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东芝1SS357(TPH3,F)是一款超小型表面贴装肖特基势垒二极管,由日本东芝(TOSHIBA)研发生产,型号后缀“TPH3,F”为封装与批次标识。其定位为低功耗、小电流场景下的整流/开关核心元件,凭借紧凑的SC-70封装(SOT-323)和优异的电气特性,广泛适配便携电子、物联网传感器等对空间与功耗敏感的应用领域。
肖特基二极管的核心优势在于低导通损耗——相比普通硅二极管(典型700mV以上),1SS357在100mA工作电流下仅需600mV即可导通,大幅降低导通压降带来的能量损耗,尤其适合电池供电的低功耗设备,可延长单次充电续航时间。
40V的反向耐压满足绝大多数低压直流电路的安全需求(如3.3V、5V系统),避免反向电压击穿器件,保障电路稳定运行。
额定持续工作电流为100mA,适用于小电流路径(如信号整流、电源支路的辅助供电),需注意不可长期工作在超过100mA的电流下,否则会因过热导致器件失效。
反向漏电流仅5微安(在40V反向电压下),远低于普通二极管的漏电流水平,说明其反向截止特性优异,可减少反向功耗,同时避免对敏感信号电路造成干扰。
单次非重复情况下可承受1A的浪涌电流,能应对电路中偶尔出现的瞬间脉冲(如电源上电瞬间的尖峰),但需注意:若频繁出现1A以上浪涌,会降低器件寿命甚至直接损坏。
如智能手机、智能手环、蓝牙耳机等的小电流电源整流——SC-70封装节省PCB空间,低Vf减少电池能量损耗,完美适配设备的紧凑设计。
传感器节点通常由纽扣电池供电,1SS357的低功耗特性可降低电源转换损耗,延长节点的工作周期(无需频繁更换电池),同时小尺寸适配节点的微型化需求。
如信号检测、钳位电路中的整流元件——低反向漏电流避免信号失真,适合弱信号环境下的信号提取。
5V转3.3V等小功率DC-DC模块的输出整流管,满足100mA以内的输出电流需求,提升转换效率。
1SS357采用SC-70(SOT-323)表面贴装封装,属于超小型3引脚封装,引脚排列为:1脚(阳极)、2脚(阴极)、3脚(空脚,部分批次可省略)。封装材料为耐高温塑料,工作温度范围为**-55℃至125℃**(符合工业级与消费级设备的温度要求),支持自动贴装(SMT)工艺,适合大规模量产。
综上,东芝1SS357(TPH3,F)凭借“小尺寸、低功耗、高可靠性”的特点,成为低压小电流应用场景的优选肖特基二极管。
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