A Dimensions: mm B Recommended land pattern: mm D Electrical Properties: Properties Test conditions Value Unit Tol. Inductance 100 kHz/ 10 mA L 3.9 H 20% Rated current T = 40 K I 2.8 A max. R Saturation current L/L < 10% I 2.6 A typ. sat DC Resistance 20C R 0.047 typ. DC DC Resistance 20C R 0.054 max. DC Self resonant frequency f 48 MHz typ. res C Schematic: E General information: It is recommended that the temperature of the part does not exceed 125C under worst case operating conditions. Ambient temperature: -40C to +85C (refering to I ) R Operating temperature: -40C to +125C Storage temperature (on tape & reel): -20C to +40C 75% RH max. Test conditions of Electrical Properties: 20C, 33% RH if not specified differently DESCRIPTION Reference on drawing Description Start of winding WE-PD2 SMD Power Inductor Marking 3R9 (Inductance Code) Wrth Elektronik eiSos GmbH & Co. KG EMC & Inductive Solutions 2.3 2014-06-23 SSt SSt Max-Eyth-Str. 1 2.2 2014-03-26 SSt SSt 74638 Waldenburg Order.- No. SIZE Germany 2.1 2013-04-18 SSt ALa Tel. +49 (0) 79 42 945 - 0 www.we-online.com 7447745039 A4 2.0 2009-05-19 ME - eiSos we-online.com REV DATE BY CHECKED Size: 5820 This electronic component has been designed and developed for usage in general electronic equipment only. This product is not authorized for use in equipment where a higher safety standard and reliability standard is especially required or where a failure of the product is reasonably expected to cause severe personal injury or death, unless the parties have executed an agreement specifically governing such use. Moreover Wrth Elektronik eiSos GmbH & Co KG products are neither designed nor intended for use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation (automotive control, train control, ship control), transportation signal, disaster prevention, medical, public information network etc.. Wrth Elektronik eiSos GmbH & Co KG must be informed about the intent of such usage before the design-in stage. In addition, sufficient reliability evaluation checks for safety must be performed on every electronic component which is used in electrical circuits that require high safety and reliability functions or performance.F1 Typical Inductance vs. Current Characteristics: DESCRIPTION WE-PD2 SMD Power Inductor Wrth Elektronik eiSos GmbH & Co. KG EMC & Inductive Solutions 2.3 2014-06-23 SSt SSt Max-Eyth-Str. 1 2.2 2014-03-26 SSt SSt 74638 Waldenburg Order.- No. SIZE Germany 2.1 2013-04-18 SSt ALa Tel. +49 (0) 79 42 945 - 0 www.we-online.com 7447745039 A4 2.0 2009-05-19 ME - eiSos we-online.com REV DATE BY CHECKED Size: 5820 This electronic component has been designed and developed for usage in general electronic equipment only. This product is not authorized for use in equipment where a higher safety standard and reliability standard is especially required or where a failure of the product is reasonably expected to cause severe personal injury or death, unless the parties have executed an agreement specifically governing such use. Moreover Wrth Elektronik eiSos GmbH & Co KG products are neither designed nor intended for use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation (automotive control, train control, ship control), transportation signal, disaster prevention, medical, public information network etc.. Wrth Elektronik eiSos GmbH & Co KG must be informed about the intent of such usage before the design-in stage. In addition, sufficient reliability evaluation checks for safety must be performed on every electronic component which is used in electrical circuits that require high safety and reliability functions or performance.