Topswitch-JX verses HX

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The HX seems to provide a little more peak power than the JX.  Is the HX a good choice for new designs?

I don't know which particular power level and which devices you are refering to. There are a few differences between JX and HX including package, no load consumption etc. Comparsion is listed in JX datasheet page 19. Both products are released products and supported by our company.  They both ok for your new desings. You can choose the either one which is more suitable to meet you system requirement.