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Littelfuse SZ1SMA40CAT3G
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Littelfuse SZ1SMA40CAT3G
- Type
- LITTELFUSE
- Minimum package
- 5000
Technical parameters
- Electronic Component
- LITTELFUSE
- Electronic Component
- SZ1SMA40CAT3G
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.237g
- Electronic Component
- 1
- Cj- Capacitor
- 315pF
- Electronic Component
- BM0231094529
- Operating Temperature
- 65℃~+150℃
- Voltage
- 64.5V
- Current(Ir)
- 2.5uA
- Voltage(VBR)
- 44.4V
- Electronic Component
- 5000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SZ1SMA40CAT3G 产品概述
一、概述
SZ1SMA40CAT3G 是 Littelfuse（美国力特）出品的双向瞬态电压抑制器（TVS）二极管，封装为 DO-214AC (SMA)。该器件专为吸收瞬态浪涌与尖峰脉冲而设计，额定反向工作电压（Vrwm）40 V，钳位电压为 64.5 V（在标准测试条件下），适用于保护直流或双向（交流/可反向）电路中的中低电压节点与电子元件。
二、主要电气参数
- 极性：双向（Bidirectional），可对称抑制正负极性浪涌
- 反向截止电压 Vrwm：40 V
- 击穿电压 Vbr：44.4 V
- 钳位电压 Vc（典型）：64.5 V
- 峰值脉冲电流 Ipp：6.2 A（1 ms 波形）
- 峰值脉冲功率 Ppp：400 W @ 1 ms
- 反向漏电流 Ir：2.5 μA（在 Vrwm 条件下）
- 结电容 Cj：315 pF（影响高频信号完整性的关键参数）
- 工作温度范围：-65 ℃ 至 +150 ℃
三、性能特点
- 强劲的浪涌吸收能力：在 1 ms 冲击下可承受高达 400 W 的脉冲功率，适合电源波形突变、电感耦合浪涌及瞬态尖峰保护。
- 双向保护：对正向与反向脉冲均有抑制作用，适用于交流、双向供电或可能出现反向瞬变的系统。
- 低漏电流：在正常工作电压下保持微安级漏电，减少对电路静态性能影响。
- 较高结电容：315 pF 的结电容提示该型号更适合电源线或低速信号线路；在高速差分信号或高频接口上可能会引入显著负载与带宽限制，应评估影响。
四、典型应用场景
- 工业电源及分配线路保护（DC/AC）
- 电源输入端、逆变器与驱动模块的浪涌保护
- 通信与控制接口（需注意结电容对高速信号的影响）
- 汽车电子（在满足温度与汽车认证需求的前提下）与工业自动化设备浪涌抑制
五、封装与可靠性
SZ1SMA40CAT3G 采用 DO-214AC (SMA) 表面贴装封装，结构紧凑，适合自动化贴装与回流焊工艺。器件设计适应宽温度范围（-65 ℃ 至 +150 ℃），适合恶劣环境下长期使用。尽管具备高瞬态功率处理能力，但仍需在布板与散热设计上给予足够考虑，以避免重复高能脉冲导致热失效。
六、选型与使用建议
- 若用于高速数据线或射频接口，须评估 315 pF 结电容带来的带宽与阻抗影响，必要时选择低电容型 TVS。
- 布局建议：将 TVS 靠近被保护端口放置，尽量缩短焊盘到敏感器件的走线，减小串联电感与环路面积。
- 热与能量管理：对于经常出现大能量浪涌的场景，考虑并联冗余或使用更高额定能量的防护方案以延长可靠性。
- 测试验证：在目标系统中进行实际浪涌测试（例如 1 ms 波形）以验证钳位电压和剩余能量是否在被保护器件的安全范围内。
如需进一步的电气特性曲线、波形测试数据或推荐的 PCB 封装尺寸，请提供具体需求，我可以为您补充详细资料与应用参考。
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