MICROELECTRONICS. 2N/91/ 2N/94/ COMPLEMENTARY SILICON POWER TRANSISTORS. 2N, 2N, 2N AND 2N ARE . Characteristics of the 2N bipolar transistor. Type – p-n-p; Collector-Emitter Voltage: 40 V; Collector-Base Voltage: 40 V; Emitter-Base Voltage: 5 V. Manufacturer Part No: 2N Order Code: Technical Datasheet: 2N Datasheet. Availability: No Longer Manufactured. See all Technical Docs.

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2N – 2N part cross-reference datasheet –

I’ve been unable to find any datasheet on this item and don’t know whether it’s original or a substitute from an earlier rework. The new topic will begin with this message. Hopefully this will help with interpretation of my earlier msg. Datsheet of the LeCroy shots has parameters overlaid showing min and max voltages reached – as does the single Rigol shot taken simultaneously.

Use a mica washer when mounting on a metal surface. On Mon, Oct 8, at The soldering does not look original.

I have plenty of photos and waveforms from diagnostics so far but I’m 2n51993 sure how to upload them or link them to this post. Reason Report to Moderators I think this message isn’t appropriate for our Group. If you had a spare lying around it would be good to have one available.


I’ll bet the B in B is an 8 and if so is a date code. So the problem seems to lie on the power supply board. The photo titles show the channel allocations to the rails.

The Group moderators are responsible for maintaining their community and can address these issues. I can post some annotated scans of the relevant schematic parts if that would help. At present, I’m just looking for advice on whether this part of the supply is particularly sensitive to the characteristics of Q, details of what the full identifier for the Motorola B might be and where I might find a datasheet, and advice as to whether the 2NG is a suitable replacement and, if not, what to use instead.

Your email is included with the abuse report. Will check my box of scraps. I’ll presume for now the 2N is working OK and move on. There’s also one expanded timebase shot from the LeCroy showing the U op-amp output into the base of Q and its correspondence with movements on the -5V rail, which starts its downward trajectory but is derailed by the positive shift at Q base and doesn’t recover.

(PDF) 2N5193 Datasheet download

Substituting a 2NG for the B hasn’t made any difference. Reed Dickinson toggle quoted message. My eyes are not what they used to be. Search Only Within This Topic. And closer inspection shows you’re right that it’s not B Biggest challenge is finding enough time to do the diagnostics.


I hope that will shed some more light. Seems that’s the way it should be. Hardware shot simply shows the Motorola circled red. This cannot be undone.

I’ve started to compare how the -9V and -5V supplies are behaving as the first appears to be working fine and the second is not and they’re not very dissimilar subcircuits and use the same op-amp. Also can anyone make use of some fast switching diodes and other parts? Q’s Tek part number for my ‘s datashset number isfor which Sphere lists dtasheet as a substitute. In this case the device is connected to datashert large pad on the Subject of the new topic: Presume there’s guidance on the site somewhere – will try some more searching.

As far as I can tell U and Q are behaving as expected but I can find no bad passives on the -5V supply sub-circuit.

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