Fast TVS Diodes For Aircraft Electrical Systems


Microsemi announced a new series of smaller, lighter and high-performance transient voltage suppression (TVS) diodes to provide protection against transient overvoltage occurrences. The devices provide high reliability in avionics applications such as engine control units and actuator controls, power distribution, environmental control, communications and instrumentation systems. Additional applications include circuit protection for ruggedized handheld radios, GPS, communications test equipment, industrial logging equipment, power supplies, and marine and aircraft electrical systems.

The new Powermite1 MUPT series are highly compact, 1,000-watt (W), surface mount, single channel devices featuring superior thermal and power handling capabilities. The new series is ideal for aircraft electrification systems which require small, light and reliable TVS solutions for greater reliability and higher fuel efficiency.

“With increased aircraft electrification continuing to increase, our new devices are ideal to capitalise on this market growth. From a global demand perspective, we estimate the overall market for protection devices is likely to reach US$ 1 billion by 2018. As a leader in high-reliability solutions, Microsemi continues to execute on a full range of innovative product developments to support the stringent and evolving needs of this industry”, said Christophe Warin, senior director of strategic marketing for Microsemi’s Power Discrete and Modules Group.


The TVS diodes provide aircraft and other electrical systems with critical protection by going into avalanche breakdown within a few nanoseconds to clamp the transient voltage. The devices can withstand a 10/1,000 microsecond pulse with peak pulse power rating is 150W. The 1000W rating is for an 8/20us microsecond pulse.

Oxide-passivated chips with high-temperature solder bonds for provides high surge capability and negligible electrical degradation under repeated surge conditions. Both unidirectional and bidirectional configurations are available.

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The compact device offers one-third reduction in size (less than 1mm high and 2mm square) compared with two-leaded devices in conventional surface mount assembly (SMA) packages. Compared with similarly-sized SOT-23 devices, Powermite delivers superior thermal and power handling capability.

The devices are offered in voltages ranging from 5V to 48V and feature an innovative design making them fully compatible for use with automatic insertion equipment. A fully metallic bottom (anode) side of the Powermite eliminates the possibility of solder flux entrapment at assembly. A unique locking tab design serves as an integral heat sink.

The TVS diodes are 100 per cent surge tested available in various ‘screened’ versions (M, MA, MXL and MX) that have passed additional screening tests to improve reliability. The devices also comply with Moisture classification Level 1 with no dry pack required.

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