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SMBJ58A是单向瞬态抑制二极管(TVS),由江苏长电(CJ)生产,采用SMBG贴片封装,专为电路中的瞬态过压保护设计。其核心作用是在遇到雷击、静电放电(ESD)、开关浪涌等瞬态过压事件时,快速从截止态转为导通态,钳位尖峰电压至安全范围,避免后级敏感元器件(如MCU、传感器)受损。
SMBJ58A的参数针对中低压电路(58V级)优化,核心参数如下:
反向截止电压(Vrwm):58V
常态下器件可长期承受的最大反向工作电压,确保电路正常工作时不导通,不影响信号传输或电源效率。
击穿电压(Vbr):71.2V
过压保护的触发阈值——当反向电压超过此值时,TVS快速导通,将过压能量泄放至地,是“从截止到保护”的关键切换点。
钳位电压(Vc):93.6V
峰值脉冲电流下,TVS两端的最高电压,是后级电路可承受的保护上限。需确认后级器件耐压≥93.6V,以实现有效保护。
峰值脉冲电流(Ipp)与功率(Ppp):6.4A@10/1000μs、600W@10/1000μs
采用行业标准10/1000μs脉冲波形(上升沿10μs,半峰值时间1000μs),体现器件抗瞬态脉冲的能力,可应对典型浪涌(如雷击次级浪涌、开关切换浪涌)。
反向漏电流(Ir):5μA
常态下反向漏电流极小,可忽略不计,避免器件自身功耗影响电路整体效率。
工作温度范围:-55℃~+150℃
宽温特性覆盖工业级、汽车级严苛环境(如车载-40℃+125℃、工业-40℃+85℃),环境适应性强。
SMBJ58A采用SMBG贴片封装,属于SMB系列标准化封装,具有以下优势:
SMBJ58A的参数特性使其适用于以下场景:
SMBJ58A凭借单向保护、宽温范围、紧凑封装及可靠性能,成为58V级电路瞬态过压保护的优选器件,可有效提升电路抗干扰能力与长期可靠性。
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