PIC18LF24K50-E/SS - 8-Bit 48MHz 16KB Flash USB MCU | Microchip
MPN： PIC18LF24K50-E/SS ✓ 啟用中PIC18LF24K50-E/SS 概覽
A PIC18 microcontroller is a member of Microchip's 8-bit advanced RISC architecture family, used where deterministic instruction execution, low cost, and a rich peripheral set (USB, ADC, PWM, I2C/SPI, UART) are required. PIC18 sits within the broader hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> semiconductor IC. The 'F' flash-based variants are the dominant contemporary PIC18 family, replacing older ROM/EPROM parts. The 'LF' sub-family adds the nanoWatt XLP sleep modes that drop current to tens of nanoamps, critical for battery-powered designs.
Key features include 25 digital I/O pins, a 10-bit ADC with up to 14 channels, two analog comparators, two 8-bit and one 16-bit timers, hardware USB 2.0 full-speed transceiver, and an internal 48 MHz oscillator that eliminates an external clock for USB. The 2048-byte RAM plus 16KB flash pairing is the typical balance for low-cost USB HID/CDC class devices, and the device's instruction set delivers up to 16 MIPS throughput.
Architecturally, the PIC18LF24K50 uses a modified Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. The integrated USB transceiver eliminates external USB PHY components, simplifying PCB routing and reducing BOM. The nanoWatt XLP technology includes multiple sleep modes (Idle, Sleep, Deep Sleep) and a real-time clock calendar mode that maintains timekeeping below 1 uA.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridge dongles, low-cost data loggers, and battery-powered sensor hubs. The wide operating voltage and low-power sleep modes make it particularly suitable for portable and wearable electronics.
When designing with this part, note that the integrated USB requires precise PCB layout for the D+/D- traces (90 ohm differential impedance, matched length) and a 1.5 kohm pull-up resistor on D+ for full-speed signaling. The 'LF' variant has a lower maximum VDD than the 'F' variant (3.6V vs 5.5V), which constrains use in 5V systems.
This page synthesizes distributor pricing, drop-in alternatives within the PIC18 K50 family, and PCB layout guidance that consolidates the manufacturer datasheet with practical design references.
直接替換替代品，適用於 PIC18LF24K50-E/SS — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF24K50-E/SS （相同外形與佔位） — 差異在於 Package, Program Memory (Flash), Timers, Mounting Type, Core Architecture.
PIC18F24K50-E/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K50-I/SS
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF24K50T-I/SS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC18F24K50-I/SS
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF24K50-E/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K50-E/SS 最大額定值與電氣特性
| Core Architecture | 8-bit PIC18 enhanced RISC (modified Harvard) |
| Program Memory (Flash) | 16 KB |
| Data RAM | 2048 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 48 MHz (16 MIPS) |
| Operating Voltage (VDD) | 1.8 V to 3.6 V |
| 工作溫度 | -40 C to +125 C (Extended, 'E' suffix) |
| I/O Pins | 25 |
| ADC | 10-bit, up to 14 channels |
| Comparators | 2 analog comparators |
| Timers | 2 x 8-bit, 1 x 16-bit |
| USB | USB 2.0 Full-Speed (12 Mbps) transceiver integrated |
| Communication | UART, I2C/SMBus, SPI, USB |
| Low-Power Technology | nanoWatt XLP (sub-uA sleep current) |
| 封裝 | 28-pin SSOP (5.30 mm body width, 'SS' suffix) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes (Pb-free) |
PIC18LF24K50-E/SS 腳位配置
| 腳位 1 | RA0/AN0/CV3P0 — Digital I/O / Analog input 0 |
| 腳位 2 | RA1/AN1/CV3P1 — Digital I/O / Analog input 1 |
| 腳位 3 | RA2/AN2 — Digital I/O / Analog input 2 |
| 腳位 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| 腳位 5 | RA4/AN4 — Digital I/O / Analog input 4 |
| 腳位 6 | RA5/AN5 — Digital I/O / Analog input 5 |
| 腳位 7 | VSS — Ground reference |
| 腳位 8 | RA7 — Digital I/O (RA7) |
| 腳位 9 | OSC1/CLKI/RA6 — Crystal input / External clock / Digital I/O |
| 腳位 10 | OSC2/CLKO/RA5 — Crystal output / System clock output / Digital I/O |
| 腳位 11 | RC0 — Digital I/O (RC0) |
| 腳位 12 | RC1 — Digital I/O (RC1) |
| 腳位 13 | RC2 — Digital I/O (RC2) |
| 腳位 14 | RC3 — Digital I/O (RC3) |
| 腳位 15 | RC4/D-/VMO — Digital I/O / USB D- / Digital monitor output |
| 腳位 16 | RC5/D+/VPO — Digital I/O / USB D+ / Digital monitor input |
| 腳位 17 | RC6 — Digital I/O (RC6) |
| 腳位 18 | RC7 — Digital I/O (RC7) |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply voltage |
| 腳位 21 | RB0/INT0 — Digital I/O / External interrupt 0 |
| 腳位 22 | RB1/INT1 — Digital I/O / External interrupt 1 |
| 腳位 23 | RB2 — Digital I/O (RB2) |
| 腳位 24 | RB3 — Digital I/O (RB3) |
| 腳位 25 | RB4 — Digital I/O (RB4) |
| 腳位 26 | RB5 — Digital I/O (RB5) |
| 腳位 27 | RB6/PGC — Digital I/O / ICSP clock |
| 腳位 28 | RB7/PGD — Digital I/O / ICSP data |
典型應用
PIC18LF24K50-E/SS 適用於 6 應用s: USB HID Peripherals (Keyboard, Mouse, Custom Input), USB-to-UART Bridge Dongles, Low-Power Battery Sensor Hubs, Industrial Data Loggers, Portable Medical Accessory Devices, Educational and Hobbyist Development Boards.
USB HID Peripherals (Keyboard, Mouse, Custom Input)
The PIC18LF24K50-E/SS is well suited for USB HID peripherals because it integrates a USB 2.0 Full-Speed transceiver supporting 12 Mbps signaling without an external PHY. The 48 MHz internal oscillator meets USB timing requirements without a crystal, reducing BOM cost. With 16 KB of flash and 2048 bytes of RAM, the device can host USB HID class descriptors, report buffers, and scan routines. The 25 digital I/O pins accept up to an 8x24 matrix keypad or scan chain. The 1.8-3.6 V VDD range suits 3.3 V native designs, while the SSOP-28 footprint is compact for handheld peripherals.
推薦
USB-to-UART Bridge Dongles
For USB-to-UART bridge dongles, the PIC18LF24K50-E/SS provides a hardware USB device port and an asynchronous EUSART peripheral that can be mapped to TX/RX pins with hardware flow control on CTS/RTS. The integrated USB transceiver eliminates the need for an external FTDI-style bridge chip, reducing system cost by USD 1-2 per unit. With 48 MHz of CPU bandwidth, baud rates up to 921600 are achievable with adequate interrupt priority. The 256-byte EEPROM can store dongle-specific configuration such as VID/PID pairs or serial-number overrides.
推薦
Low-Power Battery Sensor Hubs
The PIC18LF24K50-E/SS nanoWatt XLP technology delivers sub-uA current in deep-sleep modes with RTC active, making it ideal for battery-powered sensor hubs that spend most of their time asleep. The 14-channel 10-bit ADC handles multiple analog sensors with internal voltage reference, and the two analog comparators enable threshold-triggered wake-up without CPU intervention. The 1.8 V minimum VDD allows direct connection to single-cell Li-ion or 2xAA chemistries. The internal 31 kHz LFINTOSC maintains a real-time clock calendar at nanoamp-level current for time-stamped logging.
推薦
Industrial Data Loggers
The PIC18LF24K50-E/SS extended -40C to +125C operating temperature range qualifies it for industrial data logger installations. The 16 KB flash supports FAT12/16 file-system implementations for SD-card logging, and the 2048 bytes of RAM hold time-stamped sensor samples before flush. The MSSP peripheral interfaces to SPI-mode SD cards at up to 8 MHz. The 10-bit ADC samples analog process variables such as 4-20 mA loop current via a 250 ohm shunt, while the UART handles RS-485 communication with the MCP2551 transceiver for Modbus RTU networking.
推薦
Portable Medical Accessory Devices
The PIC18LF24K50-E/SS suits portable medical accessory designs where low power consumption and reliable USB connectivity are required for FDA-cleared peripherals. The integrated USB CDC class support enables plug-and-play serial communication with host PCs without driver installation on modern operating systems. The 10-bit ADC with internal bandgap reference provides traceable measurements of analog sensor channels, while the 256-byte EEPROM stores calibration coefficients and device identifiers. The 1.8-3.6 V VDD range matches Li-ion battery chemistries used in handheld medical devices.
推薦
Educational and Hobbyist Development Boards
The PIC18LF24K50-E/SS is a popular target for hobbyist and educational microcontroller projects because Microchip's free MPLAB X IDE, XC8 compiler, and MPLAB Snap debugger support the entire K50 family. The integrated USB and free Microchip Libraries for Applications (MLA) USB stack lower the learning curve. The SSOP-28 package is hand-solderable with practice and breadboard-friendly with SSOP-to-DIP adapters. The 16 KB flash and 2 KB RAM are sufficient for classroom projects such as USB thermometers, USB-controlled LED matrices, and USB-based function generators.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF24K50-E/SS — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F24K50-E/SS | PIC18LF24K50-I/SS | PIC18LF24K50T-I/SS | PIC18F24K50-I/SS | PIC18LF24K50-E/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SPDIP - same die, different footprint |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| RAM | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes |
| Operating Temperature | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| USB Module | USB 2.0 FS integrated | USB 2.0 FS integrated | USB 2.0 FS integrated | USB 2.0 FS integrated | USB 2.0 FS integrated | USB 2.0 FS integrated |
| Max CPU Speed | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) |
主要差異化特點
- Integrated USB 2.0 Full-Speed transceiver eliminates external PHY (對比PIC18LF24K42-I/SS)
- 1.8 V to 3.6 V VDD range with nanoWatt XLP extreme-low-power sleep (對比PIC18F24K50-E/SS)
- Extended -40C to +125C operating temperature grade (對比PIC18LF24K50-I/SS)
設計說明
USB Full-Speed operation requires the D+ and D- traces (pins 15 and 16, RC4 and RC5) to be routed as a 90 ohm differential pair with matched length. Per the Microchip datasheet section on USB layout, keep the differential pair over a continuous ground plane and place the 1.5 kohm pull-up resistor on D+ within 4 mm of the pin. Do not route digital switching signals across the differential pair to maintain the USB signal eye.
The PIC18LF24K50-E/SS operates from 1.8 V to 3.6 V on VDD (pin 20). Place a 100 nF decoupling capacitor within 3 mm of VDD, and a bulk 4.7 uF or 10 uF tantalum/ceramic capacitor near the VDD pin. For USB bus-powered designs, add a 4.7 uF bulk capacitor on the VBUS line ahead of the internal 3.3 V regulator to satisfy inrush current during USB enumeration. The VSS pins (7 and 19) must be tied to a low-impedance ground pour to minimize ground bounce.
Common pitfall: configuring the oscillator to use an external crystal while the 48 MHz HFINTOSC is sufficient for USB Full-Speed timing. The HFINTOSC eliminates two external load capacitors and a crystal, reducing BOM cost. Another pitfall: enabling the on-chip voltage regulator without waiting for the stable power-on delay can cause unreliable USB enumeration. Follow the datasheet power-on sequence and verify the CONFIG1L register settings before enabling USB.
The ICSP programming pins RB6/PGC (pin 27) and RB7/PGD (pin 28) should be accessible in production programming. Place a 2x3 or single-row header on the board edge near the ICSP pins, or route test pads. Use a 4.7 kohm pull-up on MCLR (pin 1 on other package variants; in SSOP-28 it is on the dedicated MCLR pin) for reliable in-circuit programming. Keep ICSP traces short, with the programming connector at most 50 mm from the MCU.
合規資訊
RoHS compliant per Microchip product page. Lead-free ('Pb-free') per package suffix. AEC-Q100 not qualified; for AEC-Q100 automotive designs use a designated automotive-grade PIC18 variant. REACH compliance per Microchip product declaration.
