Semiconductor Diode Component Needed

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docrobgar Commentator Join Date: Feb 2007 Location: Wales UK. Tel. +44(0)1446 741180 Posts: 72	Semiconductor Diode Component Needed 04/12/2007 8:51 AM
	I have a requirement for a device that essentialy is a pair of back-to-back power silicon diodes in one package, with a current capacity of +or-10 Amps and a PIV of a 2 Volts max. Yea- 2 Volts Thats all, but must be an isolated package with the possibility for efficient heat sinking and be as small in dimentions as possible-Any Ideas? __________________ INDI-LINK makes 'Light' of 'Current' events, a veritable window into wiring.
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BrainWave Guru Join Date: Feb 2006 Posts: 962	#1 Re: Semiconductor Diode Component Needed 04/12/2007 2:54 PM
	I have searched high and low but can not find a parts to match your requirements. The PIV is the stumbling block Why do you need such a part? Can another part be used? Knowing the application would help. I source parts all day and night. __________________ There's them that knows and them that just thinks they know, whitch are you? Stir the pot and see what rises up. I have catalytic properties I get a reaction going.
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GW Guru Join Date: Oct 2006 Location: Surrey BC Canada Posts: 1571 Good Answers: 42	#2 Re: Semiconductor Diode Component Needed 04/12/2007 11:15 PM
	Forward drop is at least 0.7 volts. 10 Amps will dissipate 7 watts at .7 volts, or 10 watts at 1 volt. This is not a small device and will need a heat sink. Now about that 2 volts, so what if it is 50 volts or 100? Are your diodes in anti-parallel or back to back series? 2 terminal device or 3? Details please. Try MBRF1045 in an isolated TO-221E, Schottky Rectifier.
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#3 Re: Semiconductor Diode Component Needed 04/13/2007 5:41 AM
	When you specify a PIV of 2V max: are you saying you want it to break down if the reverse voltage is greater than 2V, or are you just saying that you hoped you could get a part which meets your other requirements in a smaller package if you really relaxed the PIV spec. Why do you especially want a single package? When you say back to back, do you mean common anode? 3 pin package? __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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Electroman Guru Join Date: Jul 2006 Location: Dunstable, England Posts: 2821 Good Answers: 45	#4 Re: Semiconductor Diode Component Needed 04/13/2007 11:15 AM
	I read the question as being he wants a package with 2 diodes back to back, which to me means they are in parallel and reversed polarity, so the peak forward voltage will always be 1 volt or less as one or the other diode will be conducting..?? Unless he means in series connection, then he would need 2 2 volt zeners to give his PIV of 2 volts??? Strange whatever.... John. __________________ A little knowledge is a dangerous thing - Googling is far worse!
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docrobgar Commentator Join Date: Feb 2007 Location: Wales UK. Tel. +44(0)1446 741180 Posts: 72	#5 In reply to #4 Re: Semiconductor Diode Component Needed 04/13/2007 12:07 PM
	My double diode, back to back device is required to act as a resistor of negative resistance that develops a fractional voltage across it of 1.2 Volt Max. I believe the PIV rating of a diode is proportional to the thickness of silicon used in their manufacture. As size is important I need this thickness to be minimal. At present I am using a diode bridge with AC and DC terminals shorted out to form such a component albeit with double diodes but I suppose this give some redundancy to any failure of one set. PIV is not imortant as you say. __________________ INDI-LINK makes 'Light' of 'Current' events, a veritable window into wiring.
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#6 In reply to #5 Re: Semiconductor Diode Component Needed 04/13/2007 12:43 PM
	What about one of these:- http://www.irf.com/product-info/datasheets/hirel/om5209sc.pdf __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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GW Guru Join Date: Oct 2006 Location: Surrey BC Canada Posts: 1571 Good Answers: 42	#7 Re: Semiconductor Diode Component Needed 04/15/2007 12:54 PM
	If that is a continuous 10 amps (not pulsed) you will need a significant heak sink. How are you planning on doing that? The heat sink will be much larger than the diodes.
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cnpower Guru Join Date: Sep 2006 Location: CHINA Posts: 2945 Good Answers: 14	#8 Re: Semiconductor Diode Component Needed 04/17/2007 11:20 PM
	you can find it from net, for example irf has wonderful such large power diode pair for selling.
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BrainWave (1); cnpower (1); docrobgar (1); Electroman (1); GW (2); Randall (2)

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