PIC16F877A-E/PT - 8-Bit 20MHz 14KB Flash MCU 44-TQFP | Microchip
料号： PIC16F877A-E/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.62 | $11.62 |
| 10 | $10.45 | $104.50 |
| 100 | $9.32 | $932.00 |
| 500 | $8.55 | $4,275.00 |
| 1,000 | $7.8 | $7,800.00 |
PIC16F877A-E/PT 概述
What is a PIC16F877A? The PIC16F877A belongs to Microchip's PIC16 family of 8-bit microcontrollers (MCU) within the broader mid-range PICmicro architecture. As a microcontroller, it integrates CPU, program memory, data memory, EEPROM, timers, ADC, USART, I/O ports and other peripherals onto a single chip. Microcontrollers sit hierarchically under embedded processors -> processors -> semiconductors, and the PIC16F877A specifically targets mid-complexity embedded control tasks where deterministic interrupt response and low power are required.
Key feature highlights of the PIC16F877A-E/PT include 33 digital I/O pins, a 10-bit 8-channel Analog-to-Digital Converter (ADC), two 8-bit timers plus one 16-bit timer, two Capture/Compare/PWM (CCP) modules, a Master Synchronous Serial Port (MSSP) supporting both SPI and I2C, a USART with RS-485 support, a Parallel Slave Port (PSP), and a Brown-Out Reset (BOR) circuit. The -E temperature grade denotes the -40C to +125C extended industrial operating range, suitable for harsh-environment applications.
Architecturally, the PIC16F877A uses a 14-bit instruction word with a Harvard-style separate code and data bus, providing deterministic single-cycle instruction execution (200 ns at 20 MHz). The 35 single-word instruction RISC-like instruction set simplifies code generation and learning, which is why the PIC16F877A remains one of the most widely taught microcontrollers in universities and embedded courses.
Typical applications include industrial automation control, sensor data acquisition, motor and lighting control, instrumentation, RS-232/RS-485 networked sensor nodes, hobbyist and education platforms, and mid-range consumer product controllers. The wide supply range of 2.0V to 5.5V and low-power sleep modes extend battery-operated use cases.
Design consideration: when migrating to the PIC16F877A-E/PT, the 44-pin TQFP footprint must be matched on the PCB; the legacy 40-pin DIP variant uses package code -P and is not pin-compatible. Ensure your programmer/debugger supports ICSP on PGEC1/PGED1 (pins 39/40). Use MPLAB X IDE and the XC8 compiler for firmware development.
This page synthesizes distributor pricing, drop-in compatible alternatives, application reference circuits and practical design notes not collected on a single manufacturer datasheet page.
直接替换替代料： PIC16F877A-E/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16F877A-E/PT （相同外形与封装尺寸） ——差异在于 Timers, Package, ADC, Core Architecture, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
PIC16F877A-I/PT
✅ 直接替换✓ 有现货
$4.95 / 个
查看数据手册 →PIC16F877-20I/PT
✅ 直接替换✓ 有现货
$5.1 / 个
查看数据手册 →PIC16F877-04E/PT
✅ 直接替换✓ 有现货
$3.25 / 个
查看数据手册 →PIC16F887-E/PT
✅ 直接替换✓ 有现货
$2.75 / 个
查看数据手册 →PIC16F874AT-I/PT
✅ 直接替换✓ 有现货
$6.95 / 个
查看数据手册 →PIC16F874A-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC16F877A-E/PT 最大额定值与电气特性
| Core Architecture | PIC16 (8-bit, 14-bit instruction word) |
| Maximum CPU Frequency | 20 MHz (200 ns instruction cycle) |
| MIPS | 5 MIPS |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data SRAM | 368 bytes |
| Data EEPROM | 256 bytes |
| Digital I/O Pins | 33 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit + 1 x 16-bit |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | MSSP (SPI/I2C), USART (RS-485) |
| Parallel Slave Port | Yes (8-bit PSP) |
| Brown-Out Reset (BOR) | Yes |
| Operating Voltage | 2.0 V to 5.5 V |
| 工作温度 | -40C to +125C (extended -E grade) |
| 封装 | 44-pin TQFP (PT), 10x10 mm |
| 安装类型 | Surface Mount |
| Instruction Set | 35 single-word instructions |
| ICSP Programming | Yes (PGEC1/PGED1) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
PIC16F877A-E/PT 引脚配置
| 引脚 1 | MCLR/VPP/THV — Master Clear (active-low reset) / ICSP programming voltage |
| 引脚 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 引脚 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 引脚 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC negative reference |
| 引脚 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC positive reference |
| 引脚 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / Comparator 1 output |
| 引脚 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / Analog input 4 / SPI Slave Select / Comparator 2 output |
| 引脚 8 | RE0/RD/AN5 — PORTE bit 0 / Parallel Slave Port read control / Analog input 5 |
| 引脚 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel Slave Port write control / Analog input 6 |
| 引脚 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel Slave Port chip select / Analog input 7 |
| 引脚 11 | VDD — Positive supply voltage (+2.0V to +5.5V) |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| 引脚 14 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| 引脚 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| 引脚 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| 引脚 17 | RC2/CCP1 — PORTC bit 2 / CCP1 module (PWM/Capture/Compare) |
| 引脚 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 引脚 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port data bit 0 |
| 引脚 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port data bit 1 |
| 引脚 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port data bit 2 |
| 引脚 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port data bit 3 |
| 引脚 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 引脚 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| 引脚 25 | RC6/TX/CK — PORTC bit 6 / USART asynchronous transmit / synchronous clock |
| 引脚 26 | RC7/RX/DT — PORTC bit 7 / USART asynchronous receive / synchronous data |
| 引脚 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port data bit 4 |
| 引脚 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port data bit 5 |
| 引脚 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port data bit 6 |
| 引脚 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port data bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply voltage (+2.0V to +5.5V) |
| 引脚 33 | RB0/INT — PORTB bit 0 / External interrupt |
| 引脚 34 | RB1 — PORTB bit 1 |
| 引脚 35 | RB2 — PORTB bit 2 |
| 引脚 36 | RB3/PGM — PORTB bit 3 / Low-voltage ICSP programming entry |
| 引脚 37 | RB4 — PORTB bit 4 |
| 引脚 38 | RB5 — PORTB bit 5 |
| 引脚 39 | RB6/PGC — PORTB bit 6 / ICSP clock (PGEC1) |
| 引脚 40 | RB7/PGD — PORTB bit 7 / ICSP data (PGED1) |
| 引脚 41 | NC — Not connected (per datasheet) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC16F877A-E/PT 适用于 7 应用s: Industrial Sensor Data Acquisition, Educational Microcontroller Platform, Motor and Lighting PWM Control, RS-232/RS-485 Communication Gateway, Consumer Appliance Controllers, Battery-Powered Remote Sensor Nodes, Hobbyist and Maker Projects.
Industrial Sensor Data Acquisition
The PIC16F877A-E/PT is well suited for multi-channel industrial sensor acquisition nodes thanks to its 10-bit 8-channel ADC, 14 KB Flash for protocol stacks and 368-byte RAM for sample buffering. The integrated MSSP and USART let a single chip digitize 4-20 mA or 0-10 V sensor inputs through op-amp front ends while concurrently driving an RS-485 Modbus network at 115200 bps. The -40C to +125C extended temperature grade allows deployment inside unheated outdoor cabinets or near motor drives, where commercial-grade MCUs would fail. Compared to a discrete ADC + 8051 design, the integrated peripheral set reduces PCB area to under 25x25 mm and total BOM by approximately 30%.
推荐
Educational Microcontroller Platform
The PIC16F877A has been the de-facto teaching platform for 8-bit embedded courses for two decades because of its 35-instruction RISC-like ISA, deterministic 200 ns instruction cycle and abundant academic reference material. The /PT 44-pin TQFP package enables surface-mount soldering labs, while the same silicon in /P DIP package supports breadboard prototyping. Universities typically pair it with the MPLAB X IDE, XC8 compiler, and PICkit 3/4 programmer on the PGEC1/PGED1 ICSP pins. The 14 KB Flash is large enough for laboratory exercises covering GPIO, timers, ADC, I2C and UART peripherals, while still fitting within student-project budgets.
推荐
Motor and Lighting PWM Control
The PIC16F877A-E/PT dual Capture/Compare/PWM (CCP) modules generate two independent PWM channels with 10-bit resolution, sufficient for DC motor speed control, LED dimming and small stepper drives. Combined with the 16-bit timer base, complementary PWM with dead-band insertion for half-bridge drivers is achievable in firmware. The integrated 10-bit ADC samples current or potentiometer feedback in real time, enabling closed-loop PI control with millisecond update rates. The 2.0V-5.5V supply range allows direct operation from a 3.3V regulator, simplifying power tree design in 3.3V-only systems while still supporting 5V peripheral drivers when needed.
推荐
RS-232/RS-485 Communication Gateway
The PIC16F877A-E/PT USART module supports both RS-232 point-to-point and RS-485 multi-drop industrial networks at speeds up to 115200 bps, while the MSSP delivers SPI or I2C for local peripheral extension. A common gateway application uses the USART as an RS-485 Modbus master talking to field sensors, with the MSSP in I2C mode driving an EEPROM, RTC or small OLED display on the local board. The 256-byte internal EEPROM stores configuration and node address. Compared to a host-CPU + external UART design, the integrated approach reduces chip count and simplifies firmware task scheduling.
推荐
Consumer Appliance Controllers
Mid-complexity consumer appliances - rice cookers, washing-machine control boards, microwave user interfaces and small HVAC thermostats - are exactly the segment the PIC16F877A-E/PT was designed for. The 33 GPIO pins drive multiplexed keypads, 7-segment or character LCDs, status LEDs and relay triacs without external I/O expanders. The 14 KB Flash holds state-machine firmware plus menu string tables, while the 256-byte EEPROM remembers user settings after power loss. The wide 2.0V-5.5V supply range is forgiving of rectified mains ripple, and the -40C to +125C extended temperature grade is robust against steam, oven-adjacent and unheated-closet environments.
推荐
Battery-Powered Remote Sensor Nodes
The PIC16F877A-E/PT supports multiple low-power modes (Sleep, Idle, and Watchdog-driven wake-up) that drop quiescent current to microampere levels, making it viable for battery or solar-powered remote sensor nodes. Sleep current at 3V is typically under 1 uA with the Watchdog Timer enabled, allowing 2-5 year operation from a single 3.6V lithium AA cell when duty-cycled at 1% (e.g. one wake per minute, 50 ms active). The 10-bit ADC digitizes temperature, humidity or battery voltage during the active window, then data is logged or transmitted via UART or SPI. Brown-out reset protects against accidental writes during battery end-of-life.
推荐
Hobbyist and Maker Projects
Despite being a 20-year-old part, the PIC16F877A remains widely used in DIY electronics, robotics and Maker Faire projects because of its enormous code-example base, low cost (under $12 in unit quantities) and broad third-party support. It integrates ADC, PWM, I2C, SPI and UART in one chip, so makers can build line-following robots, RC receivers, aquarium controllers and home automation nodes with a single IC plus a few discretes. The MPLAB X IDE and XC8 compiler are free, and the PICkit 3/4 programmer costs under $50, keeping the development barrier low. For users new to PIC microcontrollers, the 44-pin TQFP can be adapted to breadboard via a breakout board or replaced with the 40-pin DIP -P variant on the same firmware.
推荐
推荐产品汇总
工程参考数据： PIC16F877A-E/PT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16F877A-I/PT | PIC16F877-20I/PT | PIC16F887-E/PT | PIC16F874AT-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Flash Program Memory | 14 KB (8K x 14) | 14 KB | 14 KB | 14 KB | 7 KB |
| Data SRAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| Max CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Resolution | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 14 channels | 10-bit, 8 channels |
| Operating Temperature | -40C to +125C (extended -E) | -40C to +85C (industrial -I) | -40C to +85C (industrial -I) | -40C to +125C (extended -E) | -40C to +85C (industrial -I) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
关键差异点
- Extended -40C to +125C temperature grade vs industrial -40C to +85C （对比 PIC16F877A-I/PT)
- Drop-in 44-pin TQFP replacement with more ADC channels and lower cost （对比 PIC16F887-E/PT)
- Larger 14 KB Flash vs 7 KB on PIC16F874A family （对比 PIC16F874AT-I/PT)
设计说明
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pin pair (pins 11/12 and 31/32 on the /PT TQFP). The PIC16F877A-E/PT draws switching currents during ADC conversion and CCP PWM transitions, and inadequate decoupling causes spurious ADC readings and CCP timing jitter. For noise-sensitive analog designs, add a bulk 10 uF tantalum at the supply entry plus ferrite bead, and place a small RC filter (10 ohm + 100 nF) on AVdd if AVdd is sourced separately from Vdd. Estimated: assuming IO = 20 mA transient at 20 MHz, supply lead inductance must be under 50 nH for less than 100 mV ripple.
Keep the 20 MHz crystal (or resonator) and its loading capacitors within 5 mm of pins 13 (OSC1) and 14 (OSC2). Route the crystal traces over a continuous ground plane with no signal crossings; ground pour stitching around the oscillator area reduces radiated EMI by approximately 10-15 dB. Avoid routing the ICSP lines PGC (pin 39) and PGD (pin 40) next to the oscillator, as ICSP is sensitive to clock noise during programming. For 44-pin TQFP reflow soldering, follow JEDEC J-STD-020 with MSL-1 floor life and a peak reflow of 250C; the lead-pitch of 0.8 mm requires 0.15 mm stencil apertures for reliable paste release.
Three common pitfalls when bringing up the PIC16F877A-E/PT: (1) confusing the package suffix - /P is 40-pin DIP, /PT is 44-pin TQFP, /L is 44-pin PLCC, /ML is 44-pin QFN; the PCB land pattern is NOT interchangeable. (2) Forgetting to disable the configuration-bit PWRT (Power-up Timer) can extend startup by 72 ms, which may violate timing-sensitive USB or RS-485 enumeration windows. (3) Using an in-circuit emulator (ICE) header that loads the crystal oscillator can shift the clock frequency by several percent; always characterize timing with the production ICSP header installed. Source: Microchip PIC16F877A datasheet and Microchip TB077 application note on configuration bits.
The PIC16F877A-E/PT ADC achieves its 10-bit accuracy only when the analog source impedance is under 10 kohm; higher-impedance sensors require an op-amp buffer (such as MCP6002 or MCP6021) before the AN0-AN7 input. Acquisition time must be set to a minimum of 1.4 uS at 20 MHz to allow the internal sample capacitor to fully charge. For ESP-sensitive designs, set the ADC clock to a frequency derived from Fosc/16 or Fosc/32, not Fosc/2, to minimize digital switching noise coupling into the analog section. Estimated: at 10 kohm source impedance and 20 pF hold capacitor, the RC time constant is 200 ns, requiring approximately 1 uS acquisition time for 10-bit settling.
合规信息
RoHS compliant per Microchip product page. NOT AEC-Q100 qualified; for automotive designs use AEC-Q100-grade PIC16F1939 or dsPIC33 families. Halogen-free status not explicitly stated in provided web data.