Re: MAT 04

John Larkin wrote:
On Tue, 06 Oct 2009 16:48:48 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:

John Larkin wrote:
On Tue, 06 Oct 2009 15:33:47 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:

John Larkin wrote:
On Tue, 6 Oct 2009 11:14:30 -0700 (PDT), osr@xxxxxxxxxx wrote:

Just got a "Its Obsolete" notice from Digikey on MAT-04 in DIP. Say it
aint so...


Steve
The part is apparently going away in all packages.

Everybody email Analog or a distributor and demand that the MAT-04 be
saved!

They'll go by the sales numbers. If too low it'll be snuffed out. Problem is the price tag, it's a boutique part that is most likely used only by scientists. Us regular people usually only need temp tracking and then 50 cents usually do the trick:

http://www.fairchildsemi.com/ds/FF/FFB2222A.pdf
Are those separate, isolated die? Amazingly, they don't say.

If isolated die, thermal tracking will be mediocre.

I recently did some static and transient thermal tests on the UPA800
dual RF transistor. That's two chips, and thermal coupling was
shockingly bad.

It isn't great. Best is to put a blob of goo over it and place them away from any moving air.

The real problem is differences in power dissipation driving
differences in Vbe. I think the MAT-04 was an interleaved structure to
minimize that. The separate-chip things are terrible that way.


True. Problem is, most likely only one out of 100,000 engineers ever needed that. And only for one unit.


For monolithic you are pretty much stuck with FETs
(CD4007) if it has to be cheap. The rest is all either sliding towards lalaland or carries boutique pricing.

The only truly matched ones in current production I know of is the THAT300 series that Bill mentioned. Out of Taxachusetts, of all places, Four bucks a pop, I guess they'll make you support their state-run health care if you buy ;-)

http://www.thatcorp.com/datashts/300data.pdf

It's DI so I'm guessing the transistors aren't interleaved. No die
photo.


At their prices they should be able to furnish that information. Worst case you'd have to pop one open.


Hans Camenzind probably isn't too far away from you guys and he used to offer some sort of bone-simple custom chips. You were very limited in resistors and such so I never liked the concept but he could probably give you an array in a jiffy by leaving everyhting out and piping as many transistors as there are pin for:

http://www.arraydesign.com/

I wish the ECL guys would offer a chip with uncommitted devices in there. That would really rock.

There are some insanely fast transistors available in arrays, but by
the time they wirebond the bits out to pins, they tend to turn into
oscillators.


I've had Japanese RF transistors that came as arrays in SIP packages and they were very behaved.

Hans' stuff wasn't very fast, those chips should behave. But I am not sure how old he is now and whether he still offers the service. Maybe he could be bribed with some Swiss chocolate :-)

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
.

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