m00dawg Posted September 26, 2011 Report Share Posted September 26, 2011 I am working on creating a daughter-board for my LED Matrix which will include the shift-registers for the buttons and LEDs. But I'm having trouble getting things to work well if I put my SMD shift registers on the bottom of the board. I wanted to do this so that the SRs would not be sandwiched between the LED matrix board itself and the daughter-board, mostly due to worrying about heat. Would heat be that much of a concern in this case? And, if so, could I just use transistors to avoid that problem? I was thinking no since some heat will be transferred to the ground (and, if I have it, power) plane and it's still small levels of current. But wanted to make sure before I called my design good and ready for prototyping :) Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted September 26, 2011 Report Share Posted September 26, 2011 Hi, The SR's electrical parameters for the Dip16 and So16 cases are look very similar. Only a difference I found is in a Note1 at a page 8 from the attachment file. Regards, Janis74HC595.pdf Quote Link to comment Share on other sites More sharing options...
m00dawg Posted September 26, 2011 Author Report Share Posted September 26, 2011 I have a similar spec sheet (I think from TI) and yeah it's very similar. I noticed the range is -40 to 125C which I would obviously be within. Didn't know how that accounted for airflow but I'm guessing since I can't find it in the spec sheets that it's probably a non-issue. Quote Link to comment Share on other sites More sharing options...
ilmenator Posted September 26, 2011 Report Share Posted September 26, 2011 Apart from voltage regulators and SID chips I would not worry about any components in the MIDIbox world being overly sensitive to (lack of) heat dissipation. Placing shift registers between two layers of PCBs (that are about a cm or so apart in any case) should be no problem at all. Quote Link to comment Share on other sites More sharing options...
m00dawg Posted September 26, 2011 Author Report Share Posted September 26, 2011 Awesome! Thank you both for the advice! Quote Link to comment Share on other sites More sharing options...
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