 
Surface Mount
Wideband RF Transformers
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New RoHS part numbers are shown. The products were always compliant; only the part numbers changed. The second to the last character is now L
to indicate RoHS compliance.
(Old data sheet can be viewed here.)
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- The smallest RF transformers available
- Available in both 1:1, 1.5:1 and 2:1 versions
- 1812 size ferrite body with a ceramic base
- Jacketed with a high temp material that creates a flat top for
auto insertion
- Typical applications are as impedance
or isolation transformer
- Can also be used for balanced to unbalanced (balun)
conversion
- RoHS-compliant. 260°C compatible. Gold over nickel over moly-manganese
terminations.
Photo 
Pricing  Materials declaration 
PDF data sheet
SPECIFICATIONS
 Frequency Response curves -
1:1 transformers
1.5:1 transformers
2:1 transformers
 Dimensions 
Tape
and reel specifications
1:1 Transformers
|
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1812WBT-1L_ |
14 |
10 |
1:1 |
4.8 |
200 |
50 |
<1 |
0.340 - 22 |
Yellow |
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1812WBT-2L_ |
5.3 |
10 |
1:1 |
1.8 |
400 |
50 |
<1 |
0.800 - 60 |
Green |
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1812WBT-3L_ |
1.25 |
50 |
1:1 |
0.7 |
500 |
50 |
<1 |
4 - 200 |
White |
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1812WBT-4L_ |
0.220 |
50 |
1:1 |
0.3 |
700 |
50 |
<1 |
11 - 480 |
Orange |
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1812WBT-5L_ |
0.090 |
50 |
1:1 |
0.15 |
700 |
50 |
<1.5 |
48 - 645 |
Red |
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1.5:1 Transformers
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1812WBT1.5-1L_ |
5 |
3.3 |
10 |
1.5:1 |
1.05 |
0.87 |
400 |
50 |
<0.5 |
1.3 - 100 |
Red |
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1812WBT1.5-2L_ |
2.5 |
1.6 |
10 |
1.5:1 |
0.74 |
0.58 |
500 |
50 |
<0.5 |
2.75 - 135 |
Orange |
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1812WBT1.5-3L_ |
1 |
0.6 |
10 |
1.5:1 |
0.43 |
0.34 |
500 |
50 |
<0.75 |
7.2 - 200 |
Yellow |
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1812WBT1.5-4L_ |
0.144 |
0.090 |
10 |
1.5:1 |
0.18 |
0.14 |
700 |
50 |
<2.25 |
38 - 535 |
Green |
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2:1 Transformers
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1812WBT2-1L_ |
13.80 |
6.90 |
10 |
2:1 |
4.6 |
3.2 |
200 |
50 |
<1.5 |
0.800 - 23 |
Brown |
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1812WBT2-2L_ |
5.850 |
2.925 |
10 |
2:1 |
1.25 |
0.95 |
400 |
50 |
<1.5 |
2.2 - 65 |
Red |
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1812WBT2-3L_ |
2.60 |
1.30 |
10 |
2:1 |
0.52 |
0.42 |
600 |
50 |
<1.5 |
4 - 105 |
Orange |
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1812WBT2-4L_ |
0.910 |
0.455 |
50 |
2:1 |
0.27 |
0.23 |
700 |
50 |
<1.5 |
11 - 200 |
Yellow |
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1 |
When
ordering, please specify packaging code: e.g. 1812WBT1.5-4LC |
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Packaging: |
C = 7"
machine-ready reel
EIA-481 embossed plastic tape (600 parts per full reel).
B = Less than full reel
On reel but not machine-ready. To have a leader and trailer added ($25 charge), use code letter C instead.
D = 13" reel, machine-ready
EIA-481 embossed plastic tape. Factory order only, not stocked (2200
parts per full reel. |
| 2 |
Ambient temperature range: |
–40°C to +85°C |
| 3 |
Storage temperature range: |
Component: –40°C to +85°C
Packaging: –55°C to +80°C |
| 4 |
Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between. |
| 5 |
Electrical specifications at 25°C. |
| Refer to Soldering Coilcraft Components before soldering. |
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