SA90

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SA90 is a series of transient voltage suppressors (TVS) diodes that are designed to protect electronic circuits from over-voltage conditions, such as those caused by electrostatic discharge (ESD) or lightning strikes. They can also be used as a gate drive for power MOSFET or IGBT components, for example in motor drives.

The SA90 series consists of semiconductor devices that have an insulated gate and internal bi-directional polymer-enhanced glass passivated junctions. The device consists of three main components: a Schottky diode, a Zener diode, and a high-speed edge-triggered triode. The Schottky diode provides a low-impedance path for positive voltage transients. The Zener diode, which serves as a focal point for storing electrical energy, is connected in reverse bias and helps to reduce the transient voltage and limit its current. The triode provides DC gain for the input/output voltage and is used to trigger a gate drive for downstream MOSFET components.

When the input voltage rises above the specified breakdown voltage, the diode conducts current and the transient voltage is rapidly reduced. The Zener diode then takes over as the current is transferred from the Schottky diode to the Zener diode. The result is a lower sustained output voltage and fast transient response time.

SA90 diodes are suitable for a wide variety of applications. In automotive, they are used in automobiles, motorcycles, recreational vehicles, electric cars, and passenger and freight trains to protect against electrostatic discharge, surge induced voltage, and other over-voltage conditions. In industrial applications, they are used in AC/DC power supplies, motor drives, UPS systems, lightning protection, and security systems, among many others.

In addition to protecting against voltage surge, SA90 diodes can also be used as gate drives for power MOSFET and IGBT components. The device can provide a high-speed edge-triggered drive signal to the gate of the downstream transistor, allowing a high-frequency signal to control the switching of the transistor. This is useful in applications such as motor drives and pulse-width modulation (PWM) motor controllers.

SA90 diodes are available in a wide variety of breakdown voltages, from 5V to 24V, and up to 20A pulsed-current ratings. They are also available with multiple mounting options and in various packages, making them suitable for all kinds of applications.

In summary, SA90 is a series of transient voltage suppressors (TVS) diodes designed to protect electronic circuits from excessive voltage. It consists of a Schottky diode, a Zener diode, and a high-speed edge-triggered triode. It can be used for protection against electrostatic discharge, lightning protection, motor drives, and pulse-width modulation (PWM) controllers, and is available with a variety of breakdown voltages, current ratings, and mounting options.

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