Model 3A512
Rev. A
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***
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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
Frequency
GHz
Unbalanced
Port
Impedance
Ohms
Balanced
Port
Impedance*
Ohms
Return
Loss
dB Min
Insertion
Loss**
dB max
1.4 – 1.6
Amplitude
Balance
dB max
50
Phase
Balance
Degrees max
12.5+j3.5
Power
Handling
Watts
15
ΘJC
ºC / Watt
0.30
Operating
Temp.
ºC
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
Top View (Near-side)
.075
±.008
[1.91
±0.20
]
Pin 3
.050
±.008
[1.27
±0.20
]
.030
±.004
[0.76
±0.10
]
GND
Pin 1
Side View
.100
±.004
Bottom View (Far-side)
[2.54
±0.10
]
.290
±.004
[7.37
±0.10
]
.035
±.008
[0.89
±0.20
]
Pin 2
.030
±.004
TYP
[0.76
±0.10
]
.050
±.008
[1.27
±0.20
]
Pin 2
.750
±.010
[19.05
±0.25
]
Pin 3
.550
±.010
[13.97
±0.25
]
GND
Pin 1
Denotes
Array Number
.232
±.008
[5.91
±0.20
]
.112
±.004
[2.86
±0.10
]
Dimensions are in Inches [Millimeters]
3A512 Rev A Mechanical Outline
Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
ANAREN [ ANAREN MICROWAVE ]
