PIC16F877AT-I/PTG - 8-bit 20MHz MCU 14KB Flash TQFP-44 | Microchip
MPN: PIC16F877AT-I/PTG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.45 | $84.50 |
| 100 | $7.65 | $765.00 |
| 500 | $6.9 | $3,450.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16F877AT-I/PTG Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, program memory (Flash/ROM), working memory (RAM), non-volatile data storage (EEPROM), and peripherals such as timers, ADC, communication ports, and I/O. The PIC16F87x family is part of Microchip's mid-range 8-bit MCU lineup, sitting in the hierarchy: PIC16F87x -> PIC16 mid-range -> 8-bit MCU -> microcontroller -> semiconductor IC. PIC MCUs use a Harvard architecture with separate program and data buses, RISC instruction set, and a 14-bit instruction word, which simplifies instruction decoding and enables deterministic throughput.
Key features of the PIC16F877AT-I/PTG include a 20 MHz maximum operating frequency, an integrated 10-bit multi-channel Analog-to-Digital Converter, two 8-bit timers and one 16-bit timer, a USART, MSSP (SPI/I2C), PSP parallel slave port, and brown-out reset (BOR). The wide operating voltage range of 2.0V to 5.5V (industrial -40C to +85C) supports both 3.3V and 5V designs. The device also supports in-circuit serial programming (ICSP) and in-circuit debugger (ICD) interfaces, enabling field firmware updates without removing the chip from the board.
Architecturally, the PIC16F877A employs a 14-bit instruction word, 8-level hardware stack, and 35 single-word instructions, which together produce compact assembly code and efficient high-level language compilation. The 25-year silicon heritage of this part has made it a reference design platform for educational institutions and legacy industrial systems worldwide.
Typical applications include industrial automation controllers, sensor interface front-ends, motor control driver boards, instrumentation and data acquisition, automotive body electronics, and educational prototyping boards. The combination of rich peripherals and breadboard-friendly TQFP package has made this device a workhorse for both hobbyist and professional designs.
When designing with this part, ensure decoupling capacitors (0.1 uF and 10 uF) are placed within 5 mm of the VDD pins. Use the ICSP connector footprint on every PCB layout even if in-system programming is not initially required - this preserves future firmware flexibility.
This page consolidates distributor pricing, drop-in alternatives, and practical engineering guidance that supplements - but does not replace - the manufacturer datasheet.
Drop-in alternatives for PIC16F877AT-I/PTG — 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 PIC16F877AT-I/PTG (same form factor and footprint) — differing in Package, Timers, Operating Temperature, ADC, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F877A-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877-20I/PT
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC16F877A-E/PT
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →PIC16F874AT-I/PT
✅ Drop-In✓ In Stock
$6.95 / Unit
View Datasheet →PIC18F4520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877AT-I/PTG Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16, 8-bit RISC, 14-bit instruction word |
| Program Memory Type | Flash |
| Program Memory Size | 14 KB (8K x 14 words) |
| RAM | 368 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage Range | 4.0 V to 5.5 V (4.5 V to 5.5 V for industrial per source) |
| Operating Temperature | -40 C to +85 C (Industrial, "I" grade) |
| Digital I/O Pins | 33 |
| ADC | 10-bit, 8 channels |
| Timers | Two 8-bit + One 16-bit (3 total) |
| Capture/Compare/PWM | 2 CCP modules |
| Communication | USART (SCI), MSSP (SPI / I2C), PSP |
| Package | 44-pin TQFP (MQFP-44), 10 x 10 mm, 2 mm height, MS-022 |
| Mounting Type | Surface Mount |
| Packaging Type | Tape & Reel (suffix "G") |
| MSL Level | 3 (per typical Microchip TQFP-44 profile) |
| Lead-Free / RoHS | Lead Free / RoHS Compliant |
PIC16F877AT-I/PTG Pin Configuration
| Pin 1 | MCLR#/VPP — Master Clear (active-low reset) / programming voltage input |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 7 | RA5/AN4/SS# — Digital I/O / Analog input channel 4 / SPI slave select |
| Pin 8 | RE0/RD#/AN5 — Digital I/O / Parallel slave read strobe / Analog ch5 |
| Pin 9 | RE1/WR#/AN6 — Digital I/O / Parallel slave write strobe / Analog ch6 |
| Pin 10 | RE2/CS#/AN7 — Digital I/O / Parallel slave chip select / Analog ch7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock |
| Pin 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 PWM |
| Pin 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — Digital I/O / Parallel slave port data bit 0 |
| Pin 20 | RD1/PSP1 — Digital I/O / Parallel slave port data bit 1 |
| Pin 21 | RD2/PSP2 — Digital I/O / Parallel slave port data bit 2 |
| Pin 22 | RD3/PSP3 — Digital I/O / Parallel slave port data bit 3 |
| Pin 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Digital I/O / SPI data out |
| Pin 25 | RC6/TX/CK — Digital I/O / USART transmit / USART clock |
| Pin 26 | RC7/RX/DT — Digital I/O / USART receive / USART data |
| Pin 27 | RD4/PSP4 — Digital I/O / Parallel slave port data bit 4 |
| Pin 28 | RD5/PSP5 — Digital I/O / Parallel slave port data bit 5 |
| Pin 29 | RD6/PSP6 — Digital I/O / Parallel slave port data bit 6 |
| Pin 30 | RD7/PSP7 — Digital I/O / Parallel slave port data bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0/INT — Digital I/O / External interrupt input |
| Pin 34 | RB1 — Digital I/O |
| Pin 35 | RB2 — Digital I/O |
| Pin 36 | RB3/PGM — Digital I/O / Low-voltage ICSP programming |
| Pin 37 | RB4 — Digital I/O / interrupt-on-change |
| Pin 38 | RB5 — Digital I/O / interrupt-on-change |
| Pin 39 | RB6/PGC — Digital I/O / ICSP clock / interrupt-on-change |
| Pin 40 | RB7/PGD — Digital I/O / ICSP data / interrupt-on-change |
| Pin 41 | NC — Not connected (no internal bond) |
| Pin 42 | NC — Not connected (no internal bond) |
| Pin 43 | NC — Not connected (no internal bond) |
| Pin 44 | NC — Not connected (no internal bond) |
Typical Applications
PIC16F877AT-I/PTG is suitable for 6 applications: Industrial Automation Controller, Educational Development Board, Sensor Interface Front-End, Hobbyist Robotics Control, Automotive Body Electronics, Data Acquisition Module.
Industrial Automation Controller
The PIC16F877AT-I/PTG fits industrial automation controllers through its 33 digital I/O and 20 MHz 5 MIPS core, which drive relay banks, optocoupler inputs, and 4-20 mA loops. Its 10-bit ADC samples analog sensor feedback (pressure, flow, temperature) at 19.5 us per channel. The industrial -40 C to +85 C temperature range tolerates factory-floor thermal stress without active cooling.
Recommended
Educational Development Board
The PIC16F877AT-I/PTG is a staple of university microcontroller courses due to its comprehensive peripheral set in a breadboard-compatible TQFP-44 carrier. Students gain hands-on experience with the 10-bit ADC, two CCP PWM outputs, USART, and I2C/SPI bus. The 14 KB Flash fits full midterm projects including keypad scanning, LCD control, and serial communication stacks.
Recommended
Sensor Interface Front-End
The PIC16F877AT-I/PTG is widely deployed as a sensor hub that aggregates analog and digital signals into a serial datastream. Its 8-channel ADC multiplexes thermocouples, RTDs, and strain gauges; the USART pushes processed readings to a host controller. Hardware I2C/SPI peripherals connect directly to MEMS accelerometers, pressure sensors, and digital temperature ICs without bit-banging.
Recommended
Hobbyist Robotics Control
The PIC16F877AT-I/PTG suits small robotics platforms where its two CCP modules generate complementary PWM for driving half-bridge motor drivers. The 20 MHz core handles line-following, obstacle avoidance, and PID control loops in real time. Hobbyists value the extensive legacy code base, free MPLAB X IDE, and large community of PIC16F877A example projects available online.
Recommended
Automotive Body Electronics
The PIC16F877AT-I/PTG is deployed in non-safety automotive body modules such as HVAC blend-door actuators and lighting controllers. Its 33 I/O lines interface directly with switch panels and LED drivers; the 10-bit ADC monitors thermistor inputs. Per Microchip automotive-grade guidance, AEC-Q100 qualified variants (PIC16F877A-I/PT automotive screening) are required for OEM production.
Recommended
Data Acquisition Module
The PIC16F877AT-I/PTG functions as a compact multi-channel data logger, leveraging its 8-channel 10-bit ADC, USART, and I2C bus to record process variables. The 256-byte EEPROM stores calibration coefficients and sample timestamps, while 368 bytes of RAM buffer A/D bursts before serial transmission. Battery-powered deployments benefit from the device's deep-sleep current of less than 1 uA.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F877AT-I/PTG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877A-I/PT | PIC16F877-20I/PT | PIC16F877A-E/PT | PIC16F874AT-I/PT | PIC18F4520-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT) 10x10 mm | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC16 8-bit, 14-bit instruction, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC18 8-bit, 16-bit instruction, 40 MHz |
| Flash Memory | 14 KB | 14 KB | 14 KB | 14 KB | 7 KB (-50%) | 32 KB (+129%) |
| RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes (-48%) | 1536 bytes (+317%) |
| Digital I/O | 33 | 33 | 33 | 33 | 33 | 36 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 13 channels |
| Operating Temperature | -40 C to +85 C (Industrial "I") | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| 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 | 4.2 V to 5.5 V |
| Q1-1 Price (USD) | 9.20 | 8.85 | 8.10 | 9.40 | 8.95 | 7.60 |
Key Differentiators
- Lower operating voltage range than PIC18F4520-I/PT (vs PIC18F4520-I/PT)
- Full 14 KB Flash memory at lower price point than PIC16F877A-E/PT (vs PIC16F877A-E/PT)
- More Flash than PIC16F874AT-I/PT (vs PIC16F874AT-I/PT)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11 and 32) and a single 10 uF bulk tantalum or ceramic capacitor at the board power entry. The PIC16F877AT-I/PTG draws up to 35 mA at 20 MHz with all peripherals active; ensure the 5 V regulator has at least 100 mA headroom. Use a ferrite bead on AVDD if analog noise from digital switching affects ADC readings.
Route the ICSP signals PGC (RB6) and PGD (RB7) on the top copper layer straight to a 6-pin header footprint - never place series resistors on these lines. Keep crystal traces (OSC1/OSC2) short and guarded by a ground pour to minimize EMI pickup. For TQFP-44, use 0.20 mm trace/space with 0.25 mm via-in-pad if board density requires it; otherwise 0.30 mm is sufficient for 5 V signals.
Never tie MCLR# directly to VDD without a 10 kohm pull-up and a 100 nF decoupling cap; otherwise the part will reset randomly in noisy environments. Do not exceed the Flash endurance rating of 100 K erase/write cycles - implement wear-leveling in EEPROM emulation if frequent writes are needed. When using the internal ADC, set the A/D acquisition time to at least 19.5 us or sample accuracy will degrade.
Compliance Information
RoHS compliant per Microchip product page. Standard industrial-grade; for AEC-Q100 automotive qualification use the PIC16F877AT-I/PT automotive screening variant - not the -I/PTG suffix used here.
