As for NC pins of HMC519LC4

Question

Hello, 
 I have a question about NC pins of HMC519LC4. How ahould we do for NC pins? open? or connect to GND? Which is better? 
 Best regards, 
 Akira

SMcBride · Accepted Answer

Hi Akira, 
 The Pin Descriptions tables on HMC data sheets sometimes indicate how the NC pins were treated during our collection of data for the data sheets. In this case, however, the data sheet does not. In my opinion it's usually better to ground NC pins unless instructed to do otherwise. A good point of reference would be our EVB, which grounds all of the NC pins as shown below. For that reason I recommend that you ground all of the NC pins. 
 Regards, 
 SMcBride)

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As for NC pins of HMC519LC4