Model 3A325
Rev. B
Xinger Balun
50Ω to 25Ω Balanced
Description
The 3A325 is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package for NMT450 and TV
broadcast applications. These compact Xinger® surface mount baluns are ideal for
high volume manufacturing and are more reliable and repeatable than traditional
baluns. The 3A325 has an unbalanced port impedance of 50Ω and balanced port
impedances of 25Ω to ground with a 50Ω 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 3A325 is available on tape and reel for pick and place high volume
manufacturing.
ELECTRICAL SPECIFICATIONS***
Features:
• 470 – 860 MHz
Unbalanced
Port
Balanced
Port
Return
Loss
Insertion
Loss**
Frequency
Impedance
Impedance*
• 180° Transformer
• 50 Ohm to 25 Ohm
• Broad Band
MHz
Ohms
Ohms
dB min
dB max
470 - 860
50
25
10
0.65
• Low Insertion Loss
• High Power
• Even Order Harmonic
Suppression
Amplitude
Balance
Phase
Balance
Power
Handling
Operating
Temp.
ΘJC
• Input to Output DC Isolation
• Surface Mountable
• Tape & Reel
dB max
Degrees max
Watts
ºC / Watt
ºC
0.5
180+ 5.0
275
4.4
-55 to +85
• Convenient Package
***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 reflected power. *25Ω reference to ground
Outline Drawing
Top View (Near-side)
Side View
Botttom View (Far-side)
±.008
±0.20
±.004
.076
[1.93
.023
±.010
.750
±0.10
]
[0.58
]
±.008
±0.20
±0.25
.064
[1.63
[19.05
]
Pin 2
Pin 2
]
Pin 1
±.004
.023
±0.10
[0.58
]
±.004
.129
±0.10
[3.28
]
±.010
.870
Pin 1
GND
±0.25
[22.10
]
GND
±.008
.450
±0.20
[11.44
]
±.008
.134
±0.20
[3.40
]
Denotes
Array Number
Pin 3
±.004
.027
[0.69
TYP
]
Pin 3
±0.10
±.008
.044
±0.20
[1.12
]
ches [Millimeters]
Dimensions are in In
cal Outline
3A325 Rev A Mechani
USA/Canada:
Toll Free:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape
and Reel For Pick and
Place Manufacturing.
Europe:
ANAREN [ ANAREN MICROWAVE ]
