pin 15 | RB3 β Port B bit 3 |
| Pin 16 | RB4 β Port B bit 4 |
| Pin 17 | RB5 β Port B bit 5 |
| Pin 18 | RB6/PGC β Port B bit 6 / ICSP clock |
| Pin 19 | RB7/PGD β Port B bit 7 / ICSP data |
| Pin 20 | RC0/T1OUT β Port C bit 0 / Timer 1 oscillator output |
| Pin 21 | RC1/T1CKI/CCP2 β Port C bit 1 / Timer 1 clock / CCP2 |
| Pin 22 | RC2/CCP1 β Port C bit 2 / Capture/Compare/PWM 1 |
| Pin 23 | RC3/SCK/SCL β Port C bit 3 / SPI clock / I2C clock |
| Pin 24 | RC4/SDI/SDA β Port C bit 4 / SPI data in / I2C data |
| Pin 25 | RC5/SDO β Port C bit 5 / SPI data out |
| Pin 26 | RC6/TX/CK β Port C bit 6 / USART TX / clock |
| Pin 27 | RC7/RX/DT β Port C bit 7 / USART RX / data |
| Pin 28 | RD0 β Port D bit 0 |
| Pin 29 | RD1 β Port D bit 1 |
| Pin 30 | RD2 β Port D bit 2 |
| Pin 31 | RD3 β Port D bit 3 |
| Pin 32 | RD4 β Port D bit 4 |
| Pin 33 | RD5 β Port D bit 5 |
| Pin 34 | RD6 β Port D bit 6 |
| Pin 35 | RD7 β Port D bit 7 |
| Pin 36 | RE0/AN5 β Port E bit 0 / analog input 5 |
| Pin 37 | RE1/AN6 β Port E bit 1 / analog input 6 |
| Pin 38 | RE2/AN7 β Port E bit 2 / analog input 7 |
| Pin 39 | VSS β Ground reference |
| Pin 40 | VDD β Positive supply voltage |
| Pin 41 | NC β Not connected |
| Pin 42 | NC β Not connected |
| Pin 43 | NC β Not connected |
| Pin 44 | NC β Not connected |
Typical Applications
PIC16C65A-04E/L is suitable for 7 applications: Industrial Control Logic, Motor Drive Interface Controller, Sensor Signal Conditioning Hub, Legacy Embedded System Maintenance, Keypad and LED Multiplex Display, Automotive Aftermarket ECU, Communication Protocol Bridge.
Industrial Control Logic
The PIC16C65A-04E/L fits industrial control logic because its 33 I/O pins and 4 MHz deterministic RISC core reliably drive relays, solenoids, and contactor interfaces in motor starters and PLC subsystems. The 8-channel 8-bit ADC reads 4-20 mA transducer inputs directly, while the 16-bit timer with CCP generates precise PWM for proportional valve control. With -40C to +125C extended temperature rating, the part withstands factory-floor thermal cycling. The EPROM windowed package allows in-circuit firmware updates during commissioning without socket replacement, reducing field-service downtime.
Recommended
Motor Drive Interface Controller
In motor drive systems, the PIC16C65A-04E/L serves as the supervisory controller bridging low-level gate drivers and the host PLC. The 16-bit CCP module generates 10 kHz PWM with 10-bit resolution for current/torque loops, while the 8-bit ADC samples phase currents and DC-bus voltage for closed-loop regulation. The USART with SPI master mode connects to digital hall-effect sensors or isolated gate drivers, and 33 I/O pins handle brake, fault, and enable signals. The EPROM memory retains calibration constants across power cycles without battery, ideal for ruggedized industrial drives.
Recommended
Sensor Signal Conditioning Hub
The PIC16C65A-04E/L excels as a multi-sensor conditioning hub with its 8-channel 8-bit ADC reading thermocouples, RTDs, pressure transducers, and photo-detectors simultaneously. The PIC16C6X core runs linearization and cold-junction compensation algorithms at 4 MHz, while the USART streams filtered readings to a host controller at 115.2 kbps. Extended temperature operation (-40C to +125C) tolerates sensor mounting near heat sources. The EPROM windowed package enables post-assembly firmware customization per sensor calibration curve without re-sourcing masked-ROM parts.
Recommended
Legacy Embedded System Maintenance
The PIC16C65A-04E/L supports long-lifecycle legacy equipment where original EPROM-based MCUs are mandatory for form-fit-function replacement. Industrial control panels, medical instruments, and aerospace ground-support equipment designed in the 1990s still rely on this exact part for spare-part replacement. The windowed ceramic package accepts UV erasure for firmware revision updates during scheduled maintenance, and the 44-PLCC socket footprint is mechanically standardized across decades of Microchip PIC16C6X production. The extended-temperature rating ensures reliability in unconditioned enclosures.
Recommended
Keypad and LED Multiplex Display
The PIC16C65A-04E/L drives large 8x8 keypad/LED matrix displays through its 33 I/O pins organized across Ports B, C, D, and E. The PIC16C6X RISC core scans 64 keys with hardware-debounced inputs at 1 kHz refresh rates, while 16-bit timer interrupts maintain flicker-free LED PWM dimming. USART peripherals drive external shift-register chains for additional I/O expansion. The 4 MHz instruction cycle supports sub-millisecond response latency for tactile user feedback, critical in industrial HMI panels and instrumentation front panels.
Recommended
Automotive Aftermarket ECU
The PIC16C65A-04E/L fits automotive aftermarket ECU applications due to its -40C to +125C extended temperature rating and ruggedized EPROM memory that retains tuning maps across engine-bay thermal extremes. The 8-channel ADC reads MAP, MAF, O2, and TPS sensors simultaneously, while the 16-bit CCP module generates fuel-injection and idle-air-control PWM signals. The USART interfaces with OBD-II diagnostic tools for emissions tuning. The windowed ceramic package supports dyno-shop firmware flashing during custom calibration without part replacement, valuable for performance tuning shops.
Recommended
Communication Protocol Bridge
The PIC16C65A-04E/L operates as a serial protocol bridge between legacy RS-232 equipment and modern SPI/I2C peripherals. The USART hardware block handles asynchronous serial up to 115.2 kbps with hardware flow control, while the synchronous master mode generates SPI clocks for sensor peripherals or EEPROM storage. The 192-byte RAM buffers protocol packets, and the 7KB EPROM stores translation tables for non-standard industrial protocols. Extended temperature operation tolerates outdoor or cabinet-mounted installation in telecommunications and process-control installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65A-04E/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-04/L | PIC16F65-I/L | PIC16C65B-04E/L | PIC18F458-E/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Program Memory | 7 KB EPROM (OTP) | 7 KB EPROM | 7 KB Flash | 7 KB EPROM | 32 KB Flash |
| Memory Type | EPROM (UV-erasable) | EPROM | Flash | EPROM | Flash |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 1.5 KB |
| I/O Pins | 33 | 33 | 33 | 33 | 30 |
| Max Clock Speed | 10 MHz | 10 MHz | 20 MHz | 10 MHz | 40 MHz |
| Supply Voltage | 4.0V to 5.5V | 4.0V to 5.5V | 2.0V to 5.5V | 4.0V to 5.5V | 2.0V to 5.5V |
| ADC | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 10-bit |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +125C (Extended) |
Key Differentiators
- Windowed UV-erasable EPROM allows in-circuit firmware revision (vs PIC16F65-I/L)
- Extended temperature range matches automotive under-hood specs (vs PIC16C65A-04/L)
- Backward-compatible instruction set across PIC16C6X family (vs PIC18F458-E/L)
Design Notes
The PIC16C65A-04E/L requires a stable 5.0V +/-10% supply (4.0V to 5.5V) with bulk decoupling of 10 uF electrolytic and 0.1 uF ceramic placed within 1 cm of VDD pins (pins 11 and 40). The two VDD/VSS pin pairs should each be decoupled separately to suppress digital switching noise from coupling into the analog ADC reference. For battery-backed applications, note that EPROM programming requires a 12V to 14V VPP supply on the MCLR/VPP pin, which is incompatible with battery-only designs.
When migrating code from PIC16C65A-04E/L to PIC16F65, verify that interrupt-priority logic is correctly handled; PIC16F65 adds hardware interrupt priorities not present in the C family. Also confirm the ADC configuration registers - PIC16F65 expanded the ADC control bits for additional channel selection modes. Brown-out reset behavior differs: PIC16F65 includes software-configurable BOR while PIC16C65A requires external supervisory circuitry. Always recompile and re-validate timing-critical code after migration.
Route the oscillator traces (OSC1, OSCC2) on the top layer with ground guard traces and keep traces under 1 cm to minimize EMI susceptibility. Place the 33 I/O pin headers and connectors around the perimeter of the PCB to simplify cable routing. The 44-pin PLCC socket should be oriented with pin 1 indicator matching the PCB silkscreen. Maintain 50 uF clearance between analog Port A/E traces and switching digital signals to preserve 8-bit ADC accuracy.
Compliance Information
Compliance information not explicitly provided in the verified web data. Windowed ceramic packages historically contain lead; designers should verify RoHS/REACH status directly with Microchip for European Union applications. The Extended temperature grade is rated for automotive-like environments but is not formally AEC-Q100 qualified per the data provided.
