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HMC546MS8G Production
The HMC546MS8G(E) is a low-cost SPDT switch in 8-lead MSOP8G surface mount package for use in transmit-receive applications which require very low distortion...
Datasheet
HMC546MS8G on Analog.com

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HMC546MS8G pin 6(Vdd) is short to the exposed pad(GND)？



		

			

									
					    Kevin J
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 28, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello, everyone！
    

    Today, I test the chip HMC546MS8G itself, I found pin 6 (Vdd) is short to the exposed pad(GND) and the resistor to GND is about 0.2Ω， is it normal? if so, when powered, the current of vdd will be very large? I think it is very strange. When the chip is installed on the PCB, the suitation is the same. Is there anything wrong with this chip?
    

    Thanks!
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 hmc546ms8g
                
                                                    
                 RF Switches
                
                                                    
                 SPDT T/R
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 28, 2021 12:58 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      

      I do not think Vdd should be short to ground. On page 11 of datasheet, in the Pin Descriptions table, Vdd is connected with a resistor and a cap to the ground. You should measure a very large resistance or open circuit.
      

      Could you measure vctl (pin 3) as well?
      

      How many HMC546MS8G do you have? Do they all have Vdd short to ground?
      

      Please make sure that there will be no risk of ESD before you open a new part.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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                on Feb 4, 2021 1:56 AM
            
            
												
						in reply to zwang
					
									
        
	
        

		
		
        
					
        Thanks! I can't agree with you any more, I think Vdd is not supposed to be connected with GND as well. I test the vctl as well, it is not connected to GND. I have several pieces of HMC546MS8G(H546 1147), they all have Vdd short to GND, this batch(H546 1147) has some problems I think. Later, I test other batches of HMC546MS8G, they are normal!
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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