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BORN SMAJ85A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BORN SMAJ85A
- Type
- BORN
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BORN
- Electronic Component
- SMAJ85A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.127g
- Electronic Component
- 1
- Electronic Component
- BM0264491103
- Voltage
- 137V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 104V
- Electronic Component
- Electronic Component
- Electronic Component
- 5000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMAJ85A 产品概述
一、产品简介
SMAJ85A 是 BORN（伯恩半导体）推出的一款单向 TVS（瞬态电压抑制）二极管，采用 SMA 封装，专为瞬态浪涌和脉冲干扰保护设计。器件以玻璃钝化芯片和环氧树脂封装为基础，兼顾高浪涌吸收能力与长期可靠性，适用于电信、计算机及周边设备的输入/电源线防护场合。
二、主要参数
- 极性：单向（Unidirectional）
- 反向截止电压 Vrwm：85 V
- 击穿电压 VBR：104 V
- 钳位电压（典型）：137 V
- 峰值脉冲电流 Ipp：2.9 A
- 峰值脉冲功率 Ppp：400 W（10/1000 μs 波形）
- 反向漏电流 Ir：1 μA（典型）
- 类型：TVS
- 封装：SMA
以上参数为器件在标准测试条件下的典型或额定值，具体性能以厂方正式数据手册为准。
三、产品特性
- 出色的钳位能力：在指定峰值脉冲电流下，钳位电压可控制在约137 V，能有效限制瞬态过电压对后端电路的冲击。
- 低泄漏电流：反向漏电仅约1 μA，有利于在高阻抗或敏感电路中减少静态功耗和误动作。
- 低电容：适用于需要保持信号完整性的高速接口或数据线防护。
- 高浪涌能力：能承受 10/1000 μs 波形下 400 W 的瞬态功率，适合雷击浪涌和开关瞬变等场景。
- 工艺可靠：玻璃钝化芯片提高了结面稳定性，环氧封装兼顾机械强度与环境适应性。
四、典型应用
- 电信设备：线路保护、基站输入端、调制解调器等对抗雷击与线路脉冲。
- 计算机与外设：电源输入、USB/串口等端口的过压保护。
- 工业控制与仪器：电源总线和控制信号线的瞬态抑制。
- 其他需要高能脉冲吸收及低泄漏的场景。
五、封装与安装注意事项
SMA 封装体积小、焊接便利，适合通用 SMT/TH 环境。实际布局时建议：
- 将 TVS 尽量靠近被保护端口或连接器放置，缩短引线和走线长度以降低寄生电感。
- 为满足峰值能量吸收，PCB 需具备良好铜厚及散热路径，必要时考虑加大焊盘面积或接地铜箔。
- 保持合适的焊接温度曲线，遵循供应商的回流焊规范以保障封装与芯片可靠性。
六、选型与应用建议
- 若被保护线为直流或单向电压场景，单向 TVS 为优先选择。
- 关注 Vrwm 与系统最大工作电压的匹配，Vrwm=85 V 适用于相应电压等级的保护；选择时应留有安全裕度以避免在正常工作时触发。
- 钳位电压与后端器件耐压需匹配，钳位值 137 V 为最大瞬态电压参考，应确保后端元件能承受该瞬态水平或在电路中增加串联限制元件。
- 对于对信号完整性极为敏感的应用，建议评估器件的有效电容与开关特性。
SMAJ85A 以其高能量吸收能力、低泄漏和可靠的封装工艺，在电信与计算机领域可作为稳健的浪涌保护方案。选型和布局合理时，能显著提升系统对瞬态事件的抵御能力与长期可靠性。
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