Pinout needed: Telefunken 603 tranisistor

Guessing OC603. Package info sounds right, and it checks out right for type, but a little later than 50's. Transistors didn't really start getting into consumer stuff until the early sixties. I couldn't find any package data in any of my old books, but the connections to blacked-glass transistors with domed tops, was usually as you say ie E-B-C with the collector marked with a red dot. Sometimes, there was also a slightly larger space between the B-C legs, than the E-B legs. My data says that AC125 is good enough equivalent

Arfa

I would agree with Arfa that the most likely part number you have is an OC603, and your assumption is correct. C-B-E with the red dot indicating the Collector. Its main use is as a low noise preamplifier at low voltages and low power.

My old Mullard equivalent book shows the OC603 as equivalent to the AC107.

Data for the Ge PNP AC107 is;

Vcb 15V Vce 15V Veb 5V Ic 5mA Ptot 83mW

By comparison the AC125 is more typical of an audio preamplifier or driver transistor. ie,

Vcb 32V Vce 32V Veb 10V Ic 200mA Ptot 500mW

Ross H

PS. forgot the hfe (small signal gain) is 60 and f alpha cut-off freq (common base cct) is 2MHz.

hFE (large signal or DC current gain) is 100 and f1 (freq at which hfe = 1) is 1.7MHz.

From 1973 manual

OD603 (confirmed OD not OC) by Telefunken pnp Ge Vcbo 40 Vceo 30 Ic max 10mA Ptot 30mW Icbo at Vcbo 0.025 uA

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

n cook schrieb:

O_D_ 603? Are you really sure? That's a Ge pnp transistor for AF power stages! From 1969 manual:

abs. max. ratings ________

-Vcbo 40 V I I metal case

-Vceo 30 V __I_______I__

-Vebo 10 V I_____________ICollector connected to case

-Ic 3 A ||| Ptot 6 W @ tcase < 45°C ||| C: blank wire ||| B: yellow insulation ||| E: green insulation |||

O_C_ 603 Ge pnp transistor for low noise input-stages.

abs. max. ratings ___

-Vcbo 22 V / \

-Vceo 12 V I I case: black painted glass

-Vebo 10 V I I

-Ic 50 mA I I Ptot 50 mW @ tamb = 45°C I___I

Yes curious, the 1973 UK Semicon data book mentions the data as I transcribed along with manufacturer being Telefunken, also mentions a variant OD603/50. But a German 1987 ECO (Electronic+Acoustic GmbH) book mentions the one you refer to along with variant OD603, but no mention of Telefunken, completely different characteristics. Crossposted to de.sci.electronics

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics

Thanks, everyone.