An Introduction to Performance, Characteristics and Applications
The Zetex Semiconductors ZTX415 is an avalanche transistor that ideally suits this mode of operation and application. The device is available in the proven silicone E-Line package that assures
excellent thermal properties to complement the high performance avalanche characteristics. It is also available in the SOT-23 surface mount package (as FMMT415) to enable very low inductance designs.

Avalanche transistors are characterised by a negative resistance region in their V-I breakdown curve (usually called secondary breakdown). This region permits controlled switching of very high currents in nanoseconds when appropriate external circuitry is employed. The output pulse generated is limited by the primary breakdown BVCBO, the transistor’s ‘Onstate’ voltage and the mean dissipation that can be tolerated.

Avalanche mode characteristics can be realised in a wide variety of circuits from simple single capacitor arrangements through shaped pulse circuits, fast monostables and high current/high voltage pulse generators. The following gives some typical application examples.

Read and donwnload: http://www.zetex.com/3.0/appnotes/apps/an8.pdf

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