National has a 1999 rev date on it. That doesn't qualify as original :-)
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Well, there ain't no market to write home about. They are mostly used when people need really low noise or in the linear bricks where the vendors would like to not have to put any additional R&D whatsoever into them.
If you want something more modern you'll have to go for a LT1575 or similar chips:
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But they cost almost an order of magnitude more and aren't as versatile.