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Jingdao Microelectronics SMBJ48A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic SMBJ48A
- Type
- Jingdao Microelectronics
- Minimum package
- 3000 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- SMBJ48A
- Electronic Component
- 1
- Package
- SMB
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.167g
- Electronic Component
- 1
- Cj- Capacitor
- 390pF
- Electronic Component
- BM0228055877
- Operating Temperature
- 65℃~+150℃
- Voltage
- 77.4V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 58.9V
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMBJ48A 产品概述
一、产品简介
SMBJ48A 是晶导微电子推出的一款高能脉冲瞬态电压抑制（TVS）二极管，采用 SMB 表面贴装封装，主要用于对电源线和信号线的浪涌、雷击及静电放电（ESD）等瞬态过电压进行快速钳位保护。器件响应迅速、耐冲击能力强，适用于工业、电力、通信及汽车电子等要求电压稳健性的场合。
二、主要参数
- 反向截止电压 Vrwm：48 V
- 击穿电压 Vbr（典型）：58.9 V
- 钳位电压 Vc：77.4 V
- 峰值脉冲电流 Ipp：7.8 A （10/1000 μs）
- 峰值脉冲功率 Ppp：600 W （10/1000 μs）
- 反向电流 Ir：1 μA（在 Vrwm 条件下）
- 结电容 Cj：约 390 pF
- 工作温度范围：-65 ℃ ～ +150 ℃
- 类型：TVS（二极管，A 表示常见单向型号）
- 封装：SMB（DO-214AA）
三、性能特点
- 高能量吸收能力：在 10/1000 μs 波形下可承受 7.8A 峰值电流及 600W 峰值功率，适合抑制工业和电力系统的长脉冲浪涌。
- 低漏电流：典型反向电流仅 1 μA，有利于降低静态功耗，适合对漏电敏感的电路。
- 有效钳位：钳位电压 77.4V 能在瞬态期间将电压限制在安全范围内，保护后端器件免受过压损坏。
- 宽工作温度范围：-65℃ 至 +150℃，适应艰苦环境和高温应用。
四、应用场景
- 开关电源、适配器的输入端浪涌保护
- 通信设备（PoE、电源线）及工业控制器的电源防护
- 汽车电子（非车身关键部位）、车载电源总线的浪涌抑制（注意车规要求）
- 配电箱、逆变器等对雷击、开关过电压敏感的场合
五、选型与使用建议
- 确认为单向还是双向型号：型号后缀“A”通常为单向 TVS，若需双向保护请选择对应型号。
- 注意工作电压匹配：Vrwm=48V 适用于 48V 级电源系统，务必保证常态电压低于 Vrwm，以避免持续击穿。
- 考虑结电容影响：390 pF 的结电容相对较大，不适合对高频或高速数据线（如高速串行接口）直接并联保护，否则会影响信号完整性。
- 热与能量管理：在频繁或高能冲击场合，应考虑器件热耗散与PCB散热设计，必要时并联或选用更高能量等级器件。
- PCB 布局：尽量将 TVS 放置在被保护端口附近、靠近外部连接器点，且走线最短以降低感抗和提升保护效率。
六、封装与焊接提示
SMB（DO-214AA）为常用表面贴装大功率封装，焊接时遵循无铅回流温度曲线，焊盘设计和热沉处理应参考厂商推荐的 PCB 尺寸和焊接指南，以保证可靠的焊点与散热性能。
结语：SMBJ48A 以其较高的脉冲能量吸收能力、低漏电和宽温度范围，适合用于 48V 级电源系统的浪涌保护。最终选型与布局请结合实际工况及完整数据手册进行验证。若需更详细的电气曲线、PCB 尺寸和可靠性数据，建议查阅晶导微电子的官方规格书。
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