1、有一种TVS二极管阵列,叫PSM712PSM712瞬态抑制TVS二极管阵列是专为保护具有非对称工作电压(-7V至12V)的RS-485应用而设计的,使其端口免受ESD、EFT和雷电导致的浪涌电流带来的危害。TVS二极管阵列PSM712,能够吸收高于IEC 61000-4-2国际标准规定之最高级别的反复性ESD放电,同时在极低的箝位电压下安全地耗散19A的8/20us波形浪涌电流,根本不用担心其功能会发生退化。PSM712瞬态抑制二极管阵列参数详解:封装:SOT-23功率:400W电压:12V电容值:55pF-75pF浪涌电流:12A
2、PSM712瞬变抑制二极管阵列特色优势•高可靠浪涌和增强型ESD保护功能;•非对称断态电压,符合RS-485收发器规格;•低动态电阻(0.5Ω TYP)提供出色的箝位性能;•出色的功率处理能力,相比行业其他解决方案高出50%,带来更多的自由度;•低箝位电压,不干扰线路的正常工作;•低动态电阻(0.5Ω TYP)提供出色的箝位性能;•75pF最大的低电容负载有利于保持信号的完整性,同时,在长距离RS-485布线中,能够•最大限度减少数据的丢失;•符合AEC-Q101汽车级标准;
3、PSM712瞬态抑制二极管阵列在RS-485中的应用EIA RS-485 specifies a ±7V 爿讥旌护ground difference between devices on the bus. This permits the bus voltageto range from +12V (5V + 7V) to -7V (0 - 7V).The PSM712 is designed to protect two RS-485 data lines in extended common mode applications. The PSM712 may be used to protect devices from transient voltages resulting from ESD, EFT, and lightning.The device is designed with asymmetrical operating voltages for optimum protection. The TVS diodes atpins 1 and 2 have a working voltage of 12 volts. These pins are connected to the differential data linepairs. The TVS diodes at pin 3 have a working voltage of 7 volts. Pin 3 is connected to ground. Theinternal TVS diodes of the PSM712 will protect the transceiver input from positive transient voltagespikes greater than 12V and Negative spikes greater than 7V.除了RS-485端口的防护应用,PSM712瞬变抑制二极管阵列还应用在汽车电子、现场总线、安全系统、自动柜员机(ATM)、自动化设备、企业交换机、通讯设备、HFC系统、DMX512、Modbus、Profibus现场总线等产品领域中。