SA28AHR0G Circuit Protection

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Transient Voltage Suppressor (TVS) diodes – also known as "surge protectors" – are a key element of any power supply integrated circuit (IC) that is designed to protect its associated circuit from voltage surges caused by power inductive loads and electrostatic discharge (ESD). The SA28AHR0G, a 1.5A TVS diode, is specifically designed for protection of high-speed signal lines.

A TVS diode is a bidirectional device with two back-to-back zener diodes in a single package. They are often used to protect both USB, I2C and SPI bus lines from ESD pulses and voltage transients that can potentially damage the microcontroller.

The SA28AHR0G is an ultra-low capacitance silicon-based diode, intended for use in applications requiring circuit-level ESD and transients protection when high-speed data pulses are present. It offers ESD protection up to 25kV, providing high levels of protection even in the presence of ESD pulses. It is specifically designed to protect sensitive I/O ports of microprocessors, microcontrollers, and other high-speed signal interface circuits.

The SA28AHR0G is a unidirectional device, which means that the device will only protect the component from the direction in which it is installed. The device has a reverse standoff voltage of 18V, a soldering temperature of 260°C maximum, and a leakage current of 1mA. It operates with a typical response time of less than 1ns, ensuring a high level of protection against ESD pulses and other transient events.

The SA28AHR0G utilizes an industry-standard SOT-23 package size, which enables designers to easily integrate the device into a variety of circuit designs. This small size also allows the diode to be soldered directly onto the PCB, which eliminates the need for any additional components.

The working principle of the SA28AHR0G is relatively simple. When the voltage across the diode rises above the reverse breakdown voltage of 18V, the diode begins to conduct and it starts to clamp the excess voltage to the reverse breakdown voltage. This clamping voltage limits the amount of energy that can be transferred to the circuit, thus protecting sensitive components from being damaged by excess voltage levels.

The SA28AHR0G is an ideal device for designers looking to protect their components from voltage surges. Its low capacitance and fast response time make it an ideal choice for high-speed signal applications. Its simple construction and ability to be soldered directly onto the PCB make it perfect for any circuit design.

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