Document 420-1
VRM/ VRD Power Inductors – MVR
MVR1251T only
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 multi-phase
voltage regulators and are ideal for use in DC-DC con-
verters, 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.
L
2
DCR
SRF
3
Height
±20% ±8%
typ
Isat
4
Irms
5
max
(µH) (mOhm) (MHz) (A) (A) (mm)
0.25
0.36
0.56
0.36
0.65
1.10
1.65
2.30
0.925
0.925
0.925
0.925
1.50
1.95
2.53
3.08
160
140
110
120
115
95
55
50
35
24
13
36
24
20
17
16
25
24
25
24
19
20
20
17
5.1
5.1
5.1
4.7
5.5
6.1
7.1
7.8
Core material
MVRxxxT: Ferrite; MVRxxxxC: Powdered iron
Core and winding loss
See www.coilcraft.com/coreloss
Terminations
RoHS compliant tin-silver over copper. Other termina-
tions 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
Part number
1
Low core loss
MVR1251T-251ML_
MVR1251T-361ML_
MVR1251T-561ML_
Soft saturation
MVR1247C-361ML_
MVR1255C-651ML_
MVR1261C-112ML_
MVR1271C-162ML_
MVR1278C-232ML_
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.
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 with pure water or alcohol only. For other
solvents, see Doc787_PCB_Washing.pdf.
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 420-1
Revised 07/13/11
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 420-2
MVR Series – VRM/ VRD Power Inductors
Current Derating
120
110
Temperature Rise vs Current
80
Temperature rise (from 25°C)
Percent of rated current
100
90
80
70
60
50
40
20
10
0
Isat
Irms
-40
-20
0
20
30
MVRC
70
60
50
40
30
20
10
0
0
MVR12xxC
MVR12xxT
2.3 µH
0.65 µH
1.10 µH
1.65 µH 0.36 µH
0.25 µH
0.36 µH
0.56 µH
MVRT
25°C
40
60
80
100
120 140
5
10
15
20
25
30
35
Ambient temperature (°C)
Current (A rms)
L vs Current Comparison – 0.36 µH
0.5
Inductance (µH)
0.4
MVR1251T-361
MVR1247C-361
0.3
0.2
0.1
0.1
1
10
100
Current (A)
ESR vs Frequency Comparison – 0.36 µH
Equivalent Series Resistance (Ohms)
10
9
8
7
6
5
4
3
2
1
0
0.1
1
10
100
MVR1247C-361
MVR1251T-361
Dimensions are in
inches
mm
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
Body size
MVR1247
MVR1251
MVR1255
MVR1261
MVR1271
MVR1278
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
Frequency (MHz)
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 420-2
Revised 07/13/11
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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