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TWGMC 79L12 Voltage Regulator 79L12
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TWGMC 79L12
- Type
- TWGMC
- Minimum package
- 1000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- 1.7V
- Electronic Component
- TWGMC
- Electronic Component
- 80uV
- Electronic Component
- 79L12
- Electronic Component
- 1
- Package
- SOT-89
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 0.145g
- Electronic Component
- 1
- Electronic Component
- BM0225962487
- Operating Temperature
- 0℃~+150℃@(Tj)
- Operating Voltage
- 35V
- Output
- Electronic Component
- Output Voltage
- 12V
- Output Current
- 100mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
79L12 负固定线性稳压器（TWGMC / SOT-89）产品概述
一、主要特性
- 品牌：TWGMC（台湾迪嘉）
- 输出类型：固定（负极） — 输出电压 -12V
- 输出电流：最大 100mA
- 静态电流（Iq）：典型 6.5mA
- 压差（Dropout）：1.7V（最小输入电压需比输出更负至少 1.7V）
- 工作电压范围：最高 35V
- 工作温度（结温 Tj）：0℃ ~ +150℃
- 电源纹波抑制比（PSRR）：42dB @ 120Hz
- 输出噪声：80µV（典型）
- 输出通道数：1 通道
- 封装：SOT-89（小体积、低外形高度）
二、功能与性能概述
79L12 为一款固定输出的线性负电压稳压器，提供稳定的 -12V 直流电源，适用于中低功率的负电源需求场合。典型静态电流仅 6.5mA，有利于降低空载功耗；在满载 100mA 条件下仍能维持良好的输出稳定性。对工频或整流残余的抑制能力为 42dB（120Hz），配合输出噪声仅 80µV，可满足普通模拟与混合信号电路对负电压源的要求。
三、电气设计要点与使用建议
- 输入电压要求：由于压差 1.7V，输入电位必须比 -12V 更负至少 1.7V（建议留有裕度，例如 Vin ≤ -14V 可保证稳定工作）。同时，输入与输出之间的最大压差不得超过器件允许的工作电压（见规格，最高 35V）。
- 功耗与散热：功耗 Pd ≈ (|Vin| - |Vout|) × Iout + Iq × |Vin|。在 SOT-89 小封装上散热能力有限，长期满载或输入-输出电压差较大时需在 PCB 上扩展散热铜箔或采取热管理措施，避免结温过高影响可靠性。
- 旁路与滤波：为保证稳定与低噪声输出，建议在输入端靠近管脚放置去耦电容（例如 0.1µF 陶瓷并联一个 4.7–10µF 电解/钽电容），输出端同样使用陶瓷 + 电解并联以抑制瞬态与降低输出阻抗。对特别敏感的模拟前端，可在输出再做 RC / LC 额外滤波。
- 稳定性：线性稳压器通常对外接电容的 ESR 有要求，实际电路中应参考器件完整资料（datasheet）以选择合适的输出电容类型与等效串联电阻，确保环路稳定。
四、典型应用场景
- 运放与模拟前端需要的负电源（±12V 系统中的负半部分）
- 仪表放大、传感器供电与数据采集系统中的低噪声负电源
- 通信设备、小型工业控制器中的局部负电压稳压
- 便携或空间受限设备，利用 SOT-89 小封装节省 PCB 面积
五、选型与注意事项
- 若系统需更大输出电流（>100mA）或更小压差，应考虑更大功率封装或低压差（LDO）器件。
- 在高纹波或高噪声环境下（如靠近开关电源），尽管本器件 PSRR 为 42dB，仍建议在输入端增加滤波或使用预稳压/滤波级以提高整机性能。
- 在高温或高压差场合，评估结温和长时间可靠性尤为重要，必要时在设计早期做热仿真与实测。
总结：TWGMC 79L12（SOT-89）是一款适用于中小功率负电压场景的固定线性稳压器，具有低噪声、中等 PSRR 与简单外围要求的优点。合理控制输入-输出电压差并做好 PCB 散热与去耦设计，可在模拟与工业控制等多种应用中提供稳定的 -12V 电源。
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