SMBJ180CA

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TVS - Diodes

The SMBJ180CA is a unidirectional TVS diode. TVS Diodes or Transient Voltage Suppressors are semiconductor protection elements which are typically dispensed in-line or connected across vulnerable points in circuits or power lines.

TVS diodes protect circuits from higher voltages, due to transmission line surges, electrostatic discharges (ESD), inductive switching or lightning strikes. Depending on the application field, these transistors are built as single discrete devices or as an array (as part of a diode array) and are suitable across common voltage levels (up to several hundred volts).

The SMBJ180CA is a single transistor device which can absorb transient voltage, and is designed for a specific operating voltage (155V). It is rated for a peak pulse power of 600 Watts and can be used across multiple industry applications. Its Reverse Stand off Voltage (VRWM) is 130V.

The working principle of a TVS diode is simple, once installed it reacts to large voltage shifts from a given value by clamping to the desired level (such as 120V). TVS diodes of this type help protect against transient voltage spikes, either caused by equipment within the system or external influences, from disrupting or damaging components within the system.

TVS diodes are designed to redirect surplus voltage or static away from sensitive components. In order to reduce the risk of damage or disruption, these diodes must be able to withstand multiple transient surges and be able to absorb the energy generated.

In the case of the SMBJ180CA, the diode can effectively absorb the energy from spikes up to a peak power of 600 Watts, due its 180 Amperes peak pulse current rating (ITSM). These figures indicate the diode’s ability to both absorb and dissipate the generated voltage.

To help dissipate the absorbed energy, the SMBJ180CA is built with a low clamped voltage figure (VCL, 72V). This indicates the unit’s ability to drop its voltage to an appropriate level while, at the same time, being able to dissipate the absorbed energy (PD 12.5 Watts).

In summary, the SMBJ180CA is a unidirectional TVS diode which can effectively minimize the risk to electronic components from faulty power lines. The device is rated for 155V nominal voltage and withstands peak pulse power up to 600 Watts, with peak pulse current of 180 Amperes and a maximum power dissipation of 12.5 Watts.

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