PIC16C77T-20I/PT - 8-Bit 20MHz OTP MCU 14KB Flash 44-TQFP | Microchip
MPN: PIC16C77T-20I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.2 | $132.00 |
| 100 | $11.8 | $1,180.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.1 | $9,100.00 |
PIC16C77T-20I/PT Overview
A PIC microcontroller is a Harvard-architecture RISC device from Microchip's PIC family, widely used as embedded controllers in industrial, automotive, and consumer products. PIC16C-series devices belong to the mid-range PIC family that bridges 8-bit simplicity with rich peripheral integration, making them suitable for applications requiring ADC, PWM, USART, and I/O control without the cost of a 16-bit MCU. The OTP variant (C-series) is programmed once during production and is ideal for high-volume mature products.
Key features include 8-level hardware stack, 14-bit wide instruction word, 35 instructions, 200ns instruction cycle at 20MHz, integrated 8-channel 8-bit ADC, two 8-bit timers plus one 16-bit timer, synchronous/asynchronous USART with 9-bit address detect, capture/compare/PWM module, and Brown-out Reset (BOR). The 44-TQFP package supports surface-mount assembly with standard 0.80mm lead pitch and exposes 33 general-purpose I/O plus dedicated oscillator, MCLR, and power pins.
Typical applications include industrial automation control, motor control, sensor interfacing, automotive body electronics, HVAC systems, security panels, and white-goods consumer appliances. The OTP memory makes it best suited for mature, high-volume designs where firmware is finalized and firmware updates are not expected in the field; for in-field updateable applications, the Flash-based PIC16F77 (pin-compatible migration path) is preferred.
When designing with this part, ensure decoupling capacitors (0.1uF ceramic) are placed close to VDD/AVDD/VSS pins and that the MCLR pin is pulled high through a resistor for normal operation. The PIC16C77 is a legacy OTP part - confirm supply-chain availability before starting new designs; the Flash-based PIC16F877 is the recommended modern alternative for new product development.
Drop-in alternatives for PIC16C77T-20I/PT — 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 PIC16C77T-20I/PT (same form factor and footprint) — differing in ADC, Package, Program Memory Type, Capture/Compare/PWM, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C77T-20/L
✅ Drop-In✓ In Stock
$9.45 / Unit
View Datasheet →PIC16C77-20I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-20I/P
✅ Drop-In✓ In Stock
$8.65 / Unit
View Datasheet →PIC16C77-20I/L
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC16F77-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77T-20I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC16C 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 14KB (8K x 14) |
| RAM Size | 368 bytes |
| EEPROM Size | None (OTP variant) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns @ 20 MHz |
| Number of I/O Pins | 33 |
| Supply Voltage Range | 4 V to 6 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 44-pin TQFP (10x10 mm), 0.80 mm pitch |
| Mounting Type | Surface Mount |
| Timers | 2 x 8-bit, 1 x 16-bit (TMR0/TMR1/TMR2) |
| ADC | 8 channels, 8-bit resolution |
| Communication Interfaces | USART (SCI), SPI, I2C (MSSP) |
| Capture/Compare/PWM | 1 x CCP module |
| Operating Temperature Grade | Industrial (I) |
| RoHS Status | Non-Compliant (legacy OTP, contains Pb) |
PIC16C77T-20I/PT 44-pin tqfp (10x10 mm), 0.80 mm pitch Pin Configuration Guide
Pin configuration for PIC16C77T-20I/PT (44-pin tqfp (10x10 mm), 0.80 mm pitch package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC16C77T-20I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16C77T-20I/PT is suitable for 5 applications: Industrial Automation Control, Motor Control and PWM Drives, Automotive Body Electronics, Consumer White Goods and Appliances, Sensor Interfacing and Data Acquisition.
Industrial Automation Control
The PIC16C77T-20I/PT's 33 I/O pins and 8-channel 8-bit ADC make it well suited for industrial control PLCs, sensor aggregation, and discrete actuator driving. Its 20MHz RISC core delivers 5 MIPS, enough to handle PID loops at 100Hz update rates; the OTP memory locks production firmware permanently, which suits mature industrial equipment that does not require field updates. The 4-6V supply is compatible with 5V industrial backplanes, and the -40C to +85C industrial temperature grade handles factory-floor environments. Pair with ULN2003 line drivers for high-current relay/solenoid control.
Recommended
Motor Control and PWM Drives
The PIC16C77T-20I/PT's Capture/Compare/PWM module and 16-bit TMR1 enable precise PWM generation for DC motor speed control, stepper drives, and small BLDC commutation. With one CCP channel and 8-bit PWM resolution at 20MHz, the device produces control signals up to 78kHz PWM frequency, suitable for brushless fans, servo amplifiers, and low-power pump controllers. The 33 I/O can simultaneously sense rotor position (Hall sensors), drive MOSFET gates, and monitor current via the ADC, enabling sensorless or sensored commutation in a single chip.
Recommended
Automotive Body Electronics
The PIC16C77T-20I/PT is qualified for the industrial -40C to +85C range (I-grade) and is widely deployed in automotive body modules such as HVAC blend-door actuators, mirror controllers, seat-position memory, and lighting controllers. The 5V supply and 8-bit ADC read potentiometers for position feedback; the USART links to a body-control network; the OTP memory locks the production calibration. For under-hood or engine-compartment applications where temperatures exceed 85C, migrate to PIC16C77T-20E/PT (extended -40C to +125C grade) in the same 44-TQFP footprint.
Recommended
Consumer White Goods and Appliances
The PIC16C77T-20I/PT is a proven workhorse in washing machines, dishwashers, microwave ovens, and refrigerator control boards. Its 33 I/O handle keypad scanning, 7-segment or LCD user interfaces, buzzer control, and triac-fired heater/valve drivers. OTP memory keeps per-model firmware locked, preventing accidental reprogramming in the field. The Brown-Out Reset (BOR) ensures clean MCU restart after brownout events typical of inductive compressor switching; industrial temperature grade covers kitchen environments.
Recommended
Sensor Interfacing and Data Acquisition
The PIC16C77T-20I/PT's 8-channel 8-bit ADC, multiple timers, and 33 I/O are well matched to multi-sensor acquisition panels in HVAC, environmental monitoring, and test fixtures. Sequential ADC sampling at 20MHz captures thermistor, pressure, humidity, and flow sensors with adequate throughput for trend logging into the 368-byte RAM. USART streams data to a host PC; the OTP firmware implements linearization tables, alarm thresholds, and Modbus framing. Industrial temperature range supports outdoor and equipment-room deployment.
