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HGSEMI LM7812T
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM7812T
- Type
- HGSEMI
- Minimum package
- 1000 盒
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HGSEMI
- Electronic Component
- 75uV
- Electronic Component
- LM7812T
- Electronic Component
- 1
- Package
- TO-220
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 2.72g
- Electronic Component
- 1
- Electronic Component
- BM0227687399
- Operating Temperature
- 0℃~+125℃@(Ta)
- Operating Voltage
- 35V
- Output
- Electronic Component
- Output Voltage
- 12V
- Output Current
- 1.2A
- 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.
LM7812T（HGSEMI 华冠）线性稳压器 产品概述
一、产品概述
LM7812T 是一款固定输出的正极线性稳压器，输出电压为 12V，最大输出电流 1.2A，封装为常用的 TO-220。器件集成短路保护和过热保护，工作温度范围 0℃~+125℃（Ta）。最大工作电压可达 35V，电源纹波抑制比（PSRR）在 120Hz 时约为 55dB，典型噪声电平约 75μV，适合对纹波和噪声有一定要求的电源设计场景。
二、主要特性
- 固定 12V 输出，正极稳压器（单通道）
- 最大输出电流：1.2A
- 具备短路保护与过热（热关断）保护
- 工作电压最高 35V（输入端电压需高于输出加上足够的压差裕量）
- PSRR ≈ 55dB @ 120Hz，可显著抑制交流纹波
- 低噪声：约 75μV（典型）
- 常见 TO-220 封装，便于散热和安装
三、设计与热管理要点
线性稳压器的功耗主要由输入与输出电压差和负载电流决定：Pd = (Vin - Vout) × Iout。举例：
- 若 Vin = 15V，Iout = 1.2A，则 Pd ≈ 3V × 1.2A = 3.6W；
- 若 Vin = 24V，Iout = 1.2A，则 Pd ≈ 12V × 1.2A = 14.4W；
- 若 Vin = 35V（接近允许最大），Iout = 1.2A，则 Pd ≈ 27.6W（须强制散热）。
因此在中大电压差或高负载电流场合必须配备合适散热器；在空间或效率敏感的场合应考虑升降压转换器或预稳压以降低功耗。此外请参考器件数据手册确认最小输入-输出压差（dropout）和热阻参数。
四、外部元件与布局建议
- 输入侧建议并联 0.33μF 陶瓷或与型号数据表一致的旁路电容，用于抑制输入瞬变；
- 输出侧常用 0.1μF 陶瓷并联 10μF（或更大）电解/固态电容以稳定输出并改善瞬态响应与噪声；
- 布局时输入、输出及接地走线尽量短，输入/输出旁路电容靠近引脚放置；大电流回路截面积要足够，避免地环路噪声；
- 若使用绝缘垫片将 TO-220 与散热片隔离，请计算额外的热阻并适当增大散热片规模。
五、典型应用
- 工业控制模块与嵌入式电源
- 仪器仪表、传感器供电
- 通信与网络设备的辅助 12V 电源
- 对噪声和纹波有一定要求的模拟前端电源
六、选型注意与建议
在选用 LM7812T 时务必查看完整数据手册，确认最大输入电压、热阻、稳态与瞬态特性以及外部电容要求。若系统对效率或功耗要求高、输入-输出压差大或需更高输出电流，建议考虑开关稳压或低压差（LDO）方案。TO-220 封装便于加装散热片，合理的热设计是保障长期可靠性的关键。
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