WMSIC Electronic Components

UMW TL431

ModelTL431
PackageSOT-23
BrandUMW
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 26+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
UMW TL431
Type
UMW
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
UMW
Electronic Component
TL431
Electronic Component
1
Package
SOT-23
Electronic Component
Voltage Reference IC
Electronic Component
±0.5%
Electronic Component
0.041g
Electronic Component
1
Electronic Component
BM0227161839
Operating Temperature
40℃~+85℃
Operating Voltage
2.495V~36V
Electronic Component
50ppm/℃
Output Voltage
2.495V~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.

UMW(友台)TL431 可调精密基准/分流稳压器产品概述

一、产品简介

UMW(友台)TL431 是一款输出可调、精度高、低静态电流的精密分流稳压器,封装为 SOT-23,适合开关电源反馈、线性基准、精密比较与电池管理等场景。其基准电压起始点为 2.495V,可在 2.495V ~ 36V 范围内输出可调电压,输出电流最高可达 100mA。

二、主要参数(重要指标)

  • 输出电压范围:2.495V ~ 36V(可调)
  • 精度:±0.5%(室温)
  • 温度系数:50 ppm/℃
  • 最大输出电流:100 mA
  • 最小阴极(工作)电流以保持稳压:250 μA
  • 静态电流(Iq):1.8 μA(典型,适合低功耗应用)
  • 工作电压范围:2.495V ~ 36V
  • 工作温度:-40℃ ~ +85℃
  • 封装:SOT-23

三、工作原理与设计要点

TL431 本质为可调精密参考源与误差放大器,外接两只分压电阻 R1(上)与 R2(下)即可设定输出电压:Vout ≈ Vref × (1 + R1/R2) + Iref×R1(Vref ≈ 2.495V)。设计时需注意:

  • 保证分压网络与负载共同使阴极电流不低于最低调节电流 250 μA,否则可能失去稳压。
  • 静态电流极低(约 1.8 μA),但当阴极流过较大电流时器件会发热,需计算实际功耗 Pd = (Vk - Va) × Ik,并评估 SOT-23 封装的散热能力。
  • 对于可能导致振荡的大电容性负载,可在 REF 到阴极间并联小电容(例如 10 nF)进行补偿,具体数值视电路稳定性测试而定。

四、典型应用

  • 开关电源反馈与精密参考(替代精密基准)
  • 线性稳压器及高压侧参考
  • LED 恒流源与电池充电管理
  • 过压/欠压检测与精密比较场合

五、使用建议与注意事项

  • 设计分压阻值时兼顾功耗与保证最低阴极电流:若希望低自耗,分压电阻总阻值可较大,但必须确保在最坏工况下仍有 ≥250 μA 流经器件。
  • 在高输出电压或大电流工作下要评估器件功耗并在 PCB 布局时增加散热铜箔或避免连续高温工作。
  • 100 mA 为器件极限输出电流,长时间接近极限可能引起热失效,推荐在实际设计中留安全裕量。
  • 对高速或噪声敏感场合,适当的旁路与滤波可以提升稳定性与抗干扰能力。

总结:UMW TL431 以其高精度(±0.5%)、低温漂(50 ppm/℃)和超低静态电流(1.8 μA)在众多精密参考与控制场合表现优异。设计时重点关注最低工作电流、功耗计算与电路稳定性即可发挥其最佳性能。

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