PIC16C77T-04I/L - 8-Bit 4MHz MCU, 14KB OTP, 44-PLCC | Microchip
MPN: PIC16C77T-04I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $6.01 | $3,005.00 |
| 1,000 | $5.39 | $5,390.00 |
PIC16C77T-04I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that executes instructions on 8-bit data words, typically used in embedded control applications requiring deterministic timing, low power consumption, and simple peripheral integration. Within the broader semiconductor taxonomy, MCUs sit under microcontrollers, then integrated circuits, then semiconductors. The PIC16C7X family specifically occupies the mid-range tier of Microchip's 8-bit portfolio, sitting between baseline (PIC10/12/16) and enhanced mid-range (PIC17) families, and is characterized by integrated analog-to-digital converters and on-chip EEPROM/OTP program memory.
Key features of the PIC16C77T-04I/L include an industrial operating temperature range (-40C to +85C per the I suffix), 14KB of OTP program memory for one-time field programming, three serial communication peripherals (UART/USART, SPI, I2C) for multi-device bus interfacing, and a 44-pin PLCC package with J-leads for socketed or surface-mount production. The 'T' suffix indicates Tape & Reel packaging, and the '04' speed grade denotes a 4 MHz maximum oscillator frequency. The /L suffix denotes the PLCC package variant.
Architecturally, the PIC16C77T-04I/L employs a Harvard RISC architecture with separate program and data buses, a 14-bit instruction word, and a single accumulator-based working register (W) architecture. This design delivers deterministic instruction timing - most instructions execute in one oscillator cycle - which simplifies real-time control loop design. The device operates from a 4.0V to 5.5V single supply, drawing low quiescent current suitable for industrial and consumer embedded products.
Typical applications include industrial control and automation, sensor interfacing, motor control front-ends, building automation, white goods control boards, and legacy embedded products originally designed around the PIC16C7X family. The wide I/O count and triple serial interface make it suitable for hub-style designs that aggregate multiple sensor inputs and forward data to a host controller.
When designing with this device, plan for OTP memory programming early in the production flow - unlike flash-based PIC16F variants, code cannot be erased or rewritten once programmed. Use the UART/USART, SPI, and I2C peripherals to offload communication tasks from software loops and reserve timer resources for PWM and capture/compare functions where deterministic timing matters most.
This page synthesizes distributor pricing, drop-in alternative part numbers, and practical design considerations that are not found in the manufacturer datasheet alone, helping engineers and procurement specialists evaluate the PIC16C77T-04I/L for new designs or production replenishment.
Drop-in alternatives for PIC16C77T-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 PIC16C77T-04I/L (same form factor and footprint) — differing in Core Architecture, Mounting Type, Package, Program Memory Type, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C77-04I/L
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16C77-04/L
✅ Drop-In✓ In Stock
$5.98 / Unit
View Datasheet →PIC16C77T-04E/L
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →PIC16C77-10I/PQ
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →PIC16C77-04/PT
✅ Drop-In✓ In Stock
$6.08 / Unit
View Datasheet →PIC16C74B-04E/L
✅ Drop-In✓ In Stock
$9.3 / Unit
View Datasheet →PIC16C77T-04I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16C mid-range RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14) |
| Data RAM | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Word Width | 14 bits |
| I/O Pins | 33 |
| Supply Voltage Range | 4.0 V to 5.5 V |
| Operating Temperature Range | -40C to +85C (industrial grade, I suffix) |
| Package Type | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm) |
| Mounting Type | Surface Mount (PLCC socket compatible) |
| Communication Interfaces | UART/USART, SPI, I2C |
| Speed Grade | 04 (4 MHz) |
| Packaging Format | Tape & Reel (T suffix) |
| RoHS Status | Compliant per Microchip product page |
PIC16C77T-04I/L Pin Configuration
| Pin 1 | NC — Not connected / reserved |
| 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 reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI 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 (4.0V to 5.5V) |
| 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 |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| 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 / UART TX / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / UART RX / 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 (4.0V to 5.5V) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / LVP programming |
| 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 / reserved |
| Pin 42 | NC — Not connected / reserved |
| Pin 43 | NC — Not connected / reserved |
| Pin 44 | MCLR/VPP — Master clear reset / programming voltage |
Typical Applications
PIC16C77T-04I/L is suitable for 7 applications: Industrial Process Control, White Goods and Appliance Control, Building Automation and HVAC, Sensor Interface Modules, Automotive Body Electronics (non-safety), Consumer Electronics Legacy Products, Motor Control Front-End.
Industrial Process Control
The PIC16C77T-04I/L fits industrial process control because its 4 MHz core and Harvard RISC architecture deliver deterministic single-cycle instruction execution for real-time PID loops monitoring temperature, pressure, and flow. Its 368 bytes of RAM and 14KB OTP program memory handle multi-sensor acquisition, threshold checking, and alarm generation without external memory. The 33 GPIO pins easily drive 4-20 mA loops, relay outputs, and keypads/LEDs. The industrial -40C to +85C temperature grade and 44-pin PLCC package suit factory-floor enclosures and through-hole assembly. The triple serial interface (UART/SPI/I2C) connects to PLC backplanes, sensor hubs, and HMI displays over Modbus or proprietary protocols.
Recommended
White Goods and Appliance Control
The PIC16C77T-04I/L is well suited to washing machines, dishwashers, ovens, and HVAC controllers because its 4 MHz core, 368 bytes of RAM, and 14KB OTP deliver enough headroom for multi-mode state machines, sensor fusion, and motor drive sequencing. The UART/USART and SPI peripherals interface directly to display modules, encoder wheels, and triac-based load drivers. The industrial temperature grade and rugged 44-pin PLCC package survive vibration, humidity, and thermal cycling inside appliance chassis. OTP memory provides tamper-resistance for safety-critical firmware, preventing field modification of certified control algorithms. Three timers support PWM outputs for motor speed control and zero-cross detection for AC load switching.
Recommended
Building Automation and HVAC
The PIC16C77T-04I/L serves building automation hubs where its 33 GPIO pins aggregate multiple sensor inputs (temperature, humidity, occupancy, CO2) and drive relay-controlled HVAC dampers, fans, and lighting. The 4 MHz core runs scheduling logic and Modbus RTU over the UART/USART, while I2C connects to digital temperature sensors and EEPROM storage. The 4.0V to 5.5V supply range aligns with industrial 5V bus power. Industrial -40C to +85C operation covers unconditioned mechanical rooms and rooftop installations. The 44-pin PLCC socket-compatible package simplifies field service - technicians can swap a programmed chip without desoldering.
Recommended
Sensor Interface Modules
The PIC16C77T-04I/L provides an economical bridge between analog sensors and digital hosts by exploiting its 8-channel 8-bit on-chip ADC, three serial interfaces, and 33 GPIO pins. At 4 MHz the device samples, averages, and forwards sensor data over SPI to a host processor while the UART handles configuration commands. The 368 bytes of RAM buffer raw conversion data without overflow. Industrial temperature operation and the rugged 44-pin PLCC package suit remote sensor stations in factories, agricultural greenhouses, and outdoor weather stations. OTP program memory secures proprietary calibration routines.
Recommended
Automotive Body Electronics (non-safety)
The PIC16C77T-04I/L fits non-safety automotive body electronics such as interior lighting controllers, seat position memories, and accessory timers where the 33 GPIO pins drive multiple LED strings, motors, and switch inputs. The UART interface links to body control modules over LIN-bus transceivers. The industrial -40C to +85C temperature grade handles cabin environments; for under-hood use, choose the PIC16C77T-04E/L extended-temperature variant. The 14KB OTP memory secures vehicle-specific calibration data. Note: For safety-critical automotive applications, select AEC-Q100 qualified PIC18 or dsPIC alternatives rather than the legacy OTP PIC16C family.
Recommended
Consumer Electronics Legacy Products
The PIC16C77T-04I/L keeps legacy consumer products in production - remote-controlled toys, audio mixers, programmable thermostats, and educational kits - where the original design used PIC16C7X silicon and cannot be migrated without firmware rework. Its 14KB OTP, 368 bytes RAM, and triple serial interface handle user-interface scanning, display driving, and IR remote decoding. The 44-pin PLCC socket mount simplifies field replacement. Industrial temperature grade supports outdoor products like garden irrigation controllers. The PIC16C7X architecture is mature and well-documented, simplifying long-term maintenance for products with 10+ year production cycles.
Recommended
Motor Control Front-End
The PIC16C77T-04I/L serves as a motor control front-end where the PIC core generates PWM signals, samples current via the on-chip ADC, and forwards telemetry over UART/SPI to a higher-level controller. Its 33 GPIO pins drive H-bridge enable lines, brake resistors, and tachometer inputs. The 4 MHz core runs trapezoidal or simple sinusoidal commutation tables for BLDC or stepper motors up to moderate RPM. The industrial temperature range and 44-pin PLCC package suit motor housings. OTP memory locks proprietary acceleration/deceleration profiles. For higher-performance field-oriented control, consider PIC18 or dsPIC30 parts with hardware PWM and 10-bit ADC.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77T-04I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C77-04I/L | PIC16C77-04/L | PIC16C77T-04E/L | PIC16C77-10I/PQ | PIC16C74B-04E/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-MQFP - DIFFERENT footprint | 44-PLCC - same |
| Core Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 10 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 (estimated, same family) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +125C (extended) |
| Supply Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V |
| Communication Interfaces | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C |
Key Differentiators
- Industrial temperature grade as standard for the I suffix variant (vs PIC16C77-04/L)
- Extended temperature option available within same package family (vs PIC16C77T-04E/L)
- Mature 8-bit PIC16C7X ecosystem with extensive documentation (vs PIC16F877A-I/P (flash alternative))
- Tape & Reel packaging optimized for high-volume SMT lines (vs PIC16C77-04/L (tube packaging))
Design Notes
PIC16C77T-04I/L uses OTP (One-Time Programmable) memory that cannot be erased or rewritten after programming. Production firmware must be fully validated and version-locked before OTP programming - unlike flash-based PIC16F variants, there is no recovery from a bad code image. Plan for verification on a PIC16F877A equivalent before committing to OTP programming, and use Microchip's ICSP interface (RB6/RB7 pins) with proper MCLR/VPP sequencing to avoid programming voltage conflicts.
PIC16C77T-04I/L is specified for -40C to +85C industrial operation, but the 44-pin PLCC package has limited thermal dissipation compared to surface-mount packages. At sustained 4 MHz operation with all peripherals active, internal power dissipation is typically below 50 mW - within the PLCC thermal envelope. For enclosed industrial cabinets with no airflow, verify junction temperature rise using theta_JA of approximately 50 C/W for the PLCC-44 package on a standard 4-layer test board. No heatsink is required for typical embedded control duty cycles.
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pin pair (pins 11/12 and pins 31/32 on the 44-PLCC). Add a single 10 uF bulk capacitor near the MCU power pins to handle oscillator inrush current. The PIC16C7X is sensitive to supply ripple during ADC conversions - keep analog VDD separate from digital VDD if the design permits, or use a ferrite bead for noise isolation. Place the oscillator crystal within 10 mm of OSC1/OSC2 pins and guard the traces with a ground ring to suppress EMI.
The 44-pin PLCC footprint uses J-leads on 1.27 mm pitch - the recommended PCB land pattern requires extended pads beyond the package outline to accommodate the J-lead bend. For socket-mount applications (PLCC sockets are widely available and simplify field service), allocate vertical clearance of at least 8 mm above the PCB. Reserve the MCLR pin (pin 44) for reset generation - connect to VDD through a 10 kohm pull-up with a 100 nF cap to ground for noise immunity, or drive it from a dedicated supervisor IC for industrial noise environments.
The PIC16C7X ADC achieves specified accuracy only with proper analog reference decoupling - place a 100 nF ceramic capacitor directly on the VREF/RA3 pin and a 10 uF tantalum bulk capacitor near the AVdd supply if your design splits analog and digital VDD. Avoid routing high-frequency digital signals (SPI clock, oscillator) adjacent to analog input pins RA0-RA5. Enable the ADC only during conversion windows to reduce digital switching noise injection into the analog domain. According to the Microchip PIC16C7X datasheet, the ADC requires a minimum acquisition time governed by the analog source impedance - use source impedances below 10 kohm for full 8-bit accuracy.
Compliance Information
RoHS compliance per Microchip product page. PIC16C77T-04I/L is NOT AEC-Q100 qualified - for automotive applications requiring AEC-Q100, choose PIC18 or dsPIC AEC-Q100 qualified variants. Halogen-free status not specified in the verified web data.
