I can think of two reasons to want metal cased small signal parts, hermetic seal, 200°C maximum junction temperature.
Apparently Microsemi is still making to-5 transistors. http://www.mouser.com/Semiconductor...s/Bipolar-Transistors-BJT/_/N-ax1sh?P=1z0sx03
I can think of two reasons to want metal cased small signal parts, hermetic seal, 200°C maximum junction temperature.
Diodes Inc e-line can do 200C junction