PIC16LC65A-04I/P - 8-Bit MCU, 7KB OTP, 4MHz, 40-PDIP | Microchip
MPN: PIC16LC65A-04I/P β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.1 | $7.10 |
| 10 | $6.45 | $64.50 |
| 100 | $5.8 | $580.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
PIC16LC65A-04I/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and programmable peripheral I/O. Within the broader hierarchy, MCUs sit under microcontrollers -> embedded processors -> semiconductors. The PIC16C family specifically refers to Microchip's OTP-programmed mid-range 8-bit cores that use a Harvard architecture with separate program and data buses, 14-bit wide instruction words, and a RISC-style instruction set of 35 single-word instructions - most executed in a single instruction cycle except program branches (two cycles). These architectural choices minimise external component count while delivering deterministic real-time response.
Key differentiating features include the Harvard bus architecture with 14-bit instructions, five 8-bit digital I/O ports, a synchronous serial port (SSP) supporting SPI and I2C, a USART, an 8-bit timer/counter with prescaler, dual analog comparators, capture/compare/PWM modules, and a programmable brown-out reset. The /I suffix denotes industrial temperature grade and the /P suffix denotes the PDIP-40 plastic DIP package, both confirmed by Microchip part-numbering conventions.
Typical applications include industrial control and automation, sensor interfacing, low-power embedded controllers, legacy peripheral replacement, and consumer white-goods logic where OTP programmability and the broad toolchain support of MPLAB IDE reduce time-to-market. The /I industrial temperature grade also suits factory-floor and outdoor enclosures not exposed to extended thermal excursions.
When designing with this device, ensure that the chosen 3V-5.5V LDO or switching regulator supplies clean rail voltage with adequate decoupling (typically 100 nF plus 10 uF bulk) near the VDD pins. For new designs prefer a flash-based PIC16F equivalent (same pinout, in-system programmable) unless OTP and one-time cost-per-unit optimisation are explicit requirements of the BOM. The OTP memory cannot be erased, so firmware revision requires a physical part replacement.
Drop-in alternatives for PIC16LC65A-04I/P 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 PIC16LC65A-04I/P (same form factor and footprint) β differing in Package, Timers, Mounting Type, ADC, Communication Interfaces.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65B-04I/P
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.75 / Unit
View Datasheet βPIC16F74-I/P
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PIC16LF74-I/P
β Drop-Inπ Reference alternative (not in catalog)
PIC16F874A-I/P
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16F74A-I/P
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC65A-04I/P Maximum Ratings & Electrical Characteristics
| Core | PIC16C 8-bit RISC |
| Program Memory | 7 KB (4K x 14) OTP |
| Data RAM | 192 bytes |
| Data EEPROM | Not present (OTP family) |
| Maximum Clock Speed | 4 MHz (04 speed grade) |
| Supply Voltage (VDD) | 3 V to 5.5 V |
| Digital I/O Pins | 33 |
| Timers | Timer0 8-bit, Timer1 16-bit, Timer2 8-bit |
| Analog Comparators | 2 |
| Communication Interfaces | USART, SSP (SPI / I2C) |
| Capture/Compare/PWM | Yes (CCP module) |
| Brown-out Reset | Yes (programmable) |
| Instruction Set | 35 single-word instructions, 14-bit wide |
| Operating Temperature | -40C to +85C (industrial, /I grade) |
| Package | 40-pin PDIP (Plastic DIP, 0.600 in) |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16LC65A-04I/P Pin Configuration
| Pin 1 | OSC1/CLKIN β Crystal oscillator input / external clock input |
| Pin 2 | OSC2/CLKOUT β Crystal oscillator output / clock output (Fosc/4) |
| Pin 3 | MCLR/VPP β Master clear reset input / programming voltage input |
| Pin 4 | RA0/AN0 β PORTA bit 0 / analog comparator input 0 |
| Pin 5 | RA1/AN1 β PORTA bit 1 / analog comparator input 1 |
| Pin 6 | RA2/AN2 β PORTA bit 2 / analog comparator input 2 |
| Pin 7 | RA3/AN3/VREF β PORTA bit 3 / analog input 3 / voltage reference |
| Pin 8 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/SS/AN4 β PORTA bit 5 / SPI slave select / analog input 4 |
| Pin 10 | RE0/RD/AN5 β PORTE bit 0 / parallel-port read control / analog input 5 |
| Pin 11 | RE1/WR/AN6 β PORTE bit 1 / parallel-port write control / analog input 6 |
| Pin 12 | RE2/CS/AN7 β PORTE bit 2 / parallel-port chip select / analog input 7 |
| Pin 13 | VSS β Ground reference |
| Pin 14 | VDD β Positive supply voltage (3V-5.5V) |
| Pin 15 | OSC1 β (dual oscillator pin reserved - see datasheet) |
| Pin 16 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 17 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Pin 18 | RC2/CCP1 β PORTC bit 2 / CCP1 PWM/capture/compare |
| Pin 19 | RC3/SCK/SCL β PORTC bit 3 / SPI clock / I2C clock |
| Pin 20 | RC4/SDI/SDA β PORTC bit 4 / SPI data in / I2C data |
| Pin 21 | RC5/SDO β PORTC bit 5 / SPI data out |
| Pin 22 | RC6/TX/CK β PORTC bit 6 / USART transmit / clock |
| Pin 23 | RC7/RX/DT β PORTC bit 7 / USART receive / data |
| Pin 24 | RB0/INT β PORTB bit 0 / external interrupt input |
| Pin 25 | RB1 β PORTB bit 1 |
| Pin 26 | RB2 β PORTB bit 2 |
| Pin 27 | RB3/PGM β PORTB bit 3 / low-voltage programming mode input |
| Pin 28 | RB4 β PORTB bit 4 |
| Pin 29 | RB5 β PORTB bit 5 |
| Pin 30 | RB6/PGC β PORTB bit 6 / in-circuit serial programming clock |
| Pin 31 | RB7/PGD β PORTB bit 7 / in-circuit serial programming data |
| Pin 32 | VSS β Ground reference (digital core) |
| Pin 33 | VDD β Positive supply (digital core) |
| Pin 34 | RD0/PSP0 β PORTD bit 0 / parallel slave port data bit 0 |
| Pin 35 | RD1/PSP1 β PORTD bit 1 / parallel slave port data bit 1 |
| Pin 36 | RD2/PSP2 β PORTD bit 2 / parallel slave port data bit 2 |
| Pin 37 | RD3/PSP3 β PORTD bit 3 / parallel slave port data bit 3 |
| Pin 38 | RD4/PSP4 β PORTD bit 4 / parallel slave port data bit 4 |
| Pin 39 | RD5/PSP5 β PORTD bit 5 / parallel slave port data bit 5 |
| Pin 40 | RD6/PSP6 β PORTD bit 6 / parallel slave port data bit 6 |
Typical Applications
PIC16LC65A-04I/P is suitable for 6 applications: Industrial Sensor Interface Controller, Low-Power Embedded Controller, Consumer Appliance Logic Board, Legacy Peripheral Replacement, Motor Speed and PWM Drive Controller, Communication Bridge (UART/SPI/I2C).
Industrial Sensor Interface Controller
The PIC16LC65A-04I/P fits sensor-interface front-ends because its 33 digital I/O pins can directly drive relay coils, optocouplers, and 4-20 mA loops while its 4 MHz core executes averaging and linearisation in real time. The wide 3V-5.5V range lets the same board accept either 5V sensor rails or 3.3V logic without a level shifter. The PIC's two analog comparators and the capture/compare/PWM module handle closed-loop motor or solenoid control.
Recommended
Low-Power Embedded Controller
The PIC16LC65A-04I/P is well suited to low-power embedded controllers because the LC suffix designates low-power CMOS cells that draw microamp-level sleep currents. With the on-chip brown-out reset and watchdog active, the part can wake from sleep, sample, and return to sleep on a duty cycle that runs for years from a single lithium cell. The 192-byte data RAM is sufficient for ring-buffer sensor logging without external memory.
Recommended
Consumer Appliance Logic Board
The PIC16LC65A-04I/P is a strong fit for fixed-function appliance logic, where the OTP memory is locked at production and the firmware never changes during the product's life. The 40-PDIP through-hole package survives thermal cycling in dishwashers, washing machines, and ovens. Five ports of 8-bit I/O drive the keypad scan, LED matrix, triac-trigger pulse trains via the PWM module, and the USART link to an inverter board.
Recommended
Legacy Peripheral Replacement
The PIC16LC65A-04I/P is often used as a form-fit replacement for end-of-life microcontrollers in legacy industrial cabinets, motor drives, and process controllers. The 40-PDIP footprint matches sockets originally designed for Intel 8051 family or Z8 parts, and the Harvard architecture plus RISC core deliver deterministic interrupt response that matches or improves on the legacy part. Designers can retain the original PCB while modernising firmware in C under MPLAB X.
Recommended
Motor Speed and PWM Drive Controller
The PIC16LC65A-04I/P drives brushed DC or stepper motors using its CCP/PWM module to generate precise duty cycles at the 4 MHz instruction cycle resolution. Five I/O ports each source/sink 20 mA, enough to drive bipolar transistor gates directly. The industrial -40C to +85C temperature grade supports cabinet-mounted motors and outdoor pump controls where ambient swings are routine.
Recommended
Communication Bridge (UART/SPI/I2C)
The PIC16LC65A-04I/P is well matched as a protocol bridge between field devices because it carries both a USART and a Synchronous Serial Port supporting SPI and I2C in hardware. Three independent serial channels let one chip route industrial RS-485 traffic to an I2C sensor while forwarding a SPI display channel to an HMI. The wide 3-5.5V range lets the bridge sit on either side of a level shifter.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65A-04I/P β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-04I/P | PIC16F74-I/P | PIC16LF74-I/P | PIC16F874A-I/P | PIC16F74A-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB Flash | 7 KB Flash | 7 KB Flash | 7 KB Flash |
| Max Clock Speed | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 4.5 V to 5.5 V | 2 V to 5.5 V | 4.5 V to 5.5 V | 2 V to 5.5 V |
| Memory Type | OTP (one-time programmable) | OTP | Flash (in-system programmable) | Flash (in-system programmable) | Flash (in-system programmable) | Flash (in-system programmable) |
| ADC Channels | 0 (analog comparators only) | 0 | 5 x 8-bit | 5 x 8-bit | 8 x 10-bit | 8 x 8-bit |
| Programming Method | High-voltage VPP (~13V) | High-voltage VPP | ICSP (low-voltage) | ICSP (low-voltage) | ICSP (low-voltage) | ICSP (low-voltage) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Param Match % | 100 (reference) | 95 | 80 | 90 | 80 | 80 |
Key Differentiators
- True 3V-5.5V wide-range supply on the LC OTP silicon (vs PIC16F74-I/P)
- Lower cost in high-volume frozen-firmware designs (vs PIC16F74-I/P)
- Industrial /I grade from -40C to +85C (vs PIC16C65A-04/P (commercial grade))
- 33 I/O pins with parallel slave port support (vs PIC16F74-I/P (33 I/O, no PSP))
Design Notes
Estimated: at maximum activity the PIC16LC65A-04I/P draws under 5 mA at 5V (about 25 mW). A 100 nF ceramic decoupling capacitor placed within 5 mm of VDD pins plus a bulk 10 uF electrolytic or tantalum on the same rail is the standard decoupling arrangement. The LC process supports brown-out reset thresholds down to about 3 V, so a 3.3V-only design should leave ample headroom.
Do not rely on ICSP (low-voltage programming) for the PIC16LC65A-04I/P - this device is OTP and requires high-voltage VPP (~13 V) on the MCLR/VPP pin during programming. Using a programmer set to ICSP mode will not detect the device. Use PRO MATE, PM3, PICSTART Plus, or a third-party gang programmer with the OTP device profile selected.
Route the crystal traces for OSC1/OSC2 within a guard ring tied to ground, keeping them away from switching traces and from RA ports that may toggle as outputs. The 40-PDIP package gives 2.54 mm pin pitch and through-hole pads, so pour a single stitched ground plane on the top layer for clean return paths. Place decoupling within one pin-pitch of VDD and VSS.
MCLR must rise monotonically - add a 10 kohm pull-up to VDD and a 100 nF cap to ground to filter transients. Watchdog and brown-out reset should be enabled in the configuration bits for safety-critical applications. The PORTA analog-capable pins default to analog mode on reset; configure the CMCON and ADCON1/ANSEL registers before reading them as digital inputs.
Compliance Information
RoHS and lead-free status confirmed via the Microchip product page (per distributor listings as of 2026-09-22). AEC-Q100 automotive qualification is not applicable for industrial-grade /I parts; refer to the PIC16LC65A-04I/PT automotive variant for AEC-Q100 requirements.
