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Old 24th January 2006, 12:34 PM   #1
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Default Input Transistors...

Could a TO225/Case 77 type transistor such as the BD135-139 types be used as input trannies in a general 50-80V design, or must the wattage remain in the 1W range of TO92 packages?
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Old 24th January 2006, 01:18 PM   #2
Stocker is offline Stocker  United States
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Input transistors are usually chosen for their electrical performance, not the packaging. If a transistor performs suitably for your design, use it.

You will quite possibly catch some flak for using those particular devices though.
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Old 24th January 2006, 02:02 PM   #3
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No reason why you couldn't and the amp will work. In almost all cases though the lower noise - higher gain transistors are only available in the smaller packages.

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