PIC16F874-20/L - 20MHz 8-Bit Flash MCU | Microchip
부품 번호: PIC16F874-20/L ✗ 단종PIC16F874-20/L 개요
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.
드롭인 대체품: PIC16F874-20/L — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PIC16F874-20/L (동일 폼 팩터 및 풋프린트) — 차이점: Package, ADC, Timers, Instruction Cycle Time, Mounting Type.
PIC16F874-20/P
✅ 드롭인가격 문의
데이터시트 보기 →PIC16F874A-I/L
✅ 드롭인가격 문의
데이터시트 보기 →PIC16F874-20/L 최대 정격 & 전기적 특성
| Device Type | 8-bit CMOS Flash microcontroller |
| 최대 클록 주파수 | 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 |
| 패키지 | 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 |
| 실장 유형 | Surface mount |
| Package Body Size | 16.59 mm x 16.59 mm |
PIC16F874-20/L 16.59 mm x 16.59 mm 핀 구성 가이드
PIC16F874-20/L(16.59 mm x 16.59 mm 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: PIC16F874-20/L.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
PIC16F874-20/L 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: PIC16F874-20/L — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Established 20 MHz PIC16F874 platform in a serviceable PLCC package (vs PIC16F874A-I/L)
- Seven communications and control connections support compact peripheral integration (vs PIC16F874-20/P)
- Direct fit for boards designed around the original PIC16F874-20/L order code (vs PIC16F874A-I/L)
설계 노트
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.
규정 준수 정보
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.
