PIC16F877-20/PQ - 8-Bit 20MHz 14KB MCU 44-QFP | Microchip
MPN： PIC16F877-20/PQ ✓ 啟用中PIC16F877-20/PQ 概覽
A microcontroller is a programmable semiconductor that integrates a processor core, memory, digital I/O, timers, serial interfaces, and optional analog conversion on one device. In the system hierarchy, the PIC16F877 belongs to the 8-bit MCU class, then to PIC16-family Flash microcontrollers. Its broad peripheral set allows one controller to supervise actuators, read sensors, communicate with external circuits, and implement control firmware without separate interface ICs.
Key verified features include 256 bytes of EEPROM data memory, self-programming, eight 10-bit ADC channels, two additional timers, two capture/compare/PWM functions, and a synchronous serial port configurable for 3-wire SPI or 2-wire I²C. The 20 MHz grade provides a 50 ns instruction-cycle basis before considering instruction duration and peripheral clocking. The 33 I/O lines provide substantial board-level connectivity while remaining within the limits of a compact embedded design.
The PIC16F877 architecture combines RISC-like single-word instructions with Flash program memory. Its peripheral partitioning supports protocol handling, timing, pulse-width modulation, and analog measurement without relying on a host processor. The eight-channel 10-bit ADC is useful for monitoring mixed-signal equipment, while EEPROM retains calibration values or configuration data. Self-programming can support applications that need controlled parameter updates after deployment.
Typical uses include industrial controllers, data-acquisition equipment, motor and relay control, instrumentation, communications gateways, and compact embedded products. The 20 MHz rating is appropriate for real-time control loops when the firmware budget and interrupt latency satisfy the application. The 44-pin package requires careful escape routing but provides more I/O and peripheral connectivity than smaller MCU packages.
Designers should use the manufacturer datasheet for the exact pin assignments, electrical limits, timing characteristics, and programming specification. PCB layout must preserve decoupling placement, oscillator stability, analog-reference integrity, and programming access. Because only distributor and manufacturer snippets were supplied here, unverified details remain explicitly marked in the specifications rather than inferred.
直接替換替代品，適用於 PIC16F877-20/PQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16F877-20/PQ （相同外形與佔位） — 差異在於 Package, ADC, Timers, I/O Pins, Operating Temperature.
PIC16F877-20/I/PQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F877-20E/PQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F877-20T/PQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F877A-20/PQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F877-20/SS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F877-20/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC16F877-20/PQ 最大額定值與電氣特性
| Microcontroller Type | 8-bit CMOS Flash microcontroller |
| 最大時脈頻率 | 20 MHz |
| Program Memory | 14 KB Flash |
| Program Memory Organization | 8K x 14 words |
| Data EEPROM | 256 bytes |
| RAM | 368 bytes |
| I/O Pins | 33 |
| ADC Resolution | 10 bits |
| ADC Channels | 8 channels |
| Timers | 3 timers, including 2 additional timers |
| Capture/Compare/PWM Functions | 2 functions |
| Synchronous Serial Port | Configurable as 3-wire SPI or 2-wire I²C |
| Self-Programming | Supported |
| In-Circuit Debug Support | ICD supported |
| 封裝 | 44-MQFP (10 x 10 mm) |
| 安裝類型 | Surface mount |
PIC16F877-20/PQ 44-mqfp (10 x 10 mm) 腳位配置指南
PIC16F877-20/PQ（44-mqfp (10 x 10 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： PIC16F877-20/PQ.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC16F877-20/PQ 適用於 6 應用s: Industrial Control Controller, Eight-Channel Data Acquisition, Motor and PWM Control, Instrumentation and Measurement Hub, Communications Gateway, Legacy Embedded Product Upgrade.
Industrial Control Controller
The PIC16F877-20/PQ fits compact machine-control boards because its 20 MHz clock provides useful timing headroom while 33 I/O pins connect discrete sensors, relays, and actuators. The eight 10-bit ADC channels can monitor pressure, temperature, or position inputs without a separate converter, while three timers support event timing and motor or relay control. SPI or I²C provides a path to sensors, displays, and data loggers. Design the 20 MHz implementation around verified timing, isolate noisy industrial wiring, and validate watchdog behavior, reset states, and analog accuracy before production.
推薦
Eight-Channel Data Acquisition
PIC16F877-20/PQ is appropriate for small multichannel acquisition systems because Microchip verifies eight 10-bit ADC channels, 256 bytes of EEPROM, and 33 I/O pins. Firmware can scan sensors, apply calibration, store settings in EEPROM, and transmit results through SPI or I²C. The 20 MHz clock offers headroom for acquisition sequencing and control calculations, but conversion timing, sample-and-hold behavior, input range, reference accuracy, and noise performance must be read from the official datasheet. Analog grounding and shielding should be separated from switching and relay return currents.
推薦
Motor and PWM Control
The PIC16F877-20/PQ can serve as the supervisory controller for motors, valves, and lamps because the verified feature set includes two capture/compare/PWM functions and two additional timers. Twenty-MHz operation leaves timing margin for position decoding, pulse generation, fault handling, and serial diagnostics, while the ADC channels can monitor current or position feedback. PWM resolution and motor-drive topology depend on the selected timer and peripheral implementation, which must be confirmed in the datasheet. Keep switching-node currents away from sensitive analog and oscillator paths.
推薦
Instrumentation and Measurement Hub
PIC16F877-20/PQ is useful as the control hub for laboratory or process instrumentation that must combine digital I/O, timing, ADC measurement, and compact serial communication. Its 14 KB Flash supports moderate protocol and control firmware, while EEPROM can retain calibration constants or setup data. SPI or I²C allows connection to displays, sensors, converters, or storage, and ICD support can assist bring-up. The instrument should define acquisition latency, calibration strategy, fault recovery, and communication protocol before coding because the 368 bytes of RAM constrain multi-buffer data handling.
推薦
Communications Gateway
PIC16F877-20/PQ can support a small protocol gateway or embedded communications controller because the synchronous serial port supports SPI or I²C, while 33 I/O lines provide multiple chip-select, interrupt, and status signals. The 20 MHz class can process framing and basic protocol tasks, but application-specific UART, CAN, Ethernet, or higher-throughput behavior must be implemented with verified external hardware. A gateway design should budget protocol latency and RAM carefully, provide deterministic buffer management, and test bus isolation, termination, and fault recovery rather than treating the MCU as an automatic network interface.
推薦
Legacy Embedded Product Upgrade
PIC16F877-20/PQ is a practical fit when maintaining or redesigning an established PIC16F877-based product that needs the 20 MHz grade, 14 KB Flash, and 33 I/O in 44-MQFP. EEPROM supports persistent settings, ADC channels can preserve analog interfaces, and SPI/I²C can retain existing serial peripherals. Because compatibility depends on the original schematic, oscillator circuit, programming toolchain, and firmware assumptions, migration should begin with a pin-by-pin and register-level review. Validate brownout behavior, watchdog settings, startup timing, and production programming before releasing a replacement board.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16F877-20/PQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16F877-20/I/PQ | PIC16F877-20E/PQ | PIC16F877-20T/PQ | PIC16F877A-20/PQ | PIC16F877-20/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
主要差異化特點
- Higher verified clock rating than the compared 4 MHz PIC16F877 variant (對比PIC16F877-04/PQ)
- Exact distributor availability at the requested 44-MQFP package and speed grade (對比PIC16F877-20/PT)
- Integrated mixed-signal and communications resources (對比Microchip PIC16F887 migration candidate)
設計說明
Route the MCU supply from a low-impedance source and place its decoupling network directly at the package power pins. Follow the exact capacitor values, voltage tolerances, and additional analog-supply requirements in the Microchip datasheet; those values were not included in the supplied snippets. Estimated: power dissipation is P = VDD × IDD, so every additional milliamp at 5 V adds 5 mW. Keep switching-regulator and relay supplies physically separated from analog and oscillator return paths.
Design the 44-MQFP footprint from the official Microchip package drawing and verify pin 1, exposed or underside features if present, solder mask, paste, and assembly clearances before fabrication. The verified source confirms a 10 x 10 mm MQFP but does not provide a land pattern. Provide programming-test pads, ground return around noisy pins, and short oscillator traces. A 3D model should not replace cross-checking the released mechanical drawing and assembly notes.
Treat oscillator, RESET, programming, and analog-reference routes as dedicated nets with short paths and stable return references. Keep ADC traces away from relay-coil, motor-switching, clock, and high-di/dt nets; use a quiet ground region where practical. The 20 MHz clock can make small routing errors consequential, so validate edge rates and settling with the actual external load, bus capacitance, firmware, and peripherals rather than relying only on nominal clock frequency.
Do not substitute a lower-speed or different-package suffix solely from a similar family name. The supplied comparison shows PIC16F877-04/PQ runs at 4 MHz, a 75% reduction from the target's 20 MHz, while /PT is associated with a different package in the compared part. Build a replacement checklist covering exact MPN, package drawing, pin names, supply limits, oscillator configuration, memory size, peripheral registers, programming toolchain, bootloader assumptions, and lifecycle commitments.
合規資訊
No verified compliance declarations were present in the supplied manufacturer and distributor snippets. Compliance values remain unknown rather than inferred. AEC-Q100 applicability also cannot be determined from the provided data.
