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Brightking(台湾君耀)作为全球知名的过压保护器件厂商,其331KD05属于径向引线式氧化锌压敏电阻,核心定位为中高压电路的浪涌防护,适配长期工作电压为275V DC/210V AC的场景,广泛应用于家电、工业控制、照明等领域。君耀的压敏电阻以一致性好、可靠性高著称,331KD05延续了品牌的技术优势,是中高压电源防护的经典选型之一。
压敏电阻的核心性能由电气参数决定,331KD05的关键参数及实际意义如下:
压敏电压(297V~363V)
指器件在1mA测试电流下的电压值,公差±10%(以标称330V为基准)。该参数是器件的“触发阈值”——当电路电压超过此范围时,压敏电阻的电阻急剧下降,从高阻态转为低阻态,从而分流浪涌电流。
工作电压(DC275V/AC210V)
长期连续工作时允许的最大电压,需注意DC与AC参数不可混淆:AC210V对应220V市电的典型波动范围(实际市电峰值约311V,远低于压敏电压阈值),DC275V适配直流电源系统的长期工作场景。
钳位电压(570V)
浪涌发生时,器件能将电路电压钳位到的最大值(测试条件为额定浪涌电流)。该参数直接决定防护效果——若系统允许的最大电压不低于570V,331KD05可有效抑制浪涌对后级电路的冲击。
浪涌耐受能力(400A峰值/9.5J能量)
静态电容(75pF@1kHz)
器件的寄生电容,75pF属于中高压压敏电阻的低电容范围,可减少对高频信号的干扰,适合对电容敏感的电源电路(如LED驱动、通讯电源)。
静态功率(100mW)
正常工作时的功耗,低功耗意味着器件发热小,长期可靠性高,可降低老化失效风险。
331KD05采用径向引线封装,具有以下特点:
331KD05的参数适配性使其在多个领域成为优选:
综上,Brightking 331KD05是一款性能均衡、可靠性高的中高压压敏电阻,适用于大多数需要浪涌防护的电源电路,是工程选型中常用的经典型号。
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