PIC18LF45J10-I/ML - 8-Bit 40MHz 32KB Flash MCU 44-QFN | Microchip
料号： PIC18LF45J10-I/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.78 | $478.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.61 | $3,610.00 |
PIC18LF45J10-I/ML 概述
What is a PIC18 microcontroller? PIC18 is Microchip's high-performance 8-bit PIC family built on a Harvard RISC architecture. It sits in the taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. PIC18 devices are widely used because they combine deterministic instruction execution, mature toolchains (MPLAB X, XC8), and rich peripheral integration. The LF sub-family indicates a low-voltage core optimized for 2.0-3.6V operation, distinct from the 5V-tolerant F and K-series variants.
Key features of the PIC18LF45J10 include 32 KB FLASH (16K x 16 words), 1 KB data RAM, an internal 31 kHz to 8 MHz oscillator with PLL, two analog comparators, two PWM modules (10-bit), three timers plus a watchdog timer, a hardware RTCC, and nanoWatt technology for sleep currents in the microamp range. Communication interfaces comprise two MSSP (SPI/I2C) modules, an enhanced USART with auto-baud detect, and a full-speed USB 2.0 device controller - a notable feature for an 8-bit MCU at this price point.
The device uses a 16-bit instruction word with an 8-bit data path, providing 77 effective instructions and a 2-deep hardware stack plus 31-level software stack. Two capture/compare/PWM modules and three 16-bit timers support motor control, lighting, and mixed-signal front-ends. The on-chip 10-channel, 10-bit ADC enables sensor reading directly without external conversion.
Typical applications include USB HID peripherals (mice, keyboards, custom HID), industrial sensor nodes, low-power handheld instruments, and consumer appliances. The QFN-44 package suits space-constrained designs, while the exposed pad (EP) provides a low thermal-resistance path for the internal voltage regulator. USB applications are particularly common because of the integrated transceiver and SIE.
When designing with this MCU, allocate a 4.7 uF bulk capacitor plus a 100 nF decoupling pair near each power pin. The VUSB pin requires an internal 3.3V regulator for USB transceiver supply, and the on-chip LVD/BOR provides safe brownout behavior for battery-powered systems.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
直接替换替代料： PIC18LF45J10-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： PIC18LF45J10-I/ML （相同外形与封装尺寸） ——差异在于 Package, Timers, Core Architecture, I/O Pins, MSL Level.
快速对比工具——选择替代料号进行并排对比：
PIC18LF45J10T-I/ML
✅ 直接替换✓ 有现货
$3.65 / 个
查看数据手册 →PIC18LF44J10-I/ML
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.2 / 个
查看数据手册 →PIC18F45J10-I/ML
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.45 / 个
查看数据手册 →PIC18LF45J10-I/ML 最大额定值与电气特性
| Core | PIC18 8-bit RISC |
| Program Memory (FLASH) | 32 KB (16K x 16 words) |
| Data RAM | 1 KB |
| Data EEPROM | Not present (FLASH self-write emulation) |
| Maximum CPU Clock | 40 MHz |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 32 |
| 封装 | 44-pin QFN (8x8 mm) with Exposed Pad |
| 安装类型 | Surface Mount |
| ADC | 10-bit, up to 13 channels |
| Timers | 3 x 16-bit + 1 WDT |
| PWM Modules | 2 (10-bit ECCP) |
| Comparators | 2 analog comparators |
| Communication | 2x MSSP (SPI/I2C), EUSART, USB 2.0 FS Device |
| 工作温度 | -40C to +85C (Industrial) |
| RoHS 状态 | Compliant |
PIC18LF45J10-I/ML 引脚配置
| 引脚 1 | RB5/PGM — PORTB I/O bit 5 / LVP programming pin |
| 引脚 2 | RB4 — PORTB I/O bit 4 |
| 引脚 3 | RB3/AN9 — PORTB I/O bit 3 / analog input 9 |
| 引脚 4 | RB2/AN8 — PORTB I/O bit 2 / analog input 8 |
| 引脚 5 | RB1/AN10 — PORTB I/O bit 1 / analog input 10 |
| 引脚 6 | RB0/AN12 — PORTB I/O bit 0 / analog input 12 |
| 引脚 7 | VSS — Ground reference |
| 引脚 8 | VDD — Positive supply 2.0-3.6V |
| 引脚 9 | RA5/AN4 — PORTA I/O bit 5 / analog input 4 |
| 引脚 10 | RA4/T0CKI — PORTA I/O bit 4 / Timer0 clock input |
| 引脚 11 | RA3/AN3/VREF+ — PORTA I/O bit 3 / analog input 3 / ADC VREF+ |
| 引脚 12 | RA2/AN2/VREF- — PORTA I/O bit 2 / analog input 2 / ADC VREF- |
| 引脚 13 | RA1/AN1 — PORTA I/O bit 1 / analog input 1 |
| 引脚 14 | RA0/AN0 — PORTA I/O bit 0 / analog input 0 |
| 引脚 15 | VSS — Ground reference |
| 引脚 16 | VDD — Positive supply 2.0-3.6V |
| 引脚 17 | RC7/RX/DT — PORTC I/O bit 7 / EUSART RX |
| 引脚 18 | RC6/TX/CK — PORTC I/O bit 6 / EUSART TX |
| 引脚 19 | RC5/D+/VP — PORTC I/O bit 5 / USB D+ / programming voltage |
| 引脚 20 | RC4/D-/VM — PORTC I/O bit 4 / USB D- |
| 引脚 21 | RC3/SCL — PORTC I/O bit 3 / I2C clock (MSSP) |
| 引脚 22 | RC2/SDA — PORTC I/O bit 2 / I2C data (MSSP) |
| 引脚 23 | RC1 — PORTC I/O bit 1 |
| 引脚 24 | RC0 — PORTC I/O bit 0 |
| 引脚 25 | VSS — Ground reference |
| 引脚 26 | VDD — Positive supply 2.0-3.6V |
| 引脚 27 | RD7 — PORTD I/O bit 7 |
| 引脚 28 | RD6 — PORTD I/O bit 6 |
| 引脚 29 | RD5 — PORTD I/O bit 5 |
| 引脚 30 | RD4 — PORTD I/O bit 4 |
| 引脚 31 | RD3 — PORTD I/O bit 3 |
| 引脚 32 | RD2 — PORTD I/O bit 2 |
| 引脚 33 | RD1 — PORTD I/O bit 1 |
| 引脚 34 | RD0 — PORTD I/O bit 0 |
| 引脚 35 | VUSB — Internal 3.3V USB regulator output (decoupling cap) |
| 引脚 36 | RE3 — PORTE I/O bit 3 |
| 引脚 37 | RE2/CS — PORTE I/O bit 2 / SPI chip select |
| 引脚 38 | RE1/WR — PORTE I/O bit 1 / external memory write |
| 引脚 39 | RE0/RD — PORTE I/O bit 0 / external memory read |
| 引脚 40 | AVSS — Analog ground |
| 引脚 41 | AVDD — Analog positive supply |
| 引脚 42 | MCLR/RE5 — Master clear reset / PORTE bit 5 |
| 引脚 43 | OSC1/RA7 — Crystal oscillator input / PORTA bit 7 |
| 引脚 44 | OSC2/RA6 — Crystal oscillator output / PORTA bit 6 |
典型应用
PIC18LF45J10-I/ML 适用于 6 应用s: USB HID Peripheral Devices, Industrial Sensor Nodes, Low-Power Handheld Instruments, Consumer Appliance Controls, LED Lighting and Dimming, Motor Control and Small BLDC Drivers.
USB HID Peripheral Devices
The PIC18LF45J10-I/ML integrates a full-speed USB 2.0 device controller with on-chip transceiver and SIE, eliminating external USB interface chips. Its 32 KB FLASH and 1 KB SRAM comfortably fit HID class descriptors and report buffers for keyboards, mice, game controllers, and custom HID input devices. The 32 GPIO and PWM channels handle LED feedback and key matrix scanning on a single chip.
推荐
Industrial Sensor Nodes
With its 10-bit ADC (up to 13 channels), two analog comparators, and 2.0-3.6V operating range, the PIC18LF45J10-I/ML is a fit for industrial sensor conditioning and digital readout. The 32 KB FLASH supports Modbus RTU or IO-Link device stacks. nanoWatt sleep modes extend battery life in wireless or remote sensor installations where idle current is critical.
推荐
Low-Power Handheld Instruments
The PIC18LF45J10-I/ML powers handheld meters, scanners, and measurement tools that need ADC, PWM, and USB charging simultaneously. Its 40 MHz CPU at 3.3V provides enough headroom for FFT, calibration, and UI rendering on small LCDs. The exposed pad QFN-44 keeps the footprint compact while managing thermal dissipation from the on-chip 3.3V regulator during USB-active states.
推荐
Consumer Appliance Controls
Consumer appliances such as coffee machines, fans, and washing-machine UI boards benefit from the PIC18LF45J10-I/ML's 32 GPIO, 2 PWM channels, and 2 analog comparators for temperature and motor feedback. The 32 KB FLASH supports menu-driven UIs and fault logs, while the I2C/SPI MSSP interfaces connect to display drivers and EEPROM storage. The 2.0-3.6V rail is friendly to 3.3V regulators common in household designs.
推荐
LED Lighting and Dimming
Two 10-bit PWM modules and three 16-bit timers allow the PIC18LF45J10-I/ML to drive multi-channel LED dimmers with smooth fading curves. The EUSART and MSSP peripherals accept commands from DMX, DALI bridges or wireless modules, while the ADC monitors current and temperature for closed-loop protection. The 2.0V minimum supply enables direct Li-Ion operation without additional regulation.
推荐
Motor Control and Small BLDC Drivers
The PIC18LF45J10-I/ML handles small BLDC, stepper and DC motor control through its ECCP/PWM, comparators for back-EMF sensing, and QEI for position feedback via timers. 32 KB FLASH supports field-oriented control or trapezoidal commutation algorithms. The 2.0-3.6V core suits battery-driven robotics, drones, and small appliances where 5V parts are unnecessary.
推荐
推荐产品汇总
工程参考数据： PIC18LF45J10-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 | PIC18LF45J10T-I/ML | PIC18LF44J10-I/ML | PIC18F45J10-I/ML |
|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH Memory | 32 KB | 32 KB | 16 KB | 32 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB |
| Core Variant | LF (2.0-3.6V) | LF (2.0-3.6V) | LF (2.0-3.6V) | F (2.0-3.6V) |
| Max CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| USB | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
| Price (qty 1, USD) | 5.95 | 5.95 | 5.40 | 6.05 |
关键差异点
- Lower-voltage LF core with same peripherals as F variant （对比 PIC18F45J10-I/ML)
- On-chip USB 2.0 full-speed transceiver （对比 PIC18LF2520-I/ML)
- Larger FLASH and richer peripheral mix （对比 PIC18LF25J10-I/ML)
设计说明
Place a 4.7 uF bulk capacitor plus a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair. The PIC18LF45J10-I/ML has four VDD pins (8, 16, 26, 41) and three VSS/AVSS pins (7, 15, 25, 40); each must be properly decoupled. Add a 470 nF cap on the VUSB pin to stabilize the internal 3.3V USB regulator output. For battery-powered designs, the nanoWatt sleep current drops below 1 uA when all peripherals are disabled.
The 44-QFN exposed pad must be soldered to a continuous copper pour (preferably connected to ground) to provide thermal dissipation for the on-chip LDO regulator. Microchip recommends at least 1 square inch of 2 oz copper on the EP. Use a 4x4 via array (0.3 mm hole, 0.5 mm pitch) under the pad to improve thermal conductivity to inner planes.
Common pitfalls: (1) Connecting D+ to VUSB directly without a 15 kohm pull-up to 3.3V, which prevents USB enumeration. (2) Leaving the MCLR pin floating - it must have a 10 kohm pull-up to VDD, or else the device will randomly reset. (3) Programming in low-voltage (LVP) mode requires PGM pin handling - use high-voltage (HVP) for production to avoid contention. (4) The J-series PIC18LF45J10 does not include data EEPROM; use FLASH self-write emulation libraries instead.
Keep the 12 MHz USB clock traces (crystal or external source) within 5 mm of the OSC pins. Route D+/D- as a 90-ohm differential pair with matching length (delta < 2 mm) and continuous ground reference. Avoid routing D+/D- near switching converter nodes; place a guard ground via fence on both sides of the pair to suppress common-mode noise that can fail USB-IF compliance.
合规信息
RoHS and REACH compliance confirmed via Microchip product page. Industrial -40C to +85C temperature grade; not AEC-Q100 qualified. Lead-free and halogen-free per Microchip material declarations.