SMD Transistor

[caraudioguy2100]

The original transistor is marked P1D which is a PMBTA42 I believe

I’m trying to replace it with An A42 transistor are the pin configurations the same or different ?

 

[BKnut]

datasheet link of removed A42. The pin layout is on the datasheet

A42
Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

 

[Perry Babin]

It's likely a PZTA42. The smaller PMBTA won't take the heat that the larger package will.

 

[Indiglo]

The PZTA42 is a sot223 package, the PMBTA42 is a sot23 package.
The sot223 centre pin and tab is the collector, pin 1 is the base and pin 3 is the emitter.
P1D and A42 seem to be the same device but in different packages, but this is not always guaranteed. See this SMD Codebook

 

[BKnut]

Thanks indiglo, I've download the codebook for my thick electronic bible.

 

[caraudioguy2100]

I’m wondering if the original P1D and the A42 have the same pin configuration?

The A42 is only for testing to see if there are any other faults in the amp

Or if there is another transistor I can put in for testing only

 

[Perry Babin]

Did you look up the datasheet(s) for the pin configuration?