Document 425-1
Wideband Transformers
These wideband transformers are offered in tapped or
untapped configurations in a low-profile DIP-style plastic
case. They are available in a through-hole version com-
patible with standard DIP sockets and a surface mount
version that is packaged in tape and reel. All parts feature
500 V isolation, 250 mA current handling capability and a
1/4 Watt RF power rating. (For a smaller package size,
see our WBC Series.)
Applications include impedance matching, voltage or
current transformation, DC isolation, balanced/unbalanced
mixing, matching, power splitting, coupling and signal
inversion.
Custom wideband transformers with special combinations
of impedance ratio, insertion loss, frequency response
and current handling are also available.
Free evaluation samples are available by contacting
Coilcraft or by visiting
www.coilcraft.com.
Part number
1
SM
TH
WB1-1LS_
WB1-1L
WB1-6LS_
WB1-6L
WB1.18-3LS_
WB1.18-3L
WB1.5-6LS_
WB1.5-6L
WB2-1-2WLS_ WB2-1-2WL
WB2.5-6LS_
WB2.5-6L
WB4-6LS_
WB4-6L
WB9-1LS_
WB9-1L
WB16-1LS_
WB16-1L
WB36-1LS_
WB36-1L
WB1-1TLS_
WB1-1TL
WB1-6TLS_
WB1-6TL
WB2-1TLS_
WB2-1TL
WB2.5-6TLS_
WB2.5-6TL
WB3-1TLS_
WB3-1TL
WB4-1HLS_
WB4-1HL
WB4-6TLS_
WB4-6TL
WB5-1TLS_
WB5-1TL
WB8-1TLS_
WB8-1TL
WB13-1TLS_
WB13-1TL
WB16-6TLS_
WB16-6TL
WBT1-6LS_
WBT1-6L
WBT1.5-1LS_
WBT1.5-1L
WBT2.5-6LS_
WBT2.5-6L
WBT4-1LS_
WBT4-1L
WBT4-1ALS_
WBT4-1AL
WBT16-1LS_
WBT16-1L
WBT25-1LS_
WBT25-1L
Impedance
ratio
pri : sec
1
:
1
1
:
1
1
:
1.18
1
:
1.5
1
:
2
1
:
2.5
1
:
4
1
:
9
1
:
16
1
:
36
1
:
1
1
:
1
1
:
2
1
:
2.5
1
:
3
1
:
4
1
:
4
1
:
5
1
:
8
1
:
13
1
:
16
1
:
1
1
:
1.5
1
:
2.5
1
:
3
1
:
4
1
:
16
1
:
25
Pins 4 – 6
Insertion
loss max L min
2
DCR max
3
(dB)
(µH) (mOhm)
0.70
27
75
0.50
25
100
0.50
90
300
0.26
56
120
1.00
38
100
0.26
30
100
0.50
25
100
0.57
25
100
0.60
56
75
0.50
25
50
0.51
25
100
0.20
70
150
1.00
38
100
0.28
56
120
0.40
96
110
0.50
25
120
0.50
43
120
0.30
48
220
0.76
18
100
0.72
17
90
0.60
56
75
0.25
70
150
0.30
60
150
0.26
70
150
0.26
45
120
0.40
96
110
0.50
25
100
0.50
25
100
Pins 1 – 3
DC
L min
2
DCR max
3
imbalance
4
(µH) (mOhm)
max (mA)
27
75
—
25
100
—
108
330
—
84
150
—
75
150
—
75
130
—
100
200
—
225
250
—
896
330
—
900
180
—
25
100
30
70
150
18
75
150
29
140
200
13
270
200
4.0
100
160
15
172
160
5.0
240
500
13
144
270
17
221
200
10
896
330
25
70
150
19
90
180
19
175
200
11
135
160
13
384
220
3.5
400
300
7.5
625
350
6.0
Schematic
1
6
4
3
6
1
2
4
3
6
5
4
1
2
3
Bandwidth
(MHz)
0.150 – 500
0.100 – 350
0.040 – 300
0.050 – 325
0.080 – 700
0.080 – 225
0.100 – 125
0.125 – 125
0.050 – 100
0.100 – 45
0.100 – 375
0.050 – 200
0.070 – 400
0.050 – 125
0.040 – 500
0.100 – 500
0.050 – 200
0.050 – 400
0.150 – 400
0.150 – 125
0.050 – 100
0.040 – 200
0.040 – 350
0.050 – 100
0.040 – 150
0.040 – 350
0.100 – 100
0.100 – 65
1. When ordering, please specify
packaging
code:
WB25-1LSD
Packaging: D
= 13″ machine-ready reel. EIA-481 embossed plastic
tape (500 parts per full reel).
B
= Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge),
use code letter D instead.
2. Inductance measured at 100 kHz, 0.1 V, 0 Adc on an Agilent/
HP 4192 or equivalent.
3. DCR measured on a micro-ohmmeter.
4. DC imbalance is the maximum difference in current measured at pins
1 and 3 with the source at pin 2. Inductance drop is 15% at maximum
imbalance.
5. Operating temperature range -40°C to +85°C.
6. Electrical specifications at 25°C.
Specifications subject to change without notice.
Document 425-1
Revised 11/03/05
© Coilcraft, Inc. 2005
Document 425-2
Wideband Transformers
Dimensions – surface mount parts
0.325 max
8,26
0.225 max
5,72
0.100
typ
2,54
0.004 /0,10
0.025max
0,64
Dot indicates
pin 1
0.285 max
7,24
Dimensions – through hole parts
0.325 max
8,26
Dot indicates
pin 1
0.225 max
5,72
0.120
min
3,05
0.100
typ
2,54
0.010 × 0.020 typ
0,25 × 0,51
0.285 max
7,24
0.400
typ
10,16
0.520 ±0.010
13,21 ±0,25
90
°
-105
°
0.300 ±0.010
7,62 ±0,25
0.06
1,52
1
2
3
0.40
10,2
0.520
13,2
0.10
2,5
0.10
2,5
6
5
4
0.30
7,6
0.100
2,54
0.100
2,54
1
2
3
6
5
4
0.03
0,76
Recommended
Land Pattern
Terminations:
Nickel/tin
Packaged 54 per tube.
0.025 dia typ
0,64
Recommended
Board Layout
Terminations:
Nickel/tin
Tape and reel:
500/13″ reel 24 mm tape width
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Document 425-2
Revised 12/29/05
© Coilcraft, Inc. 2005
Document 425-3
Transformers with no center taps
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1-1
3 dB bandwidth: 0.150 – 500 MHz
Frequency (MHz)
WB2.5-6
3 dB bandwidth: 0.080 – 225 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1-6
3 dB bandwidth: 0.100 – 350 MHz
Frequency (MHz)
WB4-6
3 dB bandwidth: 0.100 – 125 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1.18-3
3 dB bandwidth: 0.040 – 300 MHz
Frequency (MHz)
WB9-1
3 dB bandwidth: 0.125 – 125 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1.5-6
3 dB bandwidth: 0.050 – 325 MHz
Frequency (MHz)
WB16-1
3 dB bandwidth: 0.150 – 100 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB2-1-2W
3 dB bandwidth: 0.080 – 700 MHz
Frequency (MHz)
WB36-1
3 dB bandwidth: 0.100 – 45 MHz
Frequency (MHz)
Specifications subject to change without notice.
Document 425-3
Revised 11/03/05
© Coilcraft, Inc. 2005
Document 425-4
Transformers with secondary center tap
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1-1T
3 dB bandwidth: 0.100 – 375 MHz
Frequency (MHz)
WB4-6T
3 dB bandwidth: 0.050 – 200 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB1-6T
3 dB bandwidth: 0.050 – 200 MHz
Frequency (MHz)
WB5-1T
3 dB bandwidth: 0.050 – 400 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB2-1T
3 dB bandwidth: 0.070 – 400 MHz
Frequency (MHz)
WB8-1T
3 dB bandwidth: 0.150 – 400 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB2.5-6T
3 dB bandwidth: 0.050 – 125 MHz
Frequency (MHz)
WB13-1T
3 dB bandwidth: 0.150 – 125 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB3-1T
3 dB bandwidth: 0.040 – 500 MHz
Frequency (MHz)
WB16-6T
3 dB bandwidth: 0.050 – 100 MHz
Frequency (MHz)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WB4-1H
3 dB bandwidth: 0.100 – 500 MHz
Frequency (MHz)
Specifications subject to change without notice.
Document 425-4
Revised 11/03/05
© Coilcraft, Inc. 2005
Document 425-5
Transformers with primary and secondary center taps
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WBT1-6
3 dB bandwidth: 0.040 – 200 MHz
Frequency (MHz)
WBT4-1A
3 dB bandwidth: 0.040 – 350 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WBT1.5-1
3 dB bandwidth: 0.040 – 350 MHz
Frequency (MHz)
WBT16-1
3 dB bandwidth: 0.100 – 100 MHz
Frequency (MHz)
Attenuation (dB)
1
2
3
4
5
0.01
0.1
1
10
100
1000
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WBT2.5-6
3 dB bandwidth: 0.050 – 100 MHz
Frequency (MHz)
WBT25-1
3 dB bandwidth: 0.100 – 65 MHz
Frequency (MHz)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
1
10
100
1000
WBT4-1
3 dB bandwidth: 0.050 – 150 MHz
Frequency (MHz)
Specifications subject to change without notice.
Document 425-5
Revised 11/03/05
© Coilcraft, Inc. 2005
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