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LTspice® is a powerful, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the simulation...
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ADG2412 Recommended for New Designs
The ADG2412 contains four independent single-pole/single-throw (SPST) switches. The ADG2412 switches turn on with logic 1 on the digital control inputs...
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ADG2412 on Analog.com

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					    Roey
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Mar 23, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is experiencing unexpected overvoltage behavior with the ADG2412 analog switch in LTspice simulations, where current flows to GND instead of VDD or VEE. The support engineer confirmed this is a model issue and plans to update the model. The user requires a low Ron, flatness, and high bandwidth for an NTSC analog video application, and is looking for an alternative model to check the ESD diodes.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  ADG2412  

    		        		    		    

		    		    
		    			

			    
Hi Team


I want to use the ADG2412 in my new design


The switch is used for analog video NTSC. The switch is the first component from the Coax cable.


There might be a case that my unit is powered off and there is still active video from the video source.


I want to protect the analog switch with external shottcky diodes.


I tried to simulate it with the LTSPICE but is seems that in over voltage case the current flows to the GND instead of the VDD or VEE




 


 


Is this a normal behavior? Is it a mistake in simulation model?


I attached the LTspice simulation.


Thanks


Roey




ADG2412_ANALOG_SWITCH.asc

			

			
									
		                             
                        

    

                                            
                 ADG2412
                
                                                    
                 hardware
                
                                                    
                 switches and multiplexers
                
                                                    
                 Analog Switches & Multiplexers
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Mar 23, 2026 10:08 PM
            
            
						
			            		
    
		
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    Hi  ,
    

    

    

    

    I tested this part on my side and observed the same unexpected behavior. Based on my analysis, this appears to be a model issue, and we plan to update the model accordingly. Please note that this part was released several years ago and was not fully optimized, which may explain some of the observed behavior.
    

    As a side note, we will be updating this model to align with our newer modeling standards. The updated model will include all channels and will specify the supply only in the first specification table, defined as a ±15 V dual supply with ±10% tolerance. If you require support for a specific supply condition, such as a ±5 V dual supply, please submit a request via email at angelo.floralde@analog.com.
    

    

    

    

    Regards,
    

    Gelo
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Mar 24, 2026 11:18 AM
            
            
						
			            		
    
		
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    Hi Roey,
    

    In addition to Gelo's response about the modeling, I would just add that it might be worth taking a look at the ADG5412F. This is a similar switch with integrated overvoltage protection.
    

    

    Regards,
    

    David
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Mar 25, 2026 3:05 AM
            
            
						
			            		
    
		
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    Hi David
    

    Thanks for the advice the ADG5412F has 10ohm Ron which is too high.
    

    I wanted the low Ron of ADG2412, Ron flatness and High BW (sufficient for my analog video application)
    

    

    When will the ADG2412 LTspice model updated?
    

    Can you suggest an alternative model for checking the ESD diodes?
    

    

    Regards,
    

    Roey
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Apr 24, 2026 1:16 AM
            
            
												
						in reply to Roey
					
										
			            		
    
		
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    Hi Roey,
    

    Apologies for the delay in replying. The ADG2412 update has already been released to LTspice.
    

    Regards,
    

    Gelo
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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