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The popularity of the Fairchild 40N60 was primarily due to its early easy availability and package type, which makes it easy to install / remove.
Performance wise, almost any IGBT with similar ratings will work for most of the smaller to mid-size DRSSTCs. Sure, the thermal characteristics of the SOT-227 package are much better than a TO-247, but if your DRSSTC is running properly (i.e. good soft switching), you'll find heat dissipation to be very minimal. My IGBTs barely get warm after running them, even after significant periods.
I've had lots of luck with the following low-cost IGBTs from IXYS.
Of course, there are other vendors selling similar parts.
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DRSSTC - Suitable IGBTs
