Document 420-1 VRM/ VRD Power Inductors – MVR The MVR series provides greater current handling capability than any other power inductor its size. While requiring only one square centimeter of board space, this inductor can handle up to 36 Amps of current. These shielded inductors were developed for multiphase voltage regulators and are ideal for use in DCDC converters, battery-powered devices and high current power supplies. Their flat wire construction ensures very low DC resistance and offers an excellent performance-to-height ratio. The materials used in these parts eliminate all thermal aging issues. The MVR12xxT is a high efficiency part that features very low core loss. The MVR12xxC provides soft saturation and is unaffected by part temperature up to 125°C. Refer to the comparison curves for L vs Current and ESR vs Frequency for performance differences. For free evaluation samples, contact Coilcraft or order them online at www.coilcraft.com. Part number1 Low core loss MVR1251T-251ML_ MVR1251T-361ML_ MVR1251T-561ML_ Soft saturation MVR1247C-361ML_ MVR1255C-651ML_ MVR1261C-112ML_ MVR1271C-162ML_ MVR1278C-232ML_ L2 DCR SRF3 Height ±20% ±8% typ Isat4 Irms5 max (µH) (mOhm) (MHz) (A) (A) (mm) 0.25 0.36 0.56 0.925 0.925 0.925 160 140 110 35 24 13 25 24 25 5.1 5.1 5.1 0.36 0.65 1.10 1.65 2.30 0.925 1.50 1.95 2.53 3.08 120 115 95 55 50 36 24 20 17 16 24 19 20 20 17 4.7 5.5 6.1 7.1 7.8 1. When ordering, please specify termination and packaging codes: MVR1278C-232MLC Termination: L = RoHS compliant tin-silver over copper. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Packaging: C = 7″ machine-ready reel. EIA-481 embossed plastic tape. B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter C instead. D = 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked. 2. Inductance measured at 500 kHz, 0.1 Vrms, 0 Adc using a Coilcraft SMD-A fixture in an Agilent/HP 4284A LCR meter or equivalent. 3. SRF measured on an Agilent/HP 8753ES. 4. DC current at which the inductance drops 30% (typ) for MVR12xxC and 20% (typ) for MVR12xxT from its value without current. 5. Current that causes a 40°C temperature rise from 25°C ambient. 6. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Core material MVRxxxT: Ferrite; MVRxxxxC: Powdered iron Core and winding loss See www.coilcraft.com/coreloss Terminations RoHS compliant tin-silver over copper. Other terminations available at additional cost. Weight MVRT: 2.1 g; MVRC: 2.45 – 3.86 g Ambient temperature –40°C to +85°C with Irms current, +85°C to +125°C with derated current Storage temperature Component: –40°C to +125°C. Packaging: –40°C to +80°C Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging MVR1247 MVR1251 MVR1255 MVR1261 MVR1271 MVR1278 200/7″ reel; 900/13″ reel 175/7″ reel; 700/13″ reel 175/7″ reel; 700/13″ reel 175/7″ reel; 700/13″ reel 100/7″ reel; 500/13″ reel 100/7″ reel; 500/13″ reel Plastic tape: 24 mm wide, 16 mm pocket spacing MVR1247 0.35 mm thick, 4.5 mm pocket depth MVR1251 0.4 mm thick, 6.1 mm pocket depth MVR1255 0.4 mm thick, 6.1 mm pocket depth MVR1261 0.4 mm thick, 6.1 mm pocket depth MVR1271 0.4 mm thick, 7.5 mm pocket depth MVR1278 0.4 mm thick, 7.5 mm pocket depth PCB washing Only pure water or alcohol recommended Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 Document 420-1 Revised 10/20/08 Document 420-2 MVR Series – VRM/VRD Power Inductor Current Derating Temperature Rise vs Current 100 90 80 70 MVRT 60 50 40 30 Isat Irms -40 -20 0.65 µH 1.10 µH 1.65 µH 0.36 µH 60 2.3 µH 40 30 20 10 0 0 20 40 60 80 100 120 140 0 5 10 15 Ambient temperature (°C) 20 Dash number XXXX T-XXX 0.5 Inductance (µH) 25 30 35 Current (A rms) L vs Current Comparison – 0.36 μH 0.4 0.25 µH 0.36 µH 0.56 µH 50 Length (see table) MVRC or MVRT MVR1251T-361 0.369 typ 9,38 0.384 max 9,75 MVR1247C-361 0.3 XXXX 10 0 MVR12xxC MVR12xxT 70 C - XXX 20 Temperature rise (from 25°C) 80 MVRC 25°C Percent of rated current 120 110 Internal code Part Marking Height (see table) 0.2 0.1 0.1 10 1 100 Recommended Land Pattern Start Finish 0.223 ±0.012 5,67 ±0,30 0.351 8,91 0.069 ±0.002 1,75 ±0,05 Current (A) 0.336 ±0.010 8,53 ±0,25 Equivalent Series Resistance (Ohms) ESR vs Frequency Comparison – 0.36 μH 0.375 9,53 10 9 8 Dimensions are in 0.100 2,54 inches mm 7 6 MVR1247C-361 MVR1251T-361 Body size MVR1247 MVR1251 MVR1255 MVR1261 MVR1271 MVR1278 5 4 3 2 Height (in. / mm) typ max 0.171 / 4,35 0.185 / 4,70 0.181 / 4,61 0.200 / 5,10 0.207 / 5,25 0.217 / 5,50 0.232 / 5,90 0.240 / 6,10 0.262 / 6,65 0.280 / 7,10 0.287 / 7,29 0.307 / 7,80 Length(in. / mm) typ max 0.448 / 11,37 0.453 / 11,50 0.439 / 11,14 0.453 / 11,50 0.448 / 11,37 0.453 / 11,50 0.448 / 11,37 0.453 / 11,50 0.448 / 11,37 0.453 / 11,50 0.448 / 11,37 0.453 / 11,50 1 0 0.1 1 10 100 Frequency (MHz) Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 Document 420-2 Revised 10/20/08 Document 420-3 MVR Series – VRM/VRD Power Inductor MVR12xxC L vs Frequency L vs Frequency 3.0 3.0 2.5 2.5 Inductance (µH) Inductance (µH) MVR12xxT 2.0 1.5 1.0 0.56 µH 0.5 0.1 10 1 2.30 µH 1.5 1.65 µH 1.0 1.10 µH 0.65 µH 0.36 µH 0.5 0.36 µH 0.25 µH 0 2.0 0 0.1 100 100 L vs Current 3.0 3.0 2.5 2.5 Inductance (µH) Inductance (µH) L vs Current 2.0 1.5 1.0 0.56 µH 0.36 µH 0.25 µH 0.5 0 0.1 10 1 Frequency (MHz) Frequency (MHz) 10 1 2.0 2.30 µH 1.5 1.65 µH 1.0 1.10 µH 0.5 0.65 µH 0.36 µH 0 100 0.1 10 1 Current (A) 100 Current (A) Inductance vs current is unaffected by part temperature up to 125°C. ESR vs Frequency 10 9 0.56 µH 8 0.36 µH 7 6 5 0.25 µH 4 3 2 1 0 0.1 1 10 100 Equivalent Series Resistance (Ohms) Equivalent Series Resistance (Ohms) ESR vs Frequency 10 9 2.30 µH 8 1.65 µH 7 0.36 µH 1.10 µH 6 0.65 µH 5 4 3 2 1 0 0.1 Frequency (MHz) 10 100 Frequency (MHz) Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 1 Document 420-3 Revised 10/20/08