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This report presents the DC, pulsed I-V, small signal, and large signal characteristics of Freescalepsilas 48 V GaN HFET technology. Characterization of large signal performance for a 12.6 mm at 48 V drain bias shows 89 W output power with an associated power density of 7.1 W/mm, linear gain of 17.5 dB, and a power-added efficiency (PAE) of 62%. Analysis of channel temperature over drain bias shows that the maximum channel temperatures at 28 V and 48 V are 107 degC and 245 degC, respectively during saturated RF operation. Data for RF drift over time on a 16.2 mm device show less than 0.2 dB of RF drift for >1000 hrs. of testing. This level of RF performance represents a significant >4 dB gain and >2 W/mm power density improvement over Freescalepsilas previously reported GaN HFET technology.