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LT3045 Recommended for New Designs
The LT3045 is a high performance low dropout linear regulator featuring LTC’s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive...
Datasheet
LT3045 on Analog.com

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LT3045 Thermal

		
	
				

			

									
					    Klex Lin
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 24, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  LT3045 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Dear ADI Support Team,
    

    I’m using the LT3045 in a new design and I’m preparing a thermal simulation model. I noticed the datasheet lists θJA and θJC, but I couldn’t find θJB (Junction-to-Board).
    

    Could you please provide the LT3045 θJB value ? or any recommended thermal model/approach for estimating Tj from board temperature?
    

    For reference, I’m primarily interested in the package(s) below:
    

      

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      [DD] 3mm × 3mm DFN (preferred)
      

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      [MSE] MSOP-12 (if different)
      

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    Thank you in advance for your help.
    

    Best regards,
    Klex
    
			
    
			
									
		                             
                        

    
    
                                            
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Dec 24, 2025 5:49 AM
            
            
						
			            		
      
		
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      ADI North America will be on winter shutdown starting December 24, 2024; perhaps another community member can assist you until our return on January 2, 2025.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
				
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 2, 2026 3:42 AM
            
            
						
			            		
      
		
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      Hi,
      

      

      

      Thanks for contacting Analog Devices!
      

      

      

      We provide info of Junction to ambient and junction to case thermal resistance only. Junction to board Thermal resistance is different for different boards. So, this info is not mentioned in datasheet.
      

      

      

      Generalised thermal data for LT/AD parts.
      

      Sometime Junction to board Thermal resistance is not mentioned in datasheet. So, Please use thermal resistance table for ADI and LTC parts shown below.
      

      

       
      

      

      

      We provide soldering temp info for some IC's.
      

      All ADI IC follows JEDEC standard.  If soldering temp info is not available in datasheet, then Please follow JEDEC.org for more detail.
      

      

      

      ADI only provides LTspice model. You can do thermal calculation for max junction temperature calculation.
      

       
      

      

      Regards,
      

      Tech Support
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
				
				
				
		
		
      
			
		
      
	
      

      

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