Dual FET recomendation

borges · 5th December 2007, 01:05 PM

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.

Børge

glen65 · 5th December 2007, 01:27 PM

What type of package are you looking for? Or does it matter?

borges · 5th December 2007, 05:57 PM

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.

Børge

torroid88 · 5th December 2007, 07:26 PM

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

or look at That Corp:

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

Good Luck !

borges · 5th December 2007, 07:39 PM

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,
Børge

torroid88 · 5th December 2007, 08:24 PM

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

Good luck !

glen65 · 5th December 2007, 08:37 PM

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

borges · 6th December 2007, 11:27 AM

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.

Børge

5th December 2007, 01:05 PM	#1
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	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. Børge

5th December 2007, 07:26 PM	#4
torroid88 diyAudio Member Join Date: Nov 2005	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 !

5th December 2007, 08:24 PM	#6
torroid88 diyAudio Member Join Date: Nov 2005	Linear Integrated Systems ... Try googling Linear Integrated Systems ... The Google link will take you to http://www.linearsystems.com/, the chip maker ... Good luck !

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
6'' to 7'' woofer recomendation?	GOWA	Multi-Way	12	14th February 2011 04:43 PM
Need a recomendation on this	icecoolwas	Car Audio	2	21st August 2009 09:02 PM
Full range driver recomendation for dual mono LM3875 gainclone?	zebra100	Full Range	5	4th August 2009 07:23 AM
Enclosure recomendation for ono	audio_cf	Pass Labs	1	14th August 2005 11:38 PM
KT88 Recomendation	Milzie	Tubes / Valves	9	15th July 2003 03:29 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

5th December 2007, 01:27 PM	#2
glen65 diyAudio Member Join Date: Jun 2004 Location: mid Ohio USA	What type of package are you looking for? Or does it matter?

5th December 2007, 05:57 PM	#3
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	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. Børge

5th December 2007, 07:39 PM	#5
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	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, Børge

5th December 2007, 08:37 PM	#7
glen65 diyAudio Member Join Date: Jun 2004 Location: mid Ohio USA	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

6th December 2007, 11:27 AM	#8
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	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. Børge

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read