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BORN 1SMA4740A
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BORN 1SMA4740A
- Type
- BORN
- Minimum package
- 5000 未知
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BORN
- Electronic Component
- 1SMA4740A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 0.11g
- Electronic Component
- 1
- (Zzk)
- 700Ω
- (Zzt)
- 7Ω
- Electronic Component
- BM0231019395
- Diode
- 1
- Current(Ir)
- [email protected]
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 55℃~+150℃
- 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.
1SMA4740A 产品概述
一、概述
1SMA4740A 是由 BORN（伯恩半导体）提供的稳压/钳位器件，封装为 SMA（DO-214AC）。该器件以 10V 的标称稳压值为基准，适用于对电路进行稳压、过压钳位与瞬态抑制等保护功能，尤其适合工业与通信类电子设备中对稳压精度和抗干扰要求较高的场景。
二、主要电气参数
- 标称稳压值（Vz）：10 V
- 工作结温范围（Tj）：-55 ℃ ～ +150 ℃
- 反向电流（Ir）：10 μA @ 7.6 V（代表器件在接近稳压点时的漏电特性）
- 耗散功率（Pd）：1 W（在规定散热条件下的最大耗散能力）
- 阻抗：Zzk = 700 Ω；Zzt = 7 Ω（分别反映在低电流与钳位/浪涌条件下的阻抗性能）
三、特性与优势
- 宽工作温度范围（-55 ℃ 到 +150 ℃），可在高低温环境下可靠工作；
- 低反向漏流（10 μA @ 7.6 V），便于在对静态功耗敏感的电路中使用；
- 在浪涌或钳位状态下阻抗（Zzt）显著低于静态阻抗（Zzk），意味着器件在吸收突发能量时能更有效钳位电压峰值；
- SMA 封装体积小，便于表面贴装工艺（SMT），适合中小功率线路板布局。
四、典型应用
- 电源轨稳压与基准钳位；
- 输入/输出接口的过压与瞬态抑制保护；
- 通信设备、仪器仪表、工业控制模块中的局部过压保护；
- 需要在有限空间内实现中等功率防护的电子模块。
五、封装与热管理
- 封装：SMA（DO-214AC），适用于常规 SMT 工艺；
- 熔接与散热：Pd 标称为 1 W，实际应用中应参考 PCB 布局、铜箔面积及环境温度进行热沉设计并按厂方曲线做功率降额；高温下长期工作需做好散热与热循环应力管理。
六、选型与使用注意事项
- 确认工作电压与稳压值匹配，若工作点接近或超过 7.6 V，应关注 Ir 泄漏对系统的影响；
- 对瞬态能量吸收能力有更高要求时，需确认器件在规定脉冲条件下的峰值电流与能量等级；
- PCB 布局建议将器件与被保护元件尽量靠近，增大散热铜箔，避免在超出 Pd 的条件下持续吸收能量；
- 参考原厂完整数据表（包括温度特性、能量脉冲曲线与封装尺寸）以获得精确设计参数。
总结：1SMA4740A 为一种适用于中等功率稳压与保护场合的器件，结合其 10V 标称稳压、宽温度范围与 SMA 封装，适合工业与通信等多种应用，但在实际设计中应充分考虑热管理与脉冲能量能力，按完整数据表进行选型与验证。
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