2sk1530, 2sj201

[jackinnj]

Toshiba appears to be obsoleting these parts -- notice from Digikey:

Obsolete Parts Notification

You have purchased the following part number(s) from Digi-Key within the last two years. The manufacturer has announced this part(s) will become obsolete. Please click on the link below for more information on possible substitutes.
Manufacturer Details
TOSHIBA Description: MOSFET N-CH 200V 12A TO-3PL
Manufacturer Part Number: 2SK1530-Y(F)
Digi-Key Part Number: 2SK1530YF-ND

[zhoufang]

Thanks for the info!
I wonder why Avnet did not tell me this, I will verify this info with them tomorrow.
2SK1529/2SJ200 is already gone, now it is EOL for the big brother.
IR/Vishay has P channel problem, Fairchild discontinued FQA12P20.
What's left for good vertical Power MOSFET?

[jackinnj]

I wonder if Vishay's problem relates moving production from Italy to China, I don't know -- early on the devices were very consistent, then the values were all over the lot.

[HaflerFreak]

I got it too:
You have purchased the following part number(s) from Digi-Key within the last two years.
The manufacturer has announced this part(s) will become obsolete.
Please click on the link below for more information on possible substitutes.


Manufacturer Details
TOSHIBA Description: MOSFET N-CH 200V 12A TO-3PL
Manufacturer Part Number: 2SK1530-Y(F)
Digi-Key Part Number: 2SK1530YF-ND

Seems like every time I hear about a good part for audio... The above says it all

[zhoufang]

Originally Posted by HaflerFreak

I got it too:
The manufacturer has announced this part(s) will become obsolete.

There might still be time for last buy orders.
Although such things happen all the time for good audio parts, it is shocking that while I just finished matching and start selling this pair, it is discontinued.
Anyway I think Digike severely overpriced this pair. The pair could have been more popular if it is more accessible/affordable.

So for now we still have the following good power MOSFET pair:
2SK3497/2SJ618
2SK1058/2SJ162
Any more?

[h_a]

2SK1058/2SJ162

If I remember correctly, these are lateral mosfets with much lower transconductance compared to verticals. Not a 1:1 substitution.

Have fun, Hannes

[zhoufang]

h_a:
you are right.
I'm trying to list all the good for audio Mosfet complementary pairs, not just direct substitute.
Even so I can't find many good pairs.
I must have left out some.

[Bob Cordell]

Originally Posted by jackinnj

Toshiba appears to be obsoleting these parts -- notice from Digikey:

Obsolete Parts Notification

You have purchased the following part number(s) from Digi-Key within the last two years. The manufacturer has announced this part(s) will become obsolete. Please click on the link below for more information on possible substitutes.
Manufacturer Details
TOSHIBA Description: MOSFET N-CH 200V 12A TO-3PL
Manufacturer Part Number: 2SK1530-Y(F)
Digi-Key Part Number: 2SK1530YF-ND

I just got the notice from DigiKey, but only for the 2sk1530. I have ordered 201's recently as well, but have not gotten a notice for them. I googled on the 1530 and looked on Toshiba America's site and did not see anything to the effect of it being discontinued. I'd love for it to be mistake. This is a terrible shame if it is happening. I don't know how many commercial amplifiers out there use the 2sk1530/2sj201 combination.

These are not only electrically very good, but the fact that they are in the larger TO-264 package gives them almost twice the metal contact area with the heat sink, significantly reducing thermal resistance through the insulator.

I hope someone will contact Toshiba directly to get the true, full story, including why, if it is true. If it is true, maybe if they get enough feedback from the audio community they will reconsider.

Let's also post the manufacturer and model of those power amplifiers that any of us know of that use these devices, particularly those that are still in manufacture.

There have been many part numbering changes over the last couple of years, many in regard to the introduction of ROHS. Sometimes parts have been discontinued, or appear to have been discontinued, because of such numbering changes. However, I think the 1530s that I got the notification on were already ROHS. Don't get me started on what an incredible waste of money the whole ROHS thing has been.

Cheers,
Bob

[zhoufang]

I have asked Avnet to verify with Toshiba, and will keep everyone notified of the result.

[h_a]

larger TO-264 package gives them almost twice the metal contact area with the heat sink

Yeah, that's a nice feature, though it makes self cut pads necessary.

I also find it pretty impressive that National finds in their appnote that these vertical Toshibas produce less distortion as follower than even laterals. Would be a shame to discontinue them.

I think the 1530s that I got the notification on were already ROHS

Yup, they are already compliant.

Have fun, Hannes