PIC18LF45J10-I/P - 8-bit 40MHz 32KB Flash MCU | Microchip
料号： PIC18LF45J10-I/P ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.65 | $46.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.4 | $1,700.00 |
| 1,000 | $2.95 | $2,950.00 |
PIC18LF45J10-I/P 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals onto one silicon die. Within the broader taxonomy, the PIC18LF45J10 belongs to the 8-bit MCU category, then to the PIC18 family of enhanced Harvard-architecture devices, then to the Microchip PIC microcontroller family, and finally to the broader class of embedded microcontrollers and microprocessors. Its 8-bit data path is paired with a 16-bit instruction word that enables single-cycle execution of most operations, delivering higher throughput than legacy PIC16 designs at the same clock rate.
Key features include a 10-bit ADC with multiple input channels, two enhanced USART peripherals (one with LIN master/slave support), two MSSP (Master Synchronous Serial Port) modules capable of SPI and I2C (with address masking), a 32-segment LCD driver option on sibling parts, and 32 general-purpose digital I/O pins arranged across multiple ports. An integrated oscillator, two 8-bit timers, and three 16-bit timers provide flexible timekeeping, while the nanoWatt power management feature with multiple idle and sleep modes helps reduce quiescent current to single-digit microamps for power-sensitive applications.
Typical applications include industrial control nodes, low-cost consumer appliances, sensor conditioning front-ends, USB-to-UART bridges using external transceivers, and educational/development platforms. The wide software ecosystem (MPLAB X IDE, XC8 compiler, MPLAB Code Configurator) and the rich peripheral set make the part a popular choice for replacing older PIC16 designs that require more code space and higher clock speed.
When designing with the PIC18LF45J10-I/P, observe the 3.6V absolute maximum on VDD, place a 100 nF decoupling capacitor adjacent to each power pin, and ensure in-circuit serial programming (ICSP) lines are brought out to a header for production programming. Prefer the LF variant when operating from a single Li-ion cell (2.0V to 3.6V); otherwise, the non-LF PIC18F45J10 offers more headroom for 5V-tolerant designs.
This page synthesizes distributor pricing, parametric comparison data, and design notes that go beyond the manufacturer datasheet, including a curated drop-in alternative list of PIC18LF45K22 and PIC18LF45J11 options sharing the same 40-pin PDIP footprint for drop-in upgrades with more memory or peripherals.
直接替换替代料： PIC18LF45J10-I/P ——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/P （相同外形与封装尺寸） ——差异在于 Package, ADC, Operating Temperature, Timers, Core.
快速对比工具——选择替代料号进行并排对比：
PIC18LF45J11-I/P
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF44J10-I/P
✅ 直接替换✓ 有现货
$2.6 / 个
查看数据手册 →PIC18LF45K22-I/P
✅ 直接替换✓ 有现货
$3.35 / 个
查看数据手册 →PIC18F45J10-I/P
✅ 直接替换✓ 有现货
$2.52 / 个
查看数据手册 →PIC18F44J10-I/PT
✅ 直接替换✓ 有现货
$3.1 / 个
查看数据手册 →PIC18LF4520-I/PT
✅ 直接替换✓ 有现货
$5.21 / 个
查看数据手册 →PIC18LF45J10-I/P 最大额定值与电气特性
| Product Family | PIC18J |
| Core | PIC18 (8-bit RISC) |
| Instruction Set | 8-bit data, 16-bit instruction word |
| 最大时钟频率 | 40 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 1024 bytes (1 KB) |
| 工作电源电压 | 2.0 V to 3.6 V |
| I/O Pins | 32 |
| ADC | 10-bit, multiple channels |
| 数据总线宽度 | 8 bit |
| 工作温度 | -40 C to +85 C (Industrial) |
| 安装方式 | Through Hole |
| 封装 | 40-pin PDIP (DIP) |
| Communication Interfaces | 2x EUSART (one with LIN), 2x MSSP (SPI/I2C) |
| Timers | 2x 8-bit + 3x 16-bit |
| Low Power Feature | nanoWatt (multiple idle/sleep modes) |
| RoHS 状态 | Compliant |
PIC18LF45J10-I/P 引脚配置
| 引脚 1 | MCLR/RE3 — Master Clear (reset) input or digital input RE3 |
| 引脚 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| 引脚 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| 引脚 4 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC VREF- |
| 引脚 5 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| 引脚 6 | RA4 — Port A bit 4 |
| 引脚 7 | RA5/AN4 — Port A bit 5 / Analog input 4 |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | OSC1/RA7 — Oscillator input or Port A bit 7 |
| 引脚 10 | OSC2/RA6 — Oscillator output or Port A bit 6 |
| 引脚 11 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| 引脚 12 | RC1/T1OSI — Port C bit 1 / Timer1 oscillator input |
| 引脚 13 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 引脚 14 | RC3/SCL/SCK — Port C bit 3 / I2C SCL / SPI SCK |
| 引脚 15 | RC4/SDA/SDI — Port C bit 4 / I2C SDA / SPI SDI |
| 引脚 16 | RC5/SDO — Port C bit 5 / SPI SDO |
| 引脚 17 | RC6/TX/CK — Port C bit 6 / EUSART TX / EUSART clock |
| 引脚 18 | RC7/RX/DT — Port C bit 7 / EUSART RX / EUSART data |
| 引脚 19 | VSS — Ground reference |
| 引脚 20 | VDD — Positive supply voltage |
| 引脚 21 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| 引脚 22 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| 引脚 23 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| 引脚 24 | RB3/INT3/CCP2 — Port B bit 3 / External interrupt 3 / CCP2 |
| 引脚 25 | RB4 — Port B bit 4 |
| 引脚 26 | RB5 — Port B bit 5 |
| 引脚 27 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 28 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 29 | VSS — Ground reference |
| 引脚 30 | VDD — Positive supply voltage |
| 引脚 31 | RD0 — Port D bit 0 |
| 引脚 32 | RD1 — Port D bit 1 |
| 引脚 33 | RD2 — Port D bit 2 |
| 引脚 34 | RD3 — Port D bit 3 |
| 引脚 35 | RD4 — Port D bit 4 |
| 引脚 36 | RD5 — Port D bit 5 |
| 引脚 37 | RD6 — Port D bit 6 |
| 引脚 38 | RD7 — Port D bit 7 |
| 引脚 39 | RE0 — Port E bit 0 |
| 引脚 40 | RE1 — Port E bit 1 |
典型应用
PIC18LF45J10-I/P 适用于 6 应用s: Industrial Sensor Interface Node, Battery-Powered Portable Instrument, USB-to-UART Bridge (with external transceiver), HVAC Thermostat Controller, Educational Microcontroller Trainer Board, Automotive Aftermarket Accessory Module.
Industrial Sensor Interface Node
The PIC18LF45J10-I/P is well-suited for industrial sensor aggregation nodes that read 4-20 mA loops, thermistors, or digital sensors and forward data over RS-485. Its 32 KB Flash comfortably fits C-coded Modbus RTU slave stacks, while the 40 MHz core delivers deterministic scan rates above 1 kHz for multi-channel ADC sweeps. The 2.0V-3.6V supply range allows the node to run from a 3.3V LDO regulator; one EUSART can drive an RS-485 transceiver (e.g., MCP2551) while a second EUSART provides LIN support for sub-networks. The 32 I/O pins accommodate parallel sensor matrices and status LEDs without extra glue logic. Industrial temperature rating (-40C to +85C) handles factory-floor ambient. Engineers should add external ESD protection (TVS arrays) and a watchdog supervisor for unattended deployments.
推荐
Battery-Powered Portable Instrument
For handheld instruments running from two AA cells or a single Li-ion cell, the PIC18LF45J10-I/P's 2.0V-3.6V supply range eliminates the need for a boost converter. The PIC18 nanoWatt technology drops quiescent current into the microamp range during sleep, extending battery life by an order of magnitude versus always-on designs. The 10-bit ADC with internal voltage reference enables direct measurement of battery voltage without external parts. The 32 KB Flash is sufficient for USB-CDC class-emulation libraries (when paired with an external transceiver), while the 40 MHz core handles display refresh and button-debounce in real time. Designers should add a reverse-polarity protection FET on the battery input and a load-sharing circuit if USB charging is implemented.
推荐
USB-to-UART Bridge (with external transceiver)
Although the PIC18LF45J10-I/P lacks native USB, it can be paired with an external USB-to-UART bridge such as the MCP2200 or MCP2221 to provide a CDC-virtual-COM-port data path. The two EUSART peripherals simultaneously drive a debug console and a field-bus slave, leaving the MSSP ports free for SPI sensor chips. The 40 MHz instruction throughput sustains 921,600 bps UART traffic without bit-rate errors. The LF voltage range is exactly what 3.3V-only USB bridges require, so no level shifters are needed. A typical reference design dedicates one timer to the USB-suspend heartbeat and uses the ADC to monitor bridge supply voltage. Firmware can be upgraded via the bridge, eliminating ICSP header access in the field.
推荐
HVAC Thermostat Controller
The PIC18LF45J10-I/P's 10-bit ADC, 32 KB Flash, and 32 I/O pins make it a strong fit for HVAC thermostat controllers driving triac-based heater/cooler stages. The 2.0V-3.6V supply aligns with 24VAC-derived DC rails commonly found in thermostat back-plates. Two MSSP peripherals can run a graphical LCD and a wireless modem (e.g., sub-GHz transceiver) concurrently, while one EUSART supports service-port diagnostics. The nanoWatt sleep modes cut standby power below EnergyStar idle thresholds. Industrial temperature rating is essential for plenum-mounted designs. Engineers should debounce all mechanical inputs in software, add a hardware watchdog (e.g., MCP1316), and verify triac zero-crossing timing with an interrupt-on-change pin.
推荐
Educational Microcontroller Trainer Board
Educational labs benefit from the PIC18LF45J10-I/P's breadboard-friendly 40-pin PDIP package and Microchip's free MPLAB X IDE + XC8 toolchain. Students can experiment with timer interrupts, ADC sampling, PWM generation, and I2C sensor reads without surface-mount soldering. The 32 KB Flash supports realistic firmware projects such as small RTOS kernels and protocol stacks. The 40 MHz instruction rate is fast enough to demonstrate latency vs throughput trade-offs. The low-voltage 3.3V operation reduces the risk of accidental damage during lab exercises. Universities should bundle the device with a curriculum covering C programming, register-level peripherals, and a capstone UART-based data-logger project.
推荐
Automotive Aftermarket Accessory Module
Although not AEC-Q100 qualified, the PIC18LF45J10-I/P is widely used in non-safety automotive aftermarket accessories (interior lighting, gauge clusters, OBD-II readers) where the Industrial temperature grade suffices. The 32 KB Flash accommodates OBD-II P-code parsing libraries, while the dual EUSARTs can run LIN and a debug console simultaneously. The 2.0V-3.6V supply is compatible with 12V-buck-derived 3.3V rails, simplifying power tree design. A custom PWM module can drive RGB LED strips for interior ambient lighting, with the 10-bit ADC monitoring battery voltage. Engineers must add reverse-battery and load-dump protection (TVS + Schottky) on the supply input to survive the automotive electrical environment.
推荐
推荐产品汇总
工程参考数据： PIC18LF45J10-I/P ——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 | PIC18LF45J11-I/P | PIC18LF44J10-I/P | PIC18LF45K22-I/P | PIC18F45J10-I/P |
|---|---|---|---|---|---|
| Package | 40-pin PDIP | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 5.5 V |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM | 1024 bytes | 1024+ bytes | 1024 bytes | 1536 bytes | 1024 bytes |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 64 MHz | 40 MHz |
| I/O Pins | 32 | 32 | 32 | 35 | 32 |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| USB Support | No (external bridge required) | No | No | No | No |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial |
关键差异点
- Same 40-pin PDIP drop-in across the LF45J10, LF45J11, and LF45K22 families （对比 PIC18LF45K22-I/P)
- Native 2.0V-3.6V single-cell Li-ion operation without level shifters （对比 PIC18F45J10-I/P)
- Free professional toolchain with no commercial-license hassle （对比 Most ARM Cortex-M0 MCUs)
设计说明
Decouple each VDD/VSS pair with a 100 nF ceramic capacitor placed within 5 mm of the IC pins; add a bulk 10 uF tantalum or aluminum polymer cap at the regulator output. The PIC18LF45J10-I/P has multiple VDD pins (20 and 30); both must be powered. Operate strictly within 2.0V to 3.6V; voltages above 3.6V may permanently damage the Flash and analog peripherals.
Estimated: at 40 MHz, VDD=3.3V, all peripherals active, typical I_active is around 12 mA and I_sleep is around 0.1 uA (per Microchip datasheet 39682E typical curves). At 3.3V this yields about 40 mW active dissipation, well below the 1 W thermal limit of the 40-pin PDIP package, so no heatsink is required. For sleep-mode designs, ensure the Watchdog Timer is calibrated for the slowest wake interval to minimize average current.
Keep crystal traces short and symmetric; route OSC1/OSC2 over a continuous ground pour. If using an external crystal, place load capacitors within 3 mm of the OSC pins. Reserve a 6-pin ICSP header (MCLR, VDD, VSS, PGD, PGC) for in-circuit programming and debugging, even on production boards - this enables field firmware updates without desoldering the MCU.
Do not connect MCLR directly to VDD without a pull-up resistor; an external reset supervisor (e.g., MCP1316) is recommended for industrial environments to prevent code-execution errors during brown-out. When migrating from PIC16 to PIC18, remember the CONFIG bits are different and must be set explicitly; leaving them at default may lock the oscillator mode. Also ensure the IVT (Instruction Vector Table) is properly initialized before enabling interrupts.
合规信息
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C) indicated by 'I' suffix. Not AEC-Q100 qualified - choose AEC-Q100 PIC18 family variants for automotive safety applications.
