Rev. B/CZ MJD3055 SMD Power Transistor (NPN) Page 2 of 4 Thermal Characteristics Symbol Description MJD3055 Unit RthJC Thermal Resistance from Junction to Case 6.25 °C/W *RthJA Thermal Resistance from Junction to Ambient 71.4 °C/W Note: *These ratings are applicable when surface mounted on the minimum pad sizes recommended.