Help identify RCA7852, RCA7902 - diyAudio
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Old 21st November 2008, 08:55 AM   #1
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Default Help identify RCA7852, RCA7902

I have two 3-pin metal can IC's or transistors or regulators used in a power supply kit that are schematically shown as transistors. One is NPN and the other PNP.
The Numbers are across the top- RCAIA15 middle-RCA bottom- 7852 and on the other across the top- RCAIA16 middle- RCA bottom- 7902
Which one is P and which is N? I can't find them anywhere.

bp
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Old 23rd November 2008, 07:34 PM   #2
KB8DNS is offline KB8DNS  United States
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Default re: Help identify....

The 7852 and 7902 must be date codes, the 52nd week of 1978... You can identify them with a DVM but I cannot seem to find the numbers either. What is the package style? and can you post some jpgs?

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Old 23rd November 2008, 11:07 PM   #3
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It's similiar to a TO-52 style. How can they be identified with DVM?
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Old 24th November 2008, 01:11 AM   #4
KB8DNS is offline KB8DNS  United States
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Default re: Help identify

Transistors have junctions and you can check them as you would a diode. To get used to doing this check a known transistor for example and practice with other types.... TO3, TO92... ect....
Your unknowns will have unique specs and readings but the generalities will be like other transistors, PNP or NPN.

Rod KB8DNS
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Old 25th November 2008, 07:45 AM   #5
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I guess these may be bad. I can get no readings from one pin to another in any combination.
many thanks for your help.
and have a happy thanksgiving

Ray
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