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UMW TL431 (1%) TL431
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- UMW TL431(1%)
- Type
- UMW
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- UMW
- Electronic Component
- TL431(1%)
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- Voltage Reference IC
- Electronic Component
- ±1%
- Electronic Component
- 0.033g
- Electronic Component
- 1
- Electronic Component
- BM0264554910
- Operating Temperature
- 40℃~+85℃
- Output Current
- 100mA
- Output Type
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
- Current
- 250uA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TL431 (1%) — 可编程精密分流基准 概述
一、产品简介
UMW（友台半导体）出品的TL431 (1%) 是一款精度高、可调输出的三端可编程分流基准/误差放大器，采用SOT-23小封装，工作温度范围宽（-40℃～+85℃）。器件核心为2.495V 精密参考，初始精度±1%，可作为可调稳压、基准源和反馈误差放大器使用，最大阴极（输出）电流达100mA，最小阴极维持调节电流仅250µA，适合电池供电与低功耗系统应用。
二、主要特性
- 输出类型：可调（可编程分流基准）
- 参考电压：Vref ≈ 2.495V（典型）
- 精度：±1%（初始）
- 输出/阴极电流：最大 100mA，最小调节电流 250µA（保持调节）
- 工作温度：-40℃～+85℃
- 封装：SOT-23（小型化、易于贴片生产）
- 品牌：UMW（友台半导体）
三、典型电气公式与设计要点
- 输出电压设定（外接分压器）： Vout = Vref × (1 + R1/R2) + Iref × R1 其中Vref为内部参考（≈2.495V），Iref为参考端电流。设计时通常令Iref×R1对误差的影响可忽略，因此优先保证R1、R2阻值不过大以减小误差与噪声。
- 工作电流建议：器件在≥250µA下可维持调节，但为获得更佳热稳定性与响应性，建议典型工作阴极电流在1mA～20mA范围内，根据功耗与热限度调整。
- 功耗与热管理：SOT-23封装受限于封装散热，实际允许的最大功耗取决于电压降与电流。设计时应保证结温不超过额定值，并注意PCB散热设计。
四、典型应用
- 精密可调稳压源与参考电压源
- 开关电源误差放大器与光耦反馈回路
- 低压差线性稳压（与外部功率晶体管配合）
- 过压/欠压检测、阈值比较与电池管理
- 精密电流源或可编程限流电路
五、布局与使用建议
- REF引脚对噪声敏感，必要时在REF与阴极间接入小电容（几pF至几十nF）以改善瞬态与噪声，但需验证系统稳定性（避免振荡）。
- 分压电阻阻值建议不超过约100kΩ以抑制Iref对精度的影响并降低噪声。
- SOT-23封装建议短走线、预留散热铜箔，必要时增加邻近地铜以改善热阻与稳定性。
- 高电压差与高电流场合注意功耗计算与结温控制，可考虑使用外部通流晶体管分担功耗。
六、选型与可靠性
选择时请确认UMW提供的完整数据手册，关注温度漂移、长期漂移、瞬态响应与最小维持电流等参数。若应用对温漂或高温精度有严格要求，可参考厂方的详细温度特性曲线与失配规范。对于量产应用，建议与UMW工程支持沟通样品可靠性测试与封装识别。
如需，我可以根据您的目标电压、输入电源与负载条件，给出具体的外接电阻计算、样机电路和PCB布局建议。
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