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ST SM4T28AY
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ST(STMicroelectronics) SM4T28AY
- Type
- ST
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- ST(STMicroelectronics)
- Electronic Component
- SM4T28AY
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.13g
- Electronic Component
- 1
- Electronic Component
- BM0000257572
- Operating Temperature
- 55℃~+150℃
- Voltage
- 50V
- Current(Ir)
- 200nA
- Voltage(VBR)
- 29.5V
- 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.
SM4T28AY 产品概述
一、主要特点
SM4T28AY 是意法半导体（ST）推出的一款单向瞬态电压抑制器（TVS），用于静电放电（ESD）和浪涌保护。器件封装为 SMA（DO-214AC），耐受高能脉冲能力强，适合保护24V等级的电源轨与信号线。主要参数摘要：
- 钳位电压（VC）：50V
- 反向工作电压（Vrwm）：24V
- 击穿电压（Vbr）：29.5V
- 峰值脉冲功率（Ppp）：2.3kW @ 8/20µs
- 峰值脉冲电流（Ipp）：46A @ 8/20µs
- 反向漏电流（Ir）：200nA
- 极性：单向
- 工作温度：-55℃ ~ +150℃
二、功能与工作原理
单向TVS在正常工作时呈高阻（反向偏置），当瞬态电压超过其击穿电压（约29.5V）时瞬间导通，把过电压钳位到约50V并将能量吸收或分流到地，从而保护后端敏感器件。8/20µs 波形下可承受46A峰值电流，对抗浪涌和雷击瞬变能力良好。
三、典型应用场景
- 汽车电子供电与控制模块（24V车载系统的辅助保护）
- 工业控制设备、PLC、传感器接口
- 通信设备和POE外围电路的浪涌保护
- 任何需在24V反向工作电压下进行抑制的电源轨与接口保护
四、封装与布局建议
SMA（DO-214AC）封装便于波峰/回流焊装配。设计时建议：
- TVS 尽量靠近被保护端（输入端）布置，缩短走线以降低感性耦合。
- 提供可靠的接地回路，保证能量迅速分流。
- 对热量敏感的应用注意环境温度与铜箔散热，器件工作温度最高可达+150℃，但长期热应力仍需评估。
五、选型与使用注意
- 若系统稳态电压接近24V，应确认 Vrwm 与最大工作电压余量，避免误触发。
- 钳位电压50V为典型值，需评估被保护器件能否承受此电压峰值。
- 反向漏电流仅200nA，适用于对泄漏敏感的电路，但应在高温或高偏压条件下复核泄漏性能。
- 对更高能量需求或双向保护需求，可考虑功率等级或极性不同的TVS。
本器件以其高峰值功率吸收能力、宽温度范围与小体积封装，适合要求可靠性与抗浪涌能力的24V级电源与接口保护应用。
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