PIC16F874-20/L - 20MHz 8-Bit Flash MCU | Microchip
MPN： PIC16F874-20/L ✗ 停產PIC16F874-20/L 概覽
An 8-bit microcontroller is a compact embedded-control device that combines a processor core, program memory, data memory, and peripherals on one integrated circuit. The PIC16F874-20/L executes a 200 nanosecond instruction cycle and supports a compact instruction set of 35 single-word instructions, allowing control logic to be implemented with efficient register-based operations. Its Flash-based architecture supports in-circuit programming and allows firmware to be updated without a separate programmable-memory device.
The verified product information identifies 7 KB of Flash program memory, 192 bytes of RAM, 33 I/O pins, and communication capabilities including I2C, SPI, and UART. These features make the PIC16F874-20/L appropriate for industrial embedded controllers, data-acquisition equipment, communications modules, and general-purpose control boards where multiple digital inputs and outputs are required. The 20 MHz maximum clock speed provides a useful balance between processing throughput, power consumption, and design simplicity.
The PLCC-44 package provides a mechanically robust, socket-compatible form factor for prototype boards, legacy control systems, and applications where field replacement is useful. Because the package uses a leaded surface-mount format rather than a fine-pitch package, the device is also practical for designs assembled without lead-free component placement constraints. The product designation includes the 20 MHz speed grade and the /L package and temperature-grade suffix.
The PIC16F874-20/L is a general-purpose MCU rather than a dedicated power, signal, or communications component. Designers should use the manufacturer datasheet for the complete pin assignment, electrical limits, timing characteristics, memory map, and peripheral configuration. The device should be selected when an established PIC16F874 design, Flash programmability, and a 44-pin PLCC footprint are more important than using the newest or smallest microcontroller in the family.
This page combines the verified manufacturer and distributor information for PIC16F874-20/L with practical sourcing, packaging, and design guidance. It highlights the 20 MHz operating speed, 7 KB Flash memory, 192-byte RAM, 33 I/O pins, and PLCC-44 package so engineers can quickly assess fit, programming requirements, and board compatibility before requesting a quote.
直接替換替代品，適用於 PIC16F874-20/L — 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： PIC16F874-20/L （相同外形與佔位） — 差異在於 Package, ADC, Timers, Instruction Cycle Time, Mounting Type.
PIC16F874-20/P
✅ 直接替換聯絡詢價
查看資料表 →PIC16F874A-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16F874-20/L 最大額定值與電氣特性
| Device Type | 8-bit CMOS Flash microcontroller |
| 最大時脈頻率 | 20 MHz |
| Instruction Execution Time | 200 ns |
| Program Memory | 7 KB Flash (4K x 14 words) |
| RAM | 192 bytes |
| General-Purpose I/O | 33 I/O pins |
| 封裝 | 44-pin PLCC (16.59 mm x 16.59 mm) |
| Programmable Memory Type | CMOS Flash |
| Instruction Set | 35 single-word instructions |
| Serial Interface - I2C | Supported |
| Serial Interface - SPI | Supported |
| Serial Interface - UART | Supported |
| Architecture | PIC architecture |
| 安裝類型 | Surface mount |
| Package Body Size | 16.59 mm x 16.59 mm |
PIC16F874-20/L 16.59 mm x 16.59 mm 腳位配置指南
PIC16F874-20/L（16.59 mm x 16.59 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： PIC16F874-20/L.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC16F874-20/L 適用於 6 應用s: Industrial Embedded Control, Data Acquisition Controller, Communications Equipment, Instrumentation Front Panel, Motor and Relay Sequencer, Automotive Accessory Controller.
Industrial Embedded Control
The PIC16F874-20/L fits legacy industrial control equipment that needs 33 digital I/O lines, 20 MHz processing, and programmable Flash memory in an established 44-pin PLCC footprint. Its PIC architecture and 35 single-word instructions support responsive state-machine logic for relays, interlocks, actuators, and machine monitoring. I2C, SPI, and UART connectivity allows the controller to communicate with sensors, remote I/O modules, displays, and supervisory equipment. Because the PLCC package is socket-friendly, it can also simplify upgrades to boards built around the original PIC16F874 design.
推薦
Data Acquisition Controller
The PIC16F874-20/L can coordinate a small data-acquisition system by combining 33 I/O pins with a 20 MHz execution rate and integrated I2C, SPI, and UART interfaces. SPI is useful for high-speed sensor and converter connections, while UART can stream measurements to a host computer and I2C can support low-speed sensors and configuration devices. Its 7 KB Flash program space is appropriate for compact acquisition firmware, calibration tables, and communication routines, although front-end signal conditioning remains essential for accurate analog measurements.
推薦
Communications Equipment
The PIC16F874-20/L is suited to protocol conversion and embedded communications modules that need both serial interfaces and a broad set of digital controls. UART handles asynchronous point-to-point links, SPI supports peripheral buses, and I2C connects configuration chips or low-speed transducers. At 20 MHz, the MCU can manage framing, status indicators, timeout handling, and protocol state machines while leaving 33 I/O pins available for indicators, control lines, and service interfaces. The PLCC package is especially helpful for serviceable legacy equipment boards.
推薦
Instrumentation Front Panel
The PIC16F874-20/L can serve as the control processor for an instrumentation front panel with status LEDs, buttons, displays, and service ports. Its 33 I/O pins provide ample digital connections for indicators and input controls, while the 20 MHz clock and 200 ns instruction execution support responsive user-interface updates. UART or SPI can connect a display or external controller, and I2C can be used for configuration or sensor accessories. The 44-pin PLCC package makes the MCU practical for instruments designed around socketed or replaceable controller modules.
推薦
Motor and Relay Sequencer
The PIC16F874-20/L can implement sequencing and interlocking logic for relays, solenoids, lamps, and small motor-control systems. The 20 MHz operating speed provides ample timing margin for debouncing inputs and coordinating multiple outputs, while 33 I/O pins reduce the need for external logic. Flash permits firmware changes during maintenance, and the UART can support diagnostics from a technician or supervisory controller. Suitable power stages, isolation, protection, and suppression components should be added according to the load characteristics.
推薦
Automotive Accessory Controller
The PIC16F874-20/L can be evaluated for accessory and body-control functions that require multiple digital I/O, Flash firmware, and serial diagnostics. I2C, SPI, and UART allow connection to switches, sensors, display modules, and gateway electronics, while the 20 MHz MCU handles debouncing, state management, and fault reporting. Any automotive use requires confirmation of the exact temperature grade, automotive qualification status, transient immunity, and load-dump requirements. A vehicle-specific qualified PIC16F device is generally preferable when those requirements cannot be demonstrated for this ordering code.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16F874-20/L — 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 | PIC16F874-20/P | PIC16F874A-I/L |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (16.59 mm x 16.59 mm) | 44-pin PLCC - verify exact package code | 44-pin PLCC |
| General-Purpose I/O | 33 I/O pins | 33 I/O pins | 33 I/O pins |
| Architecture | 8-bit PIC CMOS Flash | 8-bit PIC CMOS Flash | 8-bit PIC CMOS Flash |
| Communication Interfaces | I2C, SPI, UART | I2C, SPI, UART | I2C, SPI, UART |
主要差異化特點
- Established 20 MHz PIC16F874 platform in a serviceable PLCC package (對比PIC16F874A-I/L)
- Seven communications and control connections support compact peripheral integration (對比PIC16F874-20/P)
- Direct fit for boards designed around the original PIC16F874-20/L order code (對比PIC16F874A-I/L)
設計說明
Use the Microchip Technology package drawing and pin-description table when assigning the 44-pin PLCC footprint. Confirm whether the target board uses a socket or direct PLCC placement, and verify the pin-1 orientation against the board outline. Keep programming, reset, power, and decoupling pins in the layout even when firmware does not initially use every peripheral, because later revisions or recovery operations can depend on those connections.
Follow the exact supply-voltage and decoupling requirements stated in the PIC16F874 datasheet. Place the required input and output bypass capacitors adjacent to their corresponding device pins, with the shortest possible ground return. Use a power source with appropriate startup and transient behavior for the board, and do not infer a 5 V operating point from the MCU family alone because the permitted voltage range is tied to the specific device suffix and operating conditions.
Treat PIC16F874-20/L, PIC16F874-20/P, and PIC16F874A-I/L as different order codes even when their package descriptions appear similar. Before substitution, compare the speed grade, temperature range, memory organization, pin assignment, programming requirements, and errata status. Microchip identifies PIC16F884 as a newer device; moving to it may require firmware, peripheral, and PCB changes rather than a simple component swap.
Route I2C and SPI signals as controlled-impedance PCB traces where applicable, keeping them away from switching nodes and high-current relay or motor paths. Add pull-up resistors to I2C lines according to bus voltage, capacitance, and speed rather than using arbitrary values. For UART connections, provide common ground or the appropriate isolation strategy and account for logic-level thresholds across the connected devices.
合規資訊
The verified product information does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for the exact PIC16F874-20/L order code. Confirm these attributes using the manufacturer product documentation and current supplier declarations.
