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.
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***
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. * 50Ω reference to ground
Outline Drawing
3A512 Rev A Mechanical Outline
Dimensions are in Inches [Millimeters]
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
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
Model 3A512
Rev. A
Typical Performance: 1200 MHz. to 1800 MHz.
Amplitude Balance 3A512
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
1200 1300 1400 1500 1600 1700 1800
Frequency [MHz]
Amplitude Balance [dB]
Return Loss 3A512
-50
-40
-30
-20
-10
0
1200 1300 1400 1500 1600 1700 1800
Frequency [MHz]
Return Loss [dB]
Insertion Loss 3A512
-0.5
-0.4
-0.3
-0.2
-0.1
0
1200 1300 1400 1500 1600 1700 1800
Frequency [MHz]
Insertion Loss [dB]
Phase Balance 3A512
-190
-185
-180
-175
-170
1200 1300 1400 1500 1600 1700 1800
Frequency [MHz]
Phase Balance [Degrees]
Pin Configuration: Mounting Configuration:
Dimensions are in Inches [Millimeters]
3A512 Rev A Mounting Footprint
50 Transmission Line
.221 [5.62]
.030 TYP
[0.76]
.070
[1.78]
.115 [2.92]
.450
[11.43]
.030
[0.76]
.075 [1.90]
.075 [1.90]
.080 [2.03]
2 Places
12.5 Transmission Line
Referenced to GND
.340 [8.64] .050 [1.27]
Multiple
plated thru holes
to ground
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
.034 [0.86]
