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MRF39RA Datasheet, PDF (67/72 Pages) Microchip Technology – Low-Power, Integrated UHF Receiver
8.3 Thermal Impedance
The thermal impedance of this package is:
Theta ja = 23.8°C/W typ., calculated from a package in
still air, on a 4-layer FR4 PCB as per the JEDEC®
standard.
MRF39RA
 2015 Microchip Technology Inc.
DS40001778B-page 67