DRQ Series
Dual Winding, Shielded Inductors/Transformer
1207 BU-SB07326 Page 1 of 7 Data Sheet 4311
Description
• 125°Cmaximum total operating temperature
•Dual winding inductors that can be used as either
asingle inductor, or in coupled inductor/transformer applications
(1:1 turns ratio)
•Four sizes of shielded drum core inductors
• Windings can be connected in series or parallel, offering a broad
range of inductance and current ratings
•Peak current ratings from 0.13 amps to 56 amps
• RMS current ratings from 0.128 amps to 17.9 amps
• Inductance ratings from 0.33µH to 4.02mH
• Surface Mount
• 200Vac Isolation between windings
• Ferrite core material
Applications
•As a transformer: SEPIC, flyback
• As an inductor: buck, boost, coupled inductor
• DC-DC converters
• VRM inductor for CPU and DDR power supplies
• Input and output filter chokes
Environmental Data
•Storage temperature: -40°C to +125°C
• Operating temperature: -40°C to +125°C (range is application
specific).
•Solder reflow temperature: 260°C max. for 10 seconds max.
Packaging
•Supplied in tape and reel packaging, 1350 (DRQ73),
1100 (DRQ74), 600 (DRQ125), and 350 (DRQ127) per reel
Parallel Ratings Series Ratings
Part Number Rated OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5) OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5)
Inductance +/-20% Amps Amps typ. µ-Sec +/-20% Amps Amps typ. µ-Sec
(µH) (µH) Peak (µH) Peak
DRQ73-R33-R 0.33 0.306 6.19 14.4 0.0074 1.98 1.224 3.10 7.18 0.0296 3.96
DRQ73-1R0-R 1.00 0.992 5.25 7.97 0.0103 3.56 3.968 2.63 3.99 0.0411 7.12
DRQ73-1R5-R 1.50 1.482 4.64 6.52 0.0132 4.36 5.928 2.32 3.26 0.0527 8.72
DRQ73-2R2-R 2.20 2.070 4.11 5.52 0.0167 5.15 8.280 2.06 2.76 0.0669 10.3
DRQ73-3R3-R 3.30 3.540 3.31 4.22 0.0259 6.73 14.16 1.66 2.11 0.1035 13.5
DRQ73-4R7-R 4.70 4.422 3.09 3.78 0.0297 7.52 17.69 1.55 1.89 0.1188 15.0
DRQ73-6R8-R 6.80 6.480 2.55 3.12 0.0435 9.11 25.92 1.28 1.56 0.1742 18.2
DRQ73-8R2-R 8.20 8.930 2.19 2.66 0.0592 10.7 35.72 1.10 1.33 0.2368 21.4
DRQ73-100-R 10.0 10.30 2.08 2.47 0.0656 11.5 41.20 1.04 1.24 0.2623 23.0
DRQ73-150-R 15.0 15.01 1.83 2.05 0.0844 13.9 60.04 0.916 1.03 0.339 27.8
DRQ73-220-R 22.0 22.65 1.62 1.67 0.107 17.0 90.60 0.811 0.83 0.429 34.0
DRQ73-330-R 33.0 34.41 1.31 1.35 0.166 21.0 137.6 0.653 0.68 0.665 42.0
DRQ73-470-R 47.0 48.62 1.08 1.14 0.241 24.9 194.5 0.542 0.57 0.965 49.8
DRQ73-680-R 68.0 68.91 0.89 0.96 0.358 29.7 275.6 0.444 0.48 1.43 59.4
DRQ73-820-R 82.0 80.37 0.86 0.89 0.384 32.1 321.5 0.430 0.44 1.54 64.2
DRQ73-101-R 100 101.4 0.73 0.79 0.527 36.0 405.6 0.367 0.39 2.11 72.0
1) Open Circuit Inductance Test Parameters: 100kHz, 0.25 Vrms, 0.0 Adc
Parallel: (1,2 -4,3) Series: (1-4) tie (2-3)
2) RMS current for an approximate ∆T of 40°C without core loss. It is recommended that the
temperature of the part not exceed 125°C.
3) Peak current for approximately 30% roll-off at 20°C
4) DCR limits @ 20°C
5) Applied Volt-Time product (V-µS) across the inductor. This value represents the applied V-µS
at 100KHz necessary to generate a core loss equal to 10% of the total losses for a 40°C
temperature rise.
6) Turns Ratio (1:3):(2-4) 1:1
7) Part number definition: DRQxxx-yyy-R
DRQxxx = product code and size,
-yyy = inductance value in µH,
R = decimal point. If no R is present, third character = # of zeros
-R suffix = RoHS compliant
1207 BU-SB07326 Page 2 of 7 Data Sheet 4311
Parallel Ratings Series Ratings
Part Number Rated OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5) OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5)
Inductance +/-20% Amps Amps typ. µ-Sec +/-20% Amps Amps typ. µ-Sec
(µH) (µH) Peak (µH) Peak
DRQ73-151-R 150 150.9 0.58 0.65 0.851 44.0 603.6 0.289 0.32 3.41 88.0
DRQ73-221-R 220 223.3 0.52 0.53 1.05 53.5 893.2 0.260 0.27 4.20 107
DRQ73-331-R 330 325.5 0.42 0.44 1.59 64.5 1302 0.211 0.22 6.36 129
DRQ73-471-R 470 465.8 0.35 0.37 2.36 77.2 1863 0.173 0.18 9.44 154
DRQ73-681-R 680 676.5 0.29 0.31 3.47 93.1 2706 0.143 0.15 13.88 186
DRQ73-821-R 820 821.7 0.27 0.28 3.93 103 3287 0.134 0.14 15.72 206
DRQ73-102-R 1000 995.0 0.26 0.25 4.34 113 3980 0.128 0.13 17.36 226
DRQ74-R33-R 0.33 0.294 6.20 18.4 0.0074 1.71 1.176 3.10 9.18 0.0295 3.42
DRQ74-1R0-R 1.00 0.952 5.33 10.2 0.0100 3.08 3.808 2.66 5.10 0.0400 6.16
DRQ74-1R5-R 1.50 1.422 4.96 8.35 0.0115 3.76 5.688 2.48 4.17 0.0461 7.52
DRQ74-2R2-R 2.20 1.986 4.66 7.06 0.0130 4.45 7.944 2.33 3.53 0.0521 8.9
DRQ74-3R3-R 3.30 3.396 3.94 5.40 0.0183 5.81 13.58 1.97 2.70 0.0732 11.6
DRQ74-4R7-R 4.70 5.182 3.34 4.37 0.0254 7.18 20.73 1.67 2.19 0.102 14.4
DRQ74-6R8-R 6.80 7.344 2.60 3.67 0.0418 8.55 29.38 1.30 1.84 0.167 17.1
DRQ74-8R2-R 8.20 8.566 2.53 3.40 0.0441 9.23 34.26 1.27 1.70 0.177 18.5
DRQ74-100-R 10.0 9.882 2.41 3.17 0.0489 9.92 39.53 1.20 1.58 0.196 19.8
DRQ74-150-R 15.0 16.09 2.11 2.48 0.0637 12.7 64.36 1.05 1.24 0.255 25.4
DRQ74-220-R 22.0 21.73 1.75 2.13 0.0925 14.7 86.92 0.874 1.07 0.371 29.4
DRQ74-330-R 33.0 33.01 1.41 1.73 0.143 18.1 132.0 0.702 0.87 0.574 36.2
DRQ74-470-R 47.0 49.64 1.15 1.41 0.216 22.2 198.6 0.573 0.71 0.865 44.4
DRQ74-680-R 68.0 69.67 1.03 1.19 0.265 26.3 278.7 0.517 0.60 1.06 52.6
DRQ74-820-R 82.0 80.95 0.91 1.11 0.345 28.4 323.8 0.453 0.55 1.38 56.8
DRQ74-101-R 100 101.6 0.86 0.99 0.383 31.8 406.4 0.430 0.49 1.53 63.6
DRQ74-151-R 150 150.0 0.69 0.81 0.591 38.6 600.0 0.346 0.41 2.37 77.2
DRQ74-221-R 220 227.0 0.56 0.66 0.907 47.5 908.0 0.279 0.33 3.63 95
DRQ74-331-R 330 335.6 0.45 0.54 1.41 57.8 1342 0.224 0.27 5.66 116
DRQ74-471-R 470 465.3 0.40 0.46 1.74 68.1 1861 0.202 0.23 6.97 136
DRQ74-681-R 680 671.2 0.33 0.38 2.58 81.7 2685 0.166 0.19 10.3 163
DRQ74-821-R 820 812.7 0.31 0.35 2.93 89.9 3251 0.156 0.17 11.7 180
DRQ74-102-R 1000 1009 0.27 0.31 3.89 100 4036 0.135 0.16 15.6 200
DRQ125-R47-R 0.47 0.456 17.6 33.0 0.0018 3.17 1.824 8.80 16.5 0.0078 6.34
DRQ125-1R0-R 1.00 0.894 15.0 23.6 0.0024 4.43 3.576 7.51 11.8 0.0096 8.86
DRQ125-1R5-R 1.50 1.478 13.8 18.3 0.0029 5.70 5.912 6.89 9.15 0.0114 11.40
DRQ125-2R2-R 2.20 2.208 10.9 15.0 0.0045 6.97 8.832 5.46 7.50 0.0182 13.9
DRQ125-3R3-R 3.30 3.084 9.26 12.7 0.0063 8.23 12.34 4.63 6.35 0.0253 16.5
DRQ125-4R7-R 4.70 5.274 7.18 9.71 0.0105 10.8 21.10 3.59 4.86 0.0420 21.6
DRQ125-6R8-R 6.80 6.588 6.64 8.68 0.0123 12.0 26.35 3.32 4.34 0.0492 24.0
DRQ125-8R2-R 8.20 8.048 5.54 7.86 0.0176 13.3 32.19 2.77 3.93 0.0705 26.6
DRQ125-100-R 10.0 9.654 5.35 7.17 0.0189 14.6 38.62 2.67 3.59 0.0757 29.2
DRQ125-150-R 15.0 15.35 4.27 5.69 0.0298 18.4 61.40 2.13 2.85 0.120 36.8
DRQ125-220-R 22.0 22.36 3.70 4.71 0.0396 22.2 89.44 1.84 2.36 0.159 44.4
DRQ125-330-R 33.0 33.74 3.28 3.84 0.0505 27.2 135.0 1.64 1.92 0.203 54.4
DRQ125-470-R 47.0 47.47 2.71 3.24 0.0740 32.3 189.9 1.35 1.62 0.297 64.6
DRQ125-680-R 68.0 67.91 2.22 2.70 0.101 38.6 271.6 1.11 1.35 0.440 77.2
1) Open Circuit Inductance Test Parameters: 100kHz, 0.25 Vrms, 0.0 Adc
Parallel: (1,2 -4,3) Series: (1-4) tie (2-3)
2) RMS current for an approximate ∆T of 40°C without core loss. It is recommended that the
temperature of the part not exceed 125°C.
3) Peak current for approximately 30% roll-off at 20°C
4) DCR limits @ 20°C
5) Applied Volt-Time product (V-µS) across the inductor. This value represents the applied V-µS
at 100KHz necessary to generate a core loss equal to 10% of the total losses for a 40°C
temperature rise.
6) Turns Ratio (1:3):(2-4) 1:1
7) Part number definition: DRQxxx-yyy-R
DRQxxx = product code and size,
-yyy = inductance value in µH,
R = decimal point. If no R is present, third character = # of zeros
-R suffix = RoHS compliant
1207 BU-SB07326 Page 3 of 7 Data Sheet 4311
Parallel Ratings Series Ratings
Part Number Rated OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5) OCL(1) Irms(2) Isat(3) DCR Ω
Ω (4) Volt(5)
Inductance +/-20% Amps Amps typ. µ-Sec +/-20% Amps Amps typ. µ-Sec
(µH) (µH) Peak (µH) Peak
DRQ125-820-R 82.0 86.89 2.05 2.39 0.128 43.7 347.6 1.03 1.20 0.515 87.4
DRQ125-101-R 100 102.7 1.78 2.20 0.170 47.5 410.8 0.892 1.10 0.682 95.0
DRQ125-151-R 150 151.1 1.48 1.81 0.248 57.6 604.4 0.739 0.905 0.991 115.2
DRQ125-221-R 220 216.8 1.19 1.51 0.384 69.0 867.2 0.594 0.755 1.54 138
DRQ125-331-R 330 332.6 1.06 1.22 0.482 85.5 1330 0.530 0.610 1.93 171
DRQ125-471-R 470 473.1 0.87 1.02 0.718 102 1892 0.434 0.510 2.87 204
DRQ125-681-R 680 679.8 0.70 0.85 1.10 122 2719 0.350 0.425 4.42 244
DRQ125-821-R 820 828.0 0.60 0.77 1.49 135 3312 0.301 0.385 5.96 270
DRQ125-102-R 1000 1008 0.57 0.70 1.69 149 4032 0.283 0.350 6.76 298
DRQ127-R47-R 0.47 0.419 17.9 56.0 0.00195 3.50 1.676 8.94 28 0.0078 7.00
DRQ127-1R0-R 1.00 0.821 15.5 40.0 0.00261 4.90 3.284 7.74 20 0.0104 9.80
DRQ127-1R5-R 1.50 1.357 13.5 31.1 0.00341 6.30 5.428 6.77 15.6 0.0137 12.60
DRQ127-2R2-R 2.20 2.027 12.5 25.5 0.00373 7.70 8.108 6.23 12.7 0.0161 15.4
DRQ127-3R3-R 3.30 2.831 10.4 21.5 0.00567 9.10 11.32 5.23 10.8 0.0229 18.2
DRQ127-4R7-R 4.70 4.841 8.25 16.5 0.00917 11.9 19.36 4.13 8.24 0.0367 23.8
DRQ127-6R8-R 6.80 7.387 7.34 13.3 0.0116 14.7 29.55 3.67 6.67 0.0465 29.4
DRQ127-8R2-R 8.20 8.861 6.32 12.2 0.0157 16.1 35.44 3.16 6.09 0.0627 32.2
DRQ127-100-R 10.0 10.47 6.04 11.2 0.0172 17.5 41.88 3.02 5.60 0.0686 35.0
DRQ127-150-R 15.0 14.09 5.03 9.66 0.0247 20.3 56.36 2.51 4.83 0.0990 40.6
DRQ127-220-R 22.0 22.93 4.00 7.57 0.0391 25.9 91.72 2.00 3.78 0.157 51.8
DRQ127-330-R 33.0 33.92 3.23 6.22 0.0600 31.5 135.7 1.61 3.11 0.241 63.0
DRQ127-470-R 47.0 47.05 2.95 5.28 0.0719 37.1 188.2 1.47 2.64 0.288 74.2
DRQ127-680-R 68.0 66.48 2.44 4.44 0.105 44.1 265.9 1.22 2.22 0.421 88.2
DRQ127-820-R 82.0 79.75 2.09 4.06 0.143 48.3 319.0 1.04 2.03 0.573 96.6
DRQ127-101-R 100 99.31 1.96 3.64 0.163 53.9 397.2 0.980 1.82 0.653 107.8
DRQ127-151-R 150 144.9 1.59 3.01 0.247 65.1 579.6 0.796 1.51 0.989 130.2
DRQ127-221-R 220 221.5 1.29 2.43 0.376 80.5 886.0 0.645 1.22 1.50 161
DRQ127-331-R 330 323.6 1.04 2.01 0.574 97.3 1294 0.522 1.01 2.30 195
DRQ127-471-R 470 467.1 0.85 1.68 0.861 117 1868 0.427 0.838 3.44 234
DRQ127-681-R 680 676.7 0.76 1.39 1.08 141 2707 0.380 0.697 4.32 282
DRQ127-821-R 820 818.1 0.65 1.27 1.47 155 3272 0.325 0.633 5.88 310
DRQ127-102-R 1000 1005 0.61 1.14 1.66 172 4020 0.307 0.571 6.64 344
1) Open Circuit Inductance Test Parameters: 100kHz, 0.25 Vrms, 0.0 Adc
Parallel: (1,2 -4,3) Series: (1-4) tie (2-3)
2) RMS current for an approximate ∆T of 40°C without core loss. It is recommended that the
temperature of the part not exceed 125°C.
3) Peak current for approximately 30% roll-off at 20°C
4) DCR limits @ 20°C
5) Applied Volt-Time product (V-µS) across the inductor. This value represents the applied V-µS
at 100KHz necessary to generate a core loss equal to 10% of the total losses for a 40°C
temperature rise.
6) Turns Ratio (1:3):(2-4) 1:1
7) Part number definition: DRQxxx-yyy-R
DRQxxx = product code and size,
-yyy = inductance value in µH,
R = decimal point. If no R is present, third character = # of zeros
-R suffix = RoHS compliant
1207 BU-SB07326 Page 4 of 7 Data Sheet 4311
Bottom View
0.60
6.1
0.73
7.6
Max
Side View
Top View
DRQ74
###
•
7.97.9
Series ModeDual Inductor Mode
1.73
Recommended Pad Layout
0.40
1.73
1.00 1.00 0.40
Series ModeDual Inductor
L2
3
L1
1
4
2
L1
3
1
Schematic
L2
4
2
3
1
4
Parallel Mode
L1 L2
2
7.6
Max
4.45
Max
Dimensions - mm
DRQ73 Series
Bottom View
0.60
6.1
0.73
0.80
7.6
Max.
Side View
Top View
DRQ73
###
•
7.97.9
Series ModeDual Inductor Mode
1.73
Recommended Pad Layout
0.40
1.73
1.00 1.00 0.40
Series ModeDual Inductor
L2
3
L1
1
4
2
L1
3
1
Schematic
L2
4
2
3
1
L2L1
4
Parallel Mode
2
3.55 Max
7.6
Max.
DRQ74 Series
Dimensions in millimeters. ### = Inductance value per family chart
Dot indicates pin #1
1207 BU-SB07326 Page 5 of 7 Data Sheet 4311
2.50
2.05
10.0
Bottom View
2.00
1
212.5
Max
4
3
1
2
DRQ127
###
wwllyy R
4
3
•
Dual Inductor Mode Series Mode
3.85
13.80
Recommended Pad Layout
13.80
0.50
3.85
1
2.50 2
0.50
4
3
12.5
Max
8.0
Max
Side View
Top View
Schematic
34
Dual Inductor
1
L1
2
L2
3
Series Mode
L1
1
L2 L2
Parallel Mode
43
12
L1
2
4
2.50
2.05
12.5
Max
10.0
2.00
1
2
4
3
12.5
Max
Bottom View
Side View
Top View 6.00 Max
1
2
DRQ125
###
wwllyy R
4
3
•
Dual Inductor Mode Series Mode
3.85
13.80
Recommended Pad Layout
13.80
1
0.50
2
3.85
1
4
2.50
32
0.50
4
3
Schematic
Series Mode
L1L1L2
343
Dual Inductor
121
L2L1
L2
434
Parallel Mode
212
Dimensions - mm
DRQ125 Series
DRQ127 Series
Dimensions in millimeters. ### = Inductance value per family chart
wwllyy = (date code) R = revision level
Dot indicates pin #1
1207 BU-SB07326 Page 6 of 7 Data Sheet 4311
SECTION A-A
A
A
DRQ74
###
Ko
Bo
Bo
2.00
±
0.1
0.1
4.00
Ø
1.50 +0.1/-0.0
Ao
16.00
±
0.3
0.3
7.50
±
0.1
1.75
±
0.10
Ø
1.50 Min.
12.00
12.00
2
1
3
4
DRQ74 Series
Supplied in tape and reel packaging,
1100 parts per reel, 13" diameter reel.
1
2
4
3
A
A
DRQ125
###
wwllyy
•
SECTION A-A
K0
1.5 dia
+0.1/-0.0
1.5 dia
min
4.0
2.0
16.00
1.7
11.5
11.5
24.0
+/-0.3
+/-0.3
B0
B0
A0
DRQ125 Series
Supplied in tape and reel packaging,
600 parts per reel, 13" diameter reel.
1
2
4
3
A
A
DRQ127
###
wwllyy
SECTION A-A
R0.3 max.
R0.5 TYP.
K0
1.5 dia
+0.1/-0.0
1.5 dia
min
4.0
2.0
20.00
1.7
11.5
11.5
24.0
+/-0.3
+/-0.3
B0
B0
A0
DRQ127 Series
Supplied in tape and reel packaging,
350 parts per reel, 13" diameter reel.
Packaging Information
DRQ73 Series
Supplied in tape and reel packaging,
1350 parts per reel, 13" diameter reel.
Dimensions are in millimeters.
Direction of Feed ➞
Direction of Feed ➞
Direction of Feed ➞
Direction of Feed ➞
Ao=7.90mm
Bo=7.90mm
Ko=3.80mm
Ao=7.90mm
Bo=7.90mm
Ko=4.70mm
Ao=13.00mm
Bo=13.00mm
Ko=6.30mm
Ao=13.00mm
Bo=13.00mm
Ko=8.30mm
ACTUAL SIZE
DRQ73
ACTUAL SIZE
DRQ74
ACTUAL SIZE
DRQ125
ACTUAL SIZE
DRQ127
©2007 Cooper Bussmann
St. Louis, MO 63178
www.cooperbussmann.com
1207 BU-SB07326 Page 7 of 7 Data Sheet 4311
This bulletin is intended to present product design solutions and technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice,
to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any
technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
Life Support Policy: Cooper Bussmann does not authorize the use of any of its products for use in life support devices or systems without the express written approval of an officer of the
Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling,
can be reasonably expected to result in significant injury to the user.
North America
Cooper Bussmann
1225 Broken Sound Parkway NW
Suite F
Boca Raton, FL 33487-3533
Tel: 1-561-998-4100
Fax: 1-561-241-6640
Toll Free: 1-888-414-2645
Cooper Bussmann
P.O. Box 14460
St. Louis, MO 63178-4460
Tel: 1-636-394-2877
Fax: 1-636-527-1607
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Cooper Bussmann
Cooper (UK) Limited
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0
10
20
30
40
50
60
70
80
90
100
020 40 60 80 100 120 140 160
% of Isat
OCL (%)
OCL vs Isat DRQ73
0
20
40
60
80
100
020 40 60 80 100 120 140 160 180
% of Isat
OCL (%)
OCL vs Isat DRQ74
0
10
20
30
40
50
60
70
80
90
100
010 20 30 40 50 60 70 80 90 100 110 120 130 140 150
% of Isat
OCL (%)
OCL vs Isat DRQ125
0
10
20
30
40
50
60
70
80
90
100
010 20 30 40 50 60 70 80 90 100 110 120 130 140 150
% of Isat
OCL (%)
OCL vs Isat DRQ127
Irms DERATING WITH CORE LOSS
% of Applied Volt-µSecond
% of Losses from Irms (maximum)
300 KHz
200 KHz
100 KHz
50 KHz
25 KHz
Inductance Characteristics
Core Loss
