Sander deWaal wrote:

Pooh Bear said:

Modern semiconductors are being improved all the time. The consequent low
demand for old ones makes them uneconomic to continue maufacturing.

2SK135/ 2SJ50 for instance? :-)

I'm afraid your premise falls at the first hurdle - unless you like
unimprovable old products.

Like the above MOSFETs, for instance.

I am puzzled why Hitachi dropped those devices. Low demand maybe ? They
continued to make equivalents in TO-3P. It's also suggested that Hitachi
didn't want to keep making metal can devices.

You can still get equivalents in metal can from Semelab and Exicon though.
Nice devices.


Graham