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-   -   MJL3281 / MJW3281 differences? (http://www.diyaudio.com/forums/solid-state/120780-mjl3281-mjw3281-differences.html)

gmikol 4th April 2008 08:59 PM

MJL3281 / MJW3281 differences?
 
Other than the physical dimensions of the case?

Looking at the data sheets, I don't see any other difference. Even the Theta-JC's are the same, although, intuitively, I would think the TO-264 package should have a lower thermal resistance.

So all you experts out there, is there any difference?

The MJW's are $0.51 cheaper per piece in small quantities, so if there's no real benefit to the MJL's, I'd rather save a little bit.

--Greg

MikeB 5th April 2008 08:33 AM

Its the same transistor (die) in a different package. It has less metal plate to heat sink transfer. This means that the MJL has better cooling.

Mike

megajocke 5th April 2008 02:01 PM

The JC-thermal resistance might be the same but the bigger case will have an advantage when it comes to case-sink theta, especially when using an insulator between.

Zero Cool 5th April 2008 02:05 PM

I thought the W versions were a higher rated version???? the MPSA42/92 vs the MPSW 42/92 has the W version at twice the dissipation. i thought....

gmikol 5th April 2008 04:39 PM

Quote:

Originally posted by megajocke
The JC-thermal resistance might be the same but the bigger case will have an advantage when it comes to case-sink theta, especially when using an insulator between.
Well...if that isn't a forehead-slapper. This was the benefit I suspected must be there, but wasn't thinking about it in the right way. I'm all straightened out now.

Thanks--

Greg


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