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SMCJ28A/TR13是台湾君耀(Brightking)推出的单向瞬态抑制二极管(TVS),属于过压保护器件范畴,专为电子电路中的静电放电(ESD)、雷击感应浪涌、开关瞬态脉冲等异常过压场景设计,可快速将过压钳位至安全范围,避免后端敏感元器件(如MCU、传感器、存储芯片等)因过压损坏。
型号标识解析:
该器件的核心参数需结合过压保护逻辑理解,具体如下:
单向设计,仅对单一方向过压(如电源正极→地)起保护作用:正常工作时反向截止,过压触发后进入雪崩击穿导通,瞬间泄放浪涌电流。
电路正常工作时可长期承受的最大反向电压,确保无导通漏电流(或极低漏电流),适配5V/12V等低中压电源系统(正常工作电压远低于28V)。
器件触发导通的阈值电压:当反向电压超过此值时,器件从截止态快速转为导通态,启动过压保护(无持续损坏风险)。
导通后可将过压钳位的最高电压,是保护效果的核心指标——后端器件(如普通MCU)耐压多为50V以上,完全适配该钳位范围。
单次瞬态脉冲可承受的最大功率,由钳位电压与峰值脉冲电流共同决定((V_c \times I_{pp} \approx 45.4V \times 33.1A \approx 1500W)),覆盖IEC 61000-4-5标准中多数浪涌场景(如2kV/2Ω浪涌功率约2000W,1.5kW满足主流需求)。
Vrwm下的反向电流,数值极小(微安级),确保正常工作时器件功耗可忽略,不影响电路效率。
采用SMC(DO-214AB)贴片封装,具备以下优势:
Brightking(君耀)是全球知名过压保护厂商,SMCJ28A/TR13具备以下可靠性优势:
结合参数与封装特点,该器件广泛应用于:
SMCJ28A/TR13以紧凑封装、1.5kW脉冲功率、低漏电流等特点,成为中低压电路过压保护的高性价比选择,适配多数电子设备的可靠性需求,是消费电子、工业控制等领域的常用保护器件。
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