SA48CAHB0G Circuit Protection

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TVS – Diodes are a type of protection device offering clamping protection from electrostatic discharge (ESD), electrical over-stress (EOS), as well as transient surges caused by lightning. As a specialized diode, a TVS Diode offers a well-controlled reverse avalanche voltage that easily stops both positive and negative electrical transients.

The SA48CAHB0G is a transient voltage suppression diode specifically designed for automotive applications and offers a normal operating range from -40°C to +125°C. This diode is available as a SMD 2-pin package, with a breakdown voltage spanning from 4 to 100V. It provides up to 1.5A of peak pulse current, and has an excellent clamping capability with reverse standoff voltage of 4V. The low thermal resistance of this diode limits the power dissipation.

The application field of the SA48CAHB0G device is in the automotive industry, location in 12V, 24V and 48V on-board distribution systems. It is capable of protecting sensitive equipment generally connected to the battery on-board, from ESD strikes, ESD-induced latch-up or Battery over-voltage. This device is also suitable for protecting loads from voltage transients generated by lightning or switching inductive loads.

The working principle of the SA48CAHB0G reverse diode is to supply fast acting conductive connection to ground every time a voltage transient (also known as surge voltage) exceeds the clamping voltage of the diode. When the transient is greater than the diode’s breakdown voltage, the diode take over the current path to ground and will remain in the on-state until the voltage returns to normal operating conditions. The low forward voltage of the diode ensure very little power loss and at the same time it ensures stability of the current injection in to the ground.

In conclusion, SA48CAHB0G is specifically designed as a transient voltage suppression diode to defend against ESD, ESD-induced latch-up, and Battery over-voltage in the automotive industry. Its reverse breakdown voltage is designed to limit the surge current running through the circuit. By using this device, it can protect sensitive equipment for 12V, 24V and 48V on-board distribution systems against transients.

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