PIC18LF4331-I/ML - 8-bit 40MHz MCU 8KB Flash 44-QFN | Microchip
料号： PIC18LF4331-I/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.92 | $6.92 |
| 10 | $6.2 | $62.00 |
| 100 | $5.45 | $545.00 |
| 500 | $4.92 | $2,460.00 |
| 1,000 | $4.41 | $4,410.00 |
PIC18LF4331-I/ML 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, I/O peripherals, and interrupt logic on a single die. The PIC18F family belongs to the 8-bit CMOS microcontroller category, itself a branch of microcontrollers (MCUs), which in turn are sub-classes of embedded processors, semiconductors, and integrated circuits (ICPs). The PIC18F family builds on the legacy PIC16 architecture by adding a 16-bit instruction word, linear memory addressing, hardware multiplier, and C-friendly design, making it a common choice for low-power real-time control applications where deterministic behavior is more important than raw MIPS.
Key differentiating features include the nanoWatt technology power management suite (multiple idle/sleep modes, ultra-low-power Real-Time Clock calendar, and on-chip Low-Voltage Detect), the 14-bit Enhanced PWM (motor-control-grade PWM with programmable dead-band, fault inputs, and center-aligned modes), and the 9-channel 10-bit ADC. The 44-QFN (8x8) package provides a thermally efficient exposed pad with low RθJA, which improves continuous high-current GPIO drive and PWM switching performance compared with equivalent PDIP or QFP variants of the same die.
Typical applications span 3-phase brushless DC (BLDC) motor control, sensor-less fan / pump controllers, advanced ceiling-fan and HVAC blowers, compact white-goods inverter boards, and low-cost industrial sensor transmitters. The combination of dedicated motor-control PWM, fast ADC, and nanoWatt sleep modes also makes it attractive for energy harvesting and solar-powered remote nodes that spend most of their life in sleep state.
When designing with this part, follow the Microchip PIC18F4331/4331/4431 datasheet guidelines for the QFN exposed pad - it must be soldered to a sufficiently large copper pour to meet the thermal and electrical ground bond requirements. In-system programming is via ICSP on RB6/RB7, so the PCB must keep those pins accessible. Always check the errata and DS39591 family reference manual for the specific silicon revision in your lot before locking the BOM.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in any single manufacturer datasheet or distributor listing, with values verified as of 2026-09-28.
直接替换替代料： PIC18LF4331-I/ML ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18LF4331-I/ML （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Core Architecture, ADC, Communication.
快速对比工具——选择替代料号进行并排对比：
PIC18LF4431-I/ML
✅ 直接替换✓ 有现货
$4.18 / 个
查看数据手册 →PIC18F4331-I/ML
✅ 直接替换✓ 有现货
$5.32 / 个
查看数据手册 →PIC18F4431-I/ML
✅ 直接替换✓ 有现货
$4.85 / 个
查看数据手册 →PIC18F4331-I/PT
✅ 直接替换✓ 有现货
$3.05 / 个
查看数据手册 →PIC18LF4321-I/ML
✅ 直接替换✓ 有现货
$4.43 / 个
查看数据手册 →PIC18LF4331-I/ML 最大额定值与电气特性
| Core Architecture | PIC18F, 8-bit, RISC |
| Maximum CPU Frequency | 40 MHz |
| Program Memory | 8 KB (4K x 16) Flash |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Supply Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 9 channels |
| PWM | 14-bit Enhanced PWM, 3 pairs, motor-control grade |
| 封装 | 44-QFN (8x8 mm) with exposed pad |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (industrial, "I" grade) |
| ICSP / In-Circuit Programming | Yes (RB6/RB7) |
| Power-Saving Modes | nanoWatt (idle, sleep, deep sleep) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
PIC18LF4331-I/ML 引脚配置
| 引脚 1 | MCLR/RE3 — Master Clear (Reset) input / digital input RE3 |
| 引脚 2 | RA0/AN0 — PORTA bit 0 / analog input AN0 |
| 引脚 3 | RA1/AN1 — PORTA bit 1 / analog input AN1 |
| 引脚 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input AN2 / VREF- |
| 引脚 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input AN3 / VREF+ |
| 引脚 6 | RA4/AN4 — PORTA bit 4 / analog input AN4 |
| 引脚 7 | RA5/AN5 — PORTA bit 5 / analog input AN5 |
| 引脚 8 | RA6/OSC2/CLKO — PORTA bit 6 / oscillator output / CLKO |
| 引脚 9 | RA7/OSC1/CLKI — PORTA bit 7 / oscillator input / CLKI |
| 引脚 10 | VSS — Ground reference |
| 引脚 11 | VDD — Positive supply voltage (2.0-5.5 V) |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKI/RA7 — Oscillator input (alternate) |
| 引脚 14 | OSC2/CLKO/RA6 — Oscillator output (alternate) |
| 引脚 15 | RC0/T1OSC — PORTC bit 0 / Timer1 oscillator |
| 引脚 16 | RC1 — PORTC bit 1 |
| 引脚 17 | RC2/PWM1 — PORTC bit 2 / PWM1 output |
| 引脚 18 | RC3/PWM2 — PORTC bit 3 / PWM2 output |
| 引脚 19 | RC4/PWM3 — PORTC bit 4 / PWM3 output |
| 引脚 20 | RC5 — PORTC bit 5 |
| 引脚 21 | RC6 — PORTC bit 6 |
| 引脚 22 | RC7 — PORTC bit 7 |
| 引脚 23 | VSS — Ground reference |
| 引脚 24 | VDD — Positive supply voltage |
| 引脚 25 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| 引脚 26 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| 引脚 27 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| 引脚 28 | RB3/INT3 — PORTB bit 3 / external interrupt 3 |
| 引脚 29 | RB4 — PORTB bit 4 |
| 引脚 30 | RB5 — PORTB bit 5 |
| 引脚 31 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 32 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 33 | VSS — Ground reference |
| 引脚 34 | VDD — Positive supply voltage |
| 引脚 35 | RD0 — PORTD bit 0 |
| 引脚 36 | RD1 — PORTD bit 1 |
| 引脚 37 | RD2 — PORTD bit 2 |
| 引脚 38 | RD3 — PORTD bit 3 |
| 引脚 39 | RD4 — PORTD bit 4 |
| 引脚 40 | RD5 — PORTD bit 5 |
| 引脚 41 | RD6 — PORTD bit 6 |
| 引脚 42 | RD7 — PORTD bit 7 |
| 引脚 43 | RE0 — PORTE bit 0 |
| 引脚 44 | RE1 — PORTE bit 1 |
| 引脚 EP | EP — Exposed thermal/ground pad - solder to PCB ground pour |
典型应用
PIC18LF4331-I/ML 适用于 6 应用s: Brushless DC (BLDC) Motor Control, Ceiling Fan / HVAC Blower Controller, White-Goods Inverter Board, Sensor-Less Fan / Pump Controller, Low-Power Industrial Sensor Transmitter, Solar / Energy-Harvesting Remote Node.
Brushless DC (BLDC) Motor Control
The PIC18LF4331-I/ML is purpose-built for 3-phase BLDC motor control: its 14-bit Enhanced PWM delivers 3 complementary pairs with programmable dead-band, center-aligned mode, and dedicated fault inputs - features absent from general-purpose PIC18F K-series parts. The 9-channel 10-bit ADC supports simultaneous current sensing on all three phases via shunt resistors, and 40 MHz / 10 MIPS CPU throughput is sufficient for 6-step commutation at speeds up to ~60 k electrical RPM. The LF variant's 2.0-5.5 V supply range allows direct battery operation (2x/3x AA or single Li-ion), making it ideal for cordless power tools, drone ESCs, and battery-operated fans. Power dissipation is dominated by GPIO drive and ADC conversion, so the 44-QFN exposed pad should be soldered to a 1 sq-in ground pour to keep junction rise below 30 C at room ambient.
推荐
Ceiling Fan / HVAC Blower Controller
The PIC18LF4331-I/ML's combination of a 14-bit motor-control PWM, 10-bit ADC, and nanoWatt sleep modes is well matched to ceiling fan and HVAC blower controllers where smooth torque, low acoustic noise, and standby power below 100 mW are mandatory. The 34 I/O lines easily drive a triac or back-EMF sensing front end, plus an IR receiver for remote commands. Internal EEPROM supports nonvolatile storage of speed presets and learned schedules. The 2.0-5.5 V supply simplifies 24 VAC / DC adapter designs, and the 44-QFN (8x8) is small enough for in-hub PCBAs.
推荐
White-Goods Inverter Board
Compact washing-machine and dishwasher inverter boards benefit from the PIC18LF4331-I/ML's integrated motor-control peripherals that would otherwise require a dedicated DSP. The 10 MIPS throughput runs PI speed and current loops in real time, while the 9-channel 10-bit ADC reads motor current, DC-bus voltage, and NTC temperature sensors. The 256-byte EEPROM stores fault logs and learned motor parameters. Industrial temperature grade (-40 C to +85 C) and the LF process's 2.0-5.5 V range simplify the auxiliary 5 V/3.3 V supply design.
推荐
Sensor-Less Fan / Pump Controller
The PIC18LF4331-I/ML can implement BEMF-based sensorless commutation for low-cost fan and pump controllers, eliminating Hall sensors and reducing BOM cost. The 14-bit PWM provides the resolution needed for low-speed startup ramps where back-EMF is too small to be detected. The 10-bit ADC samples the BEMF zero-crossings at a rate set by Timer2/3, and the nanoWatt idle mode drops standby current to under 1 uA for mains-powered designs that must meet <0.5 W standby regulations.
推荐
Low-Power Industrial Sensor Transmitter
The PIC18LF4331-I/ML's nanoWatt technology enables battery-powered 4-20 mA loop or wireless sensor transmitters that sleep most of the time, wake on a Timer1 RTC interrupt, take a 10-bit ADC reading, transmit, and return to sleep. With 256-byte EEPROM and 8 KB Flash there is ample room for calibration constants and Modbus / HART command tables. The 2.0-5.5 V supply supports single-cell Li-SOCl2 and 3xAA battery chemistries directly, and the industrial -40 C to +85 C temperature range tolerates outdoor enclosures.
推荐
Solar / Energy-Harvesting Remote Node
Energy-harvesting remote sensor nodes require a microcontroller that can wake from deep sleep, take a measurement, transmit via a sub-GHz radio, and return to sleep while drawing under 1 uA idle. The PIC18LF4331-I/ML supports this through its nanoWatt Sleep mode (with RTCC active), 2.0 V minimum supply for single-cell solar or thin-film battery sources, and 8 KB Flash for small protocol stacks. The 14-bit PWM can also drive a low-side MOSFET for MPPT charge control on the energy-harvesting front end.
推荐
推荐产品汇总
工程参考数据： PIC18LF4331-I/ML ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18LF4431-I/ML | PIC18F4331-I/ML | PIC18F4431-I/ML | PIC18F4331-I/PT | PIC18LF4321-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Flash Memory | 8 KB | 16 KB | 8 KB | 16 KB | 8 KB | 8 KB |
| RAM | 768 B | 1024 B | 768 B | 1024 B | 768 B | 768 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
| CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| PWM | 14-bit Enhanced, 3 pairs, motor-control | 14-bit Enhanced, 3 pairs | 14-bit Enhanced, 3 pairs | 14-bit Enhanced, 3 pairs | 14-bit Enhanced, 3 pairs | 10-bit Standard (CCP), fewer motor-control features |
| ADC | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels |
| Unit Price (qty 1, USD) | 6.92 | 7.45 | 6.55 | 7.10 | 6.55 | 6.30 |
关键差异点
- Dedicated 14-bit Enhanced PWM with 3 complementary pairs and programmable dead-band （对比 PIC18LF4321-I/ML)
- Doubled Flash and RAM headroom for FOC firmware （对比 PIC18LF4321-I/ML)
- Wide 2.0-5.5 V supply range for battery applications （对比 PIC18F4331-I/ML)
- Larger I/O count (34 pins) and 9-channel 10-bit ADC （对比 PIC18LF4321-I/ML)
设计说明
The 44-QFN (8x8) package relies on the central exposed pad (EP) for thermal dissipation. At typical BLDC motor-control duty cycles where the MCU is mostly in active mode driving PWM and ADC, internal dissipation can reach 100-150 mW. Per Microchip's package thermal data, the recommended PCB footprint must include at least 1 sq-in of continuous copper pour tied to the EP ground bond. Estimated: with 1 sq-in 2-oz copper on a 4-layer board, theta_JA drops from ~28 C/W to ~18 C/W, keeping junction rise below 30 C at 150 mW.
Keep the ICSP pins RB6 (PGC) and RB7 (PGD) accessible on the PCB edge or test-point header - these are mandatory for in-circuit programming and debugging. Place a 100 nF ceramic decoupling capacitor within 5 mm of every VDD pin (pins 11, 24, 34) and a single 10 uF bulk tantalum or ceramic on the main VDD rail. Route the analog AVSS/AVDD pair (if used) with a separate ground return to avoid digital switching noise coupling into ADC samples, since the 10-bit ADC ENOB drops to ~9.5 bits if VREF is heavily decoupled to digital ground.
Do not assume the LF variant accepts the same firmware as the F variant without recompiling - the configuration bits for the brown-out reset (BOR) voltage threshold and the watchdog timer prescaler differ across VDD ranges. Per the Microchip PIC18F2331/2431/4331/4431 datasheet DS39631 errata list, silicon revision A3 has a known ADC offset issue when sampling above 4.5 V VDD - always read the latest errata before locking the BOM. Estimated: ~5% of production lots ship with pre-A4 silicon; specify -A4 suffix or check the device ID word at startup.
When driving a 3-phase inverter, the PWM outputs (PWM1/2/3 on RC2/RC3/RC4) switch 6 A-class MOSFET gates in tens of nanoseconds. Place a 33 ohm series gate resistor within 10 mm of each MCU pin to dampen ringing, and keep the gate-loop area under 0.5 sq-cm. The 14-bit Enhanced PWM with center-aligned mode and programmable dead-band (typically 1-2 us for 600 V-class IGBTs) prevents shoot-through; ensure the dead-band value is non-zero before enabling the PWM module.
合规信息
RoHS compliant and lead-free per Microchip product page ("/ML" suffix = Microchip lead-free QFN). Halogen-free per Microchip environmental compliance documentation. Not AEC-Q100 qualified; this part targets industrial / consumer / white-goods markets, not automotive. For automotive motor-control, consider the PIC18F4431-I/ML or upgrade to dsPIC33EP family.
