V18ZA40

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The TVS - Varistors, MOVs, consists of one of the most popular types of transient voltage surge suppressor. The V18ZA40 is one such variant of it. It is a bidirectional double layer varistor designed for medium reliability applications where working voltage up to 750V is required. It is compact and low cost device designed for low voltage protection of electronic circuitry against overvoltages caused due to lightning, power cross, or for providing signal line protection.

The V18ZA40 is a combination of Varistor-Diode and Varistor-Bidirectional Transient Voltage Suppressor. Varistor-Diode is a two terminal protection device that combines the protective features of Varistor and Diode. Varistor is an electronic semiconductor device that can be created using different types of materials such as gallium arsenide, nitrogen, silicon, or other compounds. When exposed to an overvoltage, the Varistor offers high resistance to absorb the energy of the transient. On the other hand, the Diode acts as a reverse blocking device that blocks the energy of the transient to avoid damaging the circuit.

The Varistor-Bidirectional Transient Voltage Suppressor, on the other hand, is a four terminal device that is composed of two Varistor-Diode sections arranged in back-to-back combination. This combination provides protection for both overvoltage and undervoltage conditions. The device is designed to be used with a transient voltage suppressor, which is a diode-based device that clamp the voltage during an over voltage or under voltage transient.

Typically, the V18ZA40 application field consist of telecom equipment, digital equipment, broadcast and navigation systems, signaling and protective circuits, electronic devices and electro-mechanical switches, and automotive electronic equipment. Its working principle is it absorbs the energy of the overvoltage by way of high resistance due to its varistor properties. The device also blocks undervoltage transient with the help of its Diode-Bidirectional combination. Typically, the device offers overload protection up to 550VAC, and moreover it has a breakdown voltage of 600V and a typical leakage current of 24mA under 500V. It is designed to meet IEC60898 and IEC61643 standards.

In addition, the V18ZA40 is RoHS-compliant and provides an overvoltage protection up to 750VAC with a high durability of up to 2000V. It has an acceptable energy absorption capability of up to 1J, with a wide temperature range of -40 to +125°C, which makes it suitable for applications in diverse industries. The device is also designed with quick responses with a fast recovery time.

Moreover, it also resists to dynamic stress caused by transients. The V18ZA40 is also designed to meet various requirements of safety standards such as UL, EN, IEC, UL1459 and RoHS. It also has an operating frequency of up to 40kHz with a storage temperature of -55 to +125°C. The device is available in various sizes such as 1812, 2220 and SMD packages.

Overall, the V18ZA40 is a highly reliable and durable device used in various applications to provide protection from overvoltages and undervoltages. Its Varistor-Diode combination ensures fast response times and high resistance to absorb the energy of the transient. The device also meets various safety standards and has excellent energy absorption capacity. It also has a wide operating temperature range, making it suitable for a variety of applications.

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