Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Model 3A512
Rev.
Balun
50Ω to 12.5Ω Balanced
Description
The 3A512 is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package for Japanese PDC push-
pull amplifier and mixer applications. These compact Xinger
surface mount baluns
are ideal for high volume manufacturing and are more reliable and repeatable than
traditional baluns. The 3A512 has an unbalanced port impedance of 50Ω and
balanced port impedances of 12.5Ω to ground with a 25Ω balance between outputs.
This eases the matching of the push-pull amplifier’s power transistors, which have
low impedance levels. The output ports have equal amplitude (-3dB) with 180
degree phase differential. The Xinger
balun is a result of years of research and
development culminating with a solution so unique, a patent is pending on the
design approach. The 3A512 is available on tape and reel for pick and place high
volume manufacturing.
ELECTRICAL SPECIFICATIONS***
Frequency
Unbalanced
Port
Impedance
Balanced
Port
Impedance*
Return
Loss
Insertion
Loss**
GHz Ohms Ohms dB Min dB max
1.4 – 1.6 50 12.5+j3.5 15 0.30
Amplitude
Balance
Phase
Balance
Power
Handling
ΘJC
Operating
Temp.
dB max Degrees max Watts ºC / Watt ºC
Features:
• 1.4 – 1.6 GHz
• 180° Transformer
• 50 Ohm to 2 x 12.5 + j3.5 Ohm
• Low Insertion Loss
• High Power
• Even Order Suppression
• Input to Output DC Isolation
• Surface Mountable
• Tape & Reel
• Convenient Package
0.40 180+ 5.0 250 5.8 -55 to +85
***Specification based on performance of unit properly installed on microstrip printed circuit
boards with 50 Ω nominal impedance. Specifications subject to change without notice.
**Insertion loss specification excludes reflection loss. * 50
Ω reference to ground
Outline Drawing
3
A
5
1
2
R
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A
M
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D
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I
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[
M
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]
Side View
.075
±.008
[1.91
±0.20
]
.750
±.010
[19.05
±0.25
]
.550
±.010
[13.97
±0.25
]
Pin 2 Pin 3
Pin 1
Top View (Near-side) Bottom View (Far-side)
Denotes
Array Number
GND
Pin 2
Pin 3
Pin 1
.232
±.008
[5.91
±0.20
]
.112
±.004
[2.86
±0.10
]
.030
±.004
TYP
[0.76
±0.10
]
.100
±.004
[2.54
±0.10
]
.050
±.008
[1.27
±0.20
]
.030
±.004
[0.76
±0.10
]
.035
±.008
[0.89
±0.20
]
.290
±.004
[7.37
±0.10
]
.050
±.008
[1.27
±0.20
]
GND
