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 RB521S30_1 ? NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 6 October 2009 4 of 12 NXP Semiconductors RB521S30 200 mA low VF MEGA Schottky barrier recti?er FR4 PCB, standard footprint Fig 1. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values FR4 PCB, mounting pad for cathode 1 cm2 Fig 2. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values 006aab710 tp (s) 1 10?3 102 103 10 1 10?2 10?1 102 10 103 Zth(j-a) (K/W) duty cycle = 1 0.75 0.5 0.33 0.25 0.2 0.1 0.05 0.02 0.01 0 006aab711 tp (s) 1 10?3 102 103 10 1 10?2 10?1 102 10 103 Zth(j-a) (K/W) duty cycle = 1 0.75 0.5 0.33 0.25 0.2 0.1 0.05 0.02 0.01 0 |