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Old 17th October 2013, 06:13 PM   #1
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Default transister

Sorry for stupid question im still in school. Is a 2sa5200 and 2sa1943 npn the same thing. when I test its the same but opposite each other. like the base is reversed. the data sheet appears to be the same though. Can I change out with either one.
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Old 17th October 2013, 06:17 PM   #2
Mooly is offline Mooly  United Kingdom
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There is a 2SC5200 ??? Just recheck the number.

2SA and 2SB are PNP and 2SC and 2SD are NPN.
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Old 17th October 2013, 06:19 PM   #3
Mooly is offline Mooly  United Kingdom
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If your using a digital meter on diode range then the NPN will read when the red lead is on the base and the black is on either emitter or collector. The PNP is the opposite, black lead on the base and red to C or E.

The meter reading (if on diode range) shows the volt drop across the junction such as 0.637
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Old 17th October 2013, 06:20 PM   #4
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If you measure from the Collector to the Base and then the Emitter to the Base; the PNP and NPN will appear to reverses of each other.
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Old 17th October 2013, 07:29 PM   #5
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Quote:
Originally Posted by Mooly View Post
If your using a digital meter on diode range then the NPN will read when the red lead is on the base and the black is on either emitter or collector. The PNP is the opposite, black lead on the base and red to C or E.

The meter reading (if on diode range) shows the volt drop across the junction such as 0.637
Hi. The main question I have is are these 2 transisters the same thing? Yes they are 2sa1943 and 2sa5200. thanks
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Old 17th October 2013, 07:38 PM   #6
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Hi Not sure if I posted correcly when i replied last. My main question is are the 2sa5200 and the 2cs1943 the same part. the data sheet is the same? Can they interchange with each other?
Thanks for the help
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Old 18th October 2013, 06:22 AM   #7
Mooly is offline Mooly  United Kingdom
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I think I see where your confusion is coming from.

The data sheets for each transistor mentions the other device.

The 2SC2500 which is NPN is the complement to the 2SA1943.

They are not the same, one is the "opposite" of the other. The NPN device must have the collector positive with respect to the emitter, the PNP device has the emitter positive with respect to the collector. You would use these to make a push-pull amplifier output stage.

If you look at the data sheet the 2SA device as a negative sign in front of all the specs.
Attached Images
File Type: jpg 2SA1943.JPG (83.7 KB, 23 views)
File Type: jpg 2SC5200.JPG (82.5 KB, 23 views)
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