• State Verified Answer
  • Replies 1 reply
  • Subscribers 39 subscribers
  • Views 1414 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
LT1529-5 Thermal Resistance



		

			

									
					    lux
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 5, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    
 
    I  have  a couple of questions on the　LT1529-5 thermal resistance.  
    
 
    Q1: In the datasheet package information section, we  find the theta J-A = 30 degrees/W 　for Q package.
    
 
    What is the conditions under which the measurements were taken to determine this ?
    
 
    Was the tab on the package contacted or soldered to a copper layer with some area, or was the package made stood in the still air with no connection to any external metal layer?
    
 
    Q2:　This may not be very meaningful, but please let me ask.
    
 
    Is a resistance value for thermal resistance from the junction to the  on the package、assuming
    
 
    the tab has  no connection to any external metal layer?
    
 
    Best Regards,
    
 
    Lux
    
									
			        
		
    

				
						
        

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 12, 2018 6:35 PM
            
            
					
      
	
      

		
		
      
					
      Thanks for the post.
      
 
      Table 1 in the Thermal Considerations section of the datasheet has useful thermal resistance values and gives  the conditions used to derive the thermal resistances. Table 1 and the applicable text are shown in the image below:
      
 
      
 
      The thermal resistances referred to in the original post from the PACKAGE/ORDER INFORMATION section of the datasheet are accurate according to conventions - probably JEDEC - but the Table 1 thermal resistances mentioned above usually help customers predict device temperatures more easily.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	
    



Reply

      


    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jul 12, 2018 6:35 PM
            
            
					
      
	
      

		
		
      
					
      Thanks for the post.
      
 
      Table 1 in the Thermal Considerations section of the datasheet has useful thermal resistance values and gives  the conditions used to derive the thermal resistances. Table 1 and the applicable text are shown in the image below:
      
 
      
 
      The thermal resistances referred to in the original post from the PACKAGE/ORDER INFORMATION section of the datasheet are accurate according to conventions - probably JEDEC - but the Table 1 thermal resistances mentioned above usually help customers predict device temperatures more easily.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


Children
	
    No Data