ANAREN 3A325

Model 3A325
Rev. B
Xinger Balun
50Ω to 25Ω Balanced
Description
The 3A325 is a low profile balanced to unbalanced transformer designed for pushpull 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
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
Frequency
Unbalanced
Port
Impedance
Balanced
Port
Impedance*
Return
Loss
Insertion
Loss**
MHz
Ohms
Ohms
dB min
dB max
470 - 860
50
25
10
0.65
Amplitude
Balance
Phase
Balance
Power
Handling
ΘJC
dB max
Degrees max
Watts
ºC / Watt
ºC
0.5
180+ 5.0
275
4.4
-55 to +85
Operating
Temp.
***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)
Botttom View (Far-side)
Side View
.076±.008
[1.93±0.20]
.750±.010
[19.05±0.25]
Pin 2
.023±.004
[0.58±0.10]
.064±.008
[1.63±0.20]
Pin 2
Pin 1
.870±.010
[22.10±0.25]
Pin 1
.023±.004
[0.58±0.10]
.129±.004 [3.28±0.10]
GND
.450±.008 [11.44±0.20]
GND
.134±.008 [3.40±0.20]
Denotes
Array Number
Pin 3
.027±.004 TYP
[0.69±0.10]
Pin 3
.044±.008
[1.12±0.20]
Dimensions are in Inches [Millimeters]
3A325 Rev A Mechanical Outline
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 3A325
Rev. B
Typical Performance: 300 MHz to 1000 MHz
Amplitude Balance 3A325
Return Loss 3A325
1
0
0.8
-5
-10
0.4
R eturn Loss [dB ]
Am plitude Balance [dB]
0.6
0.2
0
-0.2
-0.4
-15
-20
-25
-30
-0.6
-35
-0.8
-1
300
400
500
600
700
800
900
-40
300
1000
400
500
600
-0.05
-172
-0.1
-174
-0.15
-0.2
-0.25
-0.3
-0.35
900
1000
-182
-184
-188
700
800
-180
-186
600
1000
-178
-0.45
500
900
-176
-0.4
400
800
Phase Balance 3A325
-170
Phase Balance [deg]
Insertion Loss [dB]
Insertion Loss 3A325
0
-0.5
300
700
Frequency [MHz]
Frequency [MHz]
800
900
1000
-190
300
400
500
Frequency [MHz]
600
700
Frequency [MHz]
Pin Configuration:
Mounting Configuration:
To ensure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
.121
[3.07]
Multiple
plated thru holes
to ground
.069
[1.77]
.325 [8.25]
.650
[16.52]
.610 [15.50]
.130 [3.30]
.049
[1.24]
.034 TYP
[0.86]
Dimensions are in Inches [Millimeters]
3A325 Rev A Mounting Footprint
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
50
Transmission
Line