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LTSpice v26.0.1 convergence / stability issues after upgrading from v26.0.0

		
	
				

			

									
					    2Torr
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 9, 2026 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Software
    
    		        		        		        		        
    Software Version: LTspice v26.0.1
    
    		    		    
    
		    		    
		    			
    
			    
    Hi,
    

    I've been experiencing convergence and stability issues in LTspice v26.0.1 with multiple different circuits than simulated without issues in v26.0.0 and earlier.
    

    So much so, that I've decided to roll back to v26.0.0 until the issues can be resolved.
    

    It's definitely related to an update of the program, not the included SPICE models, as I'm able to simulate the circuits fine in v26.0.0 and earlier with the latest models.
    

    I've noticed that others have reported multiple issues with v26.0.1 as well.
    

    Would you please look into the stability and convergence issues, perhaps by running some golden example circuits, and release a fixed version ASAP?
    

    Thanks!
    
			
    
			
									
		                             
                        

    
    
                                            
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                 26.0.1
                
                                                    
                 LTspice
                
                                                    
                 LTspice v26.0.1
                
                                                    
                 26.0.0
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 12, 2026 3:13 AM
            
            
						
			            		
      
		
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      Dear  ,
      

      Every LTspice release is extensively tested. 26.0.1 is by far the most robust version ever.
      

      It is a common misconception that something is "wrong" with a new release simply because some random circuit "worked" in previous releases. Many LTspice models use non-physical idealized components to speed up the simulation, but unfortunately it is very easy to construct ill-formed circuits this way. Improvements in LTspice often expose these flaws, which is why models suddenly fail in a new release. We've seen this a hundret times. This is a very complex matter.
      

      I'm afraid we can't be of much help without a test case that demonstrates the problem. However, I strongly advice against using 26.0.0 for reasons that are beyond the scope of this post.
      

      Best Regards,
      Mathias
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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