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  MUR550APFG, MURD550PFG, MUR550PFG, MURF550PFG, NRVUD550PFT4G http://onsemi.com 3 Lead Length, L (IN) Mounting Method 1/8 1/4 1/2 Units3/4 1 2 3 50 58 RJA 51 53 59 61 28 ?C/W ?C/W ?C/W TYPICAL VALUES FOR RJA IN STILL AIR Data shown for thermal resistance junction?to?ambient (RJA) for the mountings shown is to be used as typical guideline values for preliminary engineering or in case the tie point temperature cannot be measured. NOTE 2 — AMBIENT MOUNTING DATA MOUNTING METHOD 1 MOUNTING METHOD 2 MOUNTING METHOD 3 55 63 L L P.C. Board Where Available Copper Surface area is small. L L Vector Push?In Terminals T?28 L = 1/2? Board Ground Plane P.C. Board with ? x1?1/2? Copper Surface 1?1/2 |