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Explanation: "TRANSZORB® - TRANSIENT VOLTAGE SUPPRESSORS
General Semiconductor delivers "state of the art" Transient Voltage Suppressors (TVS). Based on controlled avalanche technology, these voltage clamping devices utilize a specific soft solder construction. This physical design enables these avalanche diodes to absorb large amounts of energy for short time durations without sustaining damage."
The 'normal' versions are called "transorb" diodes (over 590 hits).