Author Topic: Searching for means to ensure positive SMD pad-to-pad contact  (Read 2035 times)

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Offline rbmTopic starter

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Searching for means to ensure positive SMD pad-to-pad contact
« on: October 09, 2017, 02:27:02 am »
hi,

I'm designing a replacement display module for an existing design and need input on the best means to ensure positive contact between SMD pads on the main card and SMD pads on the display module.  The original manufactured module contains an LCD display inside a polycarbonate enclosure which is mechanically screwed to the mainboard.  There are flexible pressure contacts on the LCD which mate with SMD pads on the mainboard. The act of screwing down the display module ensure positive electrical contact with the SMD pads.

Below is a picture of the original display module and main card.  The display module is the polycarbonate unit on the right.  Under this module are 8 SMD pads that contact the LCD display.


I'm designing a replacement display module with the same mechanical fixture, but I am searching for a means to ensure the positive electrical contact.  This might be achieved with a sprung brellium copper terminal or a pogo pin, but I have to keep the height of the display at a minimum.  I plan on designing a PCB that will directly contact the main card and have pads that precisely align with the pads on the main card.  I know that I have to build up the height of the pad on the display module so that the act of screwing down the module will guarantee positive contact.

What is the best means to raise the height of the SMD pad?  I've searched through Digikey and found this part:
https://www.digikey.ca/product-detail/en/harwin-inc/S70-220102045R/952-3142-6-ND/6211263

Will this part work? 
« Last Edit: October 09, 2017, 02:29:48 am by rbm »
- Robert
 


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