Model & package intelligence
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HGSEMI LM2940S-5.0/TR LM2940S
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM2940S-5.0 / TR
- Type
- HGSEMI
- Minimum package
- 500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1V@(1A)
- Electronic Component
- HGSEMI
- Electronic Component
- 0.003%Vout
- Electronic Component
- LM2940S-5.0/TR
- Electronic Component
- 1
- Package
- TO-263-3L
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 2.308g
- Electronic Component
- 1
- Features
- Voltage
- Electronic Component
- BM0227715627
- Operating Temperature
- 40℃~+125℃
- Operating Voltage
- 26V
- Output
- Electronic Component
- Output Voltage
- 5V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM2940S-5.0/TR 产品概述
一、产品简介
LM2940S-5.0/TR 是一颗固定输出的线性低压差稳压器（LDO），额定输入电压可达 26V，输出为正极 5.0V，最大输出电流 1A。器件集成过压保护、短路保护及过热保护，适用于对噪声与电源纹波有较高要求的点位稳压场合。
二、主要性能特点
- 输出电压：5.0V（固定）；输出极性：正极
- 最大输出电流：1A；压差（Dropout）：1V @ 1A
- 电源纹波抑制比（PSRR）：60dB @ 120Hz
- 噪声：0.003% Vout（典型）
- 工作温度：-40℃ ~ +125℃
- 保护功能：过压保护、短路保护、过热保护
- 封装：TO-263-3L，单通道
三、电气与热设计要点
为了保证稳定工作，输入电压需比输出电压高出至少压差值（建议预留裕量），即输入电压应 ≥ 6V（典型条件下）。器件在高功耗条件下会产生热量，需根据功耗（Vin–Vout）× Iout 计算结温并设计合适的 PCB 散热铜箔或采用散热措施，确保不触发热关断。
四、外围元件与布局建议
建议在输入端并联合适的去耦电容以及在输出端配置低等效串联电阻（ESR）的储能/旁路电容，以保证稳压器稳定性与瞬态响应。尽量缩短输入/输出至地的回流路径，良好的地平面有助于降低噪声与提高纹波抑制效果。
五、典型应用场景
- 汽车与工业电源点位稳压（适配 12V/24V 总线，输入至 26V）
- 微处理器与数字电路的后级线性滤波与点位供电
- 模拟电路、传感器前端及低噪声放大器供电
- 通信设备、测试仪器与嵌入式系统
六、可靠性与选型注意
器件集成多重保护，提高系统容错能力，但在选型时仍需关注输入电压极限、最大功耗及工作温度曲线。长期高温工作会加速老化，建议在高负载情形下进行热仿真与实际测温验证。TO-263-3L 封装便于 PCB 安装与散热，但对散热铜厚与面积敏感，应在版图早期规划。
七、小结
LM2940S-5.0/TR 是一款面向 5V、1A 级别应用的固定输出 LDO，具备低压差、良好 PSRR 和极低噪声的特点，并带有完整保护功能，适合汽车、工业及对电源质量有较高要求的场合使用。正确的电源裕量设计、良好的旁路电容与合理的散热布局是确保长期稳定可靠工作的关键。
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