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Old 29th January 2007, 11:30 AM   #1
Stuey is offline Stuey  Australia
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Default Cross referencing Toshiba transistors

Hi guys,

I'm new to refurbishing older amps, and need some transistors to replace 2 Toshiba complimentary pairs of 2SA1263 and 2SC3180.

Has anyone any suggestions of currently available transistors that will suffice? I'm not sure if the cross referencing on various websites is reliable enough.

Which parameters must be matched in the replacements?

Cheers and thanks

Stuey
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Old 29th January 2007, 01:10 PM   #2
AndrewT is online now AndrewT  Scotland
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Hi,
Quote:
Which parameters must be matched in the replacements
Pin pitch, Power, Ic, Vce0, SOA @ rail voltage, hFE, Ft, Cob, or exceeded if a close match is not possible.
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Old 29th January 2007, 01:38 PM   #3
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Although a lower Cob would be preferable

If the devices are TO247/TO3P case then Toshiba's 2SA1943/2SC5200 will be fine, as will Motorola's MJL3218/MJL1302 or MJL21193/MJL21194.
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Old 29th January 2007, 02:10 PM   #4
Pars is offline Pars  United States
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Both bdent and MCM have these in stock. I would recommend BDEnt if you need a specific gain range (not sure if these particular transistors have different gain classes or not... MCM is clueless when it comes to that however).
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Old 30th January 2007, 09:49 AM   #5
Stuey is offline Stuey  Australia
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Thanks for the replies.

The package is SOT-93, so I'm assuming the TO-247 legs can be manipulated to fit... Not only that, but my usual electronics store has them.

I have heard of one repairer using TIP2955/TIP3055 (which is in the same case - SOT-93) but I'm assuming the Motorolas are more suitable? They are certainly more expensive! Still, I'd prefer quality. This is a gift repair for someone.

Pars, I'll have a look at those links. I didn't think the originals were still available.

Cheers again.

Stuey
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Old 30th January 2007, 10:18 AM   #6
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SOT-93 is basically TO-3P is basically TO-247.

3055/2955 devices are a cheap and poor replacement not upto the spec of the original devices.
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Old 30th January 2007, 10:28 AM   #7
Stuey is offline Stuey  Australia
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Thanks Richie...I appreciate your input.

As for the format, I've found that it's correctly a TO-3P case anyway; I was wrong.

I'll try the links Pars gave, otherwise I'll buy the local Motorolas. I meant above that my local store has the MJL21193/21194. At least at AU $9 and $11 each respectively, they are probably genuine...!

Cheers

Stuey
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Old 30th January 2007, 05:18 PM   #8
AndrewT is online now AndrewT  Scotland
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the 21193 is nowhere close to the Tosh 1263.

I thought you asked for an equivalent.
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Old 30th January 2007, 10:13 PM   #9
Stuey is offline Stuey  Australia
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I asked for a replacement that will suffice. I'm assuming that Richie listed those because they exceed my requirements...?

In any case, the links Pars provided both list the originals. I'll try them first.

Thanks everyone

Stu
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Old 30th January 2007, 10:31 PM   #10
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I listed the alternative devices in order of preference. The MJL2119x devices whilst not stellar performers are very robust and will be fine as replacements. Certainly a lot better than 3055/2955 ones.
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