Transistor data with sorting

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#82
Not capturing pwr transistor features

Hi Greg,

Magic stuff and much appreciated..

If I may suggest columns for min/max hFE with Ic for power types.

I have been deliberately selecting ON Semi 4281/4302 family devices for their very flat gain over the SOA currents up to around 5A. hFE(min) at 10A or more has no value or meaning in this context.

Cheers
John
 
#83
Hi, I'm looking for a good and readily available replacement for differential input pairs in vintage amplifiers. These are commonly 2SA942 and 2SA750 or similar (and obsolete) variants. Judging from my own search, as well as this spreadsheet, it seems that the only available replacements are KSA992 and 2SA970 (latter apparently discontinued). This is really troubling as they are hard to come by.

Any other suggestions would be greatly appreciated.

🙂
 
#84
As you find, Greg's small signal transistor list covers current requirements but I assume by vintage, you mean low Vceo as was the norm in UK vintage types at least. I'm referring to a T092 PNP range that would be covered well now by BC556,7,9,60, MPSA56 etc.

The advanced types such as 2SA970, 992 of course are great with low noise and high Vceo but if 50V Vceo is OK, Toshiba's brilliant low noise 2SA1015/C1815 are EOL but a handful would last most lifetimes. Fairchild's KSA1015/C1815 aren't yet EOL so you have a choice. Alternatively, read earlier in this thread as several members posted comments with their nominations when the list was compiled. The general advice is buy through-hole part stocks now because "readily available" will not be the case for such low-demand parts for long.

Occasionally, when I see types like BC307,414 etc, I know the designer has tried for lowest noise possible and would pick the best I could find as a replacement. Self even moans about obsolete LTP types in his Trimodal amp chapter but plenty of old amps used shoddy stuff too, so where do you stop refining vintage sound?

Anyway, 'hope this is helpful.
 
#85
Added 2SC2838 / 2SA1187

Hi,

Time for the 2013 update 😉

I have added 2SC2838/2SA1187 to this: Output Transistors

Note: I am not sure it is obvious, but if you click on the transistor name in the first 2 columns it will take you to the datasheet.

Johno,

I have read your suggestion but at the moment I am just doing quick and dirty dump of a few datasheet specs. If I redo the format of the data I will review all suggestions. 🙂

regards
 
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#86
Greg Erskine said:
Hi,

Time for the 2013 update 😉

I have added 2SC2838/2SA1187 to this: Output Transistors

Note: I am not sure it is obvious, but if you click on the transistor name in the first 2 columns it will take you to the datasheet.

Johno,

I have read your suggestion but at the moment I am just doing quick and dirty dump of a few datasheet specs. If I redo the format of the data I will review all suggestions. 🙂

regards
Click to expand...

Hi Greg, great stuff - really useful. Just noticed a slight mistake in the table. For 2SC2922 / 2SA1216 Sanken pair Ic is 17 A, not 27 A.

Cheers,
Valery
 
#88
Greg Erskine said:
Hi,

I have updated the Small Signal Transistors table to improve readability and add a few requested features and columns. I will update the other tables to make things more consistent in due course and after feedback.

Small Signal Transistors

I have changed the style sheet to remove colour and underlining from links. I felt it was making the appearance untidy and making it more difficult to read.

I have added tool tips, so if you move your cursor over some of the areas of the table you should be getting a tool tip giving you an instruction or more information.

The notes column now has abbreviated notes, but a tool tip should give expanded information. LN = Low noise, HB = High beta. The extra notes like LC = Low cost, O = Obsolete, etc will be added here.

Just a word about how I am doing this. These tables are all hand coded html and this does have limitations compared to a database solution. Although the tables look very simple, the html is getting big, about 800 lines. Cutting and pasting errors are going to occur, so reporting errors is important.

regards
Click to expand...

in this case the Information from post #12 about
http://www.diyaudio.com/forums/parts/253580-bc546-type-to126-2.html#post3869496
seems to be very interesting
 
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