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BORN 1SMA4743A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BORN 1SMA4743A
- Type
- BORN
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BORN
- Electronic Component
- 1SMA4743A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 1.012g
- Electronic Component
- 1
- (Zzk)
- 700Ω
- (Zzt)
- 10Ω
- Electronic Component
- BM0264900538
- 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.
1SMA4743A 产品概述
一、产品简介
1SMA4743A 为 BORN（伯恩半导体）出品的 1W 等级稳压管（表贴型），封装为 SMA（DO-214AC）。该器件标称稳压值 13V，适用于对电压精度要求中等、功耗不高的稳压与浪涌抑制场合。器件在工作结温范围内可稳定工作：-55℃ ~ +150℃。
二、主要电气参数与含义
- 标称稳压值：13V（在规定测试电流下的稳压参考点）。
- 反向电流 Ir：5 μA @ 9.9V，表明在接近击穿电压以下的反向漏电较小，有利于低功耗应用。
- 耗散功率 Pd：1W（在规定散热条件下器件可持续耗散功率）。
- 阻抗 Zzt：10 Ω（在测量电流下的动态阻抗，数值越小，稳压性能越好）。
- 阻抗 Zzk：700 Ω（膝部阻抗，反映低电流区的特性，影响启动与小电流下的稳压行为）。
这些参数共同决定稳压精度、负载响应与在实际电路中的表现。
三、典型应用场景
- 小功率电压基准与稳压（为小电流负载或参考电路提供稳定 13V）。
- 浪涌/过压旁路与钳位，保护敏感器件免受短时电压尖峰影响。
- 波形裁剪、电平移位与测试板上调试使用。
四、使用与选型要点
- 选型时需考虑最大输入电压与最大负载电流，确保在最坏工况下器件耗散功率 Pd 不被超过。
- 串联电阻计算：R = (Vin_max - Vz) / (Iz + Iload)，其中 Iz 为稳压管的工作电流（需保证在 Zzt 指定的测试点附近以获得良好稳压）。
- 热管理：SMA 封装热阻受 PCB 铜箔面积影响较大，建议通过增加焊盘铜面积或散热层来降低结温；必要时按温度修正功耗（随温度上升需降额使用）。
- 对于低电流或要求快速响应的场合，应注意 Zzk 对低电流区的影响，可能需要选用低 Zzk 或更低动态阻抗的型号。
五、封装与焊接注意
- 封装：SMA（DO-214AC），适用于常规贴片回流焊工艺。
- 焊接：遵循器件制造商的回流曲线（无铅回流峰值温度通常不超过 260℃），并避免长时间高温暴露以保护器件性能。推荐在 PCB 设计时为焊盘提供足够的热扩散铜箔。
六、可靠性与保管
- 工作结温范围宽（-55℃～+150℃），适合工业级应用。
- 储存与装配时注意防潮和静电防护（ESD），避免超出额定功耗和反复过压冲击以延长寿命。
总结：1SMA4743A 是一款适用于中低功耗稳压与钳位保护的 13V SMA 封装稳压管，凭借较低的动态阻抗与小漏电特性，适合在空间受限的 SMD 设计中作为简单稳定的电压参考或保护元件使用。选型与设计时需重点关注热管理与工作电流范围以确保长期可靠运行。
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