WEITRON WSD490/WSD491 Surface Mount Schottky Barrier Diode P b Lead(Pb)-Free Features: * Low current rectification and high speed switching. * Small surface mount type. * Up to 500mA current capability. * Low forward voltage drop . * Silicon epitaxial planar chip, metal silicon junction. * Lead-free parts meet environmental standards of MIL-STD-19500 /228 SCHOTTKY BARRIER RECTIFIERS 1.0AMPERES 25-45VOLTS 3 1 2 Mechanical Data: * Epoxy:UL94-V0 rated flame retardant * Case : Molded plastic, SOT-23 * Terminals : Solder plated, solderable per MIL-STD-750, Method 2026 * Mounting Position : Any * Weight : Approximated 0.008 gram SOT-23 SOT-23 Outline Dimensions Unit:mm A B TOP VIEW E G C D H K J WEITRON http://www.weitron.com.tw L M 1/3 Dim A B C D E G H J K L M Min 0.37 1.20 2.10 0.89 0.46 1.78 2.80 0.01 0.89 0.35 0.09 Max 0.50 1.40 2.64 1.09 1.00 2.04 3.04 0.13 1.11 0.69 0.18 Rev.A 11-Jan-2011 WSD490/WSD491 Maximum Ratings and Electrical Characteristics Rating 25 C Ambient Temperature Unless Otherwise Specified. Single Phase Half Wave, 60Hz , Resistive or Inductive Load. For Capacitive Load, Derate Current by 20%. Type Number Symbol WSD490 WSD491 Unit VRM 45 25 V Continuous reverse voltage VR 45 25 Mean rectifying current Io 1.0 V A Forward surge current, 8.3 ms Single Half Sine-Wave Superimposed on Rated Load (JEDEC Method) IFSM 3.0 A Maximum Instantaneous Forward Voltage at 1.0A VF Maximum Recurrent Peak Reverse Voltage Maximum DC Reverse Current Ta=25 C 0.50 IR At Rated DC Blocking Voltage Ta=100 C Operating Temperature Range Storage Temperature Range 0.45 V 0.2 mA 4.0 Tj -50 to + 125 mA C TSTG -50 to + 125 C Device Marking Item Marking WSD491 10T WSD490 10F WEITRON http://www.weitron.com.tw Eqivalent Circuit diagram 3 CATHODE 3 CATHODE 2/3 1 ANODE 1 ANODE Rev.A 11-Jan-2011 AVERAGE FORWARD CURRENT(A) WSD490/WSD491 10 3.0 W 49 0D W 49 1D INSTANTANEOUS FORWARE CURRENT(A) 50 1.0 TJ=25 C 1.2 1.0 0.8 0.6 Single Phase Half Wave 60Hz Resistive Or Inductive Load 0.4 0.2 0 0 Pulse Width 300us 1% Duty Cycle 20 40 60 80 100 120 140 160 180 200 AMBIENT TEMPERATURE ( C) FIG.2 Typical Forward Current Derating Curve 0.1 .01 .1 .2 .3 .4 .5 .6 .7 .8 175 FIG.1 Typcial Forward Characteristics 150 REVERSE LEAKAGE CURRENT (mA) 100 10 JUNCTION CAPACITANCE (pF) FORWARE VOLTAGE.(V) 125 100 75 50 25 0 .01 .05 .1 .5 1 5 10 50 100 REVERSE VOLTAGE (V) 1.0 FIG .4 Typical Junction Capacitance Tj=75 C Tj=25 C .1 .01 0 20 40 60 80 100 120 140 PERCENTAGE RATED PEAK REVERSE VOLTAGE FIG.3 Typical Reverse Characteristics WEITRON http://www.weitron.com.tw 3/3 Rev.A 11-Jan-2011