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. D
Xinger Balun
50Ω to 25Ω 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 manufacturin g and are more reliab le 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 bet ween 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 25 15 0.35
Amplitude
Balance
Phase
Balance
Power
Handling
JC
Operating
Temp.
dB max Degrees max Watts ºC / Watt ºC
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
0.4 180+ 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
3A425 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
Bottom View (Far-side)
Side View
Model 3A425
Rev. D
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
Typical Performance: 600 MHz. to 1200 MHz.
Ampl it ude Bal ance 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]
Amplitude Ba lance [dB]
Retu rn Loss 3A425
-40
-35
-30
-25
-20
-15
-10
-5
0
600 700 800 900 1000 1100 1200
Frequen cy [MHz]
Return Loss [dB]
In sert ion 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]
Ins ertion Loss [dB ]
Ph ase Bal ance 3A425
-190
-188
-186
-184
-182
-180
-178
-176
-174
-172
-170
600 700 800 900 1000 1100 1200
Frequency [MHz]
P hase Balanc e [D e grees]
Pin Configuration: Mounting Configuration:
Dimensions are in Inches [Millimeters]
3A425 Rev A Mounting Footprint
To ensure proper electr ical and thermal performa nce
there must be a ground pla ne with 100%
solder connecti on underneath the part
.121 [3.07]
50 Transmission Line
.070
[1.78]
.651
[16.54]
.049
[1.24]
.034 TYP
[0.86] 2 Places
25 Transmission Line
Referenced to GND
.130 [3.30]
.531 [13.48]
.280 [7.11]
Multiple
plated thru holes
to ground
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. D
Packaging Information
Parts are available in a reel. Packagi ng follows EIA 481-2 for reels. Parts are orientated in tape and reel as shown below.
Minimum order quantity is 500 per reel.
SCALE 1.5:1
DETAIL "B"
SEE DETAIL "A"
SEE DETAIL "B"
DETAIL "A"
SCALE 2=1.5:1
Direction of
Part Feed
(Unloading)
