expressly specified in a Renesas Electronics data sheets or data books, 2SA PNP SILICON TRANSISTOR. DATA SHEET. Document No. 2SA datasheet, 2SA pdf, 2SA data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, PNP General Purpose Amplifier. 2SA V, mA. PNP Plastic Encapsulated Transistor. Jan Rev. D. Page 1 of 2 Any changes of specification will.
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Discussion in ‘ Solid State ‘ started by roger2Aug 1, Log in or Sign up. Working on a Kenwood KR receiver and suspect one of these of being bad. I downloaded the 2SA data sheet but it does not mention the A. It does show Q and P as being hfe ranges.
What does the A suffix mean? The “A” suffix usually designates a higher voltage rating.
2SA NEC PNP SILICON TRANSISTOR ChipFind Datasheet Archive |
But I don’t see it on any of the A spec sheets. Where did you come up with a 2SAA? The reference is from both the parts list and schematic of Kenwood KR It is written just like in my OP. I can’t see the faces of actual parts well enough to read.
I am hesitant to remove them because I have already reflowed once. They both had “halo” cracks in their solder joints. One channel was intermittent. After the reflow it straightened up almost completely Then I heard another brief cut-out. They are also in series? Datashewt I say in series I mean that the collector of the 2saA connects directly to the emitter of the 2sa I was able to get a look at one of them with a small lighted magnifier.
On the face it says: Datashest unlikely to be of much relevance. Just replace with ksa and call it a day. ZOOMAug 2, ZOOM, I am asking what the “A” suffix for 2sa means because I want to know what type of part the designers had in mind for this position in the amp.
Inquiring minds want to know things. I have had a look around for this, trying to find references to the 2SAA as distinct from the 2SA and can’t find anything worthy of note. Is this transistor in a high gain position?
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HyperionAug 2, They Kenwood did the same thing in the kr manual. But they are only using it as a current limiter, and my opinion is that it doesn’t mean anything, and is just a glitch that got into their computer. Also, there is no 2scA, just 2sc which is the normal complement of 2sa It is always purely related to higher voltage, not to higher current rating.
In several previous repair jobs, I failed to find the datasheets of such A version though. If you really need to replace it, just make sure that the voltage between C-B doesn’t exceed 60V, and between C-E doesn’t exceed 50V. OilmasterAug 2, I appreciate the time you put into researching this. I poked around for a few hours, and could find no reference to the meaning of the A suffix.
Here is the left channel of KR The two transistors being discussed are Q15, the 2sa Aand Q17, the 2sa I checked DC voltages and found a fairly close match to what is shown on the schematic, slightly higher but everything in correct relative proportions. The red voltage markings on the schema are by Kenwood. Is this the VAS, or some other stage? JURBAug 2, The “A” suffix means new and improved.
JURB – Thanks for the detailed explanation of transistor designations. Good to know about the existence of those Japanese transistor data books too. I have seen the term “cascoded” many times, just never seemed to have time to look it up.
Now I know what it means, and the parts choices made by Kenwood make more sense based on your description. But I did take some live readings, they were pretty close to what the schematic shows.
Here is L channel, R is almost the same: Turns out there was a 2scA, at least briefly.
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I actually had the datasheet for it on my PC. I was looking all over the web datsheet 2saA with no luck: As you pointed out, 2sc is the complement to 2sa, so I would assume that the “A” version of 2sa has similarly increased temperature ratings. In any case, a mystery is solved, and I have learned a few things here. Thanks again to all JURB – thanks for taking the time to type in those specs for the non-A 2sa Actually I found that one OK, just couldn’t find anything for the A version.
My go to for older transistor or semi-conductor info is datasheetarchive. I’m sure it is not as good as those professional trade manuals that you have. But it has most things that are datashedt too obscure. You must log in or sign up to reply here. Share This Page Tweet.
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