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HGSEMI LM317EMP/TR LM317EMP
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM317EMP / TR
- Type
- HGSEMI
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 40V@(1.5A)
- Electronic Component
- HGSEMI
- Electronic Component
- 0.003%Vout
- Electronic Component
- LM317EMP/TR
- Electronic Component
- 1
- Package
- SOT-223-4
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.348g
- Electronic Component
- 1
- Electronic Component
- BM0264249981
- Operating Temperature
- 0℃~+70℃@(Ta)
- Operating Voltage
- 40V
- Output
- Electronic Component
- Output Voltage
- 1.2V~37V
- Output Current
- 1.5A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM317EMP/TR 产品概述（HGSEMI 华冠）
一、主要规格与特性
LM317EMP/TR 为单通道正极可调线性稳压器，适用于中低功率稳压场合。主要参数如下：
- 输出极性：正极，输出可调范围 1.2V ~ 37V
- 最大工作电压（Vin）：40V，额定输入-输出压差可达 40V（在 1.5A 条件下）
- 最大输出电流：1.5A
- 静态电流 Iq：50μA（典型）
- 电源纹波抑制比 PSRR：65dB @ 120Hz
- 噪声：0.003%·Vout
- 保护功能：热关断、过流保护、短路保护
- 工作温度范围（Ta）：0℃ ~ +70℃
- 封装：SOT-223-4（便于散热和 PCB 安装）
- 输出类型：可调，通道数：1
二、性能亮点
- 低静态电流（50μA）适合对静态功耗敏感的便携或待机电源设计。
- 高 PSRR（65dB@120Hz）与超低噪声（0.003%Vout）对音频、电源参考及 ADC/DAC 供电非常有利，可显著降低纹波与基频干扰。
- 集成热关断与过流/短路保护，提高系统可靠性并简化外围保护电路设计。
- SOT-223-4 封装在中小功率场合提供良好散热与焊接便利。
三、典型应用场景
- 工业与消费类可调稳压电源
- 精密传感器、数据采集模块的低噪声供电
- 通信设备、射频模块的本地电源调节
- 电池供电系统的后段稳压或基准电源
四、设计与使用要点
- 输出电压设定：典型的调节公式为 Vout = Vref × (1 + R2/R1) + Iadj × R2，其中 Vref ≈ 1.2V，Iadj 可近似视作微安级。常见做法是选用 R1 ≈ 240Ω，以保证良好稳定性与调整精度。
- 热管理：在高电压差与大电流工况下，器件耗散功率显著，须配合铜箔散热或外挂散热片，确保结温低于安全限值。
- 布局建议：输入侧加足够旁路电容（低 ESR），输出侧靠近稳压器放置滤波与调整电阻，减少回路面积以提升 PSRR 与降低噪声耦合。
- 保护与启动：尽管内置保护电路，建议在系统级加入熔断、限流或软启动措施以应对异常负载或输入瞬变。
五、封装与可靠性
SOT-223-4 提供四引脚布局，便于焊接与散热处理。在 PCB 设计时可在器件下方与引脚相连铜区域增加热沉面积或通过热盲孔与散热层连接，提高长期可靠性。器件在额定环境（0℃~+70℃）内工作可靠，工业级或广温产品可根据需要另行咨询。
LM317EMP/TR 综合了低噪声、高 PSRR 与完整保护特性，适合需要稳定、可调输出且关注可靠性的电源设计。
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