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DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Description
RoHS
2002/95/EC
• 165°C maximum total temperature operation
• Five sizes of Automotive grade shielded drum core
inductors
• Inductance range from 0.28uH to 1000uH
• Current range up to 56 Amps
• Mechanical secure mounting for high shock and vibration
environments
• Good thermal dispersion with thermal conductive epoxy
• Customized dual winding versions available upon request
for SEPIC or Flyback configurations
Applications
• Automotive Electronics (under the hood, interior/exterior)
• Telematics
• DC-DC converters
• Buck, boost, forward, and resonant converters
• Noise filtering and filter chokes
Environmental Data
• Storage temperature range: -40°C to +165°C
• Operating temperature range: -40°C to +165°C
(range is application specific)
• Solder reflow temperature: +260°C max. for
10 seconds max.
• Complies with AEC-Q200 standard
Part Number
DRA73-R33-R
DRA73-1R0-R
DRA73-1R5-R
DRA73-2R2-R
DRA73-3R3-R
DRA73-4R7-R
DRA73-6R8-R
DRA73-8R2-R
DRA73-100-R
DRA73-150-R
DRA73-220-R
DRA73-330-R
DRA73-470-R
DRA73-680-R
DRA73-820-R
DRA73-101-R
DRA73-151-R
DRA73-221-R
DRA73-331-R
DRA73-471-R
DRA73-681-R
DRA73-821-R
DRA73-102-R
Rated
Inductance
0.33
1.00
1.50
2.20
3.30
4.70
6.80
8.20
10.0
15.0
22.0
33.0
47.0
68.0
82.0
100
150
220
330
470
680
820
1000
OCL (1)
µH
+/-20%
0.29
0.91
1.36
2.52
3.18
4.86
6.63
8.06
10.27
14.98
22.39
31.84
47.83
66.89
83.77
101.7
151.1
218.8
326.4
472.6
682.9
825.3
991.9
Packaging
• Supplied in tape and reel packaging, 1350 (DRA73),
1100 (DRA74), 750 (DRA124), 600 (DRA125),
and 350 (DRA127) per reel
Irms (2)
Amperes
Isat (3)
Amperes
Isat (4)
Amperes
8.42
6.50
5.39
4.18
3.59
2.92
2.62
2.30
2.11
1.74
1.42
1.25
1.02
0.845
0.731
0.682
0.551
0.479
0.391
0.326
0.270
0.252
0.235
14.80
8.22
6.73
4.93
4.35
3.52
2.96
2.74
2.39
2.00
1.64
1.35
1.10
0.937
0.851
0.763
0.632
0.510
0.423
0.354
0.297
0.267
0.239
11.84
6.58
5.38
3.95
3.48
2.82
2.37
2.19
1.91
1.60
1.32
1.08
0.884
0.749
0.680
0.610
0.506
0.408
0.338
0.283
0.238
0.214
0.192
(1) Open Circuit Inductance test parameters: 100kHz, 0.25V, 0.0Adc,
tolerance is ±20%
(2) Irms: DC current for an approximate ∆T of 40°C without core loss. Derating is
necessary for AC currents. PCB layout, trace thickness and width, air-flow, and
proximity of other heat generating components will affect the temperature rise. It
is recommended that the temperature of the part not exceed 165°C under worst
case operating conditions verified in the end application.
(3) Isat Amperes peak for approximately 30% rolloff (@25°C)
(4) Isat Amperes peak for approximately 40% rolloff (@125°C)
DCR (5)
(Ω)
Typ.
0.0040
0.0067
0.0097
0.016
0.022
0.033
0.041
0.053
0.064
0.094
0.141
0.183
0.275
0.397
0.530
0.609
0.932
1.23
1.85
2.67
3.89
4.46
5.15
K-factor (6)
60.6
33.7
27.5
20.2
17.8
14.4
12.1
11.2
9.8
8.2
6.7
5.5
4.5
3.8
3.5
3.1
2.6
2.1
1.7
1.4
1.2
1.1
1.0
(5) DCR limits @ 25°C
(6) K-factor: Used to determine B p-p for core loss (see graph).
B p-p = K*L*∆I, B p-p(mT), K: (K factor from table), L: (Inductance in µH),
∆I (Peak to peak ripple current in Amps).
(7) Part Number Definition: DRAxxx-xxx-R
DRAxxx = Product code and size; -xxx = Inductance value in uH;
R = decimal point; If no R is present, third character = # of zeros.
-R suffix = RoHS compliant
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Part Number
DRA74-R33-R
DRA74-1R0-R
DRA74-1R5-R
DRA74-2R2-R
DRA74-3R3-R
DRA74-4R7-R
DRA74-6R8-R
DRA74-8R2-R
DRA74-100-R
DRA74-150-R
DRA74-220-R
DRA74-330-R
DRA74-470-R
DRA74-680-R
DRA74-820-R
DRA74-101-R
DRA74-151-R
DRA74-221-R
DRA74-331-R
DRA74-471-R
DRA74-681-R
DRA74-821-R
DRA74-102-R
DRA124-R47-R
DRA124-1R0-R
DRA124-1R5-R
DRA124-2R2-R
DRA124-3R3-R
DRA124-4R7-R
DRA124-6R8-R
DRA124-8R2-R
DRA124-100-R
DRA124-150-R
DRA124-220-R
DRA124-330-R
DRA124-470-R
DRA124-680-R
DRA124-820-R
DRA124-101-R
DRA124-151-R
DRA124-221-R
DRA124-331-R
DRA124-471-R
DRA124-681-R
DRA124-821-R
DRA124-102-R
DRA125-R47-R
DRA125-1R0-R
DRA125-1R5-R
DRA125-2R2-R
DRA125-3R3-R
DRA125-4R7-R
DRA125-6R8-R
DRA125-8R2-R
DRA125-100-R
Rated
Inductance
0.33
1.00
1.50
2.20
3.30
4.70
6.80
8.20
10.0
15.0
22.0
33.0
47.0
68.0
82.0
100
150
220
330
470
680
820
1000
0.47
1.00
1.50
2.20
3.30
4.70
6.80
8.20
10.0
15.0
22.0
33.0
47.0
68.0
82.0
100
150
220
330
470
680
820
1000
0.47
1.00
1.50
2.20
3.30
4.70
6.80
8.20
10.0
OCL (1)
µH
+/-20%
0.288
0.897
1.31
2.33
3.05
4.68
6.51
8.51
9.62
15.14
22.25
33.21
46.56
68.37
81.45
98.5
150.9
218.9
328.9
471.5
682.8
815.0
1001.7
0.423
0.821
1.36
2.04
2.79
4.74
7.28
8.88
10.37
14.10
23.00
34.13
46.27
69.77
80.57
98.8
151.7
209.6
326.9
473.0
682.1
826.7
1001.0
0.453
0.854
1.41
2.12
2.89
4.90
6.23
7.49
9.22
Irms (2)
Amperes
Isat (3)
Amperes
Isat (4)
Amperes
7.26
6.01
5.55
4.82
4.16
3.41
2.91
2.66
2.56
2.06
1.68
1.37
1.14
0.996
0.879
0.822
0.661
0.544
0.435
0.383
0.315
0.279
0.260
15.15
11.65
9.36
7.64
6.94
5.47
4.46
3.87
3.67
3.10
2.44
1.98
1.78
1.454
1.285
1.199
0.967
0.865
0.690
0.568
0.466
0.406
0.380
18.47
15.94
12.89
10.61
9.69
7.67
6.81
6.41
5.57
18.40
10.22
8.36
6.13
5.41
4.38
3.68
3.17
2.97
2.36
1.96
1.61
1.37
1.108
1.034
0.929
0.748
0.626
0.514
0.420
0.352
0.327
0.292
30.80
22.00
17.11
14.00
11.85
9.06
7.33
6.70
6.16
5.31
4.16
3.42
2.91
2.369
2.232
2.000
1.621
1.363
1.092
0.911
0.759
0.697
0.629
33.20
23.71
18.44
15.09
12.77
9.76
8.74
7.90
7.22
14.72
8.18
6.69
4.91
4.33
3.50
2.94
2.54
2.37
1.89
1.57
1.29
1.099
0.887
0.827
0.743
0.598
0.501
0.411
0.336
0.282
0.262
0.234
24.6
17.6
13.7
11.2
9.48
7.25
5.87
5.36
4.93
4.25
3.33
2.74
2.325
1.895
1.786
1.600
1.297
1.090
0.874
0.729
0.607
0.557
0.503
26.56
18.97
14.76
12.07
10.22
7.81
6.99
6.32
5.77
(1) Open Circuit Inductance test parameters: 100kHz, 0.25V, 0.0Adc,
tolerance is ±20%
(2) Irms: DC current for an approximate ∆T of 40°C without core loss. Derating is
necessary for AC currents. PCB layout, trace thickness and width, air-flow, and
proximity of other heat generating components will affect the temperature rise. It
is recommended that the temperature of the part not exceed 165°C under worst
case operating conditions verified in the end application.
(3) Isat Amperes peak for approximately 30% rolloff (@25°C)
(4) Isat Amperes peak for approximately 40% rolloff (@125°C)
DCR (5)
(Ω)
Typ.
0.0054
0.0078
0.0092
0.012
0.016
0.024
0.034
0.040
0.043
0.067
0.100
0.151
0.219
0.286
0.367
0.419
0.648
0.96
1.50
1.93
2.86
3.63
4.19
0.0019
0.0031
0.0049
0.007
0.009
0.014
0.021
0.028
0.031
0.044
0.071
0.108
0.134
0.201
0.257
0.296
0.454
0.568
0.892
1.32
1.96
2.57
2.94
0.0016
0.0021
0.0033
0.0048
0.0058
0.0092
0.012
0.013
0.017
K-factor (6)
52.6
29.2
23.9
17.5
15.5
12.5
10.5
9.1
8.5
6.7
5.6
4.6
3.9
3.2
3.0
2.7
2.1
1.8
1.5
1.2
1.0
0.9
0.8
16.7
12.0
9.3
7.6
6.4
4.9
4.0
3.6
3.3
2.9
2.3
1.9
1.6
1.3
1.2
1.1
0.9
0.7
0.6
0.5
0.4
0.4
0.3
16.7
12.0
9.3
7.6
6.4
4.9
4.4
4.0
3.6
(5) DCR limits @ 25°C
(6) K-factor: Used to determine B p-p for core loss (see graph).
B p-p = K*L*∆I, B p-p(mT), K: (K factor from table), L: (Inductance in µH),
∆I (Peak to peak ripple current in Amps).
(7) Part Number Definition: DRAxxx-xxx-R
DRAxxx = Product code and size; -xxx = Inductance value in uH;
R = decimal point; If no R is present, third character = # of zeros.
-R suffix = RoHS compliant
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Part Number
DRA125-150-R
DRA125-220-R
DRA125-330-R
DRA125-470-R
DRA125-680-R
DRA125-820-R
DRA125-101-R
DRA125-151-R
DRA125-221-R
DRA125-331-R
DRA125-471-R
DRA125-681-R
DRA125-821-R
DRA125-102-R
DRA127-R47-R
DRA127-1R0-R
DRA127-1R5-R
DRA127-2R2-R
DRA127-3R3-R
DRA127-4R7-R
DRA127-6R8-R
DRA127-8R2-R
DRA127-100-R
DRA127-150-R
DRA127-220-R
DRA127-330-R
DRA127-470-R
DRA127-680-R
DRA127-820-R
DRA127-101-R
DRA127-151-R
DRA127-221-R
DRA127-331-R
DRA127-471-R
DRA127-681-R
DRA127-821-R
DRA127-102-R
Rated
Inductance
15.0
22.0
33.0
47.0
68.0
82.0
100
150
220
330
470
680
820
1000
0.47
1.00
1.50
2.20
3.30
4.70
6.80
8.20
10.0
15.0
22.0
33.0
47.0
68.0
82.0
100
150
220
330
470
680
820
1000
OCL (1)
µH
+/-20%
14.67
20.65
31.47
47.83
68.48
80.86
97.6
150.0
222.8
325.1
466.3
683.3
813.6
992.8
0.413
0.772
1.27
1.92
3.51
4.58
6.72
8.33
9.63
14.90
21.47
32.01
47.91
68.22
83.91
100.8
151.2
219.8
328.3
474.5
676.6
824.6
998.7
Irms (2)
Amperes
Isat (3)
Amperes
Isat (4)
Amperes
4.45
3.95
3.19
2.59
2.125
2.005
1.745
1.409
1.142
0.998
0.826
0.673
0.632
0.552
22.50
19.22
15.32
12.52
9.59
8.14
7.32
6.33
6.02
4.83
3.98
3.22
2.62
2.333
2.008
1.888
1.524
1.253
1.011
0.827
0.736
0.637
0.598
5.72
4.74
3.86
3.13
2.635
2.406
2.213
1.785
1.469
1.194
1.006
0.834
0.758
0.695
56.0
40.0
31.1
25.5
18.7
16.5
13.3
12.2
11.2
9.03
7.57
6.22
5.09
4.18
3.84
3.46
2.83
2.35
1.93
1.62
1.33
1.22
1.10
4.58
3.79
3.09
2.506
2.108
1.925
1.771
1.428
1.175
0.955
0.805
0.667
0.606
0.556
44.8
32.0
24.9
20.4
14.93
13.18
10.67
9.74
8.96
7.23
6.05
4.98
4.07
3.34
3.07
2.77
2.26
1.88
1.54
1.29
1.06
0.978
0.878
(1) Open Circuit Inductance test parameters: 100kHz, 0.25V, 0.0Adc,
tolerance is ±20%
(2) Irms: DC current for an approximate ∆T of 40°C without core loss. Derating is
necessary for AC currents. PCB layout, trace thickness and width, air-flow, and
proximity of other heat generating components will affect the temperature rise. It
is recommended that the temperature of the part not exceed 165°C under worst
case operating conditions verified in the end application.
(3) Isat Amperes peak for approximately 30% rolloff (@25°C)
(4) Isat Amperes peak for approximately 40% rolloff (@125°C)
DCR (5)
(Ω)
Typ.
0.027
0.035
0.053
0.081
0.120
0.135
0.178
0.273
0.416
0.543
0.79
1.20
1.36
1.78
0.0012
0.0017
0.0027
0.0040
0.0068
0.0094
0.012
0.016
0.017
0.027
0.040
0.060
0.091
0.115
0.155
0.175
0.269
0.398
0.612
0.91
1.15
1.54
1.75
K-factor (6)
2.9
2.4
1.9
1.6
1.3
1.2
1.1
0.9
0.7
0.6
0.5
0.4
0.4
0.4
14.3
10.2
7.9
6.5
4.8
4.2
3.4
3.1
2.9
2.3
1.9
1.6
1.3
1.1
1.0
0.9
0.7
0.6
0.5
0.4
0.3
0.3
0.3
(5) DCR limits @ 25°C
(6) K-factor: Used to determine B p-p for core loss (see graph).
B p-p = K*L*∆I, B p-p(mT), K: (K factor from table), L: (Inductance in µH),
∆I (Peak to peak ripple current in Amps).
(7) Part Number Definition: DRAxxx-xxx-R
DRAxxx = Product code and size; -xxx = Inductance value in uH;
R = decimal point; If no R is present, third character = # of zeros.
-R suffix = RoHS compliant
Mechanical Diagrams
DRA73 Series
BOTTOM VIEW
FRONT VIEW
TOP VIEW
RECOMMENDED PCB LAYOU T
7.6 Max
2
7.6 Max
1.5
Dimensions in Millimeters.
1
2.50
2.00
3.55
Max
###
wwllyy R
1
SCHEMATIC
3.25
2
8.50
### = Inductance value in uH. R = decimal point.
If no R is present third character = # of zeros
wwllyy = (date code) R = revision level
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Mechanical Diagrams
DRA74 Series
BOTTOM VIEW
TOP VIEW
FRONT VIEW
RECOMMENDED PCB LA YOUT
7.6 Max
SCHEMATIC
1
2.50
7.6 Max
###
wwllyy R
2
2.00
1
3.25
2
4.35
Max
8.50
1.5
DRA124 Series
FRONT VIEW
BOTTOM VIEW
TOP VIEW
RECOMMENDED PCB LAYOUT
3.85
1
12.50
Max
5.00
2
12.50
Max
DRA124
###
wwllyy R
1
5.5
2
4.5
Max
13.8
2.50
DRA125 Series
BOTTOM VIEW
FRONTVIEW
TOP VIEW
RECOMMENDED PCBLAYOUT
SCHEMATIC
3.85
12.50
Max
5.00
2
12.50
Max
DRA125
###
wwllyy R
1
1
5.5
2
6.0
Max
2.50
13.8
DRA127 Series
BOTTOM VIEW
FRONT VIEW
TOP VIEW
RECOMMENDED PCB LAYOUT
SCHEMA TIC
3.85
12.50
Max
5.00
2
12.50
Max
2.50
Dimensions in Millimeters.
DRA127
###
wwllyy R
1
1
5.5
2
8.0
Max
13.8
### = Inductance value in uH. R = decimal point.
If no R is present third character = # of zeros
wwllyy = (date code) R = revision level
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Packaging Information
DRA73 Series
Ø1.50+0.1/-0.0
2.00 ±0.1
4.00
A
1.75±0.10
Bo
A0= 7.90mm
B0= 7.90 mm
K0= 3.80mm
7.50±0.1 16.00
±0.3
DRA73
###
Ø1.50 Min.
A
Ko
Ao
Parts packaged on 13" Diameter reel,
1,350 parts per reel.
12.00
SECTION A-A
User direction of feed
DRA74 Series
Ø1.50 +0.1/-0.0
2.00 ±0.1
4.00
Ø1.50 Min.
A
A
Ko
User direction of feed
Ao
SECTION A-A
DRA124 Series
Parts packaged on 13" Diameter reel,
1,100 parts per reel.
12.00
1.5 dia
+0.1/-0.0
2.0
1.5 dia
min
A
1.75
11.5
DRA124-###
wwllyy R
B0
A0= 13.00 mm
B0= 13.00mm
K0= 4.90 mm
7.50±0.1 16.00
±0.3
DRA74
###
Bo
A0= 7.90 mm
B0= 7.90 mm
K0= 4.70 mm
1.75±0.10
K0
24.0
+/-0.3
A0
SECTION A-A
A
16.00
Parts packaged on 13" Diameter reel,
750 parts per reel.
User direction of feed
DRA125 Series
1.5 dia
+0.1/-0.0
A0= 13.00 mm
B0= 13.00 mm
K0= 6.30 mm
K0
A
1.75
11.5
24.0
+/-0.3
A0
SECTION A-A
1.5 dia
min
DRA125-###
wwllyy R
B0
2.0
A
16.00
Parts packaged on 13" Diameter reel,
600 parts per reel.
User direction of feed
DRA127 Series
1.5 dia
+0.1/-0.0
A0= 13.00mm
B0= 13.00 mm
K0= 8.30mm
K0
SECTION A-A
1.5 dia
min
1.75
11.5
A0
24.0
+/-0.3
20.00
User direction of feed
Dimensions are in millimeters.
A
DRA127-###
wwllyy R
B0
2.0
A
Parts packaged on 13" Diameter reel,
350 parts per reel.
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Temperature Rise vs. Watt Loss
DRA 74 series
70
70
60
60
50
50
Temp. Rise(°C)
Temp. Rise(°C)
DRA 73 series
40
30
40
30
20
20
10
10
0
0
0
0.04
0.08
0.12
0.16
0.2
0.24
0.28
0.32
0.36
0.4
0.44
0.48
0.52
0.56
0.6
0.64
0
0.68
0.1
0.2
0.3
0.4
0.5
DRA 124 series
0.7
0.8
0.9
1
1.1
1.2
DRA 125 series
70
60
60
50
50
Temp. Rise(°C)
70
40
30
40
30
20
20
10
10
0
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
0
1.3
0.1
0.2
0.3
0.4
0.5
0.6
DRA 127 series
80
70
60
50
40
30
20
10
0
0
0.7
Total Loss (W)
To t a l L o ss (W )
Temp. Rise(°C)
Temp. Rise(°C)
0.6
Total Loss (W)
To t a l L o ss (W )
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Total Loss (W)
0.9
1
1.1
1.2
1.3
1.4
1.5
0.8
0.9
1
1.1
1.2
1.3
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Inductance Characteristics
OCL vs Isat/DRA 74 series
OCL vs Isat/DRA 73 series
120 %
120 %
110 %
110 %
100 %
100 %
90 %
90 %
80 %
-40°
70 %
60 %
25°
50 %
% of O CL
% of OCL
80 %
- 40°
70 %
60 %
25°
50 %
40 %
40 %
85°
30 %
20 %
85°
30 %
20 %
125°
125°
10 %
10 %
0%
0%
0%
10 %
20%
30 %
40%
50 %
60%
70 %
80%
90 %
100 %
110 % 120 % 130 % 140 %
0%
10 %
20%
30 %
40%
50 %
% of Isat
70 %
80%
90 %
100 %
110 %
120 %
OCL vs Isat/DRA 125 series
OCL vs Isat/DRA 124 series
120 %
110 %
110 %
100 %
100 %
90 %
90 %
80 %
80 %
70 %
-40°
60 %
50 %
% of OCL
120 %
70 %
-40°
60 %
25°
50 %
25°
40 %
40 %
85°
30 %
85°
30 %
125°
20 %
20 %
10 %
10 %
125°
0%
0%
0%
10 %
20%
30 %
40%
50 %
60%
70 %
80%
90 % 100 % 110 % 120 % 130 % 140 % 150 % 160 %
0%
10 %
20%
30 %
40%
50 %
% of Isat
60%
70 %
80%
% of Isat
OCL vs Isat/DRA 127 series
120 %
110 %
100 %
90 %
-40°
80 %
% of OCL
% of OCL
60%
% of Isat
25°
70 %
60 %
85°
50 %
125°
40 %
30 %
20 %
10 %
0%
60 %
70%
80 %
90%
100 % 110 % 120 % 130 % 140 % 150 % 160 % 170 % 180 % 190 % 200 %
% of Isat
90 %
100 % 110 % 120 % 130 % 140 %
DRA Series
High Power Density,
High Efficiency, Shielded Inductors
Magnetics Solutions
For Automotive Applications
Inductance Characteristics
DRA 73 series
DRA 74 series
100
100
1MHz
1MHz
10
500kHz
1
300kHz
200kHz
300kHz
200kHz
1
Core Loss (W)
Core Loss (W)
100kHz
50kHz
0.1
500kHz
10
0.01
100kHz
50kHz
0.1
0.01
0.001
0.001
0.0001
0.00001
1
10
100
100
0.0001
1
10
Bp-p (mT)
100
DRA 124 series
DRA 125 series
1000
1000
1MHz
1MHz
100
100
500kHz
500kHz
300kHz
200kHz
10
100kHz
50kHz
1
300kHz
200kHz
10
100kHz
Core Loss (W)
Core Loss (W)
1000
Bp-p (mT)
0.1
50kHz
1
0.1
0.01
0.01
0.001
0.001
0.0001
0.0001
1
10
100
1
1000
10
100
1000
Bp-p (mT)
Bp-p (mT)
DRA 127 series
1000
1MHz
100
500kHz
10
200kHz
Core Loss (W)
300kHz
100kHz
50kHz
1
0.1
0.01
0.001
1
10
100
1000
Bp-p (mT)
PM-4319 3/07
© Cooper Electronic
Technologies 2007
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