Document 117-1
Surface Mount Wideband RF Transformers
Available in a variety of impedance versions, Coilcraft’s
WBT Series chip transformers provide wide band pass
performance in a small surface mount package.
The transformers are built on an 1812 size ferrite body
with a ceramic base. They feature 50 V isolation and a
1/4 Watt RF input power rating. The top is a high
temperature material that creates a flat surface for auto
insertion. The parts are packaged in tape and reel for
easy dispensing.
Applications include impedance matching, voltage or
current transformation, DC isolation, balanced/unbal-
anced mixing, matching, power splitting, coupling and
signal inversion.
To request free evaluation samples, contact Coilcraft or
visit
www.coilcraft.com.
1:1 Transformers
Part
number
1
1812WBT-1L_
1812WBT-2L_
1812WBT-3L_
1812WBT-4L_
1812WBT-5L_
Inductance
2
Test frequency Imp. ratio
(µH)
(MHz)
pri : sec
14
10
1:1
5.3
10
1:1
1.25
50
1:1
0.220
50
1:1
0.090
50
1:1
DCR max
(Ohms)
4.8
1.8
0.7
0.3
0.15
I
DC
(mA)
200
400
500
700
700
Isolation
(Vrms)
50
50
50
50
50
Insertion
loss (dB)
<1
<1
<1
<1
<1.5
Bandwidth Color
(MHz)
dot
0.340–22
Yellow
0.800–60
Green
4–200
White
11–480
Orange
48–645
Red
1.5:1 Transformers
Part
number
1
1812WBT1.5-1L_
1812WBT1.5-2L_
1812WBT1.5-3L_
1812WBT1.5-4L_
Inductance (µH)
2
pri
sec
5.0
3.3
2.5
1.6
1.0
0.6
0.144
0.090
Test freq.
(MHz)
10
10
10
10
Imp. ratio
pri : sec
1.5 : 1
1.5 : 1
1.5 : 1
1.5 : 1
DCR max ( )
pri
sec
1.05
0.87
0.74
0.58
0.43
0.34
0.18
0.14
I
DC
(mA)
400
500
500
700
Isolation Insertion Bandwidth Color
(Vrms) loss (dB)
(MHz)
dot
50
0.5
1.3–100
Red
50
0.5
2.75–135 Orange
50
0.75
7.2–200
Yellow
50
2.25
38–535
Green
2:1 Transformers
Part
number
1
1812WBT2-1L_
1812WBT2-2L_
1812WBT2-3L_
1812WBT2-4L_
Inductance (µH)
2
pri
sec
13.80
6.90
5.850
2.925
2.60
1.30
0.910
0.455
Test freq.
(MHz)
10
10
10
50
Imp. ratio
pri : sec
2:1
2:1
2:1
2:1
DCR max ( )
pri
sec
4.6
3.2
1.25
0.95
0.52
0.42
0.27
0.23
I
DC
(mA)
200
400
600
700
Isolation Insertion Bandwidth Color
(Vrms) loss (dB)
(MHz)
dot
50
<1.5
0.800–23 Brown
50
<1.5
2.2–65
Red
50
<1.5
4–105
Orange
50
<1.5
11–200
Yellow
1. When ordering, please specify
termination
and
packaging
codes:
1812WBT-1.5-4LC
Termination: L
= RoHS compliant gold over nickel over moly-manganese
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 (600 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 C instead.
D
= 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (2200 parts per full reel).
2. Inductance is per winding
3. Operating temperature range -40°C to +85°C.
4. Electrical specifications at 25°C.
Specifications subject to change without notice.
Please check our website for latest information.
Document 117-1
Revised 03/23/06
© Coilcraft, Inc. 2006
Document 117-2
0.150 max
3,81
4
1
0.135
max
3,43
0.070 ref
1,78
Recommended
Land Pattern
0.015
0,38
0.057
1,45
Top View
1
4
Pri
2
Sec
3
0.195 max
4,95
0.178 ±0.003
4,52 ±0,08
3
2
Pad
Detail
0.020
0,51
0.015
ref
0,38
Color dot
over
primary
0.020
0,51
0.115
2,92
0.100 ±0.003
2,54 ±0,008
0.040 min
1,02
0.030 ±0.002
0,76 ±0,05
0.048
1,22
0.018
0,46
Weight:
131 – 152 mg
Tape and reel:
600/7″ reel; 2200/13″ reel 12 mm tape width
For packaging data see Tape and Reel Specifications section.
Attenuation (dB, Re: 50 Ohms)
Typical Frequency Attenuation
1:1 Transformers
0
1
2
3
4
5
-1
6
7
8
0.1
1
10
100
1000
-2
-3
-4
-5
Frequency (MHz)
Attenuation (dB, Re: 50 Ohms)
Typical Frequency Attenuation
1.5:1 Transformers
0
1
2
3
4
5
-1
6
7
8
0.1
1
10
100
1000
-2
-3
-4
Frequency (MHz)
Attenuation (dB, Re: 50 Ohms)
Typical Frequency Attenuation
2:1 Transformers
0
1
2
3
4
5
-1
6
7
8
0.1
1
10
100
1000
-2
-3
-4
Frequency (MHz)
Specifications subject to change without notice.
Please check our website for latest information.
Document 117-2
Revised 01/26/05
© Coilcraft, Inc. 2006
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