Help identify RCA7852, RCA7902

brutepuppy · 21st November 2008, 08:55 AM

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

KB8DNS · 23rd November 2008, 07:34 PM

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?

Rod KB8DNS

brutepuppy · 23rd November 2008, 11:07 PM

It's similiar to a TO-52 style. How can they be identified with DVM?

KB8DNS · 24th November 2008, 01:11 AM

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

brutepuppy · 25th November 2008, 07:45 AM

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

21st November 2008, 08:55 AM	#1
brutepuppy diyAudio Member Join Date: Jun 2008	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 __________________

23rd November 2008, 07:34 PM	#2
KB8DNS diyAudio Member Join Date: Oct 2008 Location: Michigan's upper peninsula	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? Rod KB8DNS

23rd November 2008, 11:07 PM	#3
brutepuppy diyAudio Member Join Date: Jun 2008	It's similiar to a TO-52 style. How can they be identified with DVM? __________________

24th November 2008, 01:11 AM	#4
KB8DNS diyAudio Member Join Date: Oct 2008 Location: Michigan's upper peninsula	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

25th November 2008, 07:45 AM	#5
brutepuppy diyAudio Member Join Date: Jun 2008	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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