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The AD8065/AD80661 FastFETâ„¢ amplifiers are voltage feedback amplifiers with FET inputs offering high performance and ease of use. The AD8065 is a single...
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AD8065 on Analog.com

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AD8065 SOT23 Thermal Resistance (Junction to Case)

		
	
				

			

									
					    crdufour
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Mar 21, 2024 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user sought the junction-to-case thermal resistance (θJC) for the AD8065WARTZ amplifier. The final answer provided the θJC for the AD8065 in SOT23 package as 57.76 °C/W. The thread also referenced the AD8066ARMZ, which has a θJC of 58 °C/W.
                        	    

                
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Category: Datasheet/Specs

    		        		            		    
Product Number:  AD8065  

    		        		    		    

		    		    
		    			

			    
Looking for clarification on the package thermal resistance for AD8065 amplifiers. I am specifically interested in the AD8065WARTZ junction-to-case resistance, but any similar information would be helpful such as the junction-to-ambient.


The datasheet (https://www.analog.com/media/en/technical-documentation/data-sheets/AD8065_8066.pdf) lists power derating values, which are plotted in figure 3 (page 9, ABSOLUTE MAXIMUM RATINGS). These are labeled as the junction-to-ambient resistance for the three packages. 


"Figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the SOIC (125°C/W), SOT-23 (180°C/W), and MSOP (150°C/W) packages on a JEDEC standard 4-layer board. θJA values are approximations."


Then on page 22 (THERMAL CONSIDERATIONS), another thermal resistance value is used. 


"...especially in the small SOT-23-5 (thermal resistance of 160°C/W)."


I saw that the thermal resistance (θJC) of AD8066ARMZ is 58 °C/W, so I was hoping that the AD8065 parts had this data available too. 


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