SMCJ45CE3/TR13

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Transient voltage suppression (TVS) diodes are widely used in electronic equipment to provide protection from electrical transients, which can otherwise cause serious damage to the device. The SMCJ45CE3/TR13 is a unidirectional TVS diode which offers protection from damaging transient voltage events. Here, we discuss the application fields and working principle of the SMCJ45CE3/TR13.

Application Fields

The SMCJ45CE3/TR13 is a unidirectional TVS diode and is a member of STMicroelectronics\' Automotive-AEC-Q101 qualified series of transient voltage suppressors. It is designed specifically to protect sensitive electronic equipment from high voltage transient surges. It is commonly used to protect power and signal lines from voltage transients in automotive applications, although it can also be used in industrial and consumer applications.

The SMCJ45CE3/TR13 is available in the small and reliable SMA and SMB packages, and provides bi-directional protection. It can absorb up to 16A peak pulse current, and is suitable for automotive loads from 18V to 72V. The TVS diode also has a low leakage current in the reverse direction, up to 1μA continuous current for the SMA package and 10μA for the SMB package.

Working Principle

A TVS diode works by providing a short-circuiting path across a power line when it detects a voltage spike in the line. This reduces the voltage on the line by shunting the excess energy away from the protected device. In the case of a unidirectional diode such as the SMCJ45CE3/TR13, the diode is designed to only respond to voltages in one direction, for example from the positive to the negative side of the line.

When the voltage reaches the threshold of the SMCJ45CE3/TR13 (18-26V for the SMA package, and 32-58V for the SMB package), it conducts the current away from the protected device. This reduces the voltage across the device and prevents it from being damaged. The SMCJ45CE3/TR13 is capable of absorbing up to 16A of peak pulse current, and can therefore protect the equipment from a wide range of voltage spikes.

Once the voltage spike has passed, the diode will reset itself and return to its normal low-resistance state, allowing current to flow freely to the device. The low leakage current in the reverse direction ensures that the diode does not act as a source of noise when the voltage is in the normal range.

Conclusion

The SMCJ45CE3/TR13 is a unidirectional TVS diode which offers protection from damaging voltage transients. It is commonly used to protect power and signal lines in automotive applications, but can also be used in industrial and consumer applications. The diode is capable of absorbing up to 16A of peak pulse current, and can therefore protect the equipment from a wide range of voltage spikes. Once the voltage spike has passed, the diode will reset itself and return to its normal low-resistance state, allowing current to flow freely to the protected device.

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