Toshiba 2sk370 and 2sj108

[jacco vermeulen]

Originally posted by Charles Hansen
a replacement

I don't even need to cross the border to buy lots of either dually type in numbers of 50 to 25.000, with any production code ranging from '94 to '05.
For the less cunning/private persons overhere it's starting to make more sense to look for aluminium hat 2SJ73/2SK146.
At the start of the production of the 7-legged creatures, shop list prices were 1/4th of the 600mW duo in a pan.
The same shops that sold me the matched in a box types during your first Avalon model period still have a few leftovers right now, for close to the same rate as charged for the 3-year old obsoletes at the scarse place that still offers single number doubled JFETs.

Production cost of the last generation single and dual JFETs must have been very much lower due to the case standardisation and sticking two on a single substrate, at the cost of lower power handling and oddities.
Through my eyes, the Japanese discrete semiconductor industry has shown virtually no innovation over the last decade and a half, logic analysis points to possible successors as step-down and less versatile devices.

Chris,
i've got a lot of friends and relatives who belong to the dark side, they refer to something else when they talk about evil white S...

[anatech]

Hi Jacco,

i've got a lot of friends and relatives who belong to the dark side, they refer to something else when they talk about evil white S...

LOL!
Thank you!

Hi Charles,
I have noticed that trend from On Semi. This is exactly what was needed. Now, if we could only get On Semi making dual fets and some not expensive dual BJT's in a leaded package. A matched PNP and NPN in the same package would be really cool.

Looks like I should check some later samples. Most of the other numbers I received where all over the map.

If you know Mark Busier personally, give him a big thank you! His efforts have been noticed and are appreciated. I've been recommending On Semi parts as soon as I saw the MJW bits. If the others are as good now, that would be fantastic!

-Chris

[Charles Hansen]

Originally posted by anatech
Now, if we could only get On Semi making dual fets and some not expensive dual BJT's in a leaded package. A matched PNP and NPN in the same package would be really cool.

If you know Mark Busier personally, give him a big thank you! His efforts have been noticed and are appreciated. I've been recommending On Semi parts as soon as I saw the MJW bits. If the others are as good now, that would be fantastic!

Mark had plans for a lot of things, including dual BJT's. I think the reality is that it takes a long time to bring these things to market. Mark is now only acting as a consultant to OnSemi. He has a company making Peltier refrigerators for pleasure boats, I think. But the audio program is still in action, and they are slowly adding things to the lineup. Mark's boss and the man still running the program is a guy named Todd Visconti. If you know any OEMs, please have send them to Todd and have them buy as much product as possible. The more they sell, the more cool products they will make!

[Charles Hansen]

Originally posted by jacco vermeulen
Production cost of the last generation single and dual JFETs must have been very much lower due to the case standardisation and sticking two on a single substrate, at the cost of lower power handling and oddities.

Exactly so. The only reason they stopped making the dual monolithic parts was that the case was obsolete. There was talk of making the dual monolithics in SMT packaging (eg, SO-8), but I haven't seen anything yet...

[Charles Hansen]

Originally posted by luvdunhill
Glad to see you around here! I don't mean to "put you back to work" so soon, but do you by any chance know of a suitable replacement for the RFG60P06 and IRCP054 devices? I am under the impression that such devices are not really available these days and these were items of a bygone era, but when I say that you popped up again, figured I'd ask

Both of those parts have been discontinued for several years. We found a replacement for one (I think it was the IRCP054) that was actually a better part, although without the current sensing pins. That's OK, because we can just set the bias by measuring the current through the rail fuse.

The problem is that part has also now been discontinued! We bought a few thousand just for repair stock.

If you have a V-3, just send it to the factory and we can fully update it. Call Michael at 303-442-7300 x223 and he can quote a price.

If you are building an amp from scratch, I would recommend using lateral MOSFET's such as the Exicon (Semelab) rather than vertical MOSFET's. Or better yet, the ThermalTrak bipolar outputs.

[Zen Mod]

Originally posted by Charles Hansen


Exactly so. The only reason they stopped making the dual monolithic parts was that the case was obsolete. There was talk of making the dual monolithics in SMT packaging (eg, SO-8), but I haven't seen anything yet...

silly ; probably decision of some bureaucrat
they make the case; only they can make it obsolete

[anatech]

Hi Charles,
Actually, as I find cool devices I do make it known the best I can. I'm just a technician and can only yell so far. Still, every piece counts.

I am very careful not to abuse the samples program, but some people do. They've tightened it up to a point where ordering samples is sometimes not worthwhile.

If you get a chance to talk with either Mark or Todd, they need drivers and predrivers as well as signal devices. The predrivers would work in the Vas position as well. Surface mount devices are not welcome due to thermal issues. It's also a little difficult for small operations and hobbyists to get boards made for surface mount. Many commercial manufacturers I've seen do a very poor job of thermal modeling. It's also more difficult to thermally couple devices for tracking purposes.

Sometimes the old ways are the best. I don't mind working with surface mount stuff, just those occasions where leaded devices would be better.

Thanks Charles. You're lucky to be so close to the upper end of the supply chain. What are your thoughts on smt's?

-Chris

[bocka]

The only reason they stopped making the dual monolithic parts was that the case was obsolete. There was talk of making the dual monolithics in SMT packaging (eg, SO-8), but I haven't seen anything yet

Toshiba 2SK2145 and 2SK3320 Dual N-Channel JFETs, but unfortunately no P-Channel JFETs