Hi
I am using OPT3007 component in one of my design. I saw mounting mechanism in datasheet and it is referring FPCB.
Does FPCB reflect flex PCB only? We can't use on FR4 Rigid PCB of thickness 0.8mm with proper cut out on optical area side?
Please confirm on this.
Hi Sumit,
What is the reason for using OPT3007 in this application? This device is very small so is usually used on flex PCB in very size constrained applications. Whereas OPT3004 is used for non size constrained applications. OPT3007 can be mounted to a rigid PCB but the impact of the thickness of the rigid PCB needs to be considered. You can use the OPT3006 field of view estimator tool available for download on the OPT3006 page under tools and software to check this.
Here is a quick comparison I did to give an idea between a 127um thickness FPCB vs your 800um rigid with hole size fixed at 400um. If you can make hole bigger this will recover some performance, but you can see the increased thickness can have quite a big impact on angular performance and decreasing half angle.
127um thickness
800um
Best,
Alex
Hi Alex,
I can understand. Thanks for sharing this calculations.
Due to size constraint only planned to use this package. I am also making wearable device but area where this part will be mounted that is 0.8mm Rigid PCB. OPT3004 is of 2mmX2mm package which is bigger.
You mentioned that we can increase performance by increasing hole size. Which hole size are you referring? You are referring to PCB cut out (Opening window) for optical area or something else?
Refer below image in which i have shown PCB cut out opening.
