TLZ20-GS18

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TLZ20-GS18 Application Field and Working Principle

Diodes are passive components on an electronic circuit board that allow electrical current to flow in one direction. Zener diodes, specifically, are a type of diode specifically designed to operate in the breakdown region, allowing current to flow in the opposite direction as usual in order to limit the voltage across it. The TLZ20-GS18 is a single Zener diode with a breakdown voltage of 18 volts.

Features

The TLZ20-GS18 is designed to ensure performance, quality and reliability in a wide array of applications. Its features include a Zener voltage tolerance of ±5%, low power dissipation, an operating temperature range of −65 °C to 150 °C, and a maximum leakage current of 250 μA. The Max Repetitive Reverse Voltage (MPRV) is 30V. The Zener is capable of handling up to 0.125 Watts of power. Its Surge Power Dissipation (t=1s) is 1W and its Threshold Voltage (V) is 18V.

Application Field

The TLZ20-GS18 is primarily used in applications that require voltage limitation or voltage regulation. One example is in automotive applications such as audio systems, where it is used to regulate the car’s voltage. Other areas where it is used include the medical and telecommunications industries, where the Zener is used to regulate the voltage in oscillators and other delicate circuits, as well as in the protection of power supplies from transients.

Working Principle

The TLZ20-GS18 operates by allowing a small “reverse” current to flow through the diode’s PN junction under certain conditions. As the voltage across this PN junction increases, the reverse current also increases. When the voltage reaches the “breakdown” voltage (in this case 18 V), this current explodes and starts to flow in the opposite direction. This is known as “Zener breakdown” and it is the main way the diode is able to limit the voltage across it.

Once the voltage is greater than the breakdown voltage, its value gets clamped to this voltage, regardless of any further increases in the incoming voltage. This means that even if the input voltage is higher than the breakdown voltage, the output voltage will be the same, providing regulation and protection to the circuit.

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