PIC18LF45J50T-I/ML - 8-bit USB MCU, 32KB Flash, 44-QFN | Microchip
料号： PIC18LF45J50T-I/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.78 | $57.80 |
| 100 | $4.92 | $492.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.65 | $3,650.00 |
PIC18LF45J50T-I/ML 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and a rich set of peripherals. The PIC18 family uses an enhanced Harvard RISC architecture optimized for deterministic real-time control and low-power operation, sitting within Microchip's broader 8-bit MCU portfolio (PIC10/12/16/18) that is widely deployed in consumer, industrial, and USB-connected embedded systems.
Key specifications include 32KB (16K x 16) of self-programmable Flash, 4KB RAM, 256 bytes of EEPROM, a 10-bit ADC with up to 13 channels, two USB transceivers (full-speed 12 Mbps and low-speed 1.5 Mbps), nanoWatt XLP power management, and an extended operating voltage range of 2.0V to 3.6V suited to battery-powered designs.
The architecture combines a modified Harvard bus with a 16-bit instruction word and 8-bit data path, achieving up to 16 MIPS throughput at 48 MHz. The integrated USB peripheral handles physical-layer signaling in hardware, eliminating external transceivers and reducing BOM cost for HID, CDC, and vendor-class USB device applications.
Typical applications include USB peripherals (HID keypads, game controllers, CDC virtual COM ports, MIDI adapters), low-power sensor data loggers, portable medical and instrumentation devices, and battery-powered industrial IoT nodes that require direct USB connectivity without external PHY chips.
When designing with this device, allocate the bottom 8KB of Flash for the USB bootloader to enable field firmware upgrades via USB. Ensure the exposed pad (EP) is soldered to a sufficiently large copper pour for thermal dissipation, as the QFN package relies primarily on PCB heat spreading.
This page synthesizes current distributor stock and pricing, drop-in same-package alternatives, and practical design notes not collected together in the manufacturer datasheet.
直接替换替代料： PIC18LF45J50T-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： PIC18LF45J50T-I/ML （相同外形与封装尺寸） ——差异在于 ADC, Package, Operating Temperature, Core, Timers.
快速对比工具——选择替代料号进行并排对比：
PIC18LF45J50-I/ML
✅ 直接替换✓ 有现货
$3.75 / 个
查看数据手册 →PIC18LF45J50T-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC18F47J53-I/ML
✅ 直接替换✓ 有现货
$5.2 / 个
查看数据手册 →PIC18F46J50-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF44J50T-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF45J50T-I/ML 最大额定值与电气特性
| Series | PIC18LF45J50 (PIC XLP 18J) |
| Core | PIC18 (8-bit Harvard RISC) |
| 最大时钟频率 | 48 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 Full-Speed (12 Mbps) and Low-Speed (1.5 Mbps), integrated transceiver |
| ADC | 10-bit, up to 13 input channels |
| I/O Pins | 34 digital I/O |
| Timers | 4 (Timer0/1/2/3) plus RTCC |
| Communication | USB, 2x SPI, 2x I2C, 2x UART, EUSART |
| Power-Saving Modes | nanoWatt XLP (Sleep, Idle, Doze, Low-Voltage Sleep) |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 44-pin QFN with Exposed Pad (8x8 mm), Surface Mount |
| 安装类型 | Surface Mount, Tape & Reel |
| MSL 等级 | 3 |
| RoHS 状态 | Compliant |
PIC18LF45J50T-I/ML 引脚配置
| 引脚 1 | RB5 — Digital I/O - PORTB bit 5 |
| 引脚 2 | RB4 — Digital I/O - PORTB bit 4 |
| 引脚 3 | RB3 — Digital I/O - PORTB bit 3 |
| 引脚 4 | RB2 — Digital I/O - PORTB bit 2 |
| 引脚 5 | RB1 — Digital I/O - PORTB bit 1 |
| 引脚 6 | RB0 — Digital I/O - PORTB bit 0 (INT0/FLT0) |
| 引脚 7 | VDD — Positive supply voltage (2.0 V to 3.6 V) |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | RC7 — Digital I/O - PORTC bit 7 (RX/DT) |
| 引脚 10 | RC6 — Digital I/O - PORTC bit 6 (TX/CK) |
| 引脚 11 | RC5 — Digital I/O / USB D- |
| 引脚 12 | RC4 — Digital I/O / USB D+ |
| 引脚 13 | RC3 — Digital I/O - PORTC bit 3 (SCL) |
| 引脚 14 | RC2 — Digital I/O - PORTC bit 2 |
| 引脚 15 | RC1 — Digital I/O - PORTC bit 1 (SDA) |
| 引脚 16 | RC0 — Digital I/O - PORTC bit 0 |
| 引脚 17 | OSC1 — External oscillator input / CLKIN |
| 引脚 18 | OSC2 — External oscillator output / CLKOUT |
| 引脚 19 | RA0 — Digital I/O - PORTA bit 0 / AN0 |
| 引脚 20 | RA1 — Digital I/O - PORTA bit 1 / AN1 |
| 引脚 21 | RA2 — Digital I/O - PORTA bit 2 / AN2 |
| 引脚 22 | RA3 — Digital I/O - PORTA bit 3 / AN3 / VREF+ |
| 引脚 23 | RD0 — Digital I/O - PORTD bit 0 |
| 引脚 24 | RD1 — Digital I/O - PORTD bit 1 |
| 引脚 25 | RD2 — Digital I/O - PORTD bit 2 |
| 引脚 26 | RD3 — Digital I/O - PORTD bit 3 |
| 引脚 27 | RD4 — Digital I/O - PORTD bit 4 |
| 引脚 28 | RD5 — Digital I/O - PORTD bit 5 |
| 引脚 29 | RD6 — Digital I/O - PORTD bit 6 |
| 引脚 30 | RD7 — Digital I/O - PORTD bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply voltage (2.0 V to 3.6 V) |
| 引脚 33 | RB6 — Digital I/O - PORTB bit 6 (PGC, ICSP clock) |
| 引脚 34 | RB7 — Digital I/O - PORTB bit 7 (PGD, ICSP data) |
| 引脚 35 | RA4 — Digital I/O - PORTA bit 4 / AN4 |
| 引脚 36 | RA5 — Digital I/O - PORTA bit 5 / AN5 / MCLR |
| 引脚 37 | RE0 — Digital I/O - PORTE bit 0 / AN6 |
| 引脚 38 | RE1 — Digital I/O - PORTE bit 1 / AN7 |
| 引脚 39 | RE2 — Digital I/O - PORTE bit 2 / AN8 |
| 引脚 40 | RE3 — Digital I/O - PORTE bit 3 / AN9 |
| 引脚 41 | RA6 — Digital I/O - PORTA bit 6 / AN10 / OSC2 alt |
| 引脚 42 | RA7 — Digital I/O - PORTA bit 7 / AN11 / OSC1 alt |
| 引脚 43 | VUSB — USB internal 3.3V regulator output (bypass cap) |
| 引脚 44 | VSS — Ground reference |
| 引脚 EP | EP — Exposed thermal pad - tie to ground plane for thermal dissipation |
典型应用
PIC18LF45J50T-I/ML 适用于 7 应用s: USB HID Peripherals, USB CDC Virtual COM Port Devices, Battery-Powered Sensor Data Loggers, Industrial USB Sensor Nodes, Consumer MIDI / USB Audio Devices, Portable Instrumentation with USB Charging, Educational and Hobbyist USB Projects.
USB HID Peripherals
The PIC18LF45J50T-I/ML is well-suited for USB HID-class peripherals such as keyboards, mice, game controllers, custom HID keypads, and barcode scanners because it integrates a USB 2.0 full-speed transceiver on-chip. At 48 MHz (16 MIPS) it sustains the 1 ms USB polling interval with ample headroom for HID report parsing and debouncing. Compared to MCUs that require an external PHY, the integrated transceiver reduces BOM by ~3 components. Use the 4 KB RAM to buffer HID reports and the 32 KB Flash to host the USB stack (Microchip MLA) plus application logic.
推荐
USB CDC Virtual COM Port Devices
For USB-to-UART bridges, ISP programmers, and CDC-class virtual COM ports, the PIC18LF45J50T-I/ML provides the integrated USB transceiver and the dual UART peripherals needed to map virtual COM ports to RS-232 or RS-485 links. The 48 MHz core sustains 115200+ baud throughput with low interrupt latency, while the 2.0 V to 3.6 V supply range supports battery-powered serial adapters. Pair with an external level translator for RS-232 or run native TTL-level serial.
推荐
Battery-Powered Sensor Data Loggers
The PIC18LF45J50T-I/ML's nanoWatt XLP power management enables sub-uA sleep currents, making it ideal for battery-powered sensor data loggers that wake periodically to sample the 10-bit ADC and store readings in the 256-byte EEPROM. Operating from 2.0 V to 3.6 V, it runs directly from a single Li-Ion or 2x AA cells without an LDO. The 32 KB Flash supports RTCC-driven scheduling and small data buffering; for larger logs, stream over USB when docked.
推荐
Industrial USB Sensor Nodes
In industrial USB sensor nodes - such as temperature, pressure, and humidity probes that report to a PC - the PIC18LF45J50T-I/ML's industrial -40 C to +85 C operating range and integrated USB simplify the design. The 13-channel 10-bit ADC handles typical transducer outputs, while the two I2C and two SPI peripherals interface to external sensors. The 4 KB RAM supports local averaging and calibration tables, and the USB device stack enables plug-and-play PC connectivity.
推荐
Consumer MIDI / USB Audio Devices
For USB MIDI controllers, audio control surfaces, and volume knobs, the PIC18LF45J50T-I/ML handles HID or vendor-class USB traffic while its 13-channel ADC reads potentiometers and rotary encoders. The 48 MHz MIPS budget manages USB 1 ms polling plus debounce and encoder quadrature decoding. The compact 44-QFN (8x8 mm) package fits inside small enclosures, and the exposed pad supports thermal dissipation when I/O current is moderate.
推荐
Portable Instrumentation with USB Charging
Hand-held digital multimeters, portable oscilloscope probes, and field-calibration tools benefit from the PIC18LF45J50T-I/ML's combination of low-voltage operation (2.0-3.6 V), integrated USB for charging and data, and the 10-bit ADC for measurement. The 32 KB Flash hosts USB CDC, command parsers, and calibration constants; the 256-byte EEPROM retains setup across power cycles. Operating temperature -40 C to +85 C handles field environments.
推荐
Educational and Hobbyist USB Projects
For makers and educational platforms, the PIC18LF45J50T-I/ML is a strong choice because it integrates USB without external PHYs, is supported by the free MPLAB X IDE and XC8 compiler, and is widely documented. The 44-QFN package works with breakout boards that expose 0.1-inch headers. The low-voltage LF variant tolerates USB bus-powered designs at 3.3 V without additional regulation.
推荐
推荐产品汇总
工程参考数据： PIC18LF45J50T-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 | PIC18LF45J50-I/ML | PIC18LF45J50T-I/PT | PIC18F47J53-I/ML | PIC18F46J50-I/ML | PIC18LF44J50T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8) | 44-QFN (8x8) - same | 44-TQFP - same die, different package ordering code | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same |
| Flash Program Memory | 32 KB | 32 KB (identical) | 32 KB (identical) | 128 KB | 64 KB | 16 KB |
| RAM | 4 KB | 4 KB | 4 KB | 3.7 KB | 3.8 KB | 4 KB |
| Supply Voltage | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.0 V to 3.6 V (LF) | 2.15 V to 3.6 V (F) | 2.0 V to 3.6 V (LF) |
| USB Transceiver | Integrated FS + LS | Integrated FS + LS | Integrated FS + LS | Integrated FS + LS | Integrated FS + LS | Integrated FS + LS |
| Maximum Clock | 48 MHz / 16 MIPS | 48 MHz / 16 MIPS | 48 MHz / 16 MIPS | 48 MHz / 16 MIPS | 48 MHz / 16 MIPS | 48 MHz / 16 MIPS |
| nanoWatt XLP | Yes | Yes | Yes | Yes | Yes | Yes |
| Shipping Media | Tape & Reel | Tube | Tape & Reel (TQFP) | Tube | Tube | Tape & Reel |
关键差异点
- Integrated USB 2.0 full-speed and low-speed transceiver on-chip （对比 PIC18F25K22T-I/ML)
- Low-voltage (LF) variant operates down to 2.0 V （对比 PIC18F46J50-I/ML)
- 32 KB Flash with 4 KB RAM balances cost and capability （对比 PIC18LF44J50T-I/ML)
设计说明
The 44-QFN package (8x8 mm) requires soldering the exposed pad (EP) to a continuous ground copper pour with multiple thermal vias to the inner ground plane. Without proper EP soldering, the die cannot dissipate heat, and thermal performance degrades significantly. Recommended: at least 4 thermal vias (0.3 mm drill, 0.6 mm pad) directly under the EP tied to ground. Estimated: with EP soldered, theta_JA is approximately 28 C/W; without EP soldering, theta_JA can exceed 60 C/W.
Place a 0.47 uF ceramic bypass capacitor (X7R, 6.3V or higher) on the VUSB pin (pin 43) as close as possible; this internal 3.3V regulator powers the USB transceiver. Add a bulk 10 uF + 0.1 uF decoupling pair adjacent to each VDD pin (7, 32). Per the Microchip datasheet, insufficient VUSB decoupling causes USB enumeration failures and intermittent disconnect. For battery operation, ensure VDD never drops below 2.0 V or the brown-out reset will trigger.
Do not confuse the LF (2.0-3.6 V) and F (2.15-3.6 V) variants when sourcing - they are not interchangeable in 2.0-2.14 V low-battery scenarios. Also note that some J-series PIC18 parts require the CONFIG3L register to enable the USB regulator; failing to set this register will prevent USB from powering up. Finally, when using the internal 48 MHz oscillator, verify the OSCTUNE PLL is locked before USB transactions, or the USB clock will be out of spec.
Route USB D+ (RC4) and D- (RC5) as a 90-ohm differential pair with matched length (within 2 mm). Per the USB 2.0 specification, the differential impedance must be 90 ohms +/-10%, and skew should be under 150 ps. Place the common-mode choke and ESD protection diode close to the USB connector. Avoid running the USB pair adjacent to switching power or high-frequency clock traces to minimize EMI.
合规信息
RoHS and REACH compliant per Microchip product page; not AEC-Q100 qualified (commercial/industrial grade only). Halogen-free per Microchip environmental certification.
