PIC16LF74T-I/L - 8-Bit 20MHz MCU, 7KB Flash, 44-PLCC | Microchip
MPN: PIC16LF74T-I/L ✓ Hoạt độngPIC16LF74T-I/L Tóm tắt
What is a PIC16F microcontroller? The PIC16F family is Microchip's mid-range 8-bit RISC microcontroller line, sitting in the broader hierarchy of 8-bit microcontroller -> RISC microcontroller -> embedded MCU -> semiconductor IC. It is widely used in cost-sensitive, low-power embedded designs where deterministic interrupt response, easy in-circuit serial programming (ICSP), and a stable peripheral set matter more than raw CPU throughput.
The LF suffix denotes the extended low-voltage operating range, allowing the PIC16LF74T-I/L to run reliably from 2.0V to 5.5V, which simplifies battery-powered and energy-harvesting designs. Industrial temperature grade (-40C to +85C) and on-chip brown-out reset (BOR), watchdog timer, and power-on reset ensure robust operation in noisy environments. In-system programming via two pins allows firmware updates after PCB assembly, reducing field-service cost.
Typical applications include industrial control, sensor interface boards, low-power remote monitoring nodes, and human-machine interface (HMI) front panels. The 33 I/O pins accommodate multiple pushbuttons, LED indicators, character LCDs, and rotary encoders in a single-chip solution without external glue logic. Five 8-bit I/O ports (PORTA through PORTE) provide flexible mixed-signal routing including analog input channels for direct sensor reading.
When designing with the PIC16LF74T-I/L, ensure decoupling with a 100nF ceramic capacitor placed within 5mm of VDD, and respect the 44-PLCC socket or land pattern dimensions during PCB layout. Note that the PLCC package requires either a PLCC socket for socketing or precise reflow profiling; for tape-and-reel pick-and-place, the 44-PLCC is generally more challenging than QFP packages, so confirm the assembly process capability before finalizing the BOM.
This page synthesizes distributor pricing, drop-in 44-PLCC alternatives (including the QFP-package sibling PIC16LF74T-I/PTG), and practical design notes not consolidated on the manufacturer datasheet or single distributor listings.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF74T-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 PIC16LF74T-I/L (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Core Architecture, Operating Temperature Range.
PIC16LF74-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F74-I/L
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F877A-I/LG
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LF74T-I/L Tỷ lệ tối đa & tính chất điện
| Product Type | 8-bit RISC Microcontroller (MCU) |
| Series | PIC PIC 16F |
| Core | PIC16 |
| Program Memory Size | 7 KB (4K x 14) |
| Program Memory Type | FLASH |
| RAM Size | 192 bytes |
| Maximum CPU Frequency | 20 MHz |
| Operating Voltage Range | 2.5 V / 3.3 V / 5 V |
| Number of I/O Pins | 33 |
| Hộp | 44-PLCC (16.59 x 16.59 mm), J-Lead, Surface Mount |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial, I) |
| ADC | 8-channel 8-bit (per family datasheet) |
| PWM Modules | Capture/Compare/PWM (CCP) modules |
| Serial Interfaces | Synchronous Serial Port (SSP) supporting SPI / I2C, USART |
| Timers | Three 16-bit timers (TMR0, TMR1, TMR2) |
| In-Circuit Programming | ICSP (In-Circuit Serial Programming) |
| Trạng thái RoHS | Compliant |
| Special Features | Brown-out Reset (BOR), Watchdog Timer, Power-on Reset |
Cấu hình chân PIC16LF74T-I/L
| Chân 1 | OSC1/CLKIN — Crystal/ceramic resonator input or external clock input |
| Chân 2 | OSC2/CLKOUT — Crystal output or 1/4 CPU clock output |
| Chân 3 | MCLR — Master Clear (reset) input, programming voltage input |
| Chân 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Chân 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC reference |
| 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 | RE0/RD/AN5 — PORTE bit 0 / Parallel port read / Analog input 5 |
| Chân 11 | RE1/WR/AN6 — PORTE bit 1 / Parallel port write / Analog input 6 |
| Chân 12 | RE2/CS/AN7 — PORTE bit 2 / Parallel port chip select / Analog input 7 |
| Chân 13 | VDD — Positive supply (2.5V - 5.5V) |
| Chân 14 | VSS — Ground reference |
| Chân 15 | OSC1/RC0 — Crystal input (alternate) / PORTC bit 0 |
| Chân 16 | OSC2/RC1 — Crystal output (alternate) / PORTC bit 1 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 output |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply (2.5V - 5.5V) |
| Chân 33 | RB0/INT — PORTB bit 0 / External interrupt 0 |
| Chân 34 | RB1 — PORTB bit 1 |
| Chân 35 | RB2 — PORTB bit 2 |
| Chân 36 | RB3/PGM — PORTB bit 3 / Low-voltage programming input |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| Chân 41 | NC — Not connected (per PLCC pinout) |
| Chân 42 | NC — Not connected (per PLCC pinout) |
| Chân 43 | NC — Not connected (per PLCC pinout) |
| Chân 44 | NC — Not connected (per PLCC pinout) |
Ứng dụng tiêu biểu
PIC16LF74T-I/L phù hợp cho 7 Áp dụngs: Industrial Control & Sensor Interface Boards, Low-Power Remote Monitoring Nodes, Human-Machine Interface (HMI) Front Panels, Educational & Hobby Microcontroller Kits, Automotive Aftermarket & Telematics, Legacy System Maintenance & Repair, Motor Control & PWM Driver Boards.
Industrial Control & Sensor Interface Boards
The PIC16LF74T-I/L fits industrial sensor interface boards where 33 I/O pins, on-chip ADC, and 2.5V-5.5V supply tolerance matter. With 7KB Flash and 192B RAM, it reads up to 8 analog sensors via PORTA ADC channels while driving status LEDs, optocouplers, and a UART-linked PLC backplane. The -40C to +85C industrial grade handles factory-floor temperature swings, and ICSP lets the factory or service tech reprogram the unit without desoldering. Compared to discrete logic plus a separate ADC IC, this single-chip MCU cuts BOM cost by ~30% and PCB area by ~50%.
Được đề xuất
Low-Power Remote Monitoring Nodes
Battery-powered remote monitoring nodes leverage the LF suffix's 2.0V-5.5V supply range to run directly from 2x AA cells or a single Li-ion pack without boost regulation. The 20MHz PIC16F core wakes periodically, reads a sensor via the on-chip ADC, transmits over the USART or SSP, then returns to sleep. Brown-out reset protects against weak cells, and the watchdog timer guards against code lockup in unattended installations. The 44-PLCC allows field-replaceable servicing - swap a node in 10 seconds instead of desoldering.
Được đề xuất
Human-Machine Interface (HMI) Front Panels
HMI front panels with character LCDs, 7-segment displays, keypads, and rotary encoders benefit from the PIC16LF74T-I/L's 33 I/O pins: enough to drive a 16x2 character LCD in 4-bit mode while scanning a 4x4 matrix keypad and reading two encoder channels. The CCP modules generate PWM for backlight dimming, and the SSP talks to an external SPI EEPROM for menu storage. The 44-PLCC package accommodates test sockets during manufacturing and field replacement of legacy panels.
Được đề xuất
Educational & Hobby Microcontroller Kits
The PIC16LF74T-I/L remains a teaching favorite because it packs enough peripherals (ADC, PWM, SPI, I2C, USART) into a single 44-pin chip to support comprehensive assembly and C programming exercises. Universities and makers appreciate the 44-PLCC's through-hole-socket compatibility - beginners can plug the chip into a breadboard adapter and swap it without soldering. ICSP support lets instructors flash firmware updates during lab sessions. The mature, free MPLAB X IDE and XC8 compiler toolchain shorten the learning curve.
Được đề xuất
Automotive Aftermarket & Telematics
Although not AEC-Q100 qualified, the PIC16LF74T-I/L serves in non-safety automotive aftermarket modules such as OBD-II adapters, GPS telematics loggers, and lighting controllers where the industrial -40C to +85C range, brown-out protection, and watchdog timer meet under-hood or cabin requirements. Its 33 I/O pins handle multiple sensor inputs (temperature, voltage, RPM), and the USART bridges to GSM/Bluetooth/GPS modules. For OEM automotive designs requiring AEC-Q100, use the PIC16LF74T-I/PT automotive variant instead.
Được đề xuất
Legacy System Maintenance & Repair
The PIC16LF74T-I/L keeps decades-old PIC16F7X-based industrial systems running without requiring PCB redesigns. With identical 44-PLCC pinout and PIC16F74 silicon, it serves as a verified maintenance replacement for end-of-life assemblies where a system redesign is uneconomical. Distributors maintain pipeline stock because the part is still actively produced, simplifying MRO procurement. For discontinued predecessors like the PIC16C74, it is a functional upgrade to Flash-based in-circuit reprogrammable memory.
Được đề xuất
Motor Control & PWM Driver Boards
The PIC16LF74T-I/L's two CCP modules generate complementary PWM signals for DC motor and small stepper motor control, while the 8-channel ADC reads current-sense shunts and tachometer feedback. Its 20MHz clock supports PWM frequencies up to ~78kHz (8-bit resolution) or ~19kHz (10-bit resolution), sufficient for brushed DC and unipolar stepper drivers. The 33 I/O pins accommodate direction logic, brake control, fault inputs, and encoder feedback. Add an external gate driver for higher-current MOSFET/IGBT switching.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF74T-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 | PIC16LF74-I/L | PIC16F74-I/L | PIC16F877A-I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59x16.59) | 44-PLCC (16.59x16.59) - same | 44-PLCC (16.59x16.59) - same | 44-PLCC (16.59x16.59) - same |
| Program Memory (Flash) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 14 KB (8K x 14) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| Maximum Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage Range | 2.5V - 5.5V (LF) | 2.5V - 5.5V (LF) | 4.5V - 5.5V (non-LF) | 2.0V - 5.5V |
| Number of I/O Pins | 33 | 33 | 33 | 33 |
| ADC Resolution | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 10-bit, 8 channels |
| Packaging | Tape & Reel | Tube | Tube | Tube |
| 1-Piece Price (USD, as of 2026-09-25) | $6.42 | ~$6.20 | ~$5.85 | ~$7.40 |
Bảo phân biệt quan trọng
- Wider operating voltage range than the legacy PIC16F74 (vsPIC16F74-I/L)
- Same 44-PLCC footprint, doubled memory with PIC16F877A upgrade (vsPIC16F877A-I/L)
- Tape-and-reel packaging variant for SMT assembly (vsPIC16LF74-I/L)
Ghi chú thiết kế
Place a 100 nF (0.1 uF) ceramic decoupling capacitor within 5 mm of every VDD pin (pin 13 and pin 32 on the 44-PLCC); add a bulk 10 uF tantalum or aluminum capacitor on the main VDD rail. The PIC16LF74T-I/L has two VDD pins to reduce supply noise; never connect only one. For battery-powered designs, route the BOR threshold configuration bits to match the battery end-of-discharge voltage to avoid spurious resets.
The 44-PLCC J-lead package requires a 44-PLCC SMT land pattern with proper pad geometry (typically 1.0 mm x 2.0 mm pads on 1.27 mm pitch). Keep-out zones around the chip body must accommodate the plastic body overhang. For prototype/swap-friendly designs, use a 44-PLCC through-hole socket (e.g., 3M 8444 series) - this allows field replacement and avoids PLCC reflow soldering, which has a steeper learning curve than QFP.
Estimated: at 20MHz with 5.0V supply, active current is ~13 mA per the datasheet DC characteristics; at 3.3V it drops to ~5 mA. Sleep current is below 1 uA typical, so wake-on-interrupt designs should confirm Sleep-mode wake latency (4 Tosc + wake-up delay) is acceptable. Watch out for the parallel slave port (PSP) on PORTE/RE0-RE2 - if unused, set TRISE bits to make them inputs and tie to a defined level to avoid floating-pin noise on ADC channels AN5-AN7.
Keep the crystal or external clock traces (OSC1/OSC2) short and routed away from high-noise traces such as PWM outputs and ADC inputs. Place a guard trace around the crystal traces to ground if PCB density allows. When using the internal RC oscillator instead, OSC1/OSC2 pins can be reassigned as RA7/RA6 general-purpose I/O (varies by configuration), freeing two extra pins but losing crystal accuracy - acceptable for UART baud rates up to 9600 but not for precise timing.
The PIC16LF74T-I/L's ADC is unipolar and shares its sample-and-hold capacitance with the analog input pin. Add a source impedance under 10 kohm (preferably under 2.5 kohm) and a 100 nF bypass on each analog input for accurate conversions at 20MHz. Switching large loads (relays, motors) on adjacent digital pins can inject noise - add a small RC filter (1 kohm + 100 nF) on sensitive analog channels.
Thông tin tuân thủ
RoHS and lead-free per Microchip product page; not AEC-Q100 qualified - use PIC16LF74T-I/PT automotive variant for OEM automotive applications. Halogen-free status not explicitly stated in available web data - marked unknown.
