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Old 30th May 2001, 01:10 PM   #1
Eric is offline Eric  United States
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Hi Everyone, I have a quick question concerning some output transistors (MJ11015 & 16) I have found on the web. <a href="http://search.newark.com/part_detail_vend.phtml?PART_ID=7966&VID=250&10005= 07F8527&ORDER_SOURCE_REMOTE=ON">Newark</a> has them for $3.13, and <a href="http://www.dckits.com/semis2.htm">DC Kits</a> has them for $8.65. Is there some significant difference (such as different manufactures, different "quality", etc.) that I am missing here, or does the price difference just reflect the relative sizes/volume of business of these two vendors?

Also, does anyone know where I can find the temperature/current dissipation curves for the MJ11015&16s? I have found several data sheets (Newark has one) but they don't contain temperature curves...

Thanks!
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Old 30th May 2001, 01:32 PM   #2
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Default Try on semiconductor

On semi conductor will have all available data sheets for those transitors. Is dc kits selling a mathced pair?
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Old 30th May 2001, 01:43 PM   #3
Eric is offline Eric  United States
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No, they don't appear to be matched pairs at CD Kits... I've looked at the On-Semi site - found everything but the temperature curves... guess I'll look again! Thanks!
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Old 30th May 2001, 01:49 PM   #4
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Default well then

On semi conductor makes them so if they don't have the data then it is probably only been tested at some big company and is not available to the public. I just reread your post, I'm not quite sure what you are asking for but it seems that the data you want will heavily depend on the heatsink used.
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Old 30th May 2001, 02:12 PM   #5
Eric is offline Eric  United States
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Default well, kinda...

Yes, the output will depend on the specific heatsink and thermal insulator, but there are usually graphs that indicate at junction (or case) temperature X, the transistor can dissipate a maximum of Y watts or something like that. Therefore, these graphs are more universal in that you use your heatsink and thermal insulator data to calculate what the junction (or case) temperature will be. This way, you can see how close to Pd you are running the transistor.
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Old 30th May 2001, 02:46 PM   #6
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Default Thermal resistance

It states a max thernmal resistance of .87degc/w junction to case on page 1 and has the derating based on temp.
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Old 30th May 2001, 02:59 PM   #7
Eric is offline Eric  United States
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Talking Guess I overlooked it...

Thanks! Guess in all of my efforts to find the graph, I didn't read what they actually WROTE.. oops, thanks!
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