ASZ17

The ASZ17 is a low-frequency germanium PNP power transistor made in section 2200 (germanium devices) of IPRS Băneasa [1]. The section’s lines came from the Electronica works in 1962, and it stopped making germanium devices in 1982; having only the cover of IPRS’s germanium catalogue, the book reconstructs the list of the section’s products from prospectuses and publications up to 1989 [1].

The Agenda radioelectronistului (2nd edition, 1989) lists the ASZ17 among the bipolar transistors made by IPRS Băneasa, in the group of low-frequency germanium PNP power transistors, in a TO-3 package [2].

Coded as (Pro Electron system) [3]:

Part	Meaning
A	base material with an activation energy of 0.6–1 eV, e.g. germanium (0.67 eV)
S	low-power switching transistor
Z17	serial number for components for professional use: a letter (X, Y, Z…, with no coded meaning) and two digits (10–99)

The coding table counts a device as low-power when its thermal resistance junction–ambient is above 15 °C/W [3]; the Agenda’s own table gives the ASZ transistors 1.5 °C/W and 45 W [2].

Vce sat measured at IC = 10 A [2].