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Old 14th February 2014, 11:11 AM   #1
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Default Will anybody interest in stamp size ccs module?

The other day I was searching 01N100D in mouser. By a few clicks I discovered some other interesting depletion mosfet. They are the SIPMOS SM-Signal Transistor, SMD device made by Infineon. One of the most promising one is BSP135 which is available in SOT223 package, 600V, 120mA, but with a discouragingly small power dissipation: 1.8W.

http://www.infineon.com/dgdl/BSP135_...3c1fd4c839399b

A quick simulation in LTspice reveals that, if we are taking well care of the maximum dissipation(ie Vds x current <=1.8w) this can be a very nice ccs. With only two SMD stopping resistors and two SOT223 on the board, the remaining 500ohm multi-trimmer determines the tiny PCB footprint. And hence a stamp size ccs module can be made with four pins out:

A) High voltage in
B) mu-follower output/out1
C) Anti-triode output/out2
D) connect to the plate/normal CCS output

You don't need to use all the three outputs, either one is good enough.

Ok, here comes the question. I knew some freelance electronic makers in China that may accept order quantity less than few hundreds. If all of these(custom PCB+parts+installation+testing) can be made within $4USD excluding shipping, will anybody interest in a group purchase?
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Last edited by sulcorebutia; 14th February 2014 at 11:36 AM.
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Old 14th February 2014, 11:16 AM   #2
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And no, I am not looking for business opportunity, anyone interested in this idea can make the product and sell it to the community.

For your reference, here are the simulation files:
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File Type: zip bsp135.zip (11.9 KB, 25 views)

Last edited by sulcorebutia; 14th February 2014 at 11:21 AM.
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Old 14th February 2014, 08:43 PM   #3
multi is offline multi  Australia
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Will anybody interest in stamp size ccs module?
I would be very interested.
Phil
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Old 14th February 2014, 08:52 PM   #4
Gluca is offline Gluca  Italy
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I would be interested. 15mA and 50V drop is 0.75W ... there's plenty of headroom if used in preamps
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Old 15th February 2014, 05:55 AM   #5
ymwong is offline ymwong  United States
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I would be interested.
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Old 15th February 2014, 10:37 AM   #6
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Thanks all for your reply. Is there anything you want to add to this stamp size board, say for example, a 20mA SMD LED in series of the top mosfet? Or what kind of additional feature you want for this board? Any circuit ideas or modification are more than welcome.
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Old 15th February 2014, 01:49 PM   #7
Magz is offline Magz  United States
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I prefer to build my own p2p, but this could be Very useful for retro-fitting existing circuits where space is at a premium.
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Old 15th February 2014, 02:11 PM   #8
TheGimp is offline TheGimp  United States
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This is a SMT device that requires proper pad layout for thermal dissipation, otherwise you will not get near that dissipation level witout exceeding the device TJmax.
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Old 15th February 2014, 02:15 PM   #9
ctaudio is offline ctaudio  United States
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I'd be interested and I'd suggest some gate protection diodes.
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Old 15th February 2014, 08:11 PM   #10
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I would be interested for 10+ pcs.
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