SA85AHA0G Circuit Protection

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Introduction to SA85AHA0G TVS - Diodes

Transient Voltage Suppressors (“TVS” is the acronym) are designed to protect sensitive electronics components from voltage exposures or transients created by outside sources. These sources can range from radio interference, lightning, or abnormally high levels of current. The SA85AHA0G TVS - Diode is an ideal solution for controlling these surges in the automotive industry. In this article, we will explore the various application fields and the working principle of SA85AHA0G TVS diodes.

Applications

The SA85AHA0G uses a Schottky and a Zener Diode to protect automotive power semiconductors and circuits against transients and overvoltages. It is often used to protect alternators, electric power steering/ steering motors, as well as control modules, from too much current passing through them. It is also used in the connection between the alternator and the battery; this connection has to be tightly regulated to prevent overcharging. It is also found in the radio, where its high capacitance and low capacitance limits can protect the radio from transients and other signals.

In addition, the SA85AHA0G is also used to protect vehicle and motor control systems. Automotive power electronics include electric motor drivers, electric motor control ICs, and other power microcontrollers. These microcontrollers are highly vulnerable to overvoltage and voltage surges. The SA85AHA0G can be placed in these systems to protect them from potential voltage fluctuations.

Working principle

The working principle of SA85AHA0G TVS diode is based on a Schottky and a Zener diode combination. The Schottky diode is connected in parallel with the Zener diode. When the current passes through the device, the Schottky diode will absorb the positive voltage, while the Zener diode will absorb the negative voltage.

This arrangement allows for a much higher voltage tolerance of up to 24V. Furthermore, the combination of the two diodes also enables a much larger capacitance up to 100pF. This larger capacitance allows for better protection from transient voltage surges. In addition, the Schottky diode also acts as a conductor allowing for an easy implantation in existing circuits.

Conclusion

In conclusion, the SA85AHA0G is an ideal solution for protecting automotive circuits and components from transient voltage surges. Its combination of a Schottky and a Zener diode enables it to conduct up to 24V and provides capacitance up to 100pF. This high capacitance allows for better protection against transient voltage surges. Furthermore, the device is easy to install in existing circuits. This makes the SA85AHA0G the perfect solution for automotive power semiconductor protection.

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