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Application Notes
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Designer's Kits

WBC Series
SMT Mini Wideband Transformers

  • Tapped or untapped configurations
  • 250 mA max current rating
  • 300 Vrms interwinding isolation
  • 1/4 Watt RF input power rating
  • Custom versions available
  • Typical applications are as impedance or isolation transformer
  • Can also be used for balanced to unbalanced (balun) conversion
  • RoHS compliant. 260°C compatible. Tin-silver-copper over silver-platinum-glass frit terminations
  • Samples of all values are available in Coilcraft Designer's Kit C393

SPECIFICATIONS

A B C D

Part number1
Click for
samples
Sch Imp.
ratio2
pri : sec
Bandwidth
(MHz)
Insertion
loss max
(dB)
Primary Secondary DC imb5
max
(mA)
Color
dot
L min3
(µH)
DCR max4
(mOhm)
L min3
(µH)
DCR max4
(mOhm)
WBC1-1L_ A 1 : 1 0.400–600 0.40 10 120 10 120 Brown
WBC1-1TL_ B 1 : 1 0.250–750 0.58 9.5 75 9.5 75 36 Brown
WBC2-1TL_ B 1 : 2 0.200–500 0.50 10 120 20 150 8.5 Red
WBC3-1TL_ B 1 : 3 0.300–900 0.60 9 100 27 150 8.5 Orange
WBC4-1TL_ B 1 : 4 0.250–750 1.0 9 55 36 120 30 Yellow
WBC4-14L_ B 1 : 4 1.500–1200 2.0 2 50 8 100 15 Green
WBC4-1WL_ B 1 : 4 0.500–1000 0.90 5 80 20 120 10 White
WBC4-6TL_ B 1 : 4 0.300–700 0.65 9 80 36 200 7.5 Blue
WBC8-1L_ D 1 : 8 0.150–600 0.60 22 120 176 310 17 Gray
WBC9-1L_ B 1 : 9 0.300–500 0.54 9 80 81 230 5 White
WBC16-1TL_ B 1 : 16 0.600–300 0.80 5 80 80 230 5 Violet
WBC4-4L_ C 1 : 4 0.250–800 1.0 9 60 36 120 30 Yellow
1 When ordering, please specify termination and packaging codes: e.g. WBC16-1TLC
  Termination: L = RoHS compliant tin-silver-copper (95.5/4/0.5) over silver-palladium-platinum-glass frit
Special order, added cost: S = non-RoHS tin-lead (63/37).
  Packaging: C = 7" machine-ready reel
EIA-481 embossed plastic tape (750 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" reel, machine-ready 
EIA-481 embossed plastic tape. Factory order only, not stocked (2500 parts per full reel).
2 Impedance ratio is for the full primary winding to the full secondary winding.
3 Inductance measured at 100 kHz, 0.1 V, 0 Adc on an Agilent/ HP 4192 or equivalent.
4 DCR measured at 25°C on a micro-ohmmeter. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 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.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
8 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.
9 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: August 02, 2015