PIC16LF874AT-I/L - 8-Bit Flash MCU, 7KB, 44-Pin PLCC | Microchip
MPN： PIC16LF874AT-I/L ✓ 啟用中PIC16LF874AT-I/L 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and a configurable set of peripherals such as timers, communications interfaces, and analog-to-digital converters. The PIC16 family sits in Microchip's 8-bit mid-range architecture hierarchy: PIC10/PIC12/PIC16/PIC18 microcontrollers -> 8-bit MCU -> microcontroller -> embedded processing -> semiconductor. The 'LF' prefix designates a wide-voltage (2.0 V to 5.5 V) low-power process technology, making these parts ideal for battery-powered and energy-constrained designs.
Key features of the PIC16LF874AT-I/L include 7 KB of self-programmable FLASH program memory, 192 bytes of data RAM, 256 bytes of EEPROM, a 14-bit instruction word, and a 10 MHz maximum oscillator frequency (5V operation). The integrated peripherals list 8 channels of 10-bit A/D conversion, a USART, MSSP supporting both SPI and I2C (master/slave), two capture/compare/PWM modules, a watchdog timer with its own on-chip RC oscillator, and an 8-bit parallel slave port for external memory expansion.
The architecture combines a 14-bit-wide instruction set with a hardware stack of 16 levels and 35 single-word instructions, providing deterministic interrupt latency and high code density relative to 8-bit byte-oriented cores. The 'LF' process supports the full 2.0 V to 5.5 V operating window, enabling designs that migrate between 3.3 V and 5 V rails without re-spinning firmware. The 44-pin PLCC package provides generous I/O count and supports in-circuit serial programming (ICSP) via RB6/RB7.
Typical applications include industrial sensor conditioning nodes, HVAC controllers, automotive body-electronics subsystems, instrumentation front-ends, and consumer white-goods control boards where a balance of peripheral integration, low power draw, and field-upgradable FLASH is required. Designers migrating from older 5V PIC16C/16F designs gain an immediate advantage in active current draw without losing code compatibility.
When designing with this MCU, allocate RB6 and RB7 as ICSP pins (do not use them as general-purpose I/O) and provide a decoupling capacitor of 100 nF adjacent to every VDD/VSS pair. For low-power applications, switch the oscillator to LFINTOSC (31 kHz) and use the watchdog timer as the wake-up source to minimize sleep current.
This page synthesizes verified distributor pricing, schematic-package-correct drop-in alternatives, and practical design notes not found standalone in the manufacturer datasheet.
直接替換替代品，適用於 PIC16LF874AT-I/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： PIC16LF874AT-I/L （相同外形與佔位） — 差異在於 Core Architecture, Mounting Type, Program Memory Size, ADC, Communication Interfaces.
PIC16LF874A-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16F874AT-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF874AT-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF877AT-I/L
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16F873AT-I/L
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16LF874-04I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF874AT-I/L 最大額定值與電氣特性
| Product Family | PIC16 (Mid-Range 8-bit) |
| Core Architecture | 8-bit RISC |
| Program Memory (FLASH) | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| Data EEPROM | 256 bytes |
| Instruction Set | 35 single-word instructions, 14-bit wide |
| 最大時脈頻率 | 10 MHz at 5V (20 MHz at 5V for PIC16F874A) |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 33 (estimate from 44-pin PLCC allocation) |
| A/D Converter | 8 channels x 10-bit |
| Communication Interfaces | USART + MSSP (SPI / I2C) |
| PWM Modules | 2 (CCP) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Package Type | 44-pin PLCC (J-Lead), code 'L' |
| Temperature Grade | Industrial (-40C to +85C) |
| 安裝類型 | Surface Mount (PLCC socket compatible) |
| ICSP Programming | In-Circuit Serial Programming (RB6/RB7) |
PIC16LF874AT-I/L 腳位配置
| 腳位 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / PORTE bit 3 |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / A/D channel 0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / A/D channel 1 |
| 腳位 4 | RA2/AN2 — PORTA bit 2 / A/D channel 2 |
| 腳位 5 | RA3/AN3/VREF+ — PORTA bit 3 / A/D channel 3 / A/D reference positive |
| 腳位 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input (open-drain) |
| 腳位 7 | RA5/AN4/SS — PORTA bit 5 / A/D channel 4 / SPI slave select |
| 腳位 8 | VSS — Ground reference |
| 腳位 9 | OSC1/CLKI — Crystal oscillator input / external clock input |
| 腳位 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| 腳位 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| 腳位 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| 腳位 13 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| 腳位 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 腳位 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 腳位 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| 腳位 17 | RC6/TX/CK — PORTC bit 6 / USART asynchronous transmit / synchronous clock |
| 腳位 18 | RC7/RX/DT — PORTC bit 7 / USART asynchronous receive / synchronous data |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply voltage |
| 腳位 21 | RB0/INT — PORTB bit 0 / external interrupt |
| 腳位 22 | RB1 — PORTB bit 1 |
| 腳位 23 | RB2 — PORTB bit 2 |
| 腳位 24 | RB3/PGM — PORTB bit 3 / LVP enable |
| 腳位 25 | RB4 — PORTB bit 4 |
| 腳位 26 | RB5 — PORTB bit 5 |
| 腳位 27 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| 腳位 28 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| 腳位 29 | VSS — Ground reference |
| 腳位 30 | VDD — Positive supply voltage |
| 腳位 31 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| 腳位 32 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| 腳位 33 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| 腳位 34 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 腳位 35 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| 腳位 36 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| 腳位 37 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| 腳位 38 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| 腳位 39 | VSS — Ground reference |
| 腳位 40 | VDD — Positive supply voltage |
| 腳位 41 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| 腳位 42 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
| 腳位 43 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip select |
| 腳位 44 | NC — No internal connection on the 40-pin legacy PIC16 footprint; reserved on PLCC-44 |
典型應用
PIC16LF874AT-I/L 適用於 6 應用s: Industrial Sensor Conditioning Node, HVAC Zone Controller, Consumer White-Goods Control Board, Automotive Body-Electronics Subsystems, Portable Data-Acquisition Front End, Educational / Maker Embedded Platform.
Industrial Sensor Conditioning Node
The PIC16LF874AT-I/L fits industrial 4-20 mA sensor hubs because its 2.0 V to 5.5 V operating range accommodates common 3.3 V and 5 V field rails while drawing only ~1.6 mA active at 4 MHz. The integrated 8-channel 10-bit ADC multiplexes thermocouple, pressure, and level sensors into one chip, and the on-chip USART streams scaled readings to a PLC. Full FLASH self-programmability allows remote firmware updates in hazardous locations where physical access is restricted.
推薦
HVAC Zone Controller
The PIC16LF874AT-I/L is well-matched to HVAC multizone thermostats because its low-power 'LF' silicon enables indefinite battery backup, while the dual Capture/Compare/PWM (CCP) modules generate servo and triac control signals for dampers and stages of heating. The 8-bit core supplies more than enough MIPS for PID loops running at 1 Hz, and the MSSP peripheral drives an SPI-connected LCD driver without external glue logic. Watchdog timer and brown-out reset improve field reliability in electrically noisy mechanical closets.
推薦
Consumer White-Goods Control Board
The PIC16LF874AT-I/L drives dishwasher, washing machine, and induction-cooktop user-interface boards where price-sensitive 8-bit processing suffices. Its 7 KB FLASH supports full appliance state machines plus UI handling, and the 256-byte EEPROM stores configurable wash cycles without battery backup. Industrial temperature grade covers operation inside a hot appliance cavity, while the 44-pin PLCC socket option simplifies factory rework during product ramps.
推薦
Automotive Body-Electronics Subsystems
The PIC16LF874AT-I/L serves automotive body controllers for seat adjustment, mirror folding, and lighting where a wide supply voltage (2.0 V to 5.5 V) tolerates cranking transients down to 6 V on the 12 V rail. With the industrial temperature grade, it covers cabin-mounted modules from -40 C to +85 C; for under-hood electronics above +85 C designers should use the AEC-Q100 qualified PIC16F874A-I/PT automotive part. The 7 KB FLASH holds multiple seat-position presets and diagnostic routines.
推薦
Portable Data-Acquisition Front End
The PIC16LF874AT-I/L fits handheld data loggers because the 'LF' process delivers multi-day battery life when the 31 kHz LFINTOSC drives the MCU between ADC bursts. The 10-bit ADC acquires at 50 ksps, and the 7 KB FLASH buffers trigger logic for unattended field deployments. The 44-pin PLCC allows hobbyist reprogramming in a socket without soldering, useful for research and lab prototyping of monitoring instruments.
推薦
Educational / Maker Embedded Platform
The PIC16LF874AT-I/L is a strong teaching platform for university embedded courses because it combines a deterministic RISC architecture, ICSP in-circuit programming, and a manageable 35-instruction set. The 44-pin PLCC socket simplifies student board debugging, and 7 KB FLASH is enough for full real-time OS demonstrations or custom bootloaders. Compatibility with the MPLAB XC8 toolchain and PICkit 3/4 programmers keeps the educational lab cost low while preserving an upgrade path to PIC18 and dsPIC parts.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16LF874AT-I/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 | PIC16LF874A-I/L | PIC16F874AT-I/L | PIC16LF874AT-I/PT | PIC16LF877AT-I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PLCC-44 (L) | PLCC-44 (L) - same | PLCC-44 (L) - same | TQFP-44 (PT) - same die, different lead style | PLCC-44 (L) - same |
| FLASH Memory | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 14 KB (8K x 14) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Maximum Frequency | 10 MHz (5V) | 10 MHz (5V) | 20 MHz (5V) | 10 MHz (5V) | 10 MHz (5V) |
| A/D Converter | 8 ch x 10-bit | 8 ch x 10-bit | 8 ch x 10-bit | 8 ch x 10-bit | 8 ch x 10-bit |
| Communication Peripherals | USART + SPI/I2C | USART + SPI/I2C | USART + SPI/I2C | USART + SPI/I2C | USART + SPI/I2C |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) |
主要差異化特點
- Wide-voltage LF process (對比PIC16F874AT-I/L)
- PLCC socket compatibility (對比PIC16LF874AT-I/PT)
- Compact 7 KB FLASH for cost-down (對比PIC16LF877AT-I/L)
設計說明
Place a 100 nF decoupling capacitor on every active VDD/VSS pair (pins 11/12, 19/20, 29/30, 39/40) within 5 mm of the package leads using short, wide traces. Add a bulk 10 uF tantalum or polymer capacitor close to pin 12 (VDD1) to absorb digital supply transients during A/D bursts. For best ADC accuracy, isolate the AVdd reference routing from high-current digital VDD traces per Microchip PIC16F87x family layout guidelines.
Reserve RB6 (pin 27) and RB7 (pin 28) as ICSP clock/data - never use them as outputs driving heavy loads, because the PICkit programmer requires them to be high-impedance during programming. Configure the LVP bit (RB3/PGM, pin 24) appropriately before code lock to avoid unintentionally enabling low-voltage programming. The MCLR pin (pin 1) needs a 10 kohm pull-up to VDD for normal operation; floating MCLR causes intermittent resets.
Estimated: at full 20 MHz active operation with all peripherals enabled the part dissipates approximately 50 mW (5V x 10 mA), well within PLCC-44 theta_JA of approximately 45 C/W. Junction temperature rise above ambient stays under 3 C in normal mounting. No heatsink is required; however, board designers in sealed enclosures should still verify with a thermal probe under worst-case ambient to avoid derating surprises.
合規資訊
PLCC-44 ('L') packages are commonly Pb-bearing socket-compatible variants. RoHS, MSL, and lead-free status are marked [DATA_NEEDED] in the specs and should be verified against the reel CoC before RoHS-strict production. For AEC-Q100 automotive qualification, select PIC16F874A-I/PT, which is in the same silicon family.
