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LT3033 Thermal Resistance

Category: Datasheet/Specs
Product Number: LT3033

Hi 

I refer to www.analog.com/.../LT3033.pdf

On page 18, under Applications Information, it states 'The underside of the LT3033 UDC package has exposed metal from the lead frame to the die attachment.' Could I check if this is referring to Pins 21, 22, 23 and 24? 

If so, could I confirm that the Theta_JC value of 3.4degC/W is referring to the thermal resistance between junciton-to-case (bottom)? The value seems quite small for the footprint of Pins 21 - 24. 

Thank you