Author Topic: Mosfet Array  (Read 3590 times)

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roger kerr

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Mosfet Array
« on: June 18, 2015, 04:46:38 am »
I am having trouble finding a mosfet array containing an array of independent mosfets similar to a transistor array.  I dont want to be restrained to logic levels but current shouldnt be an issue.  I want to keep a minimum parts count.  Any thoughts or suggestions?
 

Offline Jeroen3

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Re: Mosfet Array
« Reply #1 on: June 18, 2015, 06:00:18 am »
What is the purpose of the mosfets? There are about 5k in digikeys "FETs - Arrays" category.
 

roger kerr

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Re: Mosfet Array
« Reply #2 on: June 18, 2015, 08:20:00 am »
 Hi,  well I did do the lazy google thing,Jeroen3 and I wasnt very successful (including digikey, etc.).  And I have been looking at the parts lists used in other designs containing multiple mosfets and I really havent found something satisfactory.  I would like to make a flexible interface to independently drive/control a number of different devices using different voltage levels and different current levels.   If I require more power for a particular output I can always add a discrete mosfet  to one of the outputs of the array.  I have found one device FDC6401N of the type Im looking for but it only contains 2 independent mosfets.  I was hoping for at least 4. Thanks for responding.

 

roger kerr

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Re: Mosfet Array
« Reply #3 on: June 18, 2015, 08:25:56 am »
I have thought of using a relay bank to  do this and it would  work but thats quite crude and I was hoping for a more elegant solution.
 

Offline sleemanj

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Re: Mosfet Array
« Reply #4 on: June 18, 2015, 09:25:11 am »
I think realistically that when we are talking about SOT-23 or smaller surface mount MOSFETs, there isn't a great need to develop single packaged arrays of multiple fets.

With that said, you could look at the TPIC6259 and variants
http://www.ti.com/product/tpic6259
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Offline Jeroen3

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Re: Mosfet Array
« Reply #5 on: June 18, 2015, 09:44:52 am »
Maybe you find what you need of you search for smart high or low side switches.
Those are available in arrays, but have a relatively low power rating.
 

Offline rs20

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Re: Mosfet Array
« Reply #6 on: June 18, 2015, 10:07:21 am »
Er, as Jeroen says, there's 5000 on digikey. What are all of those options lacking?
 

Offline T3sl4co1l

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Re: Mosfet Array
« Reply #7 on: June 18, 2015, 05:11:48 pm »
Hi,  well I did do the lazy google thing,Jeroen3 and I wasnt very successful (including digikey, etc.).  And I have been looking at the parts lists used in other designs containing multiple mosfets and I really havent found something satisfactory.  I would like to make a flexible interface to independently drive/control a number of different devices using different voltage levels and different current levels.

Yeh, you'd make a great politician... ::)

What's satisfactory?

What min/max volts, amps?  Switching rate?  Protection (short/overcurrent, inductive/over voltage, ESD, surge, ??)?

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

roger kerr

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Re: Mosfet Array
« Reply #8 on: June 18, 2015, 07:27:11 pm »
Thank you everyone.  Im looking at the suggestions put forward.  Not exactly what I had originally thought was a straight forward question.  I had thought that if I found the right device I would build a ckt around it.  I think I need to go back to the drawing board and better define my requirements as is being gently suggested by Tim.  I think one of the difficulties Im challenged with is that its difficult to put very much power into a small pkg and hence they arent really available.    ALD114804  is one that I just found but I dont think it is sufficient for what Id like.  So thank you all and Ill close this post. 
 


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