tiny GaN fets

To be fair, for their intended application there's a premium on sub-nanohenry inductances. I reverse-engineered the drive circuit of a long-range vehicular lidar a few years back--it had one of those FETs dumping a few-nanofarad capacitor charged to ~40V into a triple-stacked diode laser, producing a pulse of several amps, about 5 ns wide.

I measured the waveforms and made an LTspice model that matched extremely well--200 pH in the drain and 180 pH in the source, for a total of less than 400 pH for the entire circuit. (And all at pH 7. ) ;)

Cheers

Phil Hobbs

Am 02.06.21 um 17:49 schrieb snipped-for-privacy@highlandsniptechnology.com:

I did solder them in with just a little bit of hot air. Very little, or you won't find them again.

It was surprisingly easy.

onsdag den 2. juni 2021 kl. 19.15.02 UTC+2 skrev Gerhard Hoffmann:

or maybe a hot plate?

You might get a pcb, or part of one, an make some size converters similar to the surface mount to dip in concept. Considering the numbers Phill mentioned, you'd probably need to exercise care. A nice group of .25 by .375 inch pcbs with the fets mounted and ready to be diced and soldered edgewise up to larger boards.

Hul

snipped-for-privacy@highlandsniptechnology.com wrote:

We did make some adapter boards, to experiment with the parts.

I've done a few mouse-bite baby boards with the EPC parts and drivers and such, as throw-aways in case we blow one up.

John - you sound well ahead of what I suggested. Those tiny packages are truelly approaching die size devices.

Hul

snipped-for-privacy@highlandsniptechnology.com wrote:

Mechanically, they are horrendous. But electrically, they are magical, and replace bipolars and mesfets and phemts that are EOL now.

Cheap, too.

Here's a 25 volt pulse into 50 ohms, from a 50 volt supply, a totem pole of two of the tiny 4-ball parts.

Dr Fauci says to wear a mask so you don't blow them away with your breath.

What did that poor FET ever do to you?

I don't abuse innocent baby ganfets. That's just the way it came, next to an 0603 resistor for scale.