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LF: STW34NB20 - used in a number of MF and LF PA designs

To: "[email protected]" <rsgb_lf_[email protected]>
Subject: LF: STW34NB20 - used in a number of MF and LF PA designs
From: Laurence KL7 L <[email protected]>
Date: Fri, 10 Oct 2014 07:16:20 -0800
Importance: Normal
Reply-to: [email protected]
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Im sure a few people have been thru this loop but as this is now an obsoleted item does anyone have any (tested) recommendations for a Class D or E TO-247 replacement - Id like to go up to 600V Vds (the main reason the 34NB20 typically fails in a "fault" condition here), stay around the 30A or greater, improve the drain source resistance (that's where the money is) and keep input cap low, and improve or at least equal the rise and fall times.
 
The ones Im looking at, and Im sure there a loads more according to Mouser
STW45N65M5STW54NM65NDSTW70N60M2
 
But as they are nearly 20 bucks each or more expensive than the 34NB20 Im looking for . I know I can get similar devices to the NB20 for lowish cost but my main "want/need" is to increase the Vds (I think!)
 
Any ideas or pointers welcomed. Direct or via board
 
Laurence KL7L WE2XPQ
at the moment dawn till dusk  WSPR 474.2 dial USB and DFCW10 475.010 2Hz offset dash high XPQ 300W every 6 mins
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