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Brightking(台湾君耀)SMAJ440CA/TR13是一款双向瞬态抑制二极管(TVS),专为中高压电路的瞬态过压防护设计,采用SMA(DO-214AC)贴片封装,具备高可靠性、小体积等特点,广泛应用于工业控制、通信、电源等领域。
SMAJ440CA/TR13的核心作用是快速抑制电路中的瞬态过压脉冲(如静电放电、浪涌电压),将电压钳位在安全范围内,保护后级敏感元器件(如IC、MOS管、传感器等)不受损坏。
该器件的核心参数明确了其防护能力与适用范围,具体解析如下:
参数名称 典型值 意义说明 极性 双向 可同时防护正脉冲与负脉冲,无需额外配对管,简化电路设计 反向截止电压(Vₐᵣₘ) 440V 正常工作时器件处于截止状态的最大电压,需≥电路工作电压(如380V场景适配) 击穿电压(Vᵦ) 492V Vₐᵣₘ的1.12倍(TVS典型特性),电压超过此值时器件快速导通,启动防护 钳位电压(Vc) 713V 脉冲峰值时限制的最高电压,需≤后级器件最大耐压(如800V耐压器件可安全防护) 峰值脉冲电流(Ipp) 600mA 单次8/20μs脉冲波形下能承受的最大电流,决定防护强度 峰值脉冲功率(Ppp) 400W 脉冲功率容量,匹配实际应用中的瞬态功率需求 反向漏电流(Ir) 1μA 截止状态下的漏电流极小,不影响电路正常功耗SMAJ440CA/TR13符合IEC 61000-4-2静电放电防护标准,可有效抵御人体放电(HBM)、机器放电(MM)等静电冲击,同时对浪涌电压(如雷击、开关浪涌)具备一定抑制能力。
采用SMA(DO-214AC)贴片封装,尺寸为2.7mm×1.6mm×1.1mm(典型值),体积小、重量轻,适合高密度PCB布局,支持自动贴装(SMT)工艺,生产效率高。
为确保防护效果,应用时需注意以下几点:
Brightking SMAJ440CA/TR13是一款性能稳定、适配性强的双向TVS管,兼具小体积、高防护能力与宽温可靠性,适用于中高压电路的瞬态过压防护场景。其符合国际标准的防护性能与君耀的品牌可靠性,使其成为工业控制、通信、电源等领域的优选防护器件。
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