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Designer's Kits

Surface Mount
Wideband RF Transformers

  • 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.

SPECIFICATIONS


1:1 Transformers

Part number1
Click for samples
L per
winding
(µH)
Test
freq
(MHz)
Imp.
ratio
pri:sec
DCR2
max
(Ohms)
IDC
(mA)
Isolation
(Vrms)
Insertion
loss (dB)
Bandwidth
(MHz)
Color
dot
1812WBT-1L_ 14 10 1:1 4.8 200 50 <1 0.340 – 22 Yellow
1812WBT-2L_ 5.3 10 1:1 1.8 400 50 <1 0.800 – 60 Green
1812WBT-3L_ 1.25 50 1:1 0.7 500 50 <1 4 – 200 White
1812WBT-4L_ 0.220 50 1:1 0.3 700 50 <1 11 – 480 Orange
1812WBT-5L_ 0.090 50 1:1 0.15 700 50 <1.5 48 – 645 Red

1.5:1 Transformers

Part number1
Click for samples
L per
winding (µH)
Test
freq
(MHz)
Imp.
ratio
pri:sec
DCR max2
(Ohms)
IDC
(mA)
Isolation
(Vrms)
Insertion
loss (dB)
Bandwidth
(MHz)
Color
dot
pri sec pri sec
1812WBT1.5-1L_ 5.0 3.3 10 1.5:1 1.05 0.87 400 50 <0.5 1.3 – 100 Red
1812WBT1.5-2L_ 2.5 1.6 10 1.5:1 0.74 0.58 500 50 <0.5 2.75 – 135 Orange
1812WBT1.5-3L_ 1.0 0.60 10 1.5:1 0.43 0.34 500 50 <0.75 7.2 – 200 Yellow
1812WBT1.5-4L_ 0.144 0.090 10 1.5:1 0.18 0.14 700 50 <2.25 38 – 535 Green

2:1 Transformers

Part number1
Click for samples
L per
winding (µH)
Test
freq
(MHz)
Imp.
ratio
pri:sec
DCR max2
(Ohms)
IDC
(mA)
Isolation
(Vrms)
Insertion
loss (dB)
Bandwidth
(MHz)
Color
dot
pri sec pri sec
1812WBT2-1L_ 13.80 6.90 10 2:1 4.6 3.2 200 50 <1.5 0.800 – 23 Brown
1812WBT2-2L_ 5.850 2.925 10 2:1 1.25 0.95 400 50 <1.5 2.2 – 65 Red
1812WBT2-3L_ 2.60 1.30 10 2:1 0.52 0.42 600 50 <1.5 4 – 105 Orange
1812WBT2-4L_ 0.910 0.455 50 2:1 0.27 0.23 700 50 <1.5 11 – 200 Yellow
1 When ordering, please specify packaging code: e.g. 1812WBT1.5-4LC
  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 DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
3 Ambient temperature range: −40°C to +85°C
4 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
5 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.
6 Electrical specifications at 25°C. Measurements are referenced to 50 Ohms.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info..

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Updated: October 30, 2017