Document 117-1
Surface Mount Wideband RF Transformers
• Provides wide band pass performance in a small SMT package.
• 1812 size ferrite body with a ceramic base.
• 50 V isolation, 1/4 Watt RF input power
Core material
Ferrite
Terminations
RoHS compliant gold over nickel over moly-manganese.
Other terminations available at additional cost.
Weight
131 – 152 mg
Ambient temperature
–40°C to +85°C with
Irms
current
Storage temperature
Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat
Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)
1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
One per billion hours / one billion hours, calculated per Telcordia SR-332
Packaging
600/7″ reel; 2200/13″ reel Plastic tape: 12 mm wide,
0.3 mm thick, 8 mm pocket spacing, 3.7 mm pocket depth
PCB washing
Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See
Doc787_PCBt_Washing.pdf.
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
Inductance (µH)
2
Test freq. Imp. ratio
pri
sec
(MHz)
pri : sec
5.0
3.3
10
1.5 : 1
2.5
1.6
10
1.5 : 1
1.0
0.60
10
1.5 : 1
0.144
0.090
10
1.5 : 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
I
DC
(mA)
400
500
500
700
I
DC
(mA)
200
400
600
700
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
number1
1812WBT1.5-1L_
1812WBT1.5-2L_
1812WBT1.5-3L_
1812WBT1.5-4L_
Part
number
1
1812WBT2-1L_
1812WBT2-2L_
1812WBT2-3L_
1812WBT2-4L_
DCR max ()
pri
sec
1.05
0.87
0.74
0.58
0.43
0.34
0.18
0.14
DCR max ()
pri
sec
4.6
3.2
1.25
0.95
0.52
0.42
0.27
0.23
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
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
2:1 Transformers
Inductance (µH)
2
Test freq. Imp. ratio
pri
sec
(MHz)
pri : sec
13.80
6.90
10
2:1
5.850
2.925
10
2:1
2.60
1.30
10
2:1
0.910
0.455
50
2:1
1. When ordering, please specify
termination
and
packaging
codes:
1812WBT1.5-4LC
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. Electrical specifications at 25°C. Measurements are referenced to 50 Ohms.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 117E-1
Revised 07/21/17
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 117-2
Bottom View
0.150 max
3,81
4
1
1
4
0.070 ref
1,78
0.015
0,38
1
4
0.057
1,45
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
0.135
max
3,43
0.015
ref
0,38
0.040 ref
1,02
0.030 ±0.002
0,76 ±0,05
Color dot
over
pin 1
0.020
0,51
2
0.115
2,92
3
0.100 ±0.003
2,54 ±0,008
0.048
1,22
0.018
0,46
Recommended
Land Pattern
Dimensions are in
inches
mm
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
Measured on a network analyzer (re: 50 Ohms)
Frequency (MHz)
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 117-2
Revised 07/21/17
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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