VC2220K501R095 Circuit Protection

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TVS - Varistors, MOVs

VC2220K501R095 is a notable thermally triggered metal-oxide varistor (MOV)-based transient voltage suppressor (TVS) series with many useful application fields. It is designed to protect equipment from damage caused by voltage transients induced by lightning and other electrical interruption sources, typically from transient voltage events from a few microseconds up to a few milliseconds duration. This series consists of 12 devices with maximum varistor voltage ratings from 8V to 48V.

Application Field

The VC2220K501R095 series is ideal for a wide variety of applications that include products in the communication, computer, consumer electronics, instrumentation, automotive and industrial markets. It is suitable for applications such as touchscreen controllers, portable emission analyzers, differential pressure transducers, routers, power supplies, hub & switch, telecom equipment, and spare car circuits. It also provides highly reliable protection to input/output ports on devices such as microcontrollers, embedded computers, and gate array connectors.

Working Principle

The VC2220K501R095 series is composed of a zinc oxide varistor which is bonded to two aluminum oxide blocks. This varistor operates under a junction-gate control principle, and consists of a metal oxide layer which has a number of patches on it. When the voltage surges, the electric field intensity increases in the oxide layer, and at certain rates of change, electron-hole pairs form, which increase the conductivity of the gate layer, thus allowing current to flow through the diode.

The MOVs are usually coupled with a Zener diode, and together they form a clamping network. The Zener diode is designed to absorb significant voltage overshoots due to the clamping characteristics of the MOVs. The substantial difference in clamping response between the MOVs and Zener diode is that, the Zener diode offers a much slower clamping response than the MOVs, so it will absorb overshoot voltages that might otherwise cause damage to the circuit.

The VC2220K501R095 series offers a maximum peak power rating of 2000W per device and ues a 2-lead SOT143A surface mount package. The thermal resistance of the package is 2.90°C/W, and the average current is 500A. The series has a variety of advantages, such as fast response time, high surge current capability, low on resistance, wide varistor voltage range, high leakage current, and long life.

In conclusion, the VC2220K501R095 series is an excellent choice for a wide range of applications, thanks to its convenient size, wide varistor voltage range, fast response time, high surge current capability, low on resistance, and high leakage current. It also offers a long life and reliability due to its advanced design.

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