cross-referencing transistors

jarthel · 19th July 2007, 02:55 PM

When searching mouser catalog, it also suggest supposedly equivalent parts.

For example: I was searching for "IRF9Z34" and I got "SFP9Z34" which is a Fairchild equivalent part. This is probably right by looking at the part number. there are very similar.

Fairchild's website has an equivalent part search. When I put in "IRF9Z34", the results gave me "FQP17P06" as a "drop-in" replacement.

My question is: Who do I trust? Is there an authoritative website?

for tubes, Frank and TDSL can suggest equivalent and near-equivalent tubes. Is there something similar for semiconductors specifically transistors?

Thank you very much

Conrad Hoffman · 19th July 2007, 03:11 PM

Trust no one, the truth is *not* out there. Always get a datasheet for both parts and compare relevant specs and pinouts. Semiconductor substitution depends on the application, so any factory lists are just a guess, except for the cases where a part is a true "second source", carries a similar part number, and the specs are basically identical. Even "improved" parts can cause problems if the BW has been increased or the Hfe is way better, since a given design might no longer be stable.

19th July 2007, 02:55 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	cross-referencing transistors When searching mouser catalog, it also suggest supposedly equivalent parts. For example: I was searching for "IRF9Z34" and I got "SFP9Z34" which is a Fairchild equivalent part. This is probably right by looking at the part number. there are very similar. Fairchild's website has an equivalent part search. When I put in "IRF9Z34", the results gave me "FQP17P06" as a "drop-in" replacement. My question is: Who do I trust? Is there an authoritative website? for tubes, Frank and TDSL can suggest equivalent and near-equivalent tubes. Is there something similar for semiconductors specifically transistors? Thank you very much

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19th July 2007, 03:11 PM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	Trust no one, the truth is not out there. Always get a datasheet for both parts and compare relevant specs and pinouts. Semiconductor substitution depends on the application, so any factory lists are just a guess, except for the cases where a part is a true "second source", carries a similar part number, and the specs are basically identical. Even "improved" parts can cause problems if the BW has been increased or the Hfe is way better, since a given design might no longer be stable.

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