PIC16F77T-E/PT - 8-Bit 20MHz 14KB Flash MCU TQFP-44 | Microchip
MPN: PIC16F77T-E/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
PIC16F77T-E/PT Overview
An 8-bit PIC microcontroller is a Harvard-architecture RISC processor widely used in embedded control applications; it executes one instruction per cycle (except branches) and integrates Flash program memory, RAM, peripherals (ADC, comparators, timers, USART, PWM, etc.), and a brown-out reset into a single IC. Positioned in the broader hierarchy, PIC16 MCUs sit above PIC10/PIC12 baseline parts and below PIC18/PIC24 enhanced parts, and within Microchip's lineup they serve cost-sensitive real-time control tasks where deterministic interrupt latency and mature toolchain support are valued.
Key features of the PIC16F77T-E/PT include five 8-bit I/O ports providing up to 33 digital I/O pins, a 10-bit multi-channel ADC, two analog comparators, three timers (Timer0, Timer1, Timer2), a USART with 9-bit address detection, capture/compare/PWM modules, and an internal watchdog timer. The device also supports in-circuit serial programming (ICSP) for field updates.
Architecture-wise, the PIC16F77 uses a 14-bit instruction word and 35 single-word instructions, enabling a 200 ns instruction cycle at 20 MHz. Internal RC oscillator options reduce external component count, while the enhanced CCP module simplifies motor-control and SMPS designs. The brown-out reset and power-on reset circuitry improve robustness in industrial environments.
Typical applications include industrial automation controllers, motor control subsystems (BLDC, stepper, relay drive), digital signal conditioning, consumer appliance control panels, HVAC and thermostat front-ends, sensor signal preprocessing, and automotive interior accessories (non-safety). It is also a common drop-in choice for upgrading legacy PIC16C/PIC16F designs that need additional code space.
When designing with this part, allocate the oscillator and MCLR circuitry per datasheet recommendations and verify ADC acquisition time against source impedance. Programming via ICSP requires a 4-pin header with proper isolation to avoid loading the signals during debug.
This page consolidates distributor pricing, drop-in alternatives in the same TQFP-44 footprint, and design notes that complement - but do not replace - the manufacturer datasheet.
Drop-in alternatives for PIC16F77T-E/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 PIC16F77T-E/PT (same form factor and footprint) — differing in Package, Timers, I/O Pins, Core Architecture, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F77T-E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$8.25 / Unit
View Datasheet →PIC16F777T-I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16F777-E/PT
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16F777-I/ML
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.48 / Unit
View Datasheet →PIC16F77-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F77T-E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 8-bit RISC (Harvard) |
| Instruction Word Size | 14-bit |
| Program Memory (Flash) | 14 KB (8K x 14) |
| RAM | 368 bytes |
| Clock Speed (max) | 20 MHz |
| Instruction Cycle | 200 ns at 20 MHz |
| Supply Voltage | 4.0 V to 5.5 V |
| I/O Pins | 33 (5 ports) |
| ADC | 10-bit, multi-channel |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Analog Comparators | 2 |
| Communication | USART (with 9-bit address detect) |
| PWM / CCP | Yes (Capture/Compare/PWM) |
| Watchdog Timer | Yes (internal) |
| Brown-out Reset | Yes |
| Operating Temperature (E suffix) | -40C to +125C (industrial) |
| Package | TQFP-44 (10x10 mm, also called PT) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Programming | ICSP (In-Circuit Serial Programming) |
PIC16F77T-E/PT Pin Configuration
| Pin 1 | OSC1/CLKI — Crystal oscillator input or external clock input |
| Pin 2 | OSC2/CLKO — Crystal oscillator output or clock output |
| Pin 3 | MCLR/VPP — Master Clear (reset) input or programming voltage |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / Voltage reference |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI slave select |
| Pin 10 | RE0/RD/AN5 — PORTE bit 0 / Parallel port read / Analog input 5 |
| Pin 11 | RE1/WR/AN6 — PORTE bit 1 / Parallel port write / Analog input 6 |
| Pin 12 | RE2/CS/AN7 — PORTE bit 2 / Parallel port chip select / Analog input 7 |
| Pin 13 | VSS — Ground reference |
| Pin 14 | VDD — Positive supply voltage 4.0V-5.5V |
| Pin 15 | OSC1 — Secondary oscillator pin (alternate) |
| Pin 16 | OSC2 — Secondary oscillator pin (alternate) |
| Pin 17 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 18 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 19 | RC2/CCP1 — PORTC bit 2 / CCP1 module |
| Pin 20 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 21 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 22 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 23 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 24 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 25 | RB0/INT — PORTB bit 0 / external interrupt input |
| Pin 26 | RB1 — PORTB bit 1 |
| Pin 27 | RB2 — PORTB bit 2 |
| Pin 28 | RB3/PGM — PORTB bit 3 / low-voltage programming enable |
| Pin 29 | RB4 — PORTB bit 4 / interrupt-on-change |
| Pin 30 | RB5 — PORTB bit 5 / interrupt-on-change |
| Pin 31 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 32 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 33 | RD0 — PORTD bit 0 / parallel data bus |
| Pin 34 | RD1 — PORTD bit 1 / parallel data bus |
| Pin 35 | RD2 — PORTD bit 2 / parallel data bus |
| Pin 36 | RD3 — PORTD bit 3 / parallel data bus |
| Pin 37 | RD4 — PORTD bit 4 / parallel data bus |
| Pin 38 | RD5 — PORTD bit 5 / parallel data bus |
| Pin 39 | RD6 — PORTD bit 6 / parallel data bus |
| Pin 40 | RD7/PSP7 — PORTD bit 7 / parallel slave port data |
| Pin 41 | AVSS — Analog ground reference |
| Pin 42 | AVDD — Analog positive supply |
| Pin 43 | VSS — Ground reference (digital) |
| Pin 44 | VDD — Positive supply voltage (digital) |
Typical Applications
PIC16F77T-E/PT is suitable for 6 applications: Industrial Automation Controllers, Motor Control Subsystems, HVAC and Thermostat Front-Ends, Consumer Appliance Control, Sensor Signal Preprocessing, Automotive Interior Accessories (Non-Safety).
Industrial Automation Controllers
The PIC16F77T-E/PT fits industrial automation controllers because it combines 14 KB of Flash with deterministic 200 ns instruction cycles, 33 digital I/O lines, and a wide 4.0V-5.5V supply range. Its on-chip USART and analog comparators handle RS-485 sensor interfaces directly, while the 20 MHz clock supports 9-bit address detect protocols common in factory automation. The TQFP-44 footprint simplifies SMT assembly for control-cabinet PCBs and reduces cost per I/O line.
Recommended
Motor Control Subsystems
The PIC16F77T-E/PT works well in motor control subsystems because its Capture/Compare/PWM modules and 20 MHz instruction rate deliver accurate commutation timing for brushed DC and small BLDC motors. The integrated 10-bit ADC samples back-EMF or current-sense signals fast enough to support 20 kHz PWM, while the 33 I/O lines accept quadrature encoders and direction logic. The TQFP-44 footprint tolerates the thermal rise of continuous switching through built-in brown-out reset protection.
Recommended
HVAC and Thermostat Front-Ends
The PIC16F77T-E/PT suits HVAC and thermostat front-ends because its 10-bit ADC and analog comparators handle NTC thermistor networks and supply-voltage monitoring with sufficient resolution. The 14 KB Flash stores scheduling logic, while the 368-byte RAM covers setpoint buffers and UI state. Low-power modes plus brown-out reset extend battery life during brown-outs common in HVAC wiring, all within the industry-standard 5V supply range.
Recommended
Consumer Appliance Control
The PIC16F77T-E/PT serves consumer appliance control panels due to its 33 I/O pins driving LED indicators, keypad matrices, and 7-segment displays. The ICSP interface supports in-field firmware updates after assembly, while 5V supply compatibility eliminates level shifters for legacy appliance power rails. The TQFP-44 footprint supports both hand-soldered prototypes and high-volume SMT production runs.
Recommended
Sensor Signal Preprocessing
The PIC16F77T-E/PT integrates sensor preprocessing through its 10-bit ADC, two analog comparators, and hardware USART, accepting raw sensor voltages and transmitting conditioned values over UART. The 20 MHz clock keeps ADC sampling latency under 10 us, supporting vibration and pressure monitoring up to several kHz. Industrial-grade -40C to +125C operation suits outdoor enclosures and process instrumentation.
Recommended
Automotive Interior Accessories (Non-Safety)
The PIC16F77T-E/PT powers non-safety automotive interior accessories such as lighting controllers, seat-position memories, and accessory timers. The extended -40C to +125C temperature window tolerates cabin and engine-bay-adjacent environments, while the 14 KB Flash covers the most accessory sequencing stacks. Brown-out reset and watchdog timer improve robustness against cranking transients on 12V rails.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F77T-E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F777T-I/PT | PIC16F777-E/PT | PIC16F77-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Flash Program Memory | 14 KB | 14 KB | 14 KB | 14 KB |
| RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC | 10-bit | 10/12-bit selectable | 10/12-bit selectable | 10-bit |
| nanoWatt Power Management | No | Yes | Yes | No |
| Temperature Range | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C |
Key Differentiators
- Lower cost baseline with mature PIC16F feature set (vs PIC16F777T-I/PT)
- Extended temperature range option on E suffix (vs PIC16F77-I/PT)
- Larger I/O count than lower-pin PIC16F cousins (vs PIC16F76T-E/SO)
Design Notes
The PIC16F77T-E/PT operates from 4.0V to 5.5V. Brown-out reset typically triggers at 3.6V-4.0V to protect Flash during voltage dips. Add a 100nF decoupling capacitor within 5 mm of VDD pin 14 and an additional 10uF bulk capacitor on the supply rail to handle motor-control inrush without sag.
Keep the crystal traces between OSC1 and OSC2 as short and symmetric as possible, surrounded by a digital ground guard ring. AVDD/AVSS should have their own ferrite or LC filter stage to isolate analog supply noise from the digital VDD, and AVDD must be connected even if the ADC is unused (ties to internal references).
MCLR must be pulled high through a 10k resistor and bypassed with a 100nF capacitor; floating MCLR causes spurious resets. RB3 must be held low during normal operation unless LVP programming is intended, or the device will enter low-voltage programming mode unintentionally. ICSP pins PGC/PGD should be isolated with series resistors during in-circuit debug to avoid loading the programming signals.
Long PORTD bus traces (>50 mm) benefit from series 100-ohm terminators and a ground reference trace to control reflections in high-speed parallel reads. PORTC SPI pins (RC3/RC4/RC5) require matched-length routing for signals above 5 MHz to maintain data integrity. If using the parallel slave port, the PSPI/O bits in TRISE must be cleared for proper operation.
Compliance Information
RoHS compliance is indicated in the Microchip material declaration. The device is not AEC-Q100 qualified; for automotive-safety applications consider migrating to PIC16F1xxx or dsPIC30F families that carry AEC-Q100 grades.
