High temperature SiC FETs

"Tim Williams"

wrote:

about the regular devices that, although the

operate at very high temperatures, it's something

contacts to the stuff, or the metallization, or

which actually has a substantially lower

aren't losing much by putting them in regular 150-175C

*should* be able to handle high temps like they say,

somewhere making them... I don't have any

other extreme enviroment stuff unfortunately.

where they've run die at 500 C for 2000+

applications. This was like, more

were these guys.

say 225 degree C max operation

this data sheet says

225 C max operating

storage temperature ??

made with parts that ~could~ run

ineffiecient. I can see using a high

application but not in a

application.

so storage conditions

persuade a large oil

downhole instruments was to

refrigerator (a bit like a

regime). These are

heater, three heat

tubes. They're used

volume in a 250C ambient

normal COTS components

the parts for each

unfortunately, but it was fun learning

go.

regulators..shux.

it's a

cost

for

services outfit, but

against downhole refrigeration

Stirling

with all

the

thermoacoustic fridge

part is

a length of

having

"Puttin' a

cold beer, Bob.

huh huh. That's ol'

boyl

can't see how you could cool that length with the type of cooler you're suggesting.

typically be between 10 to 100ft long. If the string is very long a couple of runs may be made with shorter strings, but time is (lots off) money in this game.

Okay, so use more than one cooler. No worries.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

that, although the

temperatures, it's something

metallization, or

substantially lower

them in regular 150-175C

high temps like they say,

don't have any

stuff unfortunately.

500 C for 2000+

like, more

operation

~could~ run

a high

a

conditions

oil

was to

a

are

heat

They're used

ambient

fun learning

refrigeration

That's ol'

see how you could cool that length with the type of cooler you're suggesting.

A really long heat pipe could extend from downhole up to a big ice chest in the truck, with a heatsink nestled among the beer cans.

Or, less refreshing, pump some high pressure gas down there and cool by expansion.

--

John Larkin                  Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

Maybe a 2" casing 6 miles long and 15,000 psi.

(50mm, 10km, 100MPa)

Cheers

--
Syd

that, although the

temperatures, it's something

metallization, or

substantially lower

them in regular 150-175C

high temps like they say,

don't have any

stuff unfortunately.

at 500 C for 2000+

like, more

operation

says

~could~ run

using a high

in a

conditions

oil

instruments was to

like a

These are

heat

They're used

ambient

components

each

fun learning

a

but

refrigeration

fridge

a

Bob.

That's ol'

can't see how you could cool that length with the type of cooler you're suggesting.

But the pressure down there is higher than in the gas bottle. Where would it expand to?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

Williams"

devices that, although the

temperatures, it's something

the metallization, or

substantially lower

putting them in regular 150-175C

high temps like they say,

don't have any

stuff unfortunately.

at 500 C for 2000+

like, more

max operation

says

??

~could~ run

using a high

in a

conditions

large oil

instruments was to

like a

These are

heat

They're used

250C ambient

components

each

was fun learning

it's a

but

refrigeration

fridge

"Puttin' a

Bob.

That's ol'

can't see how you could cool that length with the type of cooler you're suggesting.

A return tube, presumably.

--

John Larkin                  Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com   

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

Only partly silly. Nothing in the package of a 200C or higher part will be soldered normally. Even in the early 1970s high temperature stuff was all welded or wire bonded if that was the scale. For devices to operate at=20

500 C, that is near diffusion drive in temperatures for silicon (800 to 1100 C) and will definitely limit lifetime. Except for lead (solders), tin (solders), Woods metal(s), bismuth, gallium, indium, mercury, = aluminum and a few others metals (elemental) melting points are generally above 1500 C.

See:

?-)