© Coilcraft, Inc. 2009
Specifications subject to change without notice.
Please check our website for latest information.
SMTMiniWidebandTransformers
Document 424 -1
Document 424-1
Revised 02/17/09
Impedance
Insertion
Pins 4 – 6 (primary)
Pins 1 – 3 (secondary)
DC
Part
ratio2
Bandwidth
loss max
L min3
DCR max4
L min3
DCR max4
imbalance5
Color
number1
Schematic
pri : sec
(MHz)
(dB)
(µH)
(mOhm)
(µH)
(mOhm)
max (mA)
dot
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
11
75
11
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
12
55
48
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
60
20
120
10
White
WBC4-6TL_
B
1 : 4
0.300 – 700
0.65
9
80
36
200
7.5
Blue
WBC8-1L_
B
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
60
80
230
5
Violet
WBC4-4L_
C
1 : 4
0.250 – 800
1.0
12
60
48
120
30
Yellow
6
4
3
1
Pri
Sec
6
4
3
2
1
Pri
Sec
6
5
4
3
2
1
Pri
Sec
A
B
C
1. When ordering, please specify termination and packaging codes:
WBC4-4
LC
Termination: L = RoHS compliant tin-silver-copper (95.5/4/0.5) over
silver-palladium-platinum
Special order: 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
″ machine-ready reel. EIA-481 embossed plastic
tape. Factory order only, not stocked (3000 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 on a micro-ohmmeter.
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. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Schematics
Designer’s Kit C393 contains three of each part
Core material Ferrite
Terminations RoHS compliant tin-silver-copper over silver-
platinum-glass frit. Other terminations available at additional cost.
Weight 68.0 – 88.8 mg
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
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)
60 per billion hours / 16,666,667 hours, calculated per Telcordia SR-332
Packaging 750/7
″reel; 3000/13″ reel Plastic tape: 12 mm wide,
0.3 mm thick, 8 mm pocket spacing, 2.9 mm pocket depth
PCB washing Only pure water or alcohol recommended
• Smallest wideband transformer: 4 mm square 3 mm high
• 300 V interwinding isolation, 1/4 Watt RF input power
• 250 mA max current rating.
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