PIC18LF4420-I/PT - 8-bit 40MHz MCU 16KB Flash 44-TQFP | Microchip
料号： PIC18LF4420-I/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.4 | $8.40 |
| 10 | $7.56 | $75.60 |
| 100 | $6.72 | $672.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.71 | $5,710.00 |
PIC18LF4420-I/PT 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O into one package. The PIC18 family is Microchip's enhanced 8-bit architecture that sits between the baseline PIC16 family and the 16-bit dsPIC family. Within this hierarchy, the PIC18LF4420 belongs to the PIC18F4420 sub-family, which targets general-purpose embedded control with on-chip 10-bit ADC, multiple timers, and communication peripherals.
Key features include 36 digital I/O pins, a 10-bit ADC with up to 13 input channels, two capture/compare/PWM modules, two USART modules, an SPI/I2C master/slave MSSP peripheral, and a 13-channel ADC. The device supports in-circuit serial programming (ICSP) and in-circuit debugging via two program/debug pins, enabling direct flash programming on the assembled PCB without removing the device.
The PIC18LF4420-I/PT employs an enhanced Harvard architecture with a 16-bit instruction word and 8-bit data path, achieving 200ns minimum instruction execution at 40MHz. Internal Phase-Locked Loop (PLL) support and an internal 31kHz to 8MHz oscillator reduce external component count, while the nanoWatt technology provides multiple power-managed modes (Idle, Sleep) for battery-powered applications.
Typical applications include industrial control panels, automotive body electronics (non-safety), sensor node interfaces, HVAC controllers, low-power remote controls, and consumer white goods. The wide 2.0V to 5.5V operating range supports both 3.3V and 5V system designs.
When designing with this device, ensure decoupling capacitor placement (100nF) close to VDD pins and that MCLR is pulled high through a resistor for normal operation. The 44-TQFP package has a relatively large 10x10 mm footprint - if board space is critical, consider the QFN-package variant PIC18LF4420-I/ML.
This page synthesizes distributor pricing, drop-in PIC18F/LF family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： PIC18LF4420-I/PT ——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： PIC18LF4420-I/PT （相同外形与封装尺寸） ——差异在于 Package, Timers, Core Architecture, Operating Temperature, CCP Modules.
快速对比工具——选择替代料号进行并排对比：
PIC18F4420-I/PT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC18LF4520-I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.21 / 个
查看数据手册 →PIC18F4520-I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.05 / 个
查看数据手册 →PIC18LF4320-I/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.9 / 个
查看数据手册 →PIC18LF4420-I/PT 最大额定值与电气特性
| Core Architecture | PIC18 (8-bit RISC, enhanced Harvard) |
| CPU Core | PIC18 (16-bit instruction, 8-bit data) |
| 最大时钟频率 | 40 MHz (10 MIPS) |
| Program Memory Type | FLASH |
| Program Memory Size | 16 KB (8K x 16 words) |
| RAM Size | 768 bytes |
| EEPROM Size | 256 bytes |
| Supply Voltage Range | 2.0 V to 5.5 V |
| 工作温度范围 | -40C to +85C (Industrial) |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Timers | 4 (Timer0, Timer1, Timer2, Timer3) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Communication | 1x MSSP (SPI/I2C), 1x USART (EUSART) |
| 封装 | 44-pin TQFP (PT) 10x10 mm |
| 安装类型 | Surface Mount |
| MSL 等级 | 3 (168 hours) |
| RoHS 状态 | Compliant |
PIC18LF4420-I/PT 引脚配置
| 引脚 1 | MCLR — Master Clear (Reset) input, active low |
| 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/T0CKI — Port A bit 4 / Timer0 clock input |
| 引脚 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI Slave Select |
| 引脚 8 | RE0/RD/AN5 — Port E bit 0 / Parallel port Read / Analog input 5 |
| 引脚 9 | RE1/WR/AN6 — Port E bit 1 / Parallel port Write / Analog input 6 |
| 引脚 10 | RE2/CS/AN7 — Port E bit 2 / Parallel port Chip Select / Analog input 7 |
| 引脚 11 | VDD — Positive supply voltage |
| 引脚 12 | VSS — Ground reference |
| 引脚 13 | OSC1/CLKI/RA7 — Oscillator input / External clock / Port A bit 7 |
| 引脚 14 | OSC2/CLKO/RA6 — Oscillator output / Clock output / Port A bit 6 |
| 引脚 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| 引脚 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 output |
| 引脚 17 | RC2/CCP1 — Port C bit 2 / CCP1 output |
| 引脚 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| 引脚 19 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| 引脚 20 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| 引脚 21 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| 引脚 22 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| 引脚 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| 引脚 24 | RC5/SDO — Port C bit 5 / SPI data out |
| 引脚 25 | RC6/TX/CK — Port C bit 6 / EUSART TX / EUSART clock |
| 引脚 26 | RC7/RX/DT — Port C bit 7 / EUSART RX / EUSART data |
| 引脚 27 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| 引脚 28 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| 引脚 29 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| 引脚 30 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| 引脚 31 | VSS — Ground reference |
| 引脚 32 | VDD — Positive supply voltage |
| 引脚 33 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| 引脚 34 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| 引脚 35 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| 引脚 36 | RB3/INT3/CCP2 — Port B bit 3 / External interrupt 3 / CCP2 alternate |
| 引脚 37 | RB4 — Port B bit 4 |
| 引脚 38 | RB5 — Port B bit 5 |
| 引脚 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 40 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 41 | VSS — Ground reference (additional) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | AVDD — Analog positive supply (connect to VDD if ADC unused) |
| 引脚 44 | AVSS — Analog ground (connect to VSS if ADC unused) |
典型应用
PIC18LF4420-I/PT 适用于 6 应用s: Industrial Control Panels, HVAC Thermostat Controllers, Automotive Body Electronics, Sensor Node / Data Logger, Consumer White Goods, Battery-Powered Remote Controls.
Industrial Control Panels
The PIC18LF4420-I/PT fits industrial control panels due to its 36 I/O pins, 13-channel 10-bit ADC, and 2.0V-5.5V supply tolerance that withstands 24V-sourced rails with LDO regulation. Its 40MHz CPU executes PLC-style logic within sub-microsecond response times, while the 16KB FLASH supports ladder-logic-to-C translation libraries. The -40C to +85C industrial temperature rating meets IEC 61131-2 panel environment specs.
推荐
HVAC Thermostat Controllers
HVAC thermostats benefit from the PIC18LF4420-I/PT's nanoWatt sleep modes and 2.0V minimum supply, enabling multi-year battery life on 2xAA cells. Its 13-channel ADC handles NTC thermistor inputs for indoor/outdoor/coil temperature sensing, while the CCP modules drive triac-controlled blower and compressor stages. The 16KB FLASH accommodates wireless protocol stacks (Zigbee sub-GHz, BLE) with room for application code.
推荐
Automotive Body Electronics
Non-safety automotive body modules such as seat controllers, mirror adjusters, and lighting drivers use the PIC18LF4420-I/PT for its 40MHz CPU and CAN-friendly EUSART peripherals. While not AEC-Q100 qualified, the -40C to +85C temperature range covers most passenger-compartment applications. Its 36 I/O pins handle multiple motor H-bridges and LED matrix drivers without external MUX.
推荐
Sensor Node / Data Logger
Wireless sensor nodes leverage the PIC18LF4420-I/PT's sub-microamp sleep current and 13-channel ADC to poll multiple sensors (temperature, humidity, pressure) over extended periods. The SPI MSSP interfaces directly to LoRa or sub-GHz transceivers, while the EUSART provides RS-485 wired connectivity. The 768-byte RAM buffers sensor data between wake cycles, and 16KB FLASH fits custom protocol stacks plus calibration tables.
推荐
Consumer White Goods
Washing machines, dishwashers, and microwave ovens employ the PIC18LF4420-I/PT for user-interface control with keypad scanning, LCD driving via MSSP, and triac-controlled motor actuation. The 2.0V-5.5V supply handles rectified mains with simple LDO regulation. The 16KB FLASH supports graphical UI bitmaps and appliance-state machines, while 768 bytes RAM holds UI buffers during display updates.
推荐
Battery-Powered Remote Controls
RF remote controls benefit from the PIC18LF4420-I/PT's 2.0V minimum supply that operates from a single CR2032 cell (3V nominal) down to 2V end-of-life. The EUSART/MSSP drives sub-GHz or BLE SoCs via SPI, and nanoWatt sleep modes extend coin-cell life to multi-year durations. The 16KB FLASH accommodates user-customizable button mapping and IR/RF protocol libraries.
推荐
推荐产品汇总
工程参考数据： PIC18LF4420-I/PT ——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 | PIC18F4420-I/PT | PIC18LF4520-I/PT | PIC18F4520-I/PT | PIC18LF4320-I/PT |
|---|---|---|---|---|---|
| Package | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm | 44-TQFP (PT) 10x10 mm |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 16 KB FLASH | 16 KB FLASH | 32 KB FLASH | 32 KB FLASH | 8 KB FLASH |
| Supply Voltage | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
| Maximum Clock | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| RAM | 768 bytes | 768 bytes | 1536 bytes | 1536 bytes | 512 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Lower minimum supply voltage for battery-powered designs （对比 PIC18F4420-I/PT)
- Lower quiescent current in sleep mode （对比 PIC18F4420-I/PT)
- Smaller package footprint variant available （对比 PIC18LF4420-I/PT (this part))
设计说明
Place 100nF decoupling capacitors as close as possible to each VDD pin (pins 11, 32) and a bulk 10uF tantalum or ceramic capacitor at the VDD rail entry. The PIC18LF4420-I/PT draws brief high-current spikes during FLASH programming/erase operations - inadequate decoupling leads to programming failures or runtime glitches. Add a 10uF + 100nF combination at the regulator output if powering from a switching converter.
The 44-TQFP package requires careful PCB layout to support ICSP (In-Circuit Serial Programming) and ICD (In-Circuit Debugging). Route the PGD (pin 40) and PGC (pin 39) signals with short, direct traces to a 6-pin header placed at the board edge. The MCLR pin (pin 1) must have a 10kohm pull-up to VDD and a 100nF cap to ground for in-circuit debug stability - never leave MCLR floating.
Do not confuse the LF (low-voltage) variant with the F variant - the LF supports 2.0V minimum but the F requires 4.2V minimum. If migrating a PIC18F4420 design to PIC18LF4420, no software changes are required, but verify the brown-out and voltage regulator configuration bits match the new supply range. The configuration bits are at FLASH address 0x300000 and 0x300001 and must be set correctly to enable the internal oscillator and disable the watchdog if not used.
When using the external oscillator (HS or XT mode), keep the crystal traces short and surround them with a ground pour to minimize EMI. For the internal 8MHz oscillator (default after factory reset), no external components are needed but the frequency tolerance is +/- 2% over temperature. For USB or UART applications requiring tight baud-rate accuracy, use a crystal with the HS PLL mode or switch to an F4520 with internal PLL.
合规信息
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive safety applications consider dsPIC33 or PIC18 K-series AEC-Q100 qualified parts.