PIC16LF874A-I/L - 8-bit PIC MCU, 7KB Flash, 10MHz, 44-PLCC | Microchip
MPN: PIC16LF874A-I/L ✓ Hoạt độngPIC16LF874A-I/L Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and programmable I/O peripherals. The PIC16LF874A belongs to the PIC16F family of microcontrollers, which sit in the broader hierarchy of microcontroller -> embedded controller -> semiconductor device. The 'LF' prefix designates low-voltage operation, suitable for battery-powered and portable designs. The 'F' indicates FLASH-based program memory, enabling in-circuit reprogramming via ICSP.
Key features of the PIC16LF874A-I/L include the enhanced 14-bit instruction set of the PIC16 architecture, integrated peripherals such as multiple timers, a 10-bit ADC, USART, MSSP (SPI/I2C), and capture/compare/PWM modules. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debugger (ICD) interfaces, allowing field firmware updates and development without removing the chip from the PCB.
The PIC16LF874A-I/L is fabricated using CMOS technology for low power consumption and operates over the industrial temperature range (-40C to +85C). Its Harvard architecture with separate program and data buses enables deterministic instruction execution, ideal for real-time control applications. The 44-PLCC package provides robust through-hole mounting with a socket-replaceable form factor, useful for prototyping and legacy designs.
Typical applications include industrial control systems, automotive subsystems, sensor interface modules, home appliance controls, and battery-powered instrumentation. The combination of FLASH memory, integrated ADC, and USART makes this MCU a strong fit for embedded data acquisition nodes.
When designing with the PIC16LF874A-I/L, ensure decoupling capacitors (0.1uF ceramic) are placed near each power pin. Verify the supply voltage stays within the LF family range, and use MPLAB X IDE with a compatible compiler (XC8) for firmware development. The device date-of-introduction is 1998-12-01, indicating it is a long-established part.
This page synthesizes distributor pricing, drop-in equivalents, and practical design notes not found in the standalone manufacturer datasheet, helping engineers and procurement teams evaluate this Microchip MCU for new and legacy designs.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF874A-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 PIC16LF874A-I/L (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Mounting Type, ADC, Maximum Clock Frequency.
PIC16F874A-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877A-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877A-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF74-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF874-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF874A-I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC16 RISC |
| Program Memory Type | FLASH |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM Size | 192 bytes |
| Tần số xung maksimum | 10 MHz |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 33 |
| Package Type | 44-pin PLCC (16.59 x 16.59 mm) |
| Kiểu lắp đặt | Surface Mount / Through-Hole Socket |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Process Technology | CMOS |
| Instruction Set | 14-bit enhanced PIC16 |
| ADC | 10-bit (integrated) |
| Communication Interfaces | USART, MSSP (SPI/I2C) |
| ICSP Support | Yes (In-Circuit Serial Programming) |
| Date of Introduction | 1998-12-01 |
Cấu hình chân PIC16LF874A-I/L
| Chân 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Chân 2 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 3 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 6 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC reference minus |
| Chân 7 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC reference plus |
| Chân 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 9 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Chân 10 | VSS — Ground reference |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 13 | RB1 — PORTB bit 1 |
| Chân 14 | RB2 — PORTB bit 2 |
| Chân 15 | RB3/PGM — PORTB bit 3 / ICSP programming |
| Chân 16 | RB4 — PORTB bit 4 |
| Chân 17 | RB5 — PORTB bit 5 |
| Chân 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 20 | VSS — Ground reference |
| Chân 21 | VDD — Positive supply voltage |
| Chân 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 24 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Chân 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 28 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 29 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 30 | VSS — Ground reference |
| Chân 31 | VDD — Positive supply voltage |
| Chân 32 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port data 0 |
| Chân 33 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port data 1 |
| Chân 34 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port data 2 |
| Chân 35 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port data 3 |
| Chân 36 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port data 4 |
| Chân 37 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port data 5 |
| Chân 38 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port data 6 |
| Chân 39 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port data 7 |
| Chân 40 | VSS — Ground reference |
| Chân 41 | VDD — Positive supply voltage |
| Chân 42 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Chân 43 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Chân 44 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Ứng dụng tiêu biểu
PIC16LF874A-I/L phù hợp cho 6 Áp dụngs: Industrial Control Systems, Automotive Body and Subsystem Modules, Battery-Powered Sensor Nodes, Home Appliance Controls, Data Acquisition and Instrumentation, Legacy Embedded System Maintenance.
Industrial Control Systems
The PIC16LF874A-I/L fits industrial control applications because its 8-bit PIC16 architecture provides deterministic instruction execution needed for real-time control loops. With 33 I/O pins, integrated 10-bit ADC, and USART, it interfaces directly with sensors, actuators, and HMI panels. The 2.0-5.5V supply range allows operation from 24V industrial buses via simple LDO regulation. The industrial temperature rating (-40C to +85C) ensures reliability in factory environments. Unlike larger 32-bit MCUs, this part keeps BOM cost low for distributed I/O nodes, motor control peripherals, and PLC expansion modules where deterministic timing matters more than raw compute.
Được đề xuất
Automotive Body and Subsystem Modules
The PIC16LF874A-I/L is suitable for non-safety automotive subsystems such as body controllers, lighting modules, seat controls, and HVAC actuators. Its 8-bit RISC core delivers predictable interrupt response for timer-driven tasks like PWM dimming and switch debouncing. The 33 I/O pins handle multiple relay drivers and switch inputs without external muxing. The 44-PLCC package supports socketed replacement in legacy automotive ECUs. The wide supply range (2.0-5.5V) tolerates 12V battery transients when paired with proper TVS protection. Note: this part is NOT AEC-Q100 qualified; for safety-critical or under-hood automotive designs, select a Q-graded PIC16 variant.
Được đề xuất
Battery-Powered Sensor Nodes
The PIC16LF874A-I/L is well matched to battery-powered wireless sensor nodes because its LF voltage operation (2.0V minimum) lets it run directly from 2x AA alkaline cells (3V nominal) without an LDO. The integrated 10-bit ADC reads analog sensors like thermistors, photodiodes, and bridge pressure sensors without external components. CMOS low-power design plus PIC16 sleep modes (nanowatt standby) extend battery life to years in duty-cycled applications. The 33 I/O pins accommodate SPI sensors, I2C peripherals, and an external radio module. Combined with 7KB FLASH, it has space for application firmware plus a wireless protocol stack fragment.
Được đề xuất
Home Appliance Controls
The PIC16LF874A-I/L powers cost-sensitive home appliance control boards in washing machines, microwave ovens, dishwashers, and HVAC thermostats. Its 33 I/O pins interface with keypads, LED/LCD displays, relay drivers, and triac optocouplers for AC load control. The integrated PWM modules drive motor speed control for fans and pumps. FLASH memory allows field firmware updates via ICSP, reducing service costs. The 2.0-5.5V supply range works with both 3.3V and 5V designs. The 44-PLCC package is socket-friendly, simplifying factory programming and field service.
Được đề xuất
Data Acquisition and Instrumentation
The PIC16LF874A-I/L serves as a low-cost data acquisition front-end for laboratory instruments, environmental monitors, and test fixtures. Its integrated 10-bit ADC (up to 8 channels) captures sensor data with adequate resolution for non-precision measurements. The USART interfaces with RS-232/RS-485 transceivers for wired data logging to PCs or PLCs. The 192-byte RAM supports modest buffering before transmission. The MSSP peripheral operates as SPI or I2C master to external ADC, DAC, or EEPROM ICs. Industrial temperature range ensures stable operation in field-deployed instrumentation enclosures.
Được đề xuất
Legacy Embedded System Maintenance
The PIC16LF874A-I/L is ideal for maintaining and replicating legacy embedded designs originally built in the late 1990s and 2000s. Its 44-PLCC package matches the original footprint, allowing direct PCB replacement without redesign. The mature PIC16 toolchain (MPLAB X IDE, XC8 compiler) ensures existing firmware sources compile with minimal changes. The ICSP interface permits field firmware updates without removing the chip from the board. Long-life-cycle status and continued production by Microchip protect against obsolescence for industrial systems with 10-20 year deployment horizons. This is a critical drop-in for maintaining installed-base equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF874A-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 | PIC16F874A-I/L | PIC16LF877A-I/L | PIC16F877A-I/L | PIC16LF74-I/L | PIC16LF874-04I/L |
|---|---|---|---|---|---|---|
| Package | 44-PLCC | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) | 44-PLCC (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (FLASH) | 7 KB | 7 KB (same) | 14 KB (+100%) | 14 KB (+100%) | 7 KB (same) | 7 KB (same) |
| Data RAM | 192 bytes | 192 bytes (same) | 368 bytes (+92%) | 368 bytes (+92%) | 192 bytes (same) | 192 bytes (same) |
| Max Clock Frequency | 10 MHz | 10 MHz (same) | 10 MHz (same) | 10 MHz (same) | 10 MHz (same) | 4 MHz (-60%) |
| Supply Voltage Range | 2.0 V to 5.5 V | 4.0 V to 5.5 V (no low-voltage 2V) | 2.0 V to 5.5 V (same) | 4.0 V to 5.5 V (no low-voltage 2V) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) |
| I/O Pins | 33 | 33 (same) | 33 (same) | 33 (same) | 33 (same) | 33 (same) |
| ADC Resolution | 10-bit | 10-bit (same) | 10-bit (same) | 10-bit (same) | 8-bit (lower) | 10-bit (same) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) |
Bảo phân biệt quan trọng
- Drop-in low-voltage 2V operation for battery-powered designs (vsPIC16F874A-I/L)
- Doubled FLASH and RAM for larger firmware (vsPIC16LF877A-I/L)
- Cost-optimized 7KB memory tier (vsPIC16F877A-I/L)
Ghi chú thiết kế
Estimated: At 10 MHz clock and 5V supply, the PIC16LF874A-I/L typical operating current is approximately 2-5 mA depending on peripherals enabled. Place a 0.1uF ceramic decoupling capacitor as close as possible to each VDD pin (pins 11, 21, 31, 41). For battery-powered designs below 3.3V, the LF variant is essential - using the F variant will brown-out below 4V. Add a bulk 10uF tantalum or aluminum capacitor on the supply rail for transient robustness.
The 44-PLCC package requires a PLCC socket (e.g., 3M 8440-7B1-RK-TU or similar) for socketed designs. Keep traces to the crystal (OSC1/OSC2) short (<10 mm) and route them away from high-current switching signals to minimize EMI coupling. The MCLR pin requires a 10k pull-up to VDD; add a 100nF capacitor to ground for noise filtering. ICSP signals (RB6/PGC, RB7/PGD) should be brought to a header for in-circuit programming without removing the MCU.
Do not exceed 5.5V on any VDD pin or damage will occur - the LF variant extends the lower range but does not raise the upper limit. The MCLR pin is NOT internally pulled high on this device; external pull-up is mandatory. When migrating code from PIC16F874A to PIC16LF874A, verify oscillator configuration bits match the lower Vdd range. Configuration word settings (oscillator, watchdog, brown-out, code protection) must be set correctly before code will execute - tools like MPLAB X with XC8 compiler enforce this.
Route the analog inputs (RA0-RA5, RE0-RE2) with guard traces or keep them short to minimize digital switching noise coupling into ADC readings. If using the ADC, decouple VREF+ (pin 7) with 0.1uF + 10uF capacitors to VREF- (pin 6). For noise-sensitive designs, place a ground plane under the analog section only, not splitting it across the digital section. The 44-PLCC lead frame can be challenging to route on 2-layer boards; consider a 4-layer stack-up with dedicated ground and power planes.
Thông tin tuân thủ
RoHS/REACH/lead-free status not confirmed in verified web data; check Microchip product page or PCN for compliance certificates. Part is NOT AEC-Q100 qualified - for safety-critical automotive, select a Q-graded PIC16 variant.
