PIC16F77T-I/L - 8-Bit 20MHz 14KB Flash MCU | Microchip | 44-PLCC
MPN: PIC16F77T-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.99 | $9.99 |
| 10 | $9.45 | $94.50 |
| 100 | $8.55 | $855.00 |
| 500 | $7.75 | $3,875.00 |
| 1,000 | $6.95 | $6,950.00 |
PIC16F77T-I/L Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and configurable peripherals. Within the broader taxonomy, MCUs sit inside the category of microprocessors -> semiconductors -> integrated circuits. PIC16F-series parts are Microchip's mid-range 8-bit RISC architecture family, positioned above the baseline PIC16C5X/PIC12CXXX devices and below the enhanced PIC18F family, offering an optimized balance of instruction simplicity (35 instructions), on-chip FLASH program storage, and analog/digital peripherals.
Key features of the PIC16F77T-I/L include a 20 MHz maximum operating clock, 8 channels of 8-bit Analog-to-Digital conversion, two additional timing modules (CCP and USART), 8K x 14 word FLASH program memory, 368 bytes of RAM, an operating voltage range of 2.0V to 5.5V across the -40C to +85C industrial temperature range, and 33 I/O pins with high-current sink/source capability. The device supports in-circuit serial programming (ICSP) via two pins, allowing firmware updates after PCB assembly.
The PIC16F77T-I/L uses a Harvard RISC architecture with separate program and data buses, plus a 14-bit instruction word that improves code density over baseline 12-bit PIC devices. The on-chip ADC with 8 channels enables direct analog sensor interfacing without external components, while the integrated USART supports asynchronous and synchronous serial communication for legacy industrial protocols. The combination of FLASH memory, low power consumption, and integrated peripherals enables compact designs with reduced BOM count.
Typical applications include industrial control systems (sensor conditioning, motor drive control, process monitoring), automotive body electronics (interior lighting, instrument panels, HVAC controllers), home appliances (washing machines, microwave ovens, thermostats), data acquisition systems, and legacy embedded control upgrades replacing PIC16C7X designs. The PIC16F77 is fully instruction-set compatible with the PIC16F73/74/76 family, simplifying code migration.
When designing with this part, allocate the oscillator circuit (crystal or resonator on OSC1/OSC2) carefully - load capacitor values must match the crystal manufacturer's specification, typically 15-33 pF. For ADC accuracy, place AVss and AVdd (or Vdd/Vss when dedicated analog supply pins are unavailable) separately and use proper analog ground isolation techniques to avoid digital switching noise coupling into conversion results.
Drop-in alternatives for PIC16F77T-I/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 PIC16F77T-I/L (same form factor and footprint) — differing in Timers, Core Architecture, Operating Temperature, Package, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F77-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F77T-E/L
✅ Drop-In✓ In Stock
$8.25 / Unit
View Datasheet →PIC16F77T-I/PT
✅ Drop-In✓ In Stock
$6.25 / Unit
View Datasheet →PIC16F877A-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F777T-I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16F76T-E/SO
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC16F77T-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16F (8-bit RISC, 14-bit instruction word) |
| Program Memory Type | FLASH |
| Program Memory Size | 14 KB (8K x 14 words) |
| RAM Size | 368 bytes |
| Maximum Clock Frequency | 20 MHz |
| Instruction Execution Time | 200 ns |
| Operating Voltage Range | 2.0 V to 5.5 V |
| Number of I/O Pins | 33 |
| ADC Channels | 8 channels, 8-bit resolution |
| ADC Resolution | 8-bit |
| USART | Yes (1x, enhanced addressable) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Timers | Timer0, Timer1, Timer2 |
| Package Type | 44-pin PLCC (J-lead, with 'L' suffix) |
| Operating Temperature Range | -40C to +85C (Industrial, 'I') |
| Programming Method | ICSP (In-Circuit Serial Programming) |
| Mounting Type | Surface Mount (PLCC socket or SMT) |
| RoHS Status | Compliant |
| Instruction Set Size | 35 single-word instructions |
PIC16F77T-I/L Pin Configuration
| Pin 1 | MCLR/Vpp — Master Clear (Reset) input / Programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / ADC positive reference voltage |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI slave select |
| Pin 8 | RE0/RD — PORTE bit 0 / Read control for parallel slave port |
| Pin 9 | RE1/WR — PORTE bit 1 / Write control for parallel slave port |
| Pin 10 | RE2/CS — PORTE bit 2 / Chip select for parallel slave port |
| Pin 11 | VDD — Positive power supply (2.0V 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 input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 module |
| 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 / USART async transmit / USART sync clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART async receive / USART sync 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 power supply (2.0V to 5.5V) |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / LVP programming pin |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data input/output |
| Pin 41 | AVSS — Analog ground reference |
| Pin 42 | AVDD — Analog positive power supply |
| Pin 43 | NC — Not connected (per datasheet pinout) |
| Pin 44 | NC — Not connected (per datasheet pinout) |
Typical Applications
PIC16F77T-I/L is suitable for 6 applications: Industrial Control Systems, Home Appliance Control, Automotive Body Electronics, Data Acquisition Systems, HVAC Control Systems, Legacy PIC16C7X Replacement.
Industrial Control Systems
The PIC16F77T-I/L fits industrial control designs requiring sensor interfacing and digital control in harsh environments. Its 8 channels of 8-bit ADC directly digitize sensor signals from temperature, pressure, and flow transducers, while 33 I/O pins drive relays, solenoids, and indicator LEDs. The 20 MHz clock provides 5 MIPS processing for PID control loops at sub-millisecond update rates. The 2.0V to 5.5V operating range accommodates standard 24V industrial bus rails stepped down via switching regulators or 5V logic rails. The industrial -40C to +85C temperature rating ensures reliable operation in outdoor and factory-floor environments without active cooling. The 14 KB FLASH supports control firmware with multiple operational modes, fault handling, and communication stacks for Modbus RTU or proprietary serial interfaces. Recommended companion parts include the PIC16F877A-I/L (peripheral upgrade) and PIC16F77T-E/L (extended temperature grade for outdoor installations).
Recommended
Home Appliance Control
The PIC16F77T-I/L is well suited for home appliance control boards including washing machines, microwave ovens, dishwashers, and HVAC thermostats. Its 33 I/O pins drive 7-segment displays, keypad matrices, and triac-controlled heating elements while reading temperature sensors, water level switches, and door interlocks through the 8-channel ADC. The 14 KB FLASH stores appliance firmware including wash programs, safety interlocks, and error handling logic. The 2.0V to 5.5V Vdd range accommodates rectified mains-derived DC rails. The USART enables communication with display drivers and remote control receivers. Industrial temperature rating (-40C to +85C) handles the thermal stress of appliance environments. The ICSP feature supports factory calibration and post-assembly firmware updates. Companion parts include PIC16F76T-E/SO for compact designs with fewer I/O requirements and PIC16F77T-I/L as the primary control MCU for full-featured appliances.
Recommended
Automotive Body Electronics
The PIC16F77T-I/L serves body control applications such as seat controllers, interior lighting modules, instrument clusters, and HVAC control units. Its 33 I/O pins interface with switch panels, rotary encoders, and lamp drivers while the 8-bit ADC reads position sensors and battery voltage. The 8 channels of 8-bit ADC handle multiplexed analog inputs for ambient temperature, sunload sensors, and potentiometer inputs. The 20 MHz clock supports CAN-capable LIN bus emulation at standard automotive baud rates. The industrial -40C to +85C temperature rating covers most automotive cabin environments, though for underhood use the PIC16F77T-E/L extended-temperature grade is preferred. The 14 KB FLASH stores fault diagnostics and customer-specific calibration data. The 2.0V to 5.5V Vdd range handles automotive 12V battery cranking transients through voltage regulators. Companion parts include PIC16F77T-E/L for underhood applications and PIC16F877A-I/L for higher I/O requirements.
Recommended
Data Acquisition Systems
The PIC16F77T-I/L enables cost-effective multi-channel data acquisition for industrial monitoring, environmental logging, and test equipment. Its 8 channels of 8-bit ADC digitize analog sensor inputs at up to approximately 50 ksps aggregate throughput, while 368 bytes of RAM buffer acquisition frames for UART transmission. The 33 I/O pins control multiplexers, gain relays, and status indicators in front-end analog signal conditioning circuits. The USART provides async serial output for PC-based logging, while ICSP enables field recalibration and firmware updates. The 14 KB FLASH supports calibration constants and lookup tables for linearization of nonlinear transducers. The 20 MHz clock allows simultaneous sampling and serial transmission. Industrial -40C to +85C rating suits outdoor and laboratory environments. Companion parts include PIC16F77-I/L (tube packaging for prototyping) and PIC16F877A-I/L (upgrade path for higher-channel-count systems).
Recommended
HVAC Control Systems
The PIC16F77T-I/L supports HVAC control boards including residential thermostats, zone controllers, and commercial building automation panels. The 8-channel ADC reads thermistor temperature sensors, humidity transducers, and pressure sensors for environmental monitoring, while 33 I/O pins drive relay outputs for compressors, fan motors, and damper actuators. The 14 KB FLASH stores PID control algorithms, scheduling logic, and communication protocols for BACnet or Modbus integration. The USART supports isolated serial communication to building management systems. The 2.0V to 5.5V Vdd range accommodates 24VAC-derived DC rails typical in HVAC equipment. Industrial -40C to +85C rating handles unconditioned equipment rooms and rooftop installations. The 20 MHz clock supports real-time control loops for variable-speed fan control. Companion parts include PIC16F76T-E/SO for compact thermostat designs and PIC16F77T-E/L for outdoor installations requiring extended temperature grade.
Recommended
Legacy PIC16C7X Replacement
The PIC16F77T-I/L is the FLASH-based drop-in replacement for legacy PIC16C7X OTP (one-time programmable) designs requiring in-circuit reprogrammability. Its PIC16C7X instruction-set compatibility preserves existing firmware code, while FLASH program memory eliminates the OTP programming bottleneck for prototyping and small-batch manufacturing. The 14 KB FLASH accommodates C-language programs with libraries and stack usage, while 368 bytes RAM supports standard C variable allocation. The PIC16F77 is upwards compatible with the PIC16C5X, PIC12CXXX, and PIC16C7X device families per the Microchip datasheet. ICSP enables in-field firmware updates via two pins without removing the chip from the PCB. The 44-pin PLCC package provides identical form factor to legacy PIC16C7X PLCC versions for direct socket replacement. Companion parts include PIC16F77T-E/L for high-temperature replacements and PIC16F77-I/L for prototype evaluation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F77T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F77-I/L | PIC16F77T-E/L | PIC16F77T-I/PT | PIC16F877A-I/L | PIC16F777T-I/PT | PIC16F76T-E/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-lead) | 44-pin PLCC (J-lead) - same | 44-pin PLCC (J-lead) - same | 44-pin TQFP - different package | 44-pin PLCC (J-lead) - same | 44-pin TQFP - different package | 28-pin SOIC - different package |
| Program Memory | 14 KB FLASH (8K x 14) | 14 KB FLASH | 14 KB FLASH | 14 KB FLASH | 14 KB FLASH | 14 KB FLASH | 14 KB FLASH |
| RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 8 KB | 368 bytes |
| Max Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 22 |
| ADC Channels | 8 (8-bit) | 8 (8-bit) | 8 (8-bit) | 8 (8-bit) | 8 (10-bit) | 14 (10-bit) | 5 (8-bit) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Operating Voltage | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V |
| Packaging Format | Tape & Reel (T suffix) | Tube (no T suffix) | Tape & Reel | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
Key Differentiators
- Higher I/O count than 28-pin PIC16F76 family (vs PIC16F76T-E/SO)
- Drop-in upgrade path to PIC16F877A with enhanced peripherals (vs PIC16F877A-I/L)
- Tape-and-reel packaging for SMT assembly (vs PIC16F77-I/L)
Design Notes
The PIC16F77T-I/L requires a stable 2.0V to 5.5V supply on VDD pins (44-pin PLCC has two VDD pins: pin 11 and pin 32, plus AVDD on pin 42). Place a 100 nF decoupling capacitor on each VDD pin as close to the package as possible, plus a bulk 10 uF capacitor at the board supply entry point. Estimated: typical operating current is approximately 5-15 mA at 20 MHz depending on peripheral activity; at 4 MHz the supply current drops to approximately 1-3 mA. Brown-out reset should be enabled via configuration bits for industrial applications to prevent code execution from corrupted FLASH at marginal supply voltages.
Select the oscillator mode via configuration bits: XT for 4 MHz crystals, HS for 20 MHz high-speed crystals, or RC for low-cost resonator circuits. Place the crystal/resonator within 1 cm of OSC1 (pin 13) and OSC2 (pin 14) pins, with load capacitors (typically 15-33 pF for crystals, calculated per crystal manufacturer datasheet) connected to ground. For 20 MHz operation at full Vdd range, HS oscillator mode with a fundamental-mode crystal or ceramic resonator is required. Avoid routing digital signal traces near the oscillator circuit to minimize EMI coupling.
Common design pitfalls with the PIC16F77T-I/L include: (1) not enabling the watchdog timer in configuration, which can leave the system in undefined state on code lockup; (2) leaving unused I/O pins as analog inputs (high-impedance, floating) instead of configuring as digital outputs to minimize supply current and EMI; (3) forgetting the MCLR pull-up resistor (typically 10 kOhm to VDD) which is required for proper reset operation; (4) not configuring unused interrupt flags before enabling interrupts, causing immediate false interrupts on startup; (5) using the LVP (low-voltage programming) mode without a pull-up on RB3/PGM, causing unintended entry into programming mode. Estimate: typical IDD programming current is approximately 20 mA during FLASH write.
For PCB layout, separate the analog section (AVDD pin 42, AVSS pin 41, analog inputs on PORTA and PORTE) from noisy digital traces and switching power supply circuitry. Use a star-ground topology connecting AVSS and VSS at a single point near the MCU. Route ADC reference voltage (VREF+ on RA3, pin 5) with a wide trace and bypass with a 100 nF capacitor; do not use VDD as ADC reference for high-accuracy conversions. Place a ground pour on the top layer under the MCU package to provide thermal dissipation and a low-impedance return path for digital switching currents.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-40C to +85C) suitable for non-safety automotive body electronics and industrial applications; not AEC-Q100 qualified for safety-critical automotive. For automotive applications requiring AEC-Q100, contact Microchip for qualified part numbers.
