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 3A412
Rev. A
Balun Transformers
50 to 12.5 Balanced
Description
The 3A412 is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package for AMPS and GSM. These
compact Xinger
surface mount baluns are ideal for high volume manufacturing and
are more reliable and repeatable than traditional baluns. The 3A412 has an
unbalanced port impedance of 50
and balanced port impedances of 12.5 to
ground with a 25
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 3A412 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
MHz
Ohms
Ohms
dB min
dB max
800 1000
50
12.5+j
15
0.35
Amplitude
Balance
Phase
Balance
Power
Handling
JC
Operating
Temp.
dB max
Degrees max
Watts
C / Watt
C
Features:
800 1000 MHz
180 Transformer
50 Ohm to 2 x 12.5+j 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
3.8
-55 to +85
***Specification based on performance of unit properly installed on microstrip printed circuit
boards with 50
nominal impedance. Specifications subject to change without notice.
**Insertion loss specification excludes reflected power. * 12.5
reference to ground
Outline Drawing
3A412 Rev A Mechanical Outline
Dimensions are in Inches [Millimeters]
Top View (Near-side)
Bottom View (Far-side)
.075
.008
[1.91
0.20
]
Side View
Pin 1
Denotes
Array Number
1.000
.010
[25.40
0.25
]
.750
.010
[19.05
0.25
]
Pin 2
Pin 3
GND
.115
.004
[2.92
0.10
]
Pin 1
GND
.050
.008
[1.27
0.20
]
.030
.004
TYP
[0.76
0.10
]
.400
.004
[10.16
0.10
]
.070
.008
[1.78
0.20
]
.060
.004
[1.52
0.10
]
.050
.008
[1.27
0.20
]
.030
.004
[0.76
0.10
]
Pin 3
Pin 2
.358
.008
[9.09
0.20
]
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 3A412
Rev. A
Typical Performance: 700 MHz. to 1100 MHz.
Amplitude Balance 3A412
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
700
800
900
1000
1100
Frequency [MHz]
A
m
pl
i
t
ude
B
a
l
a
n
c
e
[
d
B
]
Return Loss 3A412
-40
-30
-20
-10
0
700
800
900
1000
1100
Frequency [MHz]
R
e
tu
r
n
L
o
s
s
[
d
B
]
Insertion Loss 3A412
-0.5
-0.4
-0.3
-0.2
-0.1
0
700
800
900
1000
1100
Frequency [MHz]
I
n
s
e
r
t
i
on Los
s
[
d
B
]
Phase Balance 3A412
-190
-185
-180
-175
-170
700
800
900
1000
1100
Frequency [MHz]
P
h
a
s
e B
a
l
a
nc
e
[
D
eg
r
e
e
s
]
Pin Configuration Mounting
Configuration
Dimensions are in Inches [Millimeters]
3A412 Rev A Mounting Footprint
.291 [7.40]
.030 TYP
[0.76]
.070
[1.78]
.115 [2.92]
.650
[16.51]
.080 [2.03]
2 Places
12.5 Transmission Line
Referenced to GND
.410 [10.41]
.050 [1.27]
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
.034 [0.86]
.080 [2.03]
.030
[0.76]
50 Transmission Line
Multiple
plated thru holes
to ground
.075 [1.90]
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