Document 424 -1
SMT Mini Wideband Transformers
• Smallest wideband transformer: 4 mm square 3 mm high
• 300 V interwinding isolation, 1/4 Watt RF input power
• 250 mA max current rating.
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
Impedance
Part
ratio
2
1
number
Schematic
pri : sec
WBC1-1L_
A
1
:
1
WBC1-1TL_
B
1
:
1
WBC2-1TL_
B
1
:
2
WBC3-1TL_
B
1
:
3
WBC4-1TL_
B
1
:
4
WBC4-14L_
B
1
:
4
WBC4-1WL_
B
1
:
4
WBC4-6TL_
B
1
:
4
WBC8-1L_
B
1
:
8
WBC9-1L_
B
1
:
9
WBC16-1TL_
B
1
:
16
WBC4-4L_
C
1
:
4
Insertion
Bandwidth loss max
(MHz)
(dB)
0.400 – 600
0.40
0.250 – 750
0.58
0.200 – 500
0.50
0.300 – 900
0.60
0.250 – 750
1.0
1.500 – 1200
2.0
0.500 – 1000
0.90
0.300 – 700
0.65
0.150 – 600
0.60
0.300 – 500
0.54
0.600 – 300
0.80
0.250 – 800
1.0
Pins 4 – 6 (primary)
L min
3
DCR max
4
(µH)
(mOhm)
10
120
11
75
10
120
9
100
12
55
2
50
5
60
9
80
22
120
9
80
5
60
12
60
Pins 1 – 3 (secondary)
DC
L min
3
DCR max
4
imbalance
5
(µH)
(mOhm)
max (mA)
10
120
—
11
75
36
20
150
8.5
27
150
8.5
48
120
30
8
100
15
20
120
10
36
200
7.5
176
310
17
81
230
5
80
230
5
48
120
30
Color
dot
Brown
Brown
Red
Orange
Yellow
Green
White
Blue
Gray
White
Violet
Yellow
1. When ordering, please specify
termination
and
packaging
codes:
WBC4-4LC
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
A
Pri
4
3
1
2 Sec
4
3
1
2 Sec
3
6
1
Sec
B
Pri
6
C
6
Pri 5
4
Specifications subject to change without notice.
Please check our website for latest information.
Document 424-1
Revised 02/17/09
© Coilcraft, Inc. 2009
Document 424-3
SMT Mini Wideband Transformers
Attenuation (dB)
1
2
3
4
5
0.01
0.1
Attenuation (dB)
0
0
1
2
3
4
5
0.01
0.1
WBC1-1
3 dB bandwidth: 0.400 – 600 MHz
1
10
100
1000
10000
WBC4-1W
3 dB bandwidth: 0.500 – 1000 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation (dB)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
0
1
2
3
4
5
0.01
0.1
Frequency (MHz)
WBC1-1T
3 dB bandwidth: 0.250 – 750 MHz
1
10
100
1000
10000
WBC4-6T
3 dB bandwidth: 0.300 – 700 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation (dB)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
0
1
2
3
4
5
0.01
0.1
Frequency (MHz)
WBC2-1T
3 dB bandwidth: 0.200 – 500 MHz
1
10
100
1000
10000
WBC8-1
3 dB bandwidth: 0.150 – 600 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation (dB)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
0
1
2
3
4
5
0.01
0.1
Frequency (MHz)
WBC3-1T
3 dB bandwidth: 0.300 – 900 MHz
1
10
100
1000
10000
WBC9-1
3 dB bandwidth: 0.300 – 500 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation (dB)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
0
1
2
3
4
5
0.01
0.1
Frequency (MHz)
WBC4-1T
3 dB bandwidth: 0.250 – 750 MHz
1
10
100
1000
10000
WBC16-1T
3 dB bandwidth: 0.600 – 300 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation (dB)
Attenuation (dB)
0
1
2
3
4
5
0.01
0.1
1
0
1
2
3
4
5
0.01
0.1
Frequency (MHz)
WBC4-14
3 dB bandwidth: 1.500 – 1200 MHz
10
100
1000
10000
WBC4-4
3 dB bandwidth: 0.250 – 800 MHz
1
10
100
1000
10000
Frequency (MHz)
Attenuation measured on a network analyzer (re: 50 Ohms)
Specifications subject to change without notice.
Please check our website for latest information.
Frequency (MHz)
Document 424-3
Revised 02/17/09
© Coilcraft, Inc. 2009
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