MASMBJSAC45E3 Circuit Protection

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A TVS (Transient Voltage Suppressor) diode, such as the MASMBJSAC45E3, is specifically designed to protect sensitive electronics from transient voltage spikes that could be very damaging, such as those caused by lightning. The “over-voltage” protective devices, which form the basis of a surge protection system, are essentially electronic components that clamp down transient voltages before they cause any damage.

In the specific case of the MASMBJSAC45E3, it is a bi-directional TVS diode designed for use with automotive electronics and applications. It is manufactured in an SOD-123 package, and has an operational voltage rating of 34V and a maximum power dissipation of 1W at 25°C. This makes it suitable for 12V automotive applications such as lighting, engine control, and powertrains, for which it also offers very low leakage current at up to 8mA. Since the MASMBJSAC45E3 has a very low capacitance of 0.05pF, it is well suited for high frequency transient applications.

In addition, the device offers excellent EMI attenuation. The avalanche breakdown voltage is 40V with a clamping voltage of 57V, providing excellent protection against surges and spikes. It also has an extremely fast response time of less than 5ns, for immediate protection against transients.

The main working principle of the MASMBJSAC45E3 is very simple – it is designed with the ability to instantly “clamp” any transient voltages at its threshold level, thus preventing overvoltage and eliminating the risk of damage. The diode works by detecting potential “over-voltage” spikes, and then suppressing them by converting the excess energy into heat. This prevents any electrical current from passing through the sensitive components, robbing them of their delicate voltage and drastically damaging them.

The MASMBJSAC45E3 is a great choice for over-voltage protection in automotive applications. It responds extremely quickly to spikes, and provides excellent EMI and ESD protection. It also offers very low leakage current at up to 8mA, making it particularly suitable for high-frequency transient applications. The device is affordable, reliable and easy to install, making it an ideal solution for automotive surge protection.

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