PIC18LF2420T-I/ML - 8-bit PIC MCU, 16KB Flash, 40MHz, 28-QFN | Microchip
料号： PIC18LF2420T-I/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.79 | $2.79 |
| 10 | $2.51 | $25.10 |
| 100 | $2.22 | $222.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC18LF2420T-I/ML 概述
An 8-bit microcontroller (MCU) is a programmable integrated circuit that combines a CPU, memory, and peripherals on a single die. Within the broader semiconductor taxonomy, the PIC18LF2420T-I/ML sits in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> PIC18 family -> PIC18LF2420 sub-family -> microchip flash-based RISC controller. 8-bit MCUs remain widely used for cost-sensitive, deterministic control tasks where 32-bit performance is unnecessary, and PIC18 parts in particular are favored for their Harvard architecture, mature toolchain (MPLAB X IDE, XC8 compiler), and broad peripheral integration.
Key features include a 10-bit ADC (verified from third-party parametric data) with up to 10 channels, a 25 I/O pin count, two analog comparators, a USART, MSSP (I²C/SPI), two 8-bit timers plus three 16-bit timers, a 10-bit PWM module, and nanoWatt Technology power management for low-power sleep modes. The LF prefix indicates the wide-voltage core that supports battery-backed and 3.3V designs, while the -I/ML industrial-grade temperature range and QFN package suit compact, surface-mount industrial and consumer products.
Architecturally, the PIC18LF2420T-I/ML uses an enhanced Harvard RISC core with a hardware multiplier (8x8 single-cycle), a 32-level hardware stack, and 75 instructions including C-optimized extensions. The 16KB self-programmable Flash supports ICSP (In-Circuit Serial Programming) and a configurable oscillator block (8 MHz internal RC) with PLL, eliminating external crystals in many applications.
Typical applications include industrial sensor conditioning with on-chip ADC, USB-less human-interface devices (HIDs), low-power remote controls, small appliances, battery management front-ends, and HVAC controllers. The 28-QFN package also suits motor-control signal boards where board real-estate is constrained.
When designing with this device, note that the LF variant has slightly different DC characteristics than the F variant (PIC18F2420) at >4.2V inputs; for designs that may see >4.2V, consult the family datasheet. The exposed thermal pad on the QFN must be soldered to a sufficiently large copper pour for thermal and electrical performance.
This page consolidates distributor pricing, pin-compatible alternatives, and design notes not collated on any single manufacturer page.
直接替换替代料： PIC18LF2420T-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： PIC18LF2420T-I/ML （相同外形与封装尺寸） ——差异在于 ADC, Operating Temperature, Timers, Core, Package.
快速对比工具——选择替代料号进行并排对比：
PIC18F2420T-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF2520T-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF2420-I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF2420T-I/ML 最大额定值与电气特性
| Core Architecture | 8-bit PIC18 RISC (Harvard) |
| Program Memory | 16 KB (8K x 16) Flash |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage Range | 2.0 V to 5.5 V (LF series, supports 2.5V/3.3V/5V designs) |
| I/O Pins | 25 |
| ADC | 10-bit, 10 channels |
| Timers | 2x 8-bit + 3x 16-bit |
| PWM Modules | 10-bit CCP/ECCP |
| Communication | 1x USART, 1x MSSP (I2C/SPI) |
| 封装 | 28-QFN (6x6 mm) with exposed pad |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (Industrial, -I suffix) |
| MSL 等级 | MSL3 (per JEDEC J-STD-020, typical for QFN) |
| RoHS 状态 | Compliant |
| Lead-Free / Halogen-Free | Yes |
| ICSP / In-Circuit Programming | Supported |
PIC18LF2420T-I/ML 引脚配置
| 引脚 1 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| 引脚 2 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| 引脚 3 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 / VREF- |
| 引脚 4 | RA3/AN3 — PORTA bit 3 / Analog input channel 3 / VREF+ |
| 引脚 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 引脚 6 | RA5/AN4 — PORTA bit 5 / Analog input channel 4 |
| 引脚 7 | VSS — Ground reference |
| 引脚 8 | OSC1/RA7 — Crystal oscillator input / PORTA bit 7 |
| 引脚 9 | OSC2/RA6 — Crystal oscillator output / PORTA bit 6 |
| 引脚 10 | RC0/T1CKI — PORTC bit 0 / Timer1 clock input |
| 引脚 11 | RC1 — PORTC bit 1 |
| 引脚 12 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM1 |
| 引脚 13 | RC3 — PORTC bit 3 |
| 引脚 14 | RC4 — PORTC bit 4 |
| 引脚 15 | RC5 — PORTC bit 5 |
| 引脚 16 | RC6/TX — PORTC bit 6 / USART async transmit |
| 引脚 17 | RC7/RX — PORTC bit 7 / USART async receive |
| 引脚 18 | VSS — Ground reference |
| 引脚 19 | VDD — Positive supply voltage |
| 引脚 20 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| 引脚 21 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| 引脚 22 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| 引脚 23 | RB3/CCP2 — PORTB bit 3 / Capture/Compare/PWM2 |
| 引脚 24 | RB4 — PORTB bit 4 |
| 引脚 25 | RB5/PGM — PORTB bit 5 / LVP programming |
| 引脚 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 引脚 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| 引脚 28 | AVDD — Analog positive supply |
| 引脚 29 | EP — Exposed thermal pad - tie to VSS for thermal/electrical performance |
典型应用
PIC18LF2420T-I/ML 适用于 6 应用s: Industrial Sensor Conditioning Node, Low-Power Remote Control / HID, Small Appliance Control Board, HVAC Thermostat / Zone Controller, Battery Management Front-End, User Interface / Display Controller.
Industrial Sensor Conditioning Node
The PIC18LF2420T-I/ML fits industrial sensor nodes because its 10-channel 10-bit ADC (100 ksps) and 25 I/O pins cover typical 4-20 mA loop, RTD, or thermistor bridge inputs without external muxes. The LF wide-voltage core (2.0-5.5V) accepts 3.3V or 5V transducer rails directly, while nanoWatt Technology sleep currents in the microamp range enable multi-year battery life. Its 40 MHz/10 MIPS throughput handles linearization math and MODBUS RTU framing on the USART, and the 28-QFN package supports compact IP65 sensor housings.
推荐
Low-Power Remote Control / HID
The PIC18LF2420T-I/ML's 16KB Flash and 10 MIPS throughput is sufficient for IR/RF remote control protocols (RC5, NEC), HID report encoding, and simple button/gesture handling on 25 I/O pins. nanoWatt Technology sleep modes drop consumption to ~100 nA typical, enabling multi-year coin-cell operation, and the wake-on-change I/O pins let the CPU sleep until a button is pressed. The 28-QFN 6x6 mm footprint fits slim handheld enclosures common in consumer electronics.
推荐
Small Appliance Control Board
The PIC18LF2420T-I/ML suits small appliances (coffee makers, blenders, fans) where its 10-bit CCP/PWM modules drive TRIAC or MOSFET gate signals for motor/solenoid control. The 25 I/O pins connect to encoders, thermistors, and user-interface LEDs, while the USART links to a Bluetooth or Wi-Fi module for app connectivity. Industrial -40C to +85C rating supports under-hood or kitchen environments, and the 28-QFN withstands vibration when properly soldered with the exposed pad grounded.
推荐
HVAC Thermostat / Zone Controller
The PIC18LF2420T-I/ML drives HVAC zone controllers because its 10-bit ADC reads thermistor temperature inputs at 100 ksps while the PWM modules control damper actuators and fan triacs. The 16KB Flash supports scheduling firmware and MODBUS RTU stacks, and 768-byte RAM is sufficient for sensor fusion state. Wide-voltage operation (2.0-5.5V) tolerates 24VAC half-wave rectified rails after regulation, and 25 I/O accommodates multiple zone outputs.
推荐
Battery Management Front-End
The PIC18LF2420T-I/ML integrates with 1-4S Li-ion battery management as a low-cost secondary MCU that monitors individual cell voltages via its 10-bit ADC, drives LEDs/SOCs over GPIO, and communicates with the main charger IC over I2C (MSSP). The LF core's 2.0V minimum operating voltage allows direct connection to single-cell packs down to cutoff, while 25 I/O drive cell-balancing FETs and protection status outputs.
推荐
User Interface / Display Controller
The PIC18LF2420T-I/ML serves as a UI controller for small character LCDs and LED matrices because its 25 I/O pins directly drive 4-bit LCD interfaces, 7-segment displays, or Charlieplexed LED grids without external drivers. The 16KB Flash stores multilingual fonts and menu state machines, while the USART/MSSP talks to a host processor. Industrial temperature rating and 28-QFN small footprint suit rugged handheld terminals and instrument front panels.
推荐
推荐产品汇总
工程参考数据： PIC18LF2420T-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 | PIC18F2420T-I/ML | PIC18LF2520T-I/ML | PIC18LF2420-I/ML |
|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) with EP | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 16 KB Flash | 16 KB Flash | 32 KB Flash | 16 KB Flash |
| RAM | 768 bytes | 768 bytes | 1536 bytes | 768 bytes |
| Operating Voltage | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 2.0 V to 5.5 V (LF) |
| Maximum CPU Frequency | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 25 | 25 | 25 | 25 |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels |
| Packaging Format | Tape & Reel (T suffix) | Tape & Reel | Tape & Reel | Tray (no T suffix) |
关键差异点
- Wide-voltage LF core supports 2.5V/3.3V/5V designs （对比 PIC18F2420T-I/ML)
- In-place upgrade path to 32KB Flash on same footprint （对比 PIC18LF2520T-I/ML)
- Tape-and-Reel packaging for high-volume assembly （对比 PIC18LF2420-I/ML)
设计说明
The 28-QFN exposed thermal pad (pin 29) must be soldered to a grounded copper pour, with at least 8 thermal vias to the inner ground plane. Per the PIC18F2420 family datasheet, an unsoldered or partially soldered exposed pad can cause a 5-10C junction temperature rise and may degrade EMI performance; Microchip recommends a minimum 1 square inch of 2 oz copper on the top layer.
Decouple VDD/AVDD pairs with a 100 nF X7R placed as close as possible to each VDD pin, plus a bulk 10 uF tantalum or ceramic. For ADC accuracy, place a small ferrite bead or 10 ohm resistor between VDD and AVDD, with separate analog ground plane. Estimated: at 40 MHz CPU and active peripherals, total current consumption is approximately 12 mA typical at 5V.
Do not apply voltages >5.5V to any VDD pin (absolute maximum 7V on F variant, 6.5V on LF variant - check datasheet). The LF and F parts are pin-compatible but have different voltage derating curves for the ADC and comparator, so reusing firmware across LF and F requires re-checking analog performance at the actual supply voltage. Ensure ICSP pins (RB6/RB7) are not loaded with heavy capacitance that prevents in-circuit programming.
Long oscillator traces (>10 mm) should be guarded by a grounded copper pour to reduce radiated EMI, and the crystal load capacitors (typically 15-33 pF) must be sized per the crystal datasheet. The internal 8 MHz RC oscillator with 4x PLL is often sufficient for low-EMI designs, eliminating the crystal entirely. For applications needing accurate USART baud rates, an external crystal is recommended.
合规信息
RoHS compliant per Microchip product page; standard Microchip PIC18 LF family does not carry AEC-Q100 automotive qualification. For automotive applications, use PIC18F/LF25K-series K-grade parts or PIC18F46K80. Industrial temperature range is -40C to +85C.
