PIC16LF74-I/ML - 8-Bit PIC MCU, 7KB Flash, 33 I/O | Microchip
MPN: PIC16LF74-I/ML ✓ Hoạt độngPIC16LF74-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and a set of peripherals such as timers, communication ports and ADCs. The PIC16F family is the classic 8-bit mid-range line from Microchip, sitting between the baseline PIC10/12/16 and the high-performance PIC18/PIC24 families. The 'LF' suffix designates the low-voltage process, allowing VDD operation down to 2.0 V typical for battery-powered applications, while the 'F' indicates Flash program memory that can be reprogrammed in-circuit via ICSP.
Key features include 7 KB Flash program memory, 192 bytes SRAM, hardware USART, MSSP (SPI/I2C) port, two 8-bit timers with capture/compare, one 16-bit timer/counter, 8-channel 8-bit ADC, dual analog comparators and a watchdog timer with on-chip low-power RC oscillator. The PIC16LF74 also supports in-circuit serial programming (ICSP), enabling field firmware updates via two pins. Its nanopower techniques and wide voltage range make it well suited to portable and energy-harvesting designs.
Typical applications include industrial control panels, sensor signal conditioning, battery-powered instrumentation, automotive body electronics (non-safety), and consumer appliance controllers. The 33 I/O and high-resolution peripherals simplify designs that require many push-buttons, LEDs and analog inputs without an external I/O expander.
Design tip: when migrating to PIC16LF74, place the ICSP VPP/VDD pair, the MCLR pull-up resistor, and the 33 I/O ESD protection close to the IC. The 44-pin QFN has an exposed thermal pad that must be soldered to the ground plane for electrical and thermal performance. This page synthesizes drop-in alternatives, parametric comparisons, and design notes that complement the Microchip datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF74-I/ML — 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 PIC16LF74-I/ML (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Core Architecture, I/O Pins.
PIC16LF74-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF747-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF727-I/MV
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF722-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LF737T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF74-I/ML Tỷ lệ tối đa & tính chất điện
| Core | PIC16 8-bit RISC |
| Instruction Set | 14-bit, 35 instructions |
| Program Memory (Flash) | 7 KB (4K x 14) |
| RAM | 192 bytes |
| Maximum CPU Speed | 20 MHz |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit |
| Timers | 2x 8-bit + 1x 16-bit |
| Capture/Compare/PWM | Yes (CCP) |
| Communication | USART, MSSP (SPI/I2C) |
| Analog Comparators | 2 |
| Watchdog Timer | Yes (WDT) |
| ICSP (In-Circuit Serial Programming) | Yes |
| Hộp | 44-pin QFN with Exposed Pad (ML), 8x8 mm |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Packaging | Tube / Tray |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16LF74-I/ML
| Chân 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Chân 7 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 8 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 9 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| Chân 10 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 11 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 12 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 13 | RD0 — PORTD bit 0 |
| Chân 14 | RD1 — PORTD bit 1 |
| Chân 15 | RD2 — PORTD bit 2 |
| Chân 16 | RD3 — PORTD bit 3 |
| Chân 17 | RD4 — PORTD bit 4 |
| Chân 18 | RD5 — PORTD bit 5 |
| Chân 19 | RD6 — PORTD bit 6 |
| Chân 20 | RD7 — PORTD bit 7 |
| Chân 21 | VSS — Ground |
| Chân 22 | VDD — Positive supply voltage |
| Chân 23 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 24 | RB1 — PORTB bit 1 |
| Chân 25 | RB2 — PORTB bit 2 |
| Chân 26 | RB3 — PORTB bit 3 |
| Chân 27 | RB4 — PORTB bit 4 |
| Chân 28 | RB5 — PORTB bit 5 |
| Chân 29 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 30 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 31 | MCLR/VPP — Master clear reset / ICSP programming voltage |
| Chân 32 | RE0/RD/AN5 — PORTE bit 0 / parallel slave port read / Analog input 5 |
| Chân 33 | RE1/WR/AN6 — PORTE bit 1 / parallel slave port write / Analog input 6 |
| Chân 34 | RE2/CS/AN7 — PORTE bit 2 / parallel slave port chip select / Analog input 7 |
| Chân 35 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 36 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 37 | RC6/TX/CK — PORTC bit 6 / USART TX / synchronous clock |
| Chân 38 | RC7/RX/DT — PORTC bit 7 / USART RX / synchronous data |
| Chân 39 | VSS — Ground (secondary) |
| Chân 40 | VDD — Positive supply (secondary) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16LF74-I/ML phù hợp cho 6 Áp dụngs: Industrial Sensor Interface, Battery-Powered Portable Instrumentation, Automotive Body Electronics (Non-Safety), Consumer Appliance Control, HVAC and Smart Thermostat, Educational and Hobbyist Development.
Industrial Sensor Interface
The PIC16LF74-I/ML's 8-channel 8-bit ADC, 33 I/O and 2.0-5.5 V wide VDD make it ideal for industrial multi-sensor interface panels that read 4-20 mA loops, thermistors and digital inputs. The 20 MHz CPU executes 5 MIPS, enough for 100 Hz polling across 8 channels while filtering with simple digital IIR. The 44-pin QFN (8x8 mm) footprint simplifies dense PCB layouts in control cabinets where space is at a premium, and the USART links to a host PLC or HMI display. Industrial-grade -40C to +85C operation ensures reliable sensor conditioning on factory floors with wide temperature swings.
Được đề xuất
Battery-Powered Portable Instrumentation
The PIC16LF74-I/ML operates from 2.0 V to 5.5 V, allowing direct connection to 2x AA alkaline or Li-coin cells without a boost converter. Its 'LF' low-power process and sleep currents in the microamp range extend battery life in handheld multimeters, data loggers and remote sensors. The 7 KB Flash holds the full instrument firmware including calibration tables, and the ICSP interface lets field technicians update firmware without opening the enclosure. The 8-channel ADC and dual analog comparators handle direct sensor input with no external signal chain.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC16LF74-I/ML is widely used in non-safety automotive body modules such as interior lighting, seat controllers, HVAC blend doors and accessory multiplexers. Its 33 I/O drive LEDs, switches and small relay coils directly, and the USART/MSSP enables LIN-bus slaving via external transceivers. The industrial -40C to +85C range covers cabin environments, though safety-critical modules should use AEC-Q100-qualified PIC18 variants. The wide VDD tolerance handles load-dump events when paired with an external TVS clamp.
Được đề xuất
Consumer Appliance Control
The PIC16LF74-I/ML brings low-cost 8-bit intelligence to washing machines, microwave ovens, dishwashers and HVAC thermostats. Its 7 KB Flash holds appliance control algorithms, the 8-channel ADC reads temperature/pressure/humidity sensors, and PWM drives motor control signals for brushless DC fans or triac-fired heaters. The ICSP interface allows manufacturing-time calibration and field firmware refresh for product variants. Compared to discrete logic designs, the PIC16LF74-I/ML reduces BOM count while adding diagnostic features like fault LEDs and end-of-cycle beepers.
Được đề xuất
HVAC and Smart Thermostat
The PIC16LF74-I/ML's 8-channel ADC and dual analog comparators handle multiple NTC thermistors used in multi-zone HVAC control, while its 20 MHz CPU runs proportional control loops at 10 Hz update rate without taxing MIPS budget. The 33 I/O drive triac interfaces, fan relays, and 7-segment or LCD displays directly. Its 2.0 V to 5.5 V range accommodates 24 VAC wall power after rectification, and the ICSP interface simplifies thermostat calibration during manufacturing. Compared to dedicated thermostat ASICs, the PIC16LF74-I/ML offers flexibility to support multiple SKUs from one firmware base.
Được đề xuất
Educational and Hobbyist Development
The PIC16LF74-I/ML remains a popular 8-bit teaching platform thanks to its 44-pin QFN package, breadboard-friendly variants (PIC16F74 in DIP) and free Microchip MPLAB X IDE toolchain. Students learn timer/counter interrupts, ADC sampling, USART communication and PWM motor control on a single chip with abundant I/O. The 7 KB Flash is large enough for full classroom projects including line-following robots, digital clocks and weather stations. With the PICkit 4 programmer, ICSP programming is straightforward, making the PIC16LF74 a teaching staple in introductory embedded systems courses.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF74-I/ML — 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 | PIC16LF747-I/PT | PIC16LF727-I/MV | PIC16LF722-I/ML | PIC16LF737T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN (ML) | 44-pin PLCC (L) - drop-in die | 44-pin TQFP (PT) | 44-pin UQFN (MV) | 44-pin QFN (ML) - same | 44-pin QFN (ML) - same |
| Program Memory | 7 KB Flash | 7 KB Flash | 14 KB Flash | 8 KB Flash | 3.5 KB Flash | 7 KB Flash |
| RAM | 192 bytes | 192 bytes | 368 bytes | 256 bytes | 128 bytes | 368 bytes |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 33 | 33 | 36 | 36 | 36 | 36 |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8/10-bit | 9 ch x 8-bit + CTMU | 11 ch x 8-bit | 11 ch x 8-bit |
Bảo phân biệt quan trọng
- Compact 44-pin QFN with 33 I/O at industrial temperature grade (vsPIC16F74-I/P (DIP-40))
- Wide 2.0-5.5 V VDD supports 2x AA battery designs (vsPIC16F74 (5 V only))
- On-chip ICSP supports in-field firmware refresh (vsDiscrete 8-bit logic replacement)
Ghi chú thiết kế
The 44-pin QFN (ML) package has an exposed thermal pad on the underside that must be soldered to a continuous ground plane for electrical performance and thermal dissipation. Use at least 5 ground vias in the EP land pattern to stitch the thermal pad to inner ground layers. Recommended land pattern dimensions are 8x8 mm with 0.65 mm pitch; refer to Microchip packaging application note AN246 for non-standard QFN breakout recommendations.
Ensure the MCLR pin has a 10 kohm pull-up to VDD and a 100 nF decoupling capacitor to ground for proper reset behaviour. If ICSP programming is required, do not place any capacitor (>1 nF) directly on PGC/PGD pins RB6/RB7, as this will prevent the programmer from driving the lines. Also avoid using the secondary oscillator pins as GPIO when the ICSP debug is active.
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (the PIC16LF74 has two VDD pins: 22 and 40), and a single 10 uF bulk capacitor near the IC. For battery-powered designs, route VDD via the MCP1700 or similar low-IQ LDO to extend battery life. Brown-out detection should be enabled in the configuration word to prevent code runaway below 2.0 V.
For ADC accuracy, place the analog reference decoupling capacitor (1-10 uF) directly on the VREF+/VREF- pins with a star-ground topology. Keep analog traces (RA0-RA5) away from digital switching lines like PWM outputs. Use a 10 kHz or lower ADC sampling frequency when reading high-impedance sensors, and add a 100 nF bypass on each analog input for noise reduction.
Thông tin tuân thủ
Industrial-grade -40C to +85C. Not AEC-Q100 qualified - automotive safety applications should use AEC-Q100 qualified PIC18 variants. RoHS/REACH compliant per Microchip product declaration.
