View Full Version : To92 transistor pf rating


timmy
11-16-2024, 11:33 AM
Does anyone know of a to92 npn transistor that has a rating of 5-35pf ?

old_tv_nut
11-16-2024, 11:39 AM
Transistors are not made as variable capacitors and would not be primarily rated in pF.
Take another look at what you are trying to replace, post more info, schematic and/or photo, and maybe we can figure out what this is.

timmy
11-16-2024, 12:02 PM
Transistors are not made as variable capacitors and would not be primarily rated in pF.
Take another look at what you are trying to replace, post more info, schematic and/or photo, and maybe we can figure out what this is.

I’m trying to find a transistor with a higher pf rating to substitute for a varicap. I have read this can be done with using only 2 legs of the transistor.

old_tv_nut
11-16-2024, 03:08 PM
https://www.rf-microwave.com/en/itt-semiconductors/bb329a/varicap-diode-32v-2-5-35pf-do-35/bb329a/?srsltid=AfmBOopCXi4sfElK6c3PX3g382WowamuRE7_l2jUb a2ghHkXQErA7xD_

This was just a quick search - you may be able to find another source if you look.

Electronic M
11-16-2024, 05:48 PM
You might want to look for varactor diodes.

A lot of semiconductor devices display that behavior when diode connected but only varactors are purpose built for that and rated so you know what the capacitors behavior will be.