PIC16LF874AT-I/L - 8-Bit Flash MCU, 7KB, 44-Pin PLCC | Microchip
MPN: PIC16LF874AT-I/L ✓ Hoạt độngPIC16LF874AT-I/L Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF874AT-I/L — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16LF874AT-I/L (cùng hình factor và footprint) — khác nhau ở Core Architecture, Mounting Type, Program Memory Size, ADC, Communication Interfaces.
PIC16LF874A-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874AT-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF874AT-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877AT-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F873AT-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LF874-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF874AT-I/L Tỷ lệ tối đa & tính chất điện
| 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 |
| Tần số xung maksimum | 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) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
| ICSP Programming | In-Circuit Serial Programming (RB6/RB7) |
Cấu hình chân PIC16LF874AT-I/L
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / PORTE bit 3 |
| Chân 2 | RA0/AN0 — PORTA bit 0 / A/D channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / A/D channel 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / A/D channel 2 |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / A/D channel 3 / A/D reference positive |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input (open-drain) |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / A/D channel 4 / SPI slave select |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKI — Crystal oscillator input / external clock input |
| Chân 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Chân 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / USART asynchronous transmit / synchronous clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / USART asynchronous receive / synchronous data |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 22 | RB1 — PORTB bit 1 |
| Chân 23 | RB2 — PORTB bit 2 |
| Chân 24 | RB3/PGM — PORTB bit 3 / LVP enable |
| Chân 25 | RB4 — PORTB bit 4 |
| Chân 26 | RB5 — PORTB bit 5 |
| Chân 27 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| Chân 28 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| Chân 29 | VSS — Ground reference |
| Chân 30 | VDD — Positive supply voltage |
| Chân 31 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Chân 32 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Chân 33 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Chân 34 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Chân 35 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Chân 36 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Chân 37 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Chân 38 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Chân 39 | VSS — Ground reference |
| Chân 40 | VDD — Positive supply voltage |
| Chân 41 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| Chân 42 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
| Chân 43 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip select |
| Chân 44 | NC — No internal connection on the 40-pin legacy PIC16 footprint; reserved on PLCC-44 |
Ứng dụng tiêu biểu
PIC16LF874AT-I/L phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF874AT-I/L — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Wide-voltage LF process (vsPIC16F874AT-I/L)
- PLCC socket compatibility (vsPIC16LF874AT-I/PT)
- Compact 7 KB FLASH for cost-down (vsPIC16LF877AT-I/L)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
