PIC16C77-04I/L - 8-Bit 4MHz OTP MCU 14KB | Microchip
MPN: PIC16C77-04I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.62 | $762.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC16C77-04I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, working RAM, I/O peripherals, and timers on one die. Within the PIC taxonomy, the PIC16C family belongs to the mid-range RISC architecture and is upwards-compatible with the earlier PIC16C5X baseline devices, forming part of Microchip's broader microcontroller portfolio that scales from 6-pin PIC10F parts up to 100-pin PIC18F devices.
Key features of the PIC16C77-04I/L include a Harvard RISC CPU executing 35 single-word instructions in a single 200 ns instruction cycle (branches take two cycles), an industrial -40C to +85C operating range, a wide 2.5 V to 6.0 V supply voltage range, and 25 mA source/sink current per I/O pin for direct LED or transistor drive. Capture/Compare/PWM, USART, and synchronous serial port peripherals are included for motor control and communications.
Architecturally, the device uses a 14-bit instruction word with separate program and data buses, allowing simultaneous instruction fetch and data access. On-chip RC oscillator, watchdog timer, brown-out reset, and power-on reset improve system robustness in industrial environments with noisy supplies. The A/D converter has 8 input channels multiplexed onto a single successive-approximation ADC, suitable for sensor arrays.
Typical applications include industrial process control, motor drive, instrumentation, HVAC controls, automotive body electronics, and embedded data acquisition. The PIC16C77's combination of ADC, PWM, and USART peripherals makes it well suited to closed-loop feedback systems where multiple sensor inputs must be sampled and actuator outputs driven in real time.
A key design consideration is that the PIC16C77 uses OTP EPROM, so code cannot be re-programmed in-circuit; designers should plan for the PIC16F877A or PIC16F77 flash-based counterpart when code revisions are anticipated during development or field updates.
This page consolidates distributor pricing, pin-compatible drop-in alternatives, and practical design notes drawn from the Microchip datasheet family to support sourcing and redesign decisions.
Drop-in alternatives for PIC16C77-04I/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 PIC16C77-04I/L (same form factor and footprint) — differing in Operating Temperature, Serial Interfaces, Package, ADC, Capture/Compare/PWM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C77-04/L
✅ Drop-In✓ In Stock
$5.98 / Unit
View Datasheet →PIC16C77-04E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-04E/PT
✅ Drop-In✓ In Stock
$10.45 / Unit
View Datasheet →PIC16C77-04/PT
✅ Drop-In✓ In Stock
$6.08 / Unit
View Datasheet →PIC16F77-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877A-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-04I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC mid-range |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 14 KB (8K x 14 words) |
| RAM Size | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Instruction Set | 35 single-word instructions |
| Supply Voltage Range | 4.0 V to 5.5 V (extended to 6.0 V) |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit resolution |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM | Yes (CCP module) |
| USART | Yes (1x) |
| SSP (I2C/SPI) | Yes (Synchronous Serial Port) |
| I/O Source/Sink Current | 25 mA / 25 mA |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
PIC16C77-04I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| 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 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SSP Slave Select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator 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 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SSP clock (SPI/I2C) |
| Pin 19 | RC4/SDI/SDA — PORTC bit 4 / SSP data in / I2C data |
| Pin 20 | RC5/SDO — PORTC bit 5 / SSP data out |
| Pin 21 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 22 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 23 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 24 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 25 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 26 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 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 |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3 — PORTB bit 3 |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C77-04I/L is suitable for 6 applications: Industrial Process Control, Motor Drive and PWM Control, HVAC Climate Control Systems, Instrumentation and Data Acquisition, Automotive Body Electronics, Embedded Sensor Interface Boards.
Industrial Process Control
The PIC16C77-04I/L fits industrial process control because it combines an 8-channel 8-bit ADC with three timers, a USART, and 25 mA I/O drive in a single 44-pin PLCC. The 4 MIPS core executes 200 ns single-cycle instructions, sufficient for PID loops at 1 kHz update rates on multiple sensor inputs. The wide 4.0-5.5 V supply range tolerates 24 V industrial rails stepped down to logic levels, while the -40C to +85C industrial temperature rating survives factory-floor environments. Brown-out reset and watchdog timer harden the design against supply glitches common near motor drives and relay panels.
Recommended
Motor Drive and PWM Control
The PIC16C77-04I/L is well suited to brushed DC and stepper motor control because its Capture/Compare/PWM module generates hardware PWM without CPU overhead, freeing the 4 MIPS core for commutation logic and current sensing. The 8-channel ADC samples shunt resistors or Hall-effect sensors in real time, while 25 mA I/O source/sink directly drives opto-isolators or small gate-driver ICs. The USART accepts encoder feedback or commands from a host controller. PIC16C77's 14 KB OTP holds complex trapezoidal profiles, while the 44-pin PLCC's thermal performance supports continuous PWM at high duty cycles.
Recommended
HVAC Climate Control Systems
The PIC16C77-04I/L drives HVAC controllers by reading multiple temperature sensors through its 8-channel ADC, switching triacs for blower and compressor stages, and communicating with thermostats over the USART. Its 33 I/O lines accommodate zone valves, damper actuators, and indicator LEDs without external expanders. The -40C to +85C industrial rating handles unconditioned plant rooms, and brown-out reset survives compressor inrush events. The 14 KB OTP memory stores lookup tables for non-linear thermistor linearization and adaptive compressor curves.
Recommended
Instrumentation and Data Acquisition
The PIC16C77-04I/L serves low-channel-count data acquisition where its 8-channel 8-bit ADC, 368-byte RAM buffer, and USART combine to log and forward sensor readings. The 4 MHz clock delivers 1 MIPS, sufficient for 1 kHz aggregate sampling across multiplexed analog inputs. SSP (SPI) port accepts high-speed ADC front-ends or external memory for buffer expansion. The industrial temperature grade and 4.0-5.5 V supply tolerate battery-backed instrumentation racks. OTP memory locks calibration constants, preventing field tampering in metrology deployments.
Recommended
Automotive Body Electronics
The PIC16C77-04I/L is widely deployed in body controllers (window lifts, seat controls, lighting) thanks to its 33 robust I/O lines with 25 mA drive, automotive-grade EMI tolerance, and CAN-ready USART peripherals. Its 4 MIPS performance handles multiplexed body-bus traffic and PWM dimming simultaneously. The -40C to +85C industrial temperature rating meets most cabin-electronics specifications. Note that for under-hood powertrain applications, designers should migrate to AEC-Q100-qualified PIC18F devices, as the PIC16C77 is not automotive-qualified per Microchip product family documentation.
Recommended
Embedded Sensor Interface Boards
The PIC16C77-04I/L is ideal for sensor interface boards that aggregate analog signals from multiple transducers and forward processed data to a host. Its 8-channel ADC, I2C/SPI via SSP, and USART support mixed sensor interfaces on a single chip. The 368-byte RAM serves as a local data buffer before USART transmission. 25 mA I/O drives relay coils or indicator LEDs directly. Industrial -40C to +85C rating suits outdoor sensor enclosures, and OTP code-lock protects proprietary calibration algorithms from reverse engineering in deployed units.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77-04I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C77-04/L | PIC16C77-04E/L | PIC16F77-I/L | PIC16F877A-I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC | 44-pin PLCC | 44-pin PLCC | 44-pin PLCC | 44-pin PLCC |
| Program Memory Type | 14 KB OTP EPROM | 14 KB OTP EPROM | 14 KB OTP EPROM | 14 KB Flash | 14 KB Flash |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| RAM Size | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| ADC | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit | 8-ch 10-bit |
| Operating Temperature | -40C to +85C | 0C to +70C | -40C to +125C | -40C to +85C | -40C to +85C |
| USART | 1 | 1 | 1 | 1 | 2 |
| EEPROM | None | None | None | None | 256 bytes |
| Pin Count | 44 | 44 | 44 | 44 | 44 |
Key Differentiators
- Lower per-unit cost in volume due to OTP memory vs flash equivalents (vs PIC16F877A-I/L)
- Industrial temperature grade matches factory-floor deployment (vs PIC16C77-04/L)
- Single-chip integration of 8-channel ADC + PWM + USART + SSP (vs PIC16C77-04E/L)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/AVDD pin pair (pins 11-12 and 31-32), with a bulk 10 uF tantalum or aluminum polymer capacitor on the supply rail within 1 inch. The PIC16C77-04I/L datasheet specifies 4.0-5.5 V operation; for noise-sensitive ADC applications, power the AVREF pin from a separate filtered regulator or ferrite bead to prevent digital switching noise from coupling into analog measurements. Brown-out reset must be enabled (BOREN configuration bit) for industrial environments with unstable supplies.
The 44-pin PLCC package has a 1.27 mm pitch and a thermal pad - use 4-layer PCB with continuous ground plane for best EMI performance. Keep crystal traces within 0.25 inches of OSC1/OSC2 pins, with a grounded guard ring around the oscillator area to prevent capacitive coupling into adjacent analog inputs. Route analog input traces (AN0-AN7) away from digital switching signals, and place the ADC reference bypass capacitor directly at the VREF+/VREF- pins if external reference is used.
OTP programming cannot be reversed: a single programming error permanently bricks the PIC16C77-04I/L. Always verify code in a flash-based PIC16F77 or PIC16F877A emulator before committing to OTP production units. Note that pins 41-44 are NC (not connected); do not route signals to these pins as they have no internal bond-wire connection. The MCLR pin requires a 10 kohm pull-up to VDD for normal operation - leaving it floating causes intermittent resets.
The PIC16C77-04I/L USART does not include internal slew-rate limiting; for long RS-485 cable runs above 1 MHz, add external termination resistors and consider the MAX485 transceiver for robust industrial communications. The SSP (I2C) peripheral requires 4.7 kohm pull-up resistors on SDA/SCL even at 100 kHz - lower values (2.2 kohm) are needed for 400 kHz Fast-Mode operation. The ADC's 8-bit resolution is sensitive to source impedance above 10 kohm; add an op-amp buffer for high-impedance sensors.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F family for automotive. Halogen-free status not stated in verified web data.
