WMSIC Electronic Components

LRC LTL431ALT1G

ModelLTL431ALT1G
PackageSOT-23
BrandLRC
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 25+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
LRC LTL431ALT1G
Type
LRC
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
LRC
Electronic Component
LTL431ALT1G
Electronic Component
1
Package
SOT-23
Electronic Component
Voltage Reference IC
Electronic Component
±0.5%
Electronic Component
0.031g
Electronic Component
1
Electronic Component
BM0228587517
Operating Temperature
0℃~+70℃
Operating Voltage
2.487V~36V
Electronic Component
50ppm/℃
Output Voltage
2.5V~36V
Output Current
100mA
Output Type
Electronic Component

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

LTL431ALT1G 产品概述

一、产品简介

LTL431ALT1G(乐山无线电 LRC)是一款可编程精密电压基准/可调整流稳压器,输出类型可调,参考电压约为2.5V,输出电压范围2.5V ~ 36V,适用于需要稳定基准或可调稳压的低成本应用。器件以SOT-23三引脚封装提供,体积小、便于贴片组装。

二、主要特性

  • 输出电压范围:2.5V ~ 36V(工作电压2.487V ~ 36V)
  • 精度:±0.5%
  • 温度系数:50 ppm/℃
  • 最小维持调节的阴极电流:1 mA(即维持调节所需的最小Ika)
  • 最大阴极(吸收)电流能力:100 mA(注意功耗限制)
  • 工作温度(器件外壳环境Ta):0℃ ~ +70℃
  • 封装:SOT-23,三引脚(参考/阴极/阳极)

三、典型电路与计算

典型用法为与两只外部电阻组成分压器,实现可调输出。标准关系式:
Vout = Vref × (1 + R1/R2) + Iref × R1
其中Vref ≈ 2.5V,Iref 为参考端偏置电流(通常较小,可在精度计算中估计)。
示例:欲得到5.0V,可选R2=5 kΩ,则R1 = R2 × (Vout/Vref - 1) ≈ 5k × (5/2.5 -1) = 5kΩ。

四、应用场景

  • 开关电源或线性电源的精密参考与误差放大器
  • 可调恒流源、电池充电管理的基准与比较
  • 精密比较、基准电压源、DAC/ADC参考源
  • 电路保护与欠压/过压检测

五、封装与引脚

SOT-23 三引脚封装,功能为:参考端(REF)、阴极/输出(K)、阳极/地(A)。常见引脚排列为 1-REF,2-K,3-A(不同封装厂商排列略有差异,请以厂方数据手册为准)。

六、使用注意事项与热设计

  • 器件能吸收最高100 mA,但在高压差条件下功耗迅速上升:Pd = (Vin - Vout) × Ika。SOT-23散热能力有限,需避免单片在大电压差和大电流下长时间工作,可通过外接功率晶体管或采用分流电阻分担功耗。
  • 保证阴极电流不低于1 mA以维持稳压;为保证稳定,建议在调节区预留一定静态电流裕量(例如2~5 mA)。
  • 工作温度限制为0~+70℃,用于工业或高温环境需选择更高等级器件或降额使用。
  • PCB布局:REF端与分压电阻走线尽量短、旁边加旁路电容以抑制噪声;阴极散热铜皮适当加大。

七、订购信息与替代

品牌:LRC(乐山无线电),型号:LTL431ALT1G,封装:SOT-23。替代品可选常见TL431系列兼容器件,但在精度、温漂、最低调节电流和最大吸收电流等参数上需对比确认。购买和设计前请参阅厂方完整数据手册以获得引脚图、典型特性曲线和绝对最大额定值。

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