PIC16F877-20I/PT - 8-Bit 20MHz 14KB Flash MCU 44-TQFP | Microchip
料号： PIC16F877-20I/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.16 | $71.60 |
| 100 | $6.36 | $636.00 |
| 500 | $5.71 | $2,855.00 |
| 1,000 | $5.1 | $5,100.00 |
PIC16F877-20I/PT 概述
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, ALU, program counter, RAM, ROM/FLASH, and integrated peripherals. The PIC architecture is a RISC design with only 35 single-word instructions, making it beginner-friendly and deterministic for real-time control. Microcontrollers in the PIC16 family sit in the broader taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC, and are widely used in industrial, automotive (premium-line), consumer, and educational applications.
Key features include 20 MHz operation from 2.0 V to 5.5 V, an integrated ICD (In-Circuit Debugger) interface, self-programming support, brown-out reset (BOR), power-on reset (POR), watchdog timer (WDT), and an industrial temperature grade (-40C to +85C) denoted by the "I" suffix. The "-20" speed suffix specifies 20 MHz operation versus the 4 MHz / 10 MHz variants in the same family.
The PIC16F877 implements a Harvard architecture with separate program and data buses, 14-bit instruction width, and a hardware multiplier is not present, but single-cycle ALU ops deliver predictable timing. The device is upward code-compatible with PIC16C5X, PIC12CXXX, and PIC16C7X, simplifying migration from older designs.
Typical applications include industrial control systems, sensor interfacing, motor control (low-power), HVAC thermostats, security panels, instrumentation, and educational/development boards. The wide 2.0-5.5 V range simplifies battery and line-powered designs alike.
When designing, ensure adequate decoupling (0.1 uF + 10 uF bulk) close to VDD/AVDD/VSS pins and respect the 5.5 V absolute maximum on any pin to avoid latch-up. For new designs, Microchip recommends migrating to PIC16F887 or PIC16F877A for enhanced features and active lifecycle status.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： PIC16F877-20I/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： PIC16F877-20I/PT （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, Timers, ADC, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
PIC16F877A-20I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC16F887-I/PT
✅ 直接替换✓ 有现货
$1.66 / 个
查看数据手册 →PIC16F874-20I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC16F877-20I/P
✅ 直接替换✓ 有现货
$5.1 / 个
查看数据手册 →PIC16F877-20I/L
✅ 直接替换✓ 有现货
$9.05 / 个
查看数据手册 →PIC16F877-20/PT
✅ 直接替换✓ 有现货
$6.72 / 个
查看数据手册 →PIC16F877-20I/PT 最大额定值与电气特性
| Core Processor | PIC |
| Core Size | 8-Bit |
| 最大时钟频率 | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Size | 14 KB (8K x 14) FLASH |
| RAM Size | 368 bytes |
| EEPROM Size | 256 bytes |
| Number of I/O Pins | 33 |
| A/D Converter | 8 channels x 10-bit |
| Timers | Timer0, Timer1, Timer2 |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Connectivity | I2C, SPI, UART/USART |
| 电源电压 | 2.0 V to 5.5 V |
| 工作温度 | -40C to +85C (Industrial) |
| 封装 | 44-TQFP (10x10 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 3 |
| RoHS 状态 | Compliant |
PIC16F877-20I/PT 引脚配置
| 引脚 1 | MCLR/VPP — Master Clear (Reset) input / 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 — PORTA bit 2 / Analog input 2 |
| 引脚 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| 引脚 6 | RA4/AN4/TOCKI — PORTA bit 4 / Analog input 4 / Timer0 clock |
| 引脚 7 | RA5/AN5/SS — PORTA bit 5 / Analog input 5 / SPI Slave Select |
| 引脚 8 | RE0/RD/AN6 — PORTE bit 0 / Read control for Parallel Slave Port / Analog input 6 |
| 引脚 9 | RE1/WR/AN7 — PORTE bit 1 / Write control for PSP / Analog input 7 |
| 引脚 10 | RE2/CS/AN8 — PORTE bit 2 / Chip Select for PSP |
| 引脚 11 | VDD — Positive supply (+2.0V to +5.5V) |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKI — Oscillator crystal input / External clock |
| 引脚 14 | OSC2/CLKO — Oscillator crystal output / Clock output |
| 引脚 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| 引脚 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| 引脚 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| 引脚 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 引脚 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| 引脚 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| 引脚 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| 引脚 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port 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 transmit / USART clock |
| 引脚 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| 引脚 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| 引脚 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| 引脚 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| 引脚 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply (+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 |
| 引脚 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| 引脚 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| 引脚 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 41 | VSS — Ground reference |
| 引脚 42 | VDD — Positive supply (+2.0V to +5.5V) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC16F877-20I/PT 适用于 7 应用s: Industrial Control Systems, HVAC Thermostat Control, Security and Alarm Panels, Educational Microcontroller Boards, Sensor Data Acquisition Systems, Small Motor Control (DC, Stepper), Consumer Electronics Control Boards.
Industrial Control Systems
The PIC16F877-20I/PT is well-suited for industrial control due to its 14 KB FLASH, 33 I/O pins, 8-channel 10-bit ADC, and industrial -40C to +85C temperature grade. In PLC-style applications, the device can scan multiple sensors, drive relays through its I/O, and communicate via RS-485/USART. The PIC RISC architecture executes instructions in 200 ns at 20 MHz, providing deterministic control loops suitable for real-time monitoring. The integrated EEPROM (256 bytes) stores calibration data and configuration parameters that survive power cycles. Compared to discrete logic, this single-chip solution reduces BOM cost and PCB area.
推荐
HVAC Thermostat Control
The PIC16F877-20I/PT integrates the analog sensing, PWM actuator control, and user-interface I/O needed for HVAC thermostat designs in a single 44-TQFP package. Its 8-channel 10-bit ADC handles multiple temperature sensors (NTC thermistors or IC sensors like MCP9700), while its 2 CCP modules generate PWM signals to control fan speeds and valve actuators. The wide 2.0-5.5 V supply range allows direct operation from rectified 24 VAC HVAC line power with simple regulation. The 200 ns instruction cycle provides tight PID control loop timing, while 14 KB FLASH accommodates user-interface state machines and scheduling algorithms.
推荐
Security and Alarm Panels
Security alarm panels benefit from the PIC16F877-20I/PT's combination of 33 I/O pins for zone monitoring, integrated EEPROM for storing event logs, and serial connectivity for central-station reporting. The device can scan dozens of wired zones via matrix keypad scanning, drive sirens via PWM, and communicate over PSTN or GSM modules via USART. Brown-out reset (BOR) and watchdog timer (WDT) ensure reliable operation during power glitches common in security installations. The 14 KB FLASH stores the panel operating system plus custom zone logic, while 368 bytes RAM handles real-time event buffering.
推荐
Educational Microcontroller Boards
Universities and training centers use the PIC16F877-20I/PT in development boards because of its 35-instruction RISC architecture that beginners can master quickly. The 44-TQFP package exposes all 33 I/O pins on standard 0.1-inch header spacing through breakout boards, allowing students to wire LEDs, switches, sensors, and displays. ICD (In-Circuit Debugger) support means real-time breakpoint debugging is built-in without extra hardware. The combination of 14 KB FLASH, ADC, PWM, and serial peripherals makes it suitable for teaching ADC sampling, PWM motor control, I2C sensor interfacing, and UART communication in one platform.
推荐
Sensor Data Acquisition Systems
Multi-sensor data loggers benefit from the PIC16F877-20I/PT's 8-channel 10-bit ADC and 256-byte EEPROM for storing calibration constants. In environmental monitoring stations, the device can sample temperature, humidity, pressure, and gas sensors, time-stamp readings via software RTC, and store data to external EEPROM or SD cards via SPI. The 20 MHz CPU provides fast ADC conversion rates for high-speed sampling, while low-power sleep modes (with WDT wake-up) extend battery life in remote deployments. The wide 2.0-5.5 V supply range supports both 3.3 V sensor modules and 5 V legacy interfaces.
推荐
Small Motor Control (DC, Stepper)
The PIC16F877-20I/PT drives small DC and stepper motors through its 2 CCP (Capture/Compare/PWM) modules and general-purpose I/O, providing closed-loop speed or position control without external motor controllers. The 20 MHz CPU computes PID control loops in microseconds, while PWM frequencies up to 20 kHz avoid audible motor whine. Direction control via GPIO, current sensing via the ADC, and fault detection via interrupts create a complete single-chip motor controller in a 44-TQFP package. Industrial temperature grade and 5.5 V tolerance suit factory automation environments.
推荐
Consumer Electronics Control Boards
Consumer appliances (washing machines, dishwashers, microwave ovens, coffee machines) use the PIC16F877-20I/PT as a cost-effective system controller with sufficient I/O for user keypads, displays, and actuators. The 14 KB FLASH accommodates state machines for multi-mode operation, while 256 bytes EEPROM stores user preferences through power cycles. The integrated USART supports WiFi/Bluetooth module integration for smart-appliance variants. Industrial temperature tolerance suits under-cabinet and garage installations where temperatures vary widely.
推荐
推荐产品汇总
工程参考数据： PIC16F877-20I/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-20I/PT | PIC16F887-I/PT | PIC16F874-20I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Program Memory | 14 KB FLASH | 14 KB FLASH | 14 KB FLASH | 12 KB FLASH |
| RAM Size | 368 bytes | 368 bytes | 368 bytes | 192 bytes |
| EEPROM Size | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Number of I/O | 33 | 33 | 36 | 33 |
| Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC | 8ch x 10-bit | 8ch x 10-bit (enhanced) | 14ch x 10-bit (enhanced) | 8ch x 10-bit |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Lifecycle Status | Active (legacy recommended) | Active (recommended) | Active (preferred for new designs) | Active (legacy) |
关键差异点
- Industrial temperature grade as standard （对比 PIC16F877-20/PT)
- Identical silicon with surface-mount TQFP package （对比 PIC16F877-20I/P (PDIP-40))
- Legacy compatibility with active production （对比 PIC16F877A-20I/PT)
- More memory than PIC16F874 sibling （对比 PIC16F874-20I/PT)
设计说明
Decoupling: Place a 0.1 uF ceramic capacitor as close as possible to each VDD pin (11, 32, 42) and a single 10 uF tantalum or electrolytic bulk capacitor near the supply entry point. The PIC16F877 has multiple VDD/VSS pairs to reduce digital switching noise coupling into analog sections. For ADC accuracy, also decouple AVDD (when used) separately from DVDD. Estimated: switching transients on digital I/O can inject noise into the ADC if decoupling is inadequate; a poor layout can degrade ADC SNR by 1-2 LSBs.
Crystal/oscillator layout: Keep the crystal (or ceramic resonator) within 1 cm of OSC1 (pin 13) and OSC2 (pin 14), with a ground guard ring around the oscillator traces to prevent digital switching noise from coupling into the clock. Use short, equal-length traces from each crystal pin to the corresponding OSC pin. For high-speed or noisy designs, consider a 4-pin crystal oscillator module with its own ground and VDD pins instead of a discrete crystal.
MCLR pin: Pin 1 (MCLR/VPP) must NEVER be left floating. Use a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for typical reset circuits. The MCLR pin is also the programming voltage entry; floating or incorrectly biased MCLR can cause erratic operation or programming failure. For ICSP (In-Circuit Serial Programming), add an ESD protection diode and series resistor on MCLR. Also note that configuration bits (FOSC, WDTE, etc.) must be set correctly in code via __CONFIG directives or the device may not run after reset.
ADC input design: For accurate 10-bit ADC conversions, add a small RC filter (typically 100 ohm + 100 nF) on each analog input to filter switching noise from adjacent digital pins. The ADC sample-and-hold requires the source impedance to be below 2.5 kohm for full accuracy; if using higher-impedance sensors, add a unity-gain buffer (e.g., MCP6001 op-amp) between the sensor and the ADC pin. Acquisition time must be programmed appropriately based on source impedance.
合规信息
RoHS compliant per Microchip product page. Lead-free (Pb-free) TQFP package. Not AEC-Q100 qualified - for automotive designs requiring AEC-Q100, consider PIC16F877A-I/PT automotive variants. Microchip is QS-9000 compliant at its fabrication facilities.