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Old 5th December 2007, 01:05 PM   #1
borges is offline borges  Norway
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Default Dual FET recomendation

Anybody here used dual FET transistors? I'm looking for small-signal dual NMOS and dual PMOS for a new project.

I'm building a differential passive IVC, and I would like the transistors for the two phases to be well matched and at the same temperature.

The transistors I have found online are mostly power devices. I have no need to run 8A through them, a 30mA bias current will be just fine.

The other thing I may need is a relatively high Vds, at least 25V.

Any suggestions appreciated.


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Old 5th December 2007, 01:27 PM   #2
glen65 is offline glen65  United States
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What type of package are you looking for? Or does it matter?
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Old 5th December 2007, 05:57 PM   #3
borges is offline borges  Norway
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The package doesn't really matter.

I have used dual PNPs and NPNs that were some sort of tiny package where I couldn't route between the pins. That worked out okay, but I wouldn't mind having a bit more space to play with.

The application I'm working on (common gate impedance transformer that keeps a DAC's current output at a relatively steady voltage) is a very good fit for an NMOS but not as suited for other transistor topologies.

I checked at Farnell. They have some transistors that are probably worth testing, but those are beasts that can sustain 8A and thereabouts.


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Old 5th December 2007, 07:26 PM   #4
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Default Dual FETs ...

Try linearsystem.com ... They advertise in AudioXpress all the time ...

or look at That Corp:

http://www.thatcorp.com/icprod.html

Good Luck !
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Old 5th December 2007, 07:39 PM   #5
borges is offline borges  Norway
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That Corp. have some nice looking bipolars. I may use those in my output stages. I wish they had similar FETs too.

www.linearsystem.com points to the amplifier manufacturer PSS. It doesn't look like they deal in transistors. Could you specify the link please?

Thanks,
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Old 5th December 2007, 08:24 PM   #6
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Default Linear Integrated Systems ...

Try googling Linear Integrated Systems ... The Google link will take you to http://www.linearsystems.com/, the chip maker ...

Good luck !
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Old 5th December 2007, 08:37 PM   #7
glen65 is offline glen65  United States
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On Semiconductor might be worth looking into.
Here are a couple of examples, these are for dual mosfets
http://www.onsemi.com/pub/Collateral/MMDF1N05E-D.PDF

http://www.onsemi.com/pub/Collateral/NTJD4001N-D.PDF

They’re all surface mount so they might be a bit more tedious to work with. Just go to their website and start searching if you want to see more.
http://www.onsemi.com/PowerSolutions...PowerSolutions
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Old 6th December 2007, 11:27 AM   #8
borges is offline borges  Norway
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Thanks Glen,

some of those parts from ON-semi look very nice. I'll start requesting samples.

I'll be making proto PCBs of this circuit anyway, so I don't mind them being SMDs.


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