V3.5MLA0603T Circuit Protection

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The V3.5MLA0603T belongs to a novel class of protection devices which combines positive temperature coefficient (PTC) and transient voltage suppression (TVS). Developed by SMC, the V3.5MLA0603T protection device is specifically intended for lightning and surge protection and can be advantageously utilized to separate sensitive electronics from hazardous high-voltage transients. This article addresses its application field and working principle.

Typical application fields

The V3.5MLA0603T component is primarily designed for use with semiconductor devices in order to protect against the damaging effects of electrostatic discharge (ESD) or ground-fault currents. This protection device can be utilized in a variety of applications including:

• Lightning and surge protection for automobiles
• Orange book delayer protection
• Smartphone board protection against lightening surges
• Audio systems
• Power supplies

Working principle of the V3.5MLA0603T

The V3.5MLA0603T device combines positive temperature coefficient (PTC) and transient voltage suppression (TVS) behaviour. The main component of the device is a diode array which is composed of six parallel strings of 10 diodes. Each diode is in series with a PTC. The PTC lower voltage is dependent on the junction temperature, which means that it becomes resistance as current is passed through it. The TVS component helps protect against hazardous voltage transients, and its V ld peak clamp voltage is 28V.

In normal conditions, the PTC behaves as an open circuit with current flowing through the diode strings. This limits the current flow. When the voltage applied to the device is higher than its V ld peak clamp voltage, the TVS component activates and the device begins to dissipate energy in the form of heat. This helps to limit the voltage applied to the sensitive electronics connected to the device.

In combination, the PTC and TVS components jointly provide a strong intermediary mechanism to protect sensitive electronics against hazardous voltage transients. The device is also designed to provide a low leakage current, high surge capability and long term protection from catastrophic failure.

Conclusion

The V3.5MLA0603T is a robust protection component designed to protect against lightening surges for a variety of applications. The device is a combination of transient voltage suppression (TVS) and positive temperature coefficient (PTC), resulting in a versatile protection mechanism. This article has discussed the application of the component as well as its working principle.

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