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BORN 1SMA4745A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BORN 1SMA4745A
- Type
- BORN
- Minimum package
- 5000 未知
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BORN
- Electronic Component
- 1SMA4745A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 0.102g
- Electronic Component
- 1
- (Zzk)
- 700Ω
- (Zzt)
- 16Ω
- Electronic Component
- BM0231019393
- Diode
- 1
- Current(Ir)
- 5uA
- 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.
1SMA4745A 产品概述
一、产品简介
1SMA4745A 是 BORN（伯恩半导体）旗下、采用 SMA（DO-214AC）封装的瞬态抑制二极管（TVS）类器件。标称稳压值为 16V，设计用于保护电子线路免受瞬态过压和冲击电压的损害，适用于工业、通信及汽车等需要过压保护的场合。
二、主要电气参数
- 稳压值（标称）：16V
- 工作结温范围：-55℃ ~ +150℃
- 反向电流（Ir）：5 μA（典型/最大泄漏电流，表示在额定反向电压下的泄漏）
- 耗散功率（Pd）：1W（器件在规定条件下的最大稳态功耗）
- 阻抗（Zzk）：700 Ω（静态或小信号条件下的阻抗指标，具体测试条件见厂方数据）
- 阻抗（Zzt）：16 Ω（瞬态条件下的差分阻抗，通常在一定浪涌电流下测得）
注：以上参数为器件关键标称值，实际性能会随测试条件（电流、脉冲宽度、环境温度）变化。
三、封装与机械特性
- 封装形式：SMA (DO-214AC)
- 封装优点：体积小、可焊性好、适合自动贴装与回流焊工艺，利于批量生产与 PCB 布局自动化。
- 机械可靠性：适合常见 SMT 的机械应力与振动要求，但在高冲击或强振环境下可考虑加固固定或选用更大封装。
四、典型应用场景
- 直流电源线和信号线的过压保护，尤其是 12V/24V 级别系统中对浪涌的吸收与钳位。
- 通信接口（如串口、电源输入）与接口板卡的防雷/浪涌保护。
- 工业控制、楼宇设备与消费电子在电源突变或开关瞬态下的保护元件。
五、热与可靠性指标
- 工作结温范围宽（-55℃~+150℃），适应高低温工作环境。
- Pd=1W 表明器件为中低功耗钳位，适合吸收较短时和中小能量浪涌；对于高能量或长时间冲击，应配合串联阻抗或更大功率的阻尼器件使用。
六、使用建议与注意事项
- 在设计中注意与系统的匹配：稳压值 16V 适用于 12V/24V 相关线路的钳位，但不要将其视为恒定稳压源。
- 注意器件的瞬态阻抗（Zzt）对峰值电压的影响，若系统会承受大电流脉冲，应选用更低瞬态阻抗或并联/级联方案。
- PCB 布局应尽量缩短保护器件与被保护点之间的走线，减小引线感抗以提高抑制效果。
- 注意焊接温度与回流曲线，避免超过器件允许的热应力导致性能退化。
- 贮存与搬运按半导体常规静电防护（ESD）要求执行。
七、结论与采购建议
1SMA4745A 提供了面向 16V 级保护需求的紧凑、可靠的解决方案，具有低漏电、宽温度范围和标准 SMA 封装的优点。适合用于中低能量浪涌抑制场合。采购时建议确认厂方完整数据手册中的测试条件（浪涌电流、脉冲宽度、钳位电压等）以确保与实际应用工况匹配；对高能量冲击或汽车级应用，可考虑查验是否满足更严苛的行业认证或选择更高功率等级的型号。
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