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- Pitch (emitter to emitter spacing)
- 3 (3.2 micron)
- 4 (4 micron)
- 6 (6 micron)
- 0 (10 micron - obsolete)
- finer pitch yields higher performance
- Number of Fingers
- range: 1 - 640 emitter fingers
- more emitter fingers yield higher power, but require more current
- (special note - the AT-415 series are 4 micron 14 emitter finger devices identical to the AT-414 series except for an enlarged bond pad that lowers assembly cost and slightly reduces high frequency performance. The AT-316, AT-332 and AT-364 power geometries have 160, 320 and 640 emitter fingers respectively. )
- Package:
- refer to package options
- Example:
- AT-32011
- AT: bipolar transistor
- 3: 3.2 micron emitter to emitter spacing
- 20: 20 emitter finger transistor
- 11: SOT-143 package
- Note: The HBFP Series transistors do not follow this nomenclature system
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