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'[EE] Depletion mode MOSFETs'
2004\11\01@055857 by 8859-9?B?1m1lciBZYWxo/Q==?=

I am not a hardware guru, one schematic I was looking at mentiones the need for a Supertex MOSFET Depletion Mode N-Channel DN3535 to be specific.  DigiKey does not carry this product, although Mouser does.  However, I would like to find a replacement for the part from other manufacturers as well.  Any ideas or suggestions?  The datasheet notes that following data are important characteristics, and therefore DN3535 is chosen:

FET Type: N-Channel Depletion Mode
Idss: 24mA min
BVds: 21 V min
Vpinchoff: 3.3 V max
Power Dissipation: 24mA x 21 V min (504 mW)


So I need a replacement for it with above critical data.  Any help is appriciated.

Regards, Omer

____________________________________________

2004\11\01@065427 by Spehro Pefhany

picon face
At 12:59 PM 11/1/2004 +0200, you wrote:
>I am not a hardware guru, one schematic I was looking at mentiones the
>need for a Supertex MOSFET Depletion Mode N-Channel DN3535 to be
>specific.  DigiKey does not carry this product, although Mouser
>does.  However, I would like to find a replacement for the part from other
>manufacturers as well.  Any ideas or suggestions?  The datasheet notes
>that following data are important characteristics, and therefore DN3535 is
>chosen:
>
>FET Type: N-Channel Depletion Mode
>Idss: 24mA min
>BVds: 21 V min
>Vpinchoff: 3.3 V max
>Power Dissipation: 24mA x 21 V min (504 mW)
>
>
>So I need a replacement for it with above critical data.  Any help is
>appriciated.

Probably overkill, but try Clare/IXYS. There are not many manufacturers of
depletion-mode MOSFETs.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




____________________________________________

2004\11\01@080106 by Russell McMahon

face
flavicon
face
>I am not a hardware guru, one schematic I was looking at mentiones the need
>for a Supertex MOSFET Depletion Mode N-Channel DN3535 to be specific.
>DigiKey does not carry this product, although Mouser does.  However, I
>would like to find a replacement for the part from other manufacturers as
>well.  Any ideas or suggestions?  The datasheet notes that following data
>are important characteristics, and therefore DN3535 is chosen:
>
> FET Type: N-Channel Depletion Mode
> Idss: 24mA min
> BVds: 21 V min
> Vpinchoff: 3.3 V max
> Power Dissipation: 24mA x 21 V min (504 mW)


Of the 19 distributors accessed in a single search from http://www.findchips.com
only Mouser had the term "depletion" mentioned !!! They sound like a good
place to shop in this case!

The FET mentioned seems to have a vastly higher spec than what you specify.
You can easily judge voltage and current yourself.
Pinchoff voltage is probably the only critical voltage. It should have the
opposite polarity to the main operating voltage as the FET is normally on
when Vgate is zero and is "depleted" to turn it off by applying a negative
voltage to the gate. A depletion mode FET with a Vp <= 3.3 volt would
probably work OK.
Note also that on resistance (10 ohms for the DN3535) may be quite variable
between devices. Check this for original and substitutes and see if it
matters in the target circuit.


       RM

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____________________________________________

2004\11\01@094122 by Dan Kerl

flavicon
face
mer Yalhý wrote:
> I am not a hardware guru, one schematic I was looking at mentiones the need for a Supertex MOSFET Depletion Mode N-Channel DN3535 to be specific.  DigiKey does not carry this product, although Mouser does.  However, I would like to find a replacement for the part from other manufacturers as well.  Any ideas or suggestions?  The datasheet notes that following data are important characteristics, and therefore DN3535 is chosen:
>
> FET Type: N-Channel Depletion Mode
> Idss: 24mA min
> BVds: 21 V min
> Vpinchoff: 3.3 V max
> Power Dissipation: 24mA x 21 V min (504 mW)
>
>
> So I need a replacement for it with above critical data.  Any help is appriciated.

Since Siemens/Infineon has canned the BSS135, the Supertex parts are the only high-voltage depletion-mode fets I've been able to locate after several years of looking. (I was never able to find a small-quanity US distributor for the Siemens/Infineon part anyway). I wouldn't know what to suggest for a second source. Is the Vds max low enough to use some kind of JFET?

-Dan
___________________________________________

2004\11\01@111430 by Omer YALHI
flavicon
face
Vds is stated as 21 V min.  Maybe all this is an overkill.  The depletion
mode mosfet is suggested in the AD421 datasheet, and I am trying to find
alternatives for it.  They suggest one with 350V!

Regards, Omer

____________________________________________

2004\11\01@114643 by Dan Kerl

flavicon
face

Omer YALHI wrote:

> Vds is stated as 21 V min.  Maybe all this is an overkill.  The depletion
> mode mosfet is suggested in the AD421 datasheet, and I am trying to find
> alternatives for it.  They suggest one with 350V!

From the datasheet
http://www.analog.com/UploadedFiles/Data_Sheets/409317160AD421_c.pdf  (pg 6)

"The DN25D FET transistor from Supertex meets all the above
requirements for the FET. Other suitable transistors include
ND2020L and ND2410L, both from Siliconix."

I don't know the current production status of the suggested Siliconix parts, but
they might be a viable second source.

I suspect that a long loop installed in a noisy environment might be subject to
some rather high voltage impulse noise, hence the suggestion for a high Vds.

-Dan


____________________________________________

2004\11\01@142331 by Omer YALHI

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Thank you Dan.  

I did see the alternatives in the datasheet but I could not find them using
findchips either.  I have found DN3535 though, and one of the datasheets
suggests that can also be used, so I will go ahead and use that one.

Regards, Omer

{Original Message removed}

2004\11\02@052146 by Peter L. Peres

picon face

On Mon, 1 Nov 2004, Dan Kerl wrote:

> Since Siemens/Infineon has canned the BSS135, the Supertex parts are the only
> high-voltage depletion-mode fets I've been able to locate after several years

Argh, you shot my BSS170 proposal down.

Peter
____________________________________________

2004\11\02@052152 by Peter L. Peres

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part 1 756 bytes content-type:TEXT/PLAIN; charset=iso-8859-9; format=flowed (decoded quoted-printable)


On Mon, 1 Nov 2004, [iso-8859-9] Ömer Yalhı wrote:

> I am not a hardware guru, one schematic I was looking at mentiones the need for a Supertex MOSFET Depletion Mode N-Channel DN3535 to be specific.  DigiKey does not carry this product, although Mouser does.  However, I would like to find a replacement for the part from other manufacturers as well.  Any ideas or suggestions?  The datasheet notes that following data are important characteristics, and therefore DN3535 is chosen:
>
> FET Type: N-Channel Depletion Mode
> Idss: 24mA min
> BVds: 21 V min
> Vpinchoff: 3.3 V max
> Power Dissipation: 24mA x 21 V min (504 mW)

Look at BSS170 imho. TO92 and probably smd available.

Peter

part 2 79 bytes content-type:text/plain; charset="us-ascii"
(decoded 7bit)

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