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 3A425
Rev. A
Pico Balun
50? to 25? Balanced
Description
The 3A425 is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package covering GSM, D-AMPS
and NMT900 applications. These compact Xinger
surface mount baluns are ideal
for high volume manufacturing and are more reliable and repeatable than traditional
baluns. The 3A425 has an unbalanced port impedance of 50
and balanced port
impedances of 25
to ground with a 50
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 3A425 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
50
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 25 Ohm
Broad Band
Low Insertion Loss
High Power
Even Order Harmonic
Suppression
Input to Output DC Isolation
Surface Mountable
Tape & Reel
Convenient Package
0.5
180+ 5.0
250
5.3
-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 excludes reflected power. * 25
reference to ground
Outline Drawing
3A525 Rev A Mechanical Outline
Dimensions are in Inches [Millimeters]
.750
.010
[19.05
0.25
]
.790
.010
[20.07
0.25
]
Pin 1
Pin 2
Pin 3
GND
Denotes
Array Number
.076
.008
[1.93
0.20
]
Top View (Near-side)
.031
.004
TYP
[0.80
0.10
]
.060
.008
[1.52
0.20
]
.035
.004
TYP
[0.89
0.10
]
.401
.008
[10.19
0.20
]
.121
.004
[3.07
0.10
]
.040
.008
[1.02
0.20
]
.122
.008
[3.10
0.20
]
.027
.004
[0.69
0.10
]
Pin 2
Pin 3
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 3A425
Rev. A
Typical Performance: 600 MHz. to 1200 MHz.
Amplitude Balance 3A425
-1
-0.75
-0.5
-0.25
0
0.25
0.5
0.75
1
600
700
800
900
1000
1100
1200
Frequency [MHz]
Am
plitude Balance [dB]
Return Loss 3A425
-40
-35
-30
-25
-20
-15
-10
-5
0
600
700
800
900
1000
1100
1200
Frequency [MHz]
Re
turn Loss [dB]
Insertion Loss 3A425
-0.5
-0.45
-0.4
-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
600
700
800
900
1000
1100
1200
Frequency [MHz]
Insertion Loss [dB]
Phase Balance 3A425
-190
-188
-186
-184
-182
-180
-178
-176
-174
-172
-170
600
700
800
900
1000
1100
1200
Frequency [MHz]
Phase Balance [Degrees]
Pin Configuration:
Mounting Configuration:
Dimensions are in Inches [Millimeters]
3A425 Rev A Mounting Footprint
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
.121 [3.07]
50
V
Transmission Line
.070
[1.78]
.651
[16.54]
.049
[1.24]
.034 TYP
[0.86]
2 Places
25
V
Transmission Line
Referenced to GND
.130 [3.30]
.531 [13.48]
.280 [7.11]
Multiple
plated thru holes
to ground
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