SM15T100CA-E3/9AT

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TVS (Transient Voltage Suppressor) diodes are devices designed mainly to protect sensitive electronics from excessive transient voltages such as those that arise from electrostatic discharge (ESD) events. The SM15T100CA-E3/9AT is an example of such a device, specifically designed to endure harsh automotive operating environments. This article will provide an overview of the application fields and working principles of the SM15T100CA-E3/9AT.

Application Field

The SM15T100CA-E3/9AT is a unidirectional TVS diode rated for an operating voltage of 15V with power dissipation of 900mW. It is designed to protect sensitive electronics from ESD, as well as from other damaging transients like electrical fast transient (EFT) and surge events. The design of the diode is optimised for automotive applications and it features an automotive-qualified reflow profile. It is capable of handling large currents of up to 100A, making it well-suited for automotive protection applications, such as protection of automotive electronic control units (ECUs).

Working Principle

The SM15T100CA-E3/9AT employs a valve-action diode design that enables it to dissipate the energy of transients up to 100A. When a transient occurs, the diode limits the voltage across the protected load, preventing it from exceeding the diode’s specified peak power dissipation rating. The diode is designed so that it only starts conducting when the voltage across it exceeds its breakdown voltage (V_BR). During an ESD event, the diode begins to conduct current and clamps the voltage across the protected load. This helps to reduce the peak voltage seen by the load and limits the energy that is transferred. After the transient event has subsided, the diode returns to its blocking or non-conducting state.

The SM15T100CA-E3/9AT is also designed so as to recover quickly from the effects of transients. In contrast to other TVS diodes, this diode exhibits a very low clamping voltage (V_CLAMP), indicating its ability to recover quickly while simultaneously preventing the transfer of higher than acceptable levels of energy to the protected load. This makes it ideal for the protection of sensitive components in automotive environments.

Conclusion

The SM15T100CA-E3/9AT is an important component for protecting complex electronics in automotive environments. Its design makes it resistant to high voltages and currents, and also makes it capable of quickly recovering from transients. Understanding the application field and working principles of this diode is key to making sure that automotive electronics remain safe and reliable under even the harshest of operating conditions.

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