2SC3503+2SA1381 E or F source?

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#24
AndrewT said:
The KTA1381/c3503 show a high Cob of ~4.6pF @ 10Vce
The front page states 2.6pF and 3.1pF @ 30Vce
Something wrong with the datasheet?
And this is higher than a 2sc3503 which is shown as 3.3pF @ 10Vce.
Click to expand...

Dear Andrew,

KEC KTC3503 versus fairchildsemis KSC3503 datasheet. see attached picture.

BR, Toni
 

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#28
kf_tam said:
Besides the 2SA1381/2SC3503, it seems to me that 2SA1371/2SC3468 (TO-92L) and 2SA1380/2SC3790 (TO-126ML) are essentially the same transistors in different packagings. Their datasheets look mostly the same except in dissipation and ASO.
Click to expand...

2SA1380/2SC3502 is OK just a bit lower dissipation but equally hard to find.
2SC3790 is complement with 2SA1480 also excellent choice.
 
#29
I have 1500 pairs of Fairchild KSA1381E/KSC3503E for sale. Both are same gain group but one have gain 125-145 and the other one have 155-175. Very easy to get very close N-N and P-P matched pairs. But close matched N-P pair is difficult.

BR
Joshvi
 
#30
dadod said:
2SA1380/2SC3502 is OK just a bit lower dissipation but equally hard to find.
2SC3790 is complement with 2SA1480 also excellent choice.
Click to expand...

Meant to type 2SA1480 but came out wrong :headbash:

For the 2SA1380/2SC3502, Ampslab has them.

For myself, I went cheap and went to taobao to buy 100 pairs 2SA1480/2SC3790 (minimum order amount) at ~USD$0.1 per piece. I reckon that particular packaging is less common (seems only Sanyo uses it) and the price is rock bottom.
They turn out to be OK on Locker's curvetracer.
 
#31
joshvi said:
I have 1500 pairs of Fairchild KSA1381E/KSC3503E for sale. Both are same gain group but one have gain 125-145 and the other one have 155-175. Very easy to get very close N-N and P-P matched pairs. But close matched N-P pair is difficult.

BR
Joshvi
Click to expand...

KSA1381E are still available from fairchild. I have more as 2000 of them on (private) stock. hFe ranges from 127 - 152

KSC3503D are also available from fairchild semi. Also more as 2000 on (private) stock. hFe ranges from 72 - 81.

KSA1381 and KSC3503 F-grade are wanted at a reasonable price from a second source like KEC (KTC3503-Y or KTA1381-Y), not from private stock ...
 
#33
I entered "taobao 2sa1480/2sc3790" into google and a page came back showing many dozens of differently priced options in chinese.
Varying from 0.80 to 9.80
I tried to use Google translate by adding the page address into the google translate, but that has got stuck at "loading description"
I don't know what I would be trying to buy.
Any ideas on how to get to see an english readable page @ taobao?
 
#34
astx said:
KSA1381E are still available from fairchild. I have more as 2000 of them on (private) stock. hFe ranges from 127 - 152

KSC3503D are also available from fairchild semi. Also more as 2000 on (private) stock. hFe ranges from 72 - 81.

KSA1381 and KSC3503 F-grade are wanted at a reasonable price from a second source like KEC (KTC3503-Y or KTA1381-Y), not from private stock ...
Click to expand...

cwtim01 said:
Why not just buy the original Fairchild 2SC3503F/2SA1381F?

https://www.rocelec.com/parts/details/?part=56ccfa07e4b0b1b46e075c01&build=0
https://www.rocelec.com/parts/details/?part=56ccfa07e4b0b1b46e075c08&build=0
Click to expand...
I bought many E grade and got only 2pair that were fairly closely matched for hFE. and my highest D grade don't match up with lowest E grade either.
 
#37
AndrewT said:
Look at the graph.

That's why I asked if there is a mistake in the datasheet?
Click to expand...

Dear Andrew,

you are right. There is a relatively big difference in Cob graph compared to the overall data ...
We need some real parts to compare ... but KEC doesn't answer ...

BR, Toni
 

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