PIC16LC77-04/L - 8-bit 4MHz 14KB OTP MCU 44-PLCC | Microchip
MPN: PIC16LC77-04/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.57 | $10.57 |
| 10 | $9.62 | $96.20 |
| 100 | $8.1 | $810.00 |
| 500 | $7.05 | $3,525.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16LC77-04/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals onto a single silicon die. The PIC architecture uses a Harvard structure with separate program and data buses, which allows instruction words to differ in width from the 8-bit data word and improves instruction throughput compared with von Neumann designs. Within Microchip's portfolio, the PIC16C family sits between the baseline PIC10/12/16 and the high-performance PIC17/PIC18 series, targeting cost-sensitive industrial and consumer applications that need A/D conversion and moderate I/O counts.
The PIC16LC77-04/L integrates an 8-channel 8-bit A/D converter, USART, SPI/I2C-compatible synchronous serial port, capture/compare/PWM modules, and a watchdog timer. The "LC" suffix indicates the low-voltage CMOS process, enabling operation down to 2.5 V for battery-powered designs, while the "-04" speed grade denotes the 4 MHz oscillator limit. With 368 bytes of RAM and an instruction set optimized for single-word single-cycle execution, the part delivers deterministic interrupt response suitable for real-time control loops.
Architecturally, the device uses a 14-bit wide program memory word with 35 instructions, allowing most operations to complete in a single instruction cycle (4 oscillator clocks). This RISC-style design yields an instruction throughput of 1 MIPS at 4 MHz, balanced against the 14 KB code ceiling for mid-sized firmware projects. The OTP memory means firmware is programmed during manufacturing and cannot be updated in the field.
Typical applications include industrial motor control, automotive body electronics, appliance control boards, smart sensors, and low-power instrumentation. The wide operating voltage and rich peripheral mix also suit battery-backed data loggers and legacy equipment retrofits.
When designing with this OTP part, plan code space carefully because firmware cannot be re-programmed in the field. Use the Microchip MPLAB ICD or PRO MATE device programmer during development and reserve adequate decoupling (0.1 uF plus bulk) near the VDD pins.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes that complement the Microchip datasheet.
Drop-in alternatives for PIC16LC77-04/L — 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 PIC16LC77-04/L (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Mounting Type, Timers, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC77-04I/L
✅ Drop-In✓ In Stock
$5.15 / Unit
View Datasheet →PIC16F877A-I/LG
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC16C77-04/PQ
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →PIC16LC74A-04/PQ
✅ Drop-In✓ In Stock
$2.43 / Unit
View Datasheet →PIC16LC77-04/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit Harvard RISC |
| Series | PIC16C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14 words) |
| RAM Size | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Throughput | 1 MIPS @ 4 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| A/D Converter | 8 channels x 8-bit |
| Package | 44-PLCC (J-Lead), 16.59 x 16.59 mm |
| Mounting Type | Surface Mount |
| Timers | Timer0, Timer1, Timer2 with PWM |
| Communication Interfaces | USART, SPI, I2C (SSP) |
| Watchdog Timer | Yes |
PIC16LC77-04/L Pin Configuration
| Pin 1 | MCLR — Master Clear reset input (active low) |
| Pin 2 | OSC1 — Oscillator input / external clock input |
| Pin 3 | OSC2 — Oscillator output / clock out |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / VREF+ |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3/PGM — PORTB bit 3 / Low-voltage programming |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 20 | VSS — Ground |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock |
| Pin 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 24 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/Capture/Compare) |
| Pin 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 40 | VSS — Ground |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
Typical Applications
PIC16LC77-04/L is suitable for 6 applications: Industrial Motor Control, Automotive Body Electronics, Home Appliance Control Boards, Battery-Powered Sensor Hubs, Legacy Equipment Retrofits, HVAC Control Systems.
Industrial Motor Control
The PIC16LC77-04/L fits industrial motor control boards because its 33 I/O pins and 8-channel 8-bit A/D converter provide ample PWM channels and current/voltage sensing inputs needed for BLDC and stepper control loops. The 4 MHz / 1 MIPS throughput delivers deterministic interrupt response for commutation timing, while the 2.5-6.0 V supply range accepts 24 V industrial rails after regulation. Place the 44-PLCC part on a socketed carrier for field service, and add 0.1 uF + bulk decoupling at each VDD pair per the Microchip datasheet typical application circuit.
Recommended
Automotive Body Electronics
In automotive body modules (window controllers, seat adjusters, mirror controls), the PIC16LC77-04/L provides the 33 I/O count needed for relay drivers and switch matrix scanning while running from a regulated 5 V supply tapped off the 12 V bus. The 8-bit A/D reads potentiometer positions for motor feedback, and the USART/SPI peripherals interface with body-control network ICs. Pair with the industrial-grade PIC16LC77-04I/L variant for under-hood temperature swings, and add TVS protection on inputs per automotive EMC best practices.
Recommended
Home Appliance Control Boards
Washing machines, dishwashers, and microwave ovens benefit from the PIC16LC77-04/L's 33 I/O pins for keypad scanning, seven-segment or LCD drive, sensor inputs, and triac-fired load control. The 14 KB OTP memory holds appliance state machines and timing routines, while the 8-channel A/D reads temperature, water level, and humidity sensors. The OTP memory suits high-volume consumer appliances where firmware lock prevents unauthorized modification, and the 44-PLCC package supports automated pick-and-place assembly on control boards.
Recommended
Battery-Powered Sensor Hubs
The PIC16LC77-04/L's low-voltage CMOS core supports operation down to 2.5 V, making it suitable for battery-powered sensor hubs that aggregate analog inputs and forward them via SPI to a radio module. Sleep current plus USART wakeup support multi-year battery life on 2xAA cells, while the 14 KB OTP memory holds sensor calibration tables and protocol stacks. Use the A/D converter's low-power modes between samples, and pair with a low-Iq LDO such as MCP1700 for sub-microamp quiescent operation during sleep.
Recommended
Legacy Equipment Retrofits
The PIC16LC77-04/L serves as a drop-in replacement for legacy PIC16C7X designs that need end-of-life refresh without PCB rework. Because the 44-PLCC pinout is shared across the PIC16C7X family, retrofitters can swap aging parts for new inventory while preserving firmware originally compiled for the same core. Industrial equipment with installed bases of PLCC sockets benefits from this longevity, and the OTP memory maintains bit-for-bit firmware compatibility with the original part.
Recommended
HVAC Control Systems
Heating, ventilation, and air-conditioning (HVAC) controllers use the PIC16LC77-04/L to drive triac outputs for fan speeds, read thermistor inputs through the 8-channel A/D, and communicate with indoor/outdoor unit networks via USART. The 33 I/O pins handle multiple relay banks and keypads, while the OTP memory stores zone calibration constants. Industrial temperature grade via the -04I/L variant supports unconditioned mechanical rooms, and the 2.5-6.0 V supply range accepts common 5 V and 3.3 V HVAC bus voltages.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC77-04/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC77-04I/L | PIC16F877A-I/L | PIC16C77-04/P | PIC16LC74A-04/PQ |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 40-PDIP - different | 44-MQFP - different |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB Flash | 14 KB OTP | 7 KB OTP |
| RAM Size | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.0 V to 5.5 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| A/D Converter | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 10-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| Memory Type | OTP | OTP | Flash | OTP | OTP |
| Temperature Grade | Standard | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Standard | Standard |
Key Differentiators
- Industry-standard PIC16C7X core with extensive Microchip toolchain support (vs PIC16F877A-I/L)
- Industrial temperature grade variant available in identical package (vs PIC16LC77-04I/L)
- 44-PLCC J-Lead package supports socketed field replacement (vs PIC16C77-04/P (40-PDIP))
Design Notes
Estimated: at VDD = 5 V and active-mode current of approximately 2 mA at 4 MHz, the PIC16LC77-04/L consumes roughly 10 mW. Add 0.1 uF ceramic decoupling close to each VDD pin pair (pins 11/21/31/41 share VDD; pins 10/20/30/40 share VSS) plus a single 10 uF bulk capacitor at the regulator output. Use a low-dropout regulator such as MCP1700 (250 mA, 1.6 uA quiescent) when operating from a 5 V or higher rail to keep sleep currents low for battery applications.
Because the program memory is OTP (one-time programmable), firmware bugs cannot be patched after programming - a misprogrammed part is scrap. Use the windowed UV-erasable CERDIP variant (PIC16C77-04/JW) or the flash-based PIC16F877A-I/L for development, then commit to OTP only after firmware is fully validated. Also note that the PIC16C77 has no on-chip debug; rely on MPLAB SIM and ICE hardware during firmware bring-up.
Place a 4.7 kohm pull-up on MCLR (pin 1) and configure the device for internal RC or external crystal oscillator mode per the datasheet. For 44-PLCC layout, use a PLCC socket (e.g., AMP 1-822516-1) to allow field replacement, and keep the oscillator traces short and guarded with a ground ring to reduce EMI susceptibility in industrial environments. Add a series 100 ohm resistor on MCLR if the device is exposed to ESD transients.
Compliance Information
Compliance data not present in the verified web sources. Microchip Technology legacy PIC16C OTP parts were often available in both leaded and lead-free finishes; verify RoHS/lead-free status by lot with the distributor before procurement for RoHS-restricted markets.
