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CJ 1SMA4746A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ 1SMA4746A
- Type
- CJ
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- 1SMA4746A
- Electronic Component
- 1
- Package
- SMAG
- Electronic Component
- Zener Diode
- Electronic Component
- ±5%
- Electronic Component
- 0.107g
- Electronic Component
- 1
- (Zzk)
- 750Ω
- (Zzt)
- 20Ω
- Electronic Component
- BM0235673452
- Diode
- 1
- Current(Ir)
- 100nA
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 55℃~+150℃
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
1SMA4746A 产品概述
一、产品简介
1SMA4746A 为 CJ（长电/长晶）生产的一款 18V 稳压二极管，采用 SMAG 表面贴装封装，额定耗散功率 Pd=1W，工作结温范围 -55℃~+150℃。该器件在低偏压下具有极小的反向漏流（[email protected]），同时提供较低的动态阻抗，适用于需要稳定基准电压和浪涌限制的场合。
二、主要电气参数
- 标称稳压值（Vz）：18V
- 反向电流（Ir）：100nA（在 13.7V 条件下测量）
- 耗散功率（Pd）：1W（在规定散热条件下）
- 动态阻抗：Zzt = 20Ω（测试电流点下）
- 谐波或转折阻抗：Zzk = 750Ω（低电流拐点处）
- 工作结温范围：-55℃ ~ +150℃
- 封装：SMAG（SMA 类表面贴装封装）
以上参数为选型与热设计、稳压精度评估的关键指标。
三、器件特性与优点
- 低静态漏流，适合高阻抗基准和精密测量电路。
- 低测试点动态阻抗（Zzt），在中等电流下稳压性能良好。
- SMAG 小型化封装，适合自动贴片工艺与空间受限的电路板设计。
- 宽温度范围与 1W 功耗能力，适合工业级应用环境。
四、典型应用场景
- 直流稳压与基准电压源（小功率分流稳压）。
- 输入浪涌与反向电压保护（对敏感器件或接口保护）。
- 仪表放大器、电池管理与便携设备的局部稳压。
- 通信与工业控制设备中的过压钳位和参考电压。
五、设计与使用建议
- 最大稳压电流 Iz(max) ≈ Pd / Vz = 1W / 18V ≈ 55.6mA。长期工作时应留安全裕量，建议使用低于最大值的工作电流以降低结温。
- 举例计算：若电源为 24V，需在 18V 处钳位且选择工作稳压电流 Iz = 25mA，则限流电阻 R = (24-18) / 25mA = 240Ω；该电阻的功耗 P_R = I^2·R ≈ 0.375W，建议选用额定功率 ≥1W 的电阻并注意散热。
- 对于参考用途，应保证并联电路的最低偏流能维持在稳压区，否则会出现转折（Zzk 所表征）导致电压不稳。
- 封装散热受 PCB 铜箔面积影响显著，需在布局时考虑热回流与铜箔加大以提高功耗能力和可靠性。
六、封装与可靠性要求
SMAG 为常用 SMA 类表面贴装封装，支持回流焊工艺。建议按照器件厂商提供的焊接温度曲线进行回流，以避免热应力导致性能退化。储存与焊接前注意防潮处理，出厂后在规定时限内贴装。
七、选型与采购提示
选型时请以完整型号 1SMA4746A（CJ）及封装 SMAG 为准，核对供应商数据手册以获取完整的电气表征曲线与推荐的测试条件。若需替代，可选用其它厂家相同性能的 18V、1W SMA 稳压二极管，注意比较 Zzt、Zzk、Ir 与最大结温等关键参数以确保行为一致。
如需器件的原理曲线（I-V、温度系数）、推荐焊接规范或在具体电路中的参数验证示例，我可以帮您进一步计算与绘制参考数据。
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