awesome

http://www.nitronex.com/solutions/NPT35050 RF Power Transistor V1.3.pdf


John

 

John Larkin wrote...

Whether it's awesome or not depends on the price.

 

That's awesome too. $120 in small quantity.

John

 

Not for some of us ;-)

...Jim Thompson

 

It certainly is, Ollie!

Can it be used at lower frequencies, such as 2.5Ghz?

 

The price depends on the volume bought.

 

120 volts. 90 watts. 25 amps. 8 mhos. 200 C. All I need to know now
are the capacitances.

I want to use it in a wideband amp, 1-250 MHz maybe. It's input
matched for 3.5 GHz, so I figure the matching will be invisible at 250
MHz, practically DC. At 2.5 Ghz it should be partially matched, but
probably tunable. The drain is unmatched, fine with me.

As soon as I blow one up, I'll open the can and see what's inside.


John

 

How can its maximum operating junction temperature be greater than its
maximum storage temperature?

Bob

 

If the junction was not the most temperature sensitive part of the
assembly.

 

Well, they have no devices yet from what I was told. Maybe in a
year or so.

 

Yes, impressive, these new semiconductor materials.

Rene

 

Those things really leak a lot- several watts could be lost to leakage
in the 'off' condition.

Might make a nice audiophile class-A amplifier.

Best regards,
Spehro Pefhany

 

Actually, that RF centric device would be quite expensive to
incorporate into an audio amp, regardless of whether it would work or
not. There a far far cheaper devices that are as good as they need to
be for such a design.

 

Seems kind of open-ended. Surely if these guys can hear a staggering
difference between cheap and expensive AC line sockets, response well
into the hundreds of MHz may not be overkill.


Best regards,
Spehro Pefhany

 

Make that "phase linearity" any you'll sell more.

 

The frequency isn't high enough. I need to make a crystal controlled
3.XXXXXX*10^14Hz signal. I'd take a lower power though.

 

I was talking about price, not working capacity.

Gold cans likely are though.

 

The rep dropped off an eval board here, with a gadget on it. He claims
we can get parts, but these exotic semiconductors do always seem to be
six months off. They've added a "P" in the front of the part number,
on the pdf datasheet, and he claims that means "production." We'll
see.

When/if we can get them, they will be a pretty radical change to the
way people design wideband RF power amps.

John

 

Like the old germanium transistor amps with just a cap into the
base... self biasing! But a few watts of leakage won't be lethal for a
200 watt class AB push-pull amp, probably less than the normal
quiescent power.

John

 

Still cheaper than a 300B.

John