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HGSEMI LM7809T
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM7809T
- Type
- HGSEMI
- Minimum package
- 50 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HGSEMI
- Electronic Component
- 57uV
- Electronic Component
- LM7809T
- Electronic Component
- 1
- Package
- TO-220
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 2.705g
- Electronic Component
- 1
- Electronic Component
- BM0264801283
- Operating Temperature
- 20℃~+80℃@(Ta)
- Operating Voltage
- 35V
- Output
- Electronic Component
- Output Voltage
- 9V
- Output Current
- 1A
- 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.
LM7809T 产品概述
一、产品简介
LM7809T（HGSEMI/华冠）为经典的三端线性稳压器，提供固定正极9V、最大输出电流1A的稳压输出，适用于各类家电、消费电子、测试仪器和一般电子设备的局部电源供应。器件采用带散热片的塑料封装，常见封装形式为TO-220（T 后缀）和TO-263，可方便地通过外加散热片或底板散热以满足不同功率需求。
二、主要电气参数
- 输出电压：9V（固定）
- 输出电流：1A（最大）
- 最大工作电压（输入）：35V（请参照数据手册确定实际最高允许输入）
- 输出极性：正极（正向稳压器）
- 电源纹波抑制比（PSRR）：56dB @ 120Hz
- 输出噪声：约57µV（典型）
- 工作温度范围：-20℃ ～ +80℃（Ta）
- 输出通道数：1（单路）
三、功能与保护特性
- 短路保护：内部限流设计，可在过载或输出短路时限制电流，保护器件及负载。
- 热关断（过热保护）：当结温超过安全阈值时自动关断，待温度恢复后再恢复工作。
- 内部稳压与起振抑制设计，适合于典型线性稳压应用。
四、热管理与封装建议
线性稳压器的功耗等于 (Vin − Vout) × Iout，需根据工况计算功耗并选择合适散热措施。示例：若Vin=12V、Vout=9V、Iout=1A，则器件耗散约3W，此时通常需要外加散热片或使用更低热阻的封装（如TO‑263）并注意PCB铜箔散热。建议在高电压差或大电流应用中进行热仿真或按安全裕度选择散热方案。
五、典型应用与设计注意事项
- 适用场景：电视、收录机、音频设备、电源模块、仪器仪表等需要稳定9V电源的场合。
- 输入电压须高于输出电压并保留足够差压以保证稳压（请参考器件最小输入‑输出压差指标）。
- 为保证稳定性及抑制瞬态/纹波，建议在输入和输出端按数据手册配置旁路/滤波电容。
六、典型外接电路建议
- 常见建议：在输入端并联一只0.33µF（陶瓷或薄膜）去耦电容，输出端并联0.1µF陶瓷及10µF左右电解电容以提高瞬态响应和抑制振荡。
- PCB 布局：输入电容靠近引脚放置，输出电容靠近输出引脚与地短回路；地线尽量独立回流，减小环路面积以降低噪声与干扰。
- 若需更低噪声或更高纹波抑制，可在输出后增加后级滤波或使用低噪声后端稳压/参考源。
总结：LM7809T（华冠）为可靠的单路固定9V线性稳压器，具备短路保护与热关断功能，PSRR和噪声性能适合多数中低功率模拟与数字电源场景。设计时重视输入电压裕度与热管理，按数据手册配置去耦电容与散热方案，可以获得稳定可靠的电源输出。
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