WMSIC Electronic Components

TI LM431AIM3X/NOPB LM431AIM3X

ModelLM431AIM3X/NOPB
PackageSOT-23-3
BrandTI
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

20 specifications

Core information

Product name
TI(Texas Instruments) LM431AIM3X / NOPB
Type
SOT-23-3
Unit
Electronic Component
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
Electronic Component
Electronic Component
TI(Texas Instruments)
Electronic Component
LM431AIM3X/NOPB
Electronic Component
1
Package
SOT-23-3
Electronic Component
Voltage Reference IC
Electronic Component
±2.2%
Electronic Component
0.034g
Electronic Component
1
Features
Electronic Component
Electronic Component
BM0227790891
Operating Temperature
40℃~+85℃
Operating Voltage
2.44V~37V
Electronic Component
50ppm/℃
Output Voltage
2.44V~36V

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

LM431AIM3X/NOPB 产品概述

一、概述

LM431AIM3X/NOPB 是德州仪器(TI)推出的一款可调并联型(分流)电压基准/稳压芯片,采用 SOT-23-3 小封装,适合空间受限的高精度参考与简单线性稳压场景。器件工作温度范围为 -40℃ 至 +85℃(Ta),具有较低的温漂和较大的分流能力,适用于精密模拟电路与电源管理应用。

二、主要参数

  • 输出类型:可调(分流/并联型)
  • 基准电压(典型):约 2.44V
  • 工作电压范围:2.44V ~ 37V
  • 输出电压可调范围:2.44V ~ 36V
  • 输出电流(最大分流能力):100 mA
  • 精度:±2.2%
  • 温度系数:50 ppm/℃
  • 工作温度:-40℃ ~ +85℃(Ta)
  • 封装:SOT-23-3
  • 品牌:TI(德州仪器)

三、功能与工作原理

LM431A 是一款可调节的精密分流参考源,通过外接两个电阻构成分压网络来设定输出电压。常用公式为: Vout ≈ Vref × (1 + R2/R1)(在 Iadj 可忽略时),其中 Vref 约为 2.44V。器件通过吸收分流电流保持节点电压稳定,可用作单端参考、精密比较器的参考端或作为简单线性稳压元件。

四、典型应用

  • 开关电源的参考与误差放大器
  • 精密线性稳压与电压监控
  • 电池管理与充电控制电路
  • 仪表放大器与数据采集前端参考
  • LED 驱动电路的电压基准与限流参考

五、封装与热管理

SOT-23-3 封装便于表面贴装,但热阻相对较高。作为分流器件使用时,芯片会消耗由源电压与输出电压差产生的功率。设计时需计算芯片耗散 Pd ≈ (Vin − Vout) × Isink,确保在最大分流电流(100 mA)和工作电压下不超过封装允许的功耗限制,并采取合适的PCB散热与走线策略以避免过热。

六、使用建议

  • 在并联稳压配置中,务必在输入侧串联限流电阻以限制最大电流,避免器件过热或损坏。
  • 保证分压网络提供足够的最小工作电流(参照器件数据手册最低工作电流要求),以维持稳压精度。
  • 关键参考节点可并联小电容以抑制噪声与改善瞬态响应。
  • 考虑工作温度造成的漂移(50 ppm/℃)以及初始精度(±2.2%),在高精度系统中做校准或选择更高精度方案。
  • 控制 R 值以平衡功耗和噪声:较大阻值可降低静耗,但受 Iadj 影响需适当考虑。

七、总结

LM431AIM3X/NOPB 提供工业温度范围内的可调、低漂移基准与高达 100 mA 的分流能力,适合成本敏感且空间受限的精密参考与简单稳压场合。通过合理的外围电阻设计与热管理,可在多种电源与测量应用中实现稳定可靠的性能。欲获得更详细的极限参数与典型特性曲线,请参阅 TI 官方数据手册。

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