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sulcorebutia 14th February 2014 11:11 AM

Will anybody interest in stamp size ccs module?
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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.

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?

sulcorebutia 14th February 2014 11:16 AM

2 Attachment(s)
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:

multi 14th February 2014 08:43 PM

Will anybody interest in stamp size ccs module?
I would be very interested.

Gluca 14th February 2014 08:52 PM

I would be interested. 15mA and 50V drop is 0.75W ... there's plenty of headroom if used in preamps

ymwong 15th February 2014 05:55 AM

I would be interested.

sulcorebutia 15th February 2014 10:37 AM

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.

Magz 15th February 2014 01:49 PM

I prefer to build my own p2p, but this could be Very useful for retro-fitting existing circuits where space is at a premium.

TheGimp 15th February 2014 02:11 PM

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.

ctaudio 15th February 2014 02:15 PM

I'd be interested and I'd suggest some gate protection diodes.

matejsirk 15th February 2014 08:11 PM

I would be interested for 10+ pcs.

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