Document 260-1
Common Mode Chokes - BU Series
These low cost, high performance choke coils are de-
signed to virtually eliminate line conducted common
mode noise.
The BU9S and BU9HS families are ideal for signal line
applications; the others can be used in switching power
supplies and power supply circuits. All provide signifi-
cant attenuation of common mode noise across a broad
range of frequencies.
For height-restricted applications, the BU9 and BU9S
filters are available in a horizontal configuration, which
reduces their height to under half an inch (12.5 mm).
For free evaluation samples, contact Coilcraft or request
them on-line at
www.coilcraft.com.
Specifications subject to change without notice.
Please check our website for latest information.
Document 260-1
Revised 4/19/02
© Coilcraft, Inc. 2005
Document 260-2
Common Mode Chokes - BU9, BU9H Series
Part number
BU9-103R25B
BU9-2820R5B
BU9-1320R7B
BU9-6011R0B
BU9-2011R6B
BU9H-103R25B
BU9H-2820R5B
BU9H-1320R7B
BU9H-6011R0B
BU9H-2011R6B
Impedance max
(kOhms)
60 @ 220 kHz
53 @ 410 kHz
52 @ 660 kHz
36 @ 1300 kHz
5.4 @ 1500 kHz
60 @ 220 kHz
53 @ 410 kHz
52 @ 660 kHz
36 @ 1300 kHz
5.4 @ 1500 kHz
Frequency range
@ 75% of
impedance max
200 – 240 kHz
310 – 430 kHz
600 – 700 kHz
1200 – 1400 kHz
900 – 2100 kHz
200 – 240 kHz
310 – 430 kHz
600 – 700 kHz
1200 – 1400 kHz
900 – 2100 kHz
DCR
(Ohms)
3.5
1.0
0.5
0.2
0.1
3.5
1.0
0.5
0.2
0.1
Inductance
1
Inductance difference
Current
L1, L2
L1 - L2
max (Aac)
min (mH)
max (µH)
0.25
10.0
200
0.50
2.8
50
0.70
1.3
50
1.00
0.6
25
1.60
0.2
25
0.25
10.0
200
0.50
2.8
50
0.70
1.3
50
1.00
0.6
25
1.60
0.2
25
1. Inductance tested at 1 kHz, 1 Vrms, 0 Adc on an Agilent/HP 4284A LCR-meter or equivalent.
2. 1 kV rms typical isolation between windings.
3. Operating temperature range -25°C to +80°C.
4. Electrical specifications at 25°C.
Typical Attenuation
Typical Impedance
BU9
0.43
max
11,0
Dot
indicates
pin 1
0.69 max
17,5
BU9H
0.61 max
15,5
0.69 max
17,5
0.157 ±0.04
4,0 ±1,0
0.67
max
17,0
0.157 ±0.04
4,0 ±1,0
0.49
max
12,5
0.024 dia
0,6
0.276 ±0.02
7,0 ±0,5
1
1
4
2
3
2
3
0.31 ±0.02
8,0 ±0,5
4
1
4
0.276 ±0.02
7,0 ±0,5
0.43
max
11,0
Dot
indicates
pin 1
0.024 dia
0,6
0.31 ±0.02
8,0 ±0,5
1
2
3
2
4
3
Specifications subject to change without notice.
Please check our website for latest information. Document 260-2
Revised 04/13/05
© Coilcraft, Inc. 2005
Document 260-3
Common Mode Chokes - BU9S, BU9HS Series
Impedance max
Part number
(kOhms)
BU9S-153R15B
71 @ 210 kHz
BU9S-7020R3B
66 @ 330 kHz
BU9HS-153R15B 71 @ 210 kHz
BU9HS-7020R3B 66 @ 330 kHz
Frequency range
@ 75% of
impedance max
190 – 230 kHz
300 – 360 kHz
190 – 230 kHz
300 – 360 kHz
DCR
(Ohms)
5.0
2.5
5.0
2.5
Inductance
1
Inductance difference
Current
L1, L2
L1 - L2
max (Aac)
min (mH)
max (µH)
0.15
15.0
300
0.30
7.0
200
0.15
15.0
300
0.30
7.0
200
1. Inductance tested at 1 kHz, 1 Vrms, 0 Adc on an Agilent/HP 4284A LCR-meter or equivalent.
2. 1 kV rms typical isolation between windings.
3. Operating temperature range -25°C to +80°C.
4. Electrical specifications at 25°C.
Typical Response
Typical Impedance
BU9S
0.43
max
11,0
Dot
indicates
pin 1
0.69 max
17,5
BU9HS
0.61
max
15,5
0.69 max
17,5
0.157 ±0.04
4,0 ±1,0
0.67
max
17,0
0.157 ±0.04
4,0 ±1,0
0.49
max
12,5
0.024 dia
0,6
0.276 ±0.02
7,0 ±0,5
1
1
2
4
3
2
3
0.31 ±0.02
8,0 ±0,5
0.276 ±0.02
7,0 ±0,5
0.43
max
11,0
Dot
indicates
pin 1
0.024 dia
0,6
0.31 ±0.02
8,0 ±0,5
1
4
4
1
2
4
3
2
3
Specifications subject to change without notice.
Please check our website for latest information. Document 260-3
Revised 04/13/05
© Coilcraft, Inc. 2005
Document 260-4
Common Mode Chokes - BU10 Series
Part number
BU10-1811R2B
BU10-1311R6B
BU10-1012R2B
BU10-6003R0B
Impedance max
(kOhms)
3.9 @ 1.8 MHz
2.2 @ 2.2 MHz
1.6 @ 3.1 MHz
1.0 @ 3.0 MHz
Frequency range
@ 75% of
impedance max
1000 – 3200 kHz
800 – 2000 kHz
1300 – 8900 kHz
800 – 10000 kHz
DCR
(Ohms)
0.20
0.12
0.08
0.04
Inductance
1
Inductance difference
Current
L1, L2
L1 - L2
max (Aac)
min (mH)
max (µH)
1.20
0.18
30
1.60
0.13
20
2.20
0.10
15
3.00
0.06
10
1. Inductance tested at 1 kHz, 1 Vrms, 0 Adc on an Agilent/HP 4284A LCR-meter or equivalent.
2. 1 kV rms typical isolation between windings.
3. Operating temperature range -25°C to +80°C.
4. Electrical specifications at 25°C.
Typical Attenuation
Typical Impedance
0.67 max
17,0
Dot
indicates
pin 1
0.177 ±0.04
4,5 ±1,0
0.89
max
22,5
0.028
dia
0,7
0.394 ±0.02
10,0 ±0,5
0.51 ±0.02
13,0 ±0,5
0.75
max
19,0
1
1
4
2
3
4
2
3
Specifications subject to change without notice.
Please check our website for latest information. Document 260-4
Revised 04/13/05
© Coilcraft, Inc. 2005
Document 260-5
Common Mode Chokes - BU15 Series
Part number
BU15-4530R4B
BU15-1430R7B
BU15-7521R0B
BU15-4421R3B
BU15-2721R6B
Impedance max
(kOhms)
400 @ 230 kHz
115 @ 470 kHz
60 @ 600 kHz
36 @ 670 kHz
20 @ 1000 kHz
Frequency range
@ 75% of
impedance max
140 – 160 kHz
400 – 650 kHz
420 – 720 kHz
430 – 1000 kHz
510 – 1400 kHz
DCR
(Ohms)
3.0
1.0
0.6
0.3
0.2
Inductance
1
Inductance difference
Current
L1, L2
L1 - L2
max (Aac)
min (mH)
max (µH)
0.40
45.0
300
0.70
14.0
300
1.00
7.5
150
1.30
4.4
100
1.60
2.7
60
1. Inductance tested at 1 kHz, 1 Vrms, 0 Adc on an Agilent/HP 4284A LCR-meter or equivalent.
2. 1 kV rms typical isolation between windings.
3. Operating temperature range -25°C to +80°C.
4. Electrical specifications at 25°C.
Typical Response
Typical Impedance
0.75
max
19,0
Dot
indicates
pin 1
0.91
max
23,0
0.177 ±0.04
4,5 ±1,0
1.08
max
27,5
0.028
dia
0,7
0.40 ±0.02
10,0 ±0,5
1
1
4
2
3
0.51 ±0.02
13,0 ±0,5
4
2
3
Specifications subject to change without notice.
Please check our website for latest information. Document 260-5
Revised 04/13/05
© Coilcraft, Inc. 2005
