POWER SCHOTTKY RECTIFIERS 32A Pk, up to 45V FEATURES Very Low Forward Voltage (0.5V max @ 16A) e Reverse Transient Capability (3A, 250W) Economical Convenient Plastic Package @ Mechanically Rugged 45V Blocking Voltage @ Rated Timax ABSOLUTE MAXIMUM RATINGS USD920 Working Peak Reverse Voltage, Vawa ..-...cceeec cence eee e ete e ene eeenernen es DC Blocking Voltage, Va .......- cece cece eee tree eee Peak Repetitive Surge Voltage, Vs Average Rectified Forward Current @ Te = 115C, lo Peak Repetitive Forward Current (Rated Vr, Square Wave, 20KHz, 50% Duty Cycle, @ Tc = 115C), lram... Non-repetitive Peak Surge Current (8.3mS), lrsm Reverse Transient Capability Reverse Transient Current, Pk Reverse Transient Power, Pk... 0.0... cece cece nee e eee nee ees Peak Operating Junction Temperature, Timax Storage Temperature Range, Tstg .---.- eee cence eee tenet neee Thermal Resistance, Junction to Case, Rec ELECTRICAL CHARACTERISTICS (Tcase = 25C) USD920 USD935 USD940 USD945 DESCRIPTION The USD900 series of Schottky barrier power rectifiers is ideally suited for output rectifiers and catch diodes in low voltage power supplies. USD935 USD940 USDS45 CHARACTERISTIC SYMBOL LIMIT UNITS CONDITIONS Maximum Instantaneous in 20 mA Va = Vawm Reverse Current Pulse Width = 400uS Duty Cycle = 1 percent Typical instantaneous ia 50 mA Va = Vawe Reverse Current Pulse Width = 400.58 Duty Cycle = 1 percent Te = 125C Maximum Instantaneous ve 0.6 ip = 16A Forward Voltage 05 ip =16A Te = 125C Capacitance Cr 2000 pF Va = 5V Voltage Rate of Change dv/dt 1000 V/uS Va = Vawm MECHANICAL SPECIFICATIONS SEATING USD900 SERIES SIMILAR TO TO-220 PLANE a aan i i Oo ft = wo | ld { H Yio k ae T Lo nL. PIN 1. Cathode | 2. Anode Tab is connected to Cathode. 11/80 324 Ly aa UNITRODE Typical Forward Current vs. Forward Voltage NT (A) 0.1 0.0 01 02 03 04 05 06 07 08 09 10 Ve VOLTAGE (V) Output Current vs. Temperature 16 14 \ Infinite Heatsink with Vawm = rated +. Te reference) 12 < ~ 10 \ 2 a io a 3 8 E \ > a Ee 2 o 6 $ Free Air (T, reference} Va=0 | Vawm = Rated 4 4. i pw TX IN PN 0 ie} 25 50 75 100 125 150 TEMPERATURE (C) UNITRODE CORPORATION + 5 FORBES ROAD LEXINGTON, MA 02173 TEL. (617) 861-6540 TWX (710) 326-6509 TELEX 95-1064 325 USDS20 USD935 USDS40 USD945 Typical Reverse Current vs. Voltage 2 E &b Zz a co & D> Oo ad nn ao wi > ive) a L 0 10 20 30 40 50 60 70 80 90 100 110120130 % of Va CY) V, Rating vs. Temperature 100% ve Wry [Yom o A A Zz E \ \ \ cot g \ \ = aa Si \ uw \ & 5 50% Vt Sos .= we i \ = ee S \\ a oO ~ i a -60 -25. 0 25 50 75 100 125 160 175 TEMPERATURE (C} PRINTEO IN U.S.A.