The N5380B is a differential SMA adapter for the InfiniiMax I and II Series of probe amplifiers that allows differential SMA connections to a single channel of the oscilloscope.
The N5380B is a replacement of the N5380A. The N5380A will be discontinued in June 2012 and will be supported for 5 years until September 2017. The old and new replacements are 100% form, fit, function and price equivalent to the product it replaces.