MVR

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.
MVR1251T only
These shielded inductors were developed for multi-phase
voltage regulators and are ideal for use in DC-DC converters, battery-powered devices and high current power
supplies. Their flat wire construction ensures very low
DC resistance and offers an excellent performance-toheight 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.
L2DCR SRF3 Height
±20%±8%
typ Isat4 Irms5 max
Part number1
(µH)(mOhm)(MHz) (A) (A) (mm)
Low core loss
MVR1251T-251ML_0.25
MVR1251T-361ML_0.36
MVR1251T-561ML_0.56
Soft saturation
MVR1247C-361ML_0.36
MVR1255C-651ML_0.65
MVR1261C-112ML_1.10
MVR1271C-162ML_1.65
MVR1278C-232ML_2.30
0.925 160 35 25
0.925 140 24 24
0.925 110 13 25
5.1
5.1
5.1
0.925 120
1.50 115
1.95
95
2.53
55
3.08
50
4.7
5.5
6.1
7.1
7.8
36
24
20
17
16
24
19
20
20
17
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.
Tape and reel 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 Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
Document 420-1 Revised 07/13/11
Document 420-2
MVR Series – VRM/ VRD Power Inductors
Current Derating
Temperature Rise vs Current
100
90
80
70
MVRT
60
50
40
30
20
10
0
Isat
Irms
-40
-20
0
20
40
60
80
100
120 140
Temperature rise (from 25°C)
80
MVRC
25°C
Percent of rated current
120
110
MVR12xxC
MVR12xxT
70
0.65 µH
1.10 µH
1.65 µH 0.36 µH
60
2.3 µH
0.25 µH
0.36 µH
0.56 µH
50
40
30
20
10
0
0
5
10
Ambient temperature (°C)
15
20
25
30
35
Current (A rms)
L vs Current Comparison – 0.36 µH
Inductance (µH)
0.5
0.4
MVR1251T-361
MVR1247C-361
0.3
0.2
0.1
0.1
10
1
100
Current (A)
Equivalent Series Resistance (Ohms)
ESR vs Frequency Comparison – 0.36 µH
10
9
8
Dimensions are in
7
6
MVR1247C-361
5
MVR1251T-361
4
3
2
1
0
0.1
1
10
inches
mm
Height (in. / mm)Length (in. / mm)
Body size
typ
max
typ
max
MVR1247
0.171 / 4,35 0.185 / 4,70
0.448 / 11,37 0.453 / 11,50
MVR1251
0.181 / 4,61 0.200 / 5,10
0.439 / 11,14 0.453 / 11,50
MVR1255
0.207 / 5,25 0.217 / 5,50
0.448 / 11,37 0.453 / 11,50
MVR1261
0.232 / 5,90 0.240 / 6,10
0.448 / 11,37 0.453 / 11,50
MVR1271
0.262 / 6,65 0.280 / 7,10
0.448 / 11,37 0.453 / 11,50
MVR1278
0.287 / 7,29 0.307 / 7,80
0.448 / 11,37 0.453 / 11,50
100
Frequency (MHz)
Document 420-2 Revised 07/13/11
Document 420-3
MVR Series – VRM/ VRD Power Inductors
MVR12xxTMVR12xxC
L vs Frequency
3.0
3.0
2.5
2.5
Inductance (µH)
Inductance (µH)
MVR1251T only
L vs Frequency
2.0
1.5
1.0
0
0.36 µH
0.25 µH
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
0.56 µH
0.5
2.0
0
100
0.1
3.0
3.0
2.5
2.5
2.0
1.5
1.0
0.56 µH
0.36 µH
0.25 µH
0.5
0
0.1
100
L vs Current
Inductance (µH)
Inductance (µH)
L vs Current
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
100
0.65 µH
0.36 µH
0.1
10
1
Current (A)
100
Current (A)
ESR vs Frequency
ESR vs Frequency
Equivalent Series Resistance (Ohms)
Equivalent Series Resistance (Ohms)
Inductance vs current is unaffected by part temperature up to 125°C.
10
9
0.56 µH
8
0.36 µH
7
6
5
0.25 µH
4
3
2
1
0
0.1
1
10
Frequency (MHz)
100
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
1
10
100
Frequency (MHz)
Document 420-3 Revised 07/13/11