PIC16LC65B-04/P - 8-bit PIC MCU 7KB EPROM 4MHz | Microchip
MPN: PIC16LC65B-04/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.85 | $68.50 |
| 100 | $6.1 | $610.00 |
| 500 | $5.45 | $2,725.00 |
| 1,000 | $4.9 | $4,900.00 |
PIC16LC65B-04/P Overview
An 8-bit PIC microcontroller is a Harvard-architecture RISC processor optimized for embedded systems where deterministic instruction timing, low power consumption, and small code footprint are essential. The PIC16C/LC family uses a 14-bit instruction word and offers 35 single-word instructions, with all instructions executing in one instruction cycle except for program branches which take two cycles. This hierarchy places the PIC16LC65B within the broader categories of microcontroller -> embedded processor -> semiconductor IC.
Key features include 7KB EPROM program memory (one-time programmable), 192 bytes of data RAM, 33 digital I/O pins, hardware USART, parallel slave port, two analog comparators, watchdog timer with on-chip RC oscillator, and power-on reset circuitry. The device operates across a commercial temperature range of 0C to +70C and supports in-circuit serial programming (ICSP) via dedicated RB6/RB7 pins.
Architecture-wise, the PIC16LC65B uses an enhanced mid-range 14-bit core with separate program and data address spaces, enabling faster context switching and reduced interrupt latency. The EPROM program memory allows one-time field programming via standard EPROM programmers, while the LC variant's 3V-5.5V operating range makes it suitable for both 3.3V and 5V designs.
Typical applications include industrial control systems, motor control peripherals, sensor interface modules, automotive body electronics (non-safety), consumer appliance controllers, and legacy embedded system maintenance. The 40-pin PDIP package simplifies prototyping and breadboarding. When designing with this device, note that the EPROM windowed ceramic variant requires UV erasure for reprogramming, while the standard OTP plastic variant cannot be erased. Modern designs should consider the PIC16F877A flash equivalent for new development.
Drop-in alternatives for PIC16LC65B-04/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 PIC16LC65B-04/P (same form factor and footprint) — differing in Instruction Set, Package, Program Memory Size, Program Memory Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65B-04/P
✅ Drop-In✓ In Stock
$6.72 / Unit
View Datasheet →PIC16F877A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F874A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F874-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC65B-04/P Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC RISC (14-bit instruction word) |
| Program Memory Type | EPROM (One-Time Programmable) |
| Program Memory Size | 7 KB |
| Data RAM | 192 bytes |
| Clock Speed (Maximum) | 4 MHz (at 3V to 5.5V) |
| Supply Voltage Range | 3 V to 5.5 V |
| I/O Pins | 33 |
| Timers | 2x 8-bit + 1x 16-bit |
| Communication | USART (SCI) |
| Parallel Slave Port (PSP) | Yes (Port D) |
| Analog Comparators | 2 |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| In-Circuit Serial Programming (ICSP) | Yes |
| Package | 40-pin PDIP (DIP-40) |
| Mounting Type | Through-Hole |
| Operating Temperature Range | 0C to +70C (Commercial) |
| Instruction Set | 35 single-word instructions |
PIC16LC65B-04/P Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage input |
| 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 (open-drain) / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / PSP read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / PSP write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / PSP chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage (+3V to +5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator crystal output / Clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 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/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (+3V to +5.5V) |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / Low-voltage programming enable |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data input/output |
Typical Applications
PIC16LC65B-04/P is suitable for 6 applications: Industrial Control Systems, Motor Control Peripherals, Sensor Interface Modules, Consumer Appliance Controllers, Legacy Embedded System Maintenance, Hobbyist and Educational Prototyping.
Industrial Control Systems
The PIC16LC65B-04/P fits legacy industrial control applications requiring reliable 8-bit processing at 3V to 5.5V with 33 digital I/O for sensor interfacing and actuator driving. Its USART enables connection to industrial communication buses, while the Parallel Slave Port on PORTD allows direct interfacing with external controllers or memory-mapped peripherals. The 4MHz clock is sufficient for closed-loop control loops in motor speed regulation, valve positioning, and conveyor sequencing. Drop-in replacement for older designs still running production lines.
Recommended
Motor Control Peripherals
The PIC16LC65B-04/P's two 8-bit and one 16-bit timer/counter modules suit stepper motor and DC motor control applications where precise pulse-width modulation timing is required. The 33 I/O pins can drive H-bridge motor drivers directly via PWM outputs on PORTC, while the USART provides feedback communication to a master controller. The 3V-5.5V operating range accommodates both low-voltage battery motor systems and standard 5V industrial motor control boards. Legacy maintenance for existing PWM driver designs.
Recommended
Sensor Interface Modules
The PIC16LC65B-04/P serves sensor interface hubs requiring multiple digital inputs and moderate processing power. With 33 I/O lines, the device can read arrays of temperature, pressure, and flow sensors while driving indicator LEDs and relay outputs. The two analog comparators support threshold-based sensor detection without external components. Its 192-byte RAM accommodates small data buffers for sensor averaging algorithms, and the USART streams processed data to upstream data loggers or displays.
Recommended
Consumer Appliance Controllers
The PIC16LC65B-04/P integrates well into consumer appliance controllers such as washing machines, microwave ovens, and dishwasher control boards where 8-bit processing suffices for timing and I/O management. Its 33 I/O lines drive keypad scanning, LED/LCD displays, relay controls, and buzzer outputs. The 4MHz clock supports timing-critical operations like turntable rotation control, while the EPROM memory holds fixed appliance firmware in production units. The 0C to +70C commercial temperature range suits indoor appliance environments.
Recommended
Legacy Embedded System Maintenance
The PIC16LC65B-04/P is specifically targeted at maintaining legacy embedded systems originally designed around the PIC16C6X/LC65B family. Production facilities with installed equipment running OTP EPROM firmware can use this part for replacement boards and field service. Its pin-compatible 40-pin PDIP footprint allows direct board-level swap without PCB rework. For systems requiring firmware updates, the PIC16F877A-I/P offers a flash-based drop-in alternative, but for true legacy compatibility the LC65B remains the authentic original part.
Recommended
Hobbyist and Educational Prototyping
The PIC16LC65B-04/P in 40-pin PDIP package is well-suited to hobbyist prototyping and microcontroller education due to its breadboard-friendly through-hole form factor. Students can hand-solder the chip and access all 33 I/O lines plus the USART and PSP for interfacing experiments. The 7KB EPROM and 192B RAM teach fundamental embedded constraints like memory budgeting. Programming via ICSP on RB6/RB7 pins requires only a low-cost PIC programmer. Migration to PIC16F877A-I/P is straightforward for flash-reprogrammable lab work.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65B-04/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-04/P | PIC16F877A-I/P | PIC16F877-I/P | PIC16F874A-I/P | PIC16F874-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same |
| Program Memory Type | EPROM | EPROM | Flash | Flash | Flash | Flash |
| Program Memory Size | 7 KB | 7 KB | 14 KB | 14 KB | 7 KB | 7 KB |
| Data RAM | 192 bytes | 192 bytes | 368 bytes | 368 bytes | 128 bytes | 128 bytes |
| Maximum Clock Speed | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage Range | 3 V to 5.5 V | 4.5 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Reprogrammable | No (OTP EPROM) | No (OTP EPROM) | Yes (Flash, 100k cycles) | Yes (Flash, 100k cycles) | Yes (Flash, 100k cycles) | Yes (Flash, 100k cycles) |
Key Differentiators
- Low-voltage 3V operation in original PIC16C6X family footprint (vs PIC16C65B-04/P)
- Authentic legacy EPROM compatibility for installed base maintenance (vs PIC16F877A-I/P)
- Exact same I/O count and peripheral set with proven toolchain support (vs PIC16F874A-I/P)
Design Notes
Do not confuse the PIC16LC65B-04/P with the PIC16C65B-04/P: the LC variant operates from 3V to 5.5V while the C variant requires 4.5V to 5.5V. Substituting the C variant in a 3.3V design will cause brown-out reset issues. The "-04" suffix denotes 4MHz maximum clock speed; the -20 variant is required for applications needing 20MHz operation. Both LC and C variants use EPROM which cannot be electrically erased - any code change requires a new chip.
Place a 0.1uF decoupling capacitor as close as possible to each VDD pin (pins 11 and 32) with a short trace to the adjacent VSS pin (pins 12 and 31). For designs using the LC variant's 3.3V operation, ensure the bulk supply has sufficient headroom and low ripple; the brown-out detector triggers below approximately 3V. Adding a 10uF tantalum bulk capacitor near the MCU improves transient response when driving multiple outputs simultaneously.
Route the MCLR/VPP pin (pin 1) directly to the reset circuit with a 10k pull-up resistor to VDD. For ICSP programming, ensure the RB6/PGC and RB7/PGD lines are accessible via a programming header and are not loaded with heavy capacitance (>50pF). The OSC1/OSC2 traces (pins 13/14) should be kept short and surrounded by ground plane when using a crystal; for high-frequency or noisy environments, consider a 4-pin resonator with built-in capacitors.
Compliance Information
Compliance information not explicitly stated in the verified web data. The PIC16LC65B-04/P is a mature legacy part introduced in the 1990s; lead-free and RoHS status should be verified with Microchip directly for current production. Not AEC-Q100 qualified - this is a commercial-grade part.
