PIC16C77T-20I/L - 8-Bit 20MHz 14KB OTP MCU 44-PLCC | Microchip
MPN: PIC16C77T-20I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.8 | $9.80 |
| 10 | $8.92 | $89.20 |
| 100 | $7.85 | $785.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16C77T-20I/L Overview
An OTP microcontroller is a flash-like non-volatile memory device that can be programmed exactly once after manufacture; unlike UV-erasable EPROM, the windowed CERDIP variant, OTP cannot be erased and re-programmed, which lowers per-unit cost for high-volume production while still providing deterministic in-system program retention. The PIC16C77T-20I/L sits inside the broader PIC16CXX mid-range family (PIC16CXX -> PIC16 mid-range -> 8-bit MCU -> microcontroller -> embedded IC), positioning it as a legacy industrial-grade controller for cost-sensitive embedded designs.
Key features include 33 digital I/O lines, an integrated 8-channel 8-bit A/D converter, and three serial communication peripherals: I2C (Inter-Integrated Circuit, also known as IIC), SPI (Serial Peripheral Interface), and UART/USART (Universal Asynchronous/Synchronous Receiver-Transmitter). Two 8-bit timers and one 16-bit timer/counter support PWM generation and event timing, while 256 bytes of EEPROM data memory retain configuration and calibration values across power cycles. The device runs from a 4.0 V to 5.5 V single supply and is specified across the -40C to +85C industrial temperature range (I suffix).
Architecturally, the PIC16C77T-20I/L uses a Harvard architecture with separate program and data buses, a single accumulator (W register) working model, and a 14-bit instruction word optimized for compact code density. Its 20 MHz oscillator delivers a 200 ns instruction cycle, and the integrated A/D converter uses successive-approximation conversion with analog input multiplexing across eight channels, suitable for slow-changing sensor signals.
Typical applications include industrial process control, motor drive interface logic, instrumentation data acquisition, automotive body electronics (non-safety), HVAC control boards, and consumer appliance controllers. Its combination of OTP memory, broad peripheral set, and industrial temperature range makes it well-suited for high-volume embedded products where code stability is required over the product lifecycle.
A primary design consideration with this device is the OTP memory - firmware must be fully verified before programming, because no field re-programmability is possible. Engineers targeting in-field firmware updates should select a Flash-based PIC16F7X equivalent (such as PIC16F877A-I/L) with the same 44-pin PLCC footprint.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical engineering guidance not consolidated on any single distributor or manufacturer page, providing a one-stop engineering reference for the PIC16C77T-20I/L.
Drop-in alternatives for PIC16C77T-20I/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 PIC16C77T-20I/L (same form factor and footprint) — differing in Program Memory Type, Core Architecture, Timers, Program Memory Size, ADC.
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/L
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC16C77T-04E/L
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →PIC16C77T-10/L
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC16C77T-10E/L
✅ Drop-In✓ In Stock
$11.94 / Unit
View Datasheet →PIC16C77-04I/L
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16C77T-20I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16C mid-range, Harvard |
| Instruction Set | RISC, 35 instructions, 14-bit word |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| RAM | 368 bytes |
| EEPROM Data Memory | 256 bytes |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| I/O Pins | 33 digital I/O |
| A/D Converter | 8 channels, 8-bit resolution |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | I2C, SPI, UART/USART |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Operating Temperature | -40C to +85C (Industrial, I suffix) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
PIC16C77T-20I/L 44-pin plcc (16.59 x 16.59 mm) Pin Configuration Guide
Pin configuration for PIC16C77T-20I/L (44-pin plcc (16.59 x 16.59 mm) 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/L.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16C77T-20I/L is suitable for 6 applications: Industrial Process Control, Motor Drive Interface Logic, Instrumentation Data Acquisition, Automotive Body Electronics (Non-Safety), HVAC Control Boards, Consumer Appliance Controllers.
Industrial Process Control
The PIC16C77T-20I/L fits industrial process control boards because of its 8-channel 8-bit A/D converter, 33 digital I/O pins, and 20 MHz CPU clock at -40C to +85C. The A/D reads thermocouple, pressure transducer, and 4-20 mA loop signals with multiplexing across 8 channels; the 14 KB OTP EPROM holds the deterministic PID control loop and HMI menu code. The UART/USART links to operator panels and SCADA, while SPI connects to digital potentiometers for trim. Industrial temp and surface-mount PLCC make it suited to factory-floor controllers, conveyor sorters, and tank-level monitors where OTP cost-down and 5 V supply rails are industry-standard.
Recommended
Motor Drive Interface Logic
For motor-drive interface logic on stepper and small BLDC controllers, the PIC16C77T-20I/L's three timers (2x 8-bit + 1x 16-bit with capture/compare) generate the PWM commutation and pulse-count feedback, while the 33 I/O pins drive H-bridge enable lines and Hall-sensor inputs. The 20 MHz instruction cycle executes 5 MIPS, sufficient to handle 20 kHz PWM switching plus the UART command interface for speed setpoint commands. The 256-byte EEPROM stores motor calibration parameters across power cycles. The 5 V supply aligns with industrial driver ICs, and the 44-PLCC footprint fits the legacy form factor used in many motor-control modules.
Recommended
Instrumentation Data Acquisition
In instrumentation data acquisition, the PIC16C77T-20I/L's 8-channel 8-bit A/D converter digitizes analog sensor channels at up to ~20 kS/s aggregate, while 368 bytes of RAM buffer conversion results and 14 KB of OTP code runs the averaging, scaling, and display logic. The I2C peripheral reads external EEPROM calibration tables; the SPI bus drives an LCD controller or digital potentiometer; and the UART streams formatted readings to a host PC. The industrial -40C to +85C range suits bench-top and rack-mounted instruments in lab and factory environments. OTP ensures code stability for calibrated products that must not drift over the instrument lifecycle.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety automotive body electronics - window lifts, mirror controls, lighting drivers - the PIC16C77T-20I/L provides the I/O count, 5 V operation, and -40C to +85C industrial temperature range that match cabin-electronics environments. Its 33 digital I/O pins drive relays and read switch matrix inputs; the A/D reads potentiometer positions for seat adjustment; the UART links to body-control modules; and the I2C bus reads digital temperature sensors. OTP EPROM is acceptable for high-volume body modules with finalized firmware, and the 44-PLCC package supports through-hole-style wave soldering on legacy automotive PCB assemblies.
Recommended
HVAC Control Boards
HVAC control boards leverage the PIC16C77T-20I/L's 8-channel A/D for thermistor temperature sensing, its timers for triac zero-crossing phase-angle dimming of fan speeds, and its 33 I/O pins for relay coils driving compressors and dampers. The I2C peripheral reads digital humidity sensors, while the UART connects to wall thermostats and building management gateways. Industrial -40C to +85C operation covers equipment-room and rooftop-unit environments, and 5 V supply aligns with HVAC driver rails. The OTP EPROM delivers BOM-cost reduction for high-volume residential HVAC controls where firmware is finalized at production release.
Recommended
Consumer Appliance Controllers
Consumer appliance controllers (washing machines, dishwashers, microwave ovens, small kitchen appliances) rely on the PIC16C77T-20I/L's I/O count for keypad scanning, seven-segment or LCD display driving, and motor/valve actuation. The A/D reads water-level, temperature, and humidity sensors, while the timers generate buzzer tones and PWM for variable-speed drives. The UART/USART links to diagnostic ports for service. The 14 KB OTP EPROM holds the deterministic state machine for cycle control - acceptable for closed appliance designs - and the 44-PLCC through-hole-compatible footprint suits high-volume wave-soldered appliance PCBs where per-unit cost matters most.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77T-20I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C77T-20/L | PIC16C77-20I/L | PIC16C77T-04E/L | PIC16C77T-10/L | PIC16C77T-10E/L | PIC16C77-04I/L |
|---|---|---|---|---|---|---|---|
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 10 MHz | 10 MHz | 4 MHz |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| A/D Converter | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit |
| Packaging Format | Tape & Reel (T suffix) | Tube | Tube | Tape & Reel | Tube | Tape & Reel | Tube |
Key Differentiators
- Tape-and-reel packaging for high-volume SMT assembly (vs PIC16C77T-20/L)
- 20 MHz maximum clock - highest speed in the family (vs PIC16C77T-04E/L)
- Industrial -40C to +85C temperature range (vs PIC16C77T-10/L)
- PIC16C7X family with mature toolchain and reference designs (vs PIC16F877A-I/L)
Design Notes
The OTP (One-Time Programmable) EPROM cannot be erased after programming. Verify firmware with the PIC16C77 windowed CERDIP variant (PIC16C77-20/JW) before committing to the OTP part for production. A single bit error in production programming requires scrapping the device; plan for pre-production programming validation.
The PIC16C77T-20I/L requires a stable 4.0 V to 5.5 V supply with decoupling: place a 100 nF ceramic capacitor directly across VDD/VSS pins adjacent to the IC, plus a 10 uF bulk capacitor on the board-level 5 V rail. Brown-out detection is configurable via configuration fuses - enable it for industrial applications to prevent code execution at unsafe supply voltages below 4.0 V.
Place the 20 MHz crystal or resonator within 10 mm of the OSC1/OSC2 pins to minimize parasitic capacitance and ensure stable oscillation. Keep digital switching traces (especially PWM outputs and clock signals) away from the analog AVdd/A Vss pins and the A/D converter input traces. Use a ground plane under the device with a single-point connection between digital and analog ground returns near the AVDD pin.
For in-circuit serial programming (ICSP), allocate the RB6 (PGC) and RB7 (PGD) pins to dedicated test points or a 2x3 header rather than shared signal lines. The MCLR pin requires a 10 kohm pull-up to VDD for normal operation, plus a diode and current-limiting resistor for the in-circuit programming voltage. Sharing MCLR with a reset supervisor IC is possible but requires careful RC timing to avoid contention.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not stated in the Verified Web Data; marked [DATA_NEEDED] in specs. AEC-Q100 not qualified - this is an industrial-temp (I suffix) part, not automotive-grade.
