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 3A525
Rev. A
Balun Transformers
50 to 25 Balanced
Description
The 3A525 is a low profile balanced to unbalanced transformer in an easy
to use surface mount package covering Japanese PDC, DCS and PCS
receive push-pull amplifier and mixer applications. The 3A525 has an
unbalanced impedance of 50
and a balanced port impedances of 25 to
ground with 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 (-3 dB) with 180
phase differential.
The 3A525 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**
GHz
Ohms
Ohms
dB min
dB max
1.5 1.9
50
25
15
0.35
Amplitude
Balance
Phase
Balance
Power
Handling
JC
Operating
Temp.
dB max
Degrees max
Watts
C / Watt
C
Features:
1.5 1.9 GHz
180 Transformer
50 Ohm to 2 x 25 Ohm
Low Insertion Loss
High Power
Input to Output DC Isolation
Surface Mountable
Tape & Reel
Convenient Package
0.40
180
5.0
150
7.2
-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]
.076
.008
[1.93
0.20
]
Side View
.480
.010
[12.19
0.25
]
.650
.010
[16.51
0.25
]
Pin 2
Pin 3
Pin 1
GND
Denotes
Array Number
Top View (Near-side)
.038
.008
[0.98
0.20
]
.035
.004
TYP
[0.89
0.10
]
GND
.130
.008
[3.30
0.20
]
Pin 3
.027
.004
[0.69
0.10
]
Pin 2
.339
.008
[8.62
0.20
]
.121
.004
[3.07
0.10
]
.062
.008
[1.56
0.20
]
.027
.004
[0.69
0.10
]
Bottom View (Far-side)
Pin 1
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 3A525
Rev. A
Typical Performance: 1200 MHz. to 2200 MHz.
Amplitude Balance 3A525
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
Frequency [MHz]
A
m
pli
t
ude
B
a
l
anc
e
[
d
B
]
Return Loss 3A525
-40
-35
-30
-25
-20
-15
-10
-5
0
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
Frequency [MHz]
R
e
tu
r
n
L
o
s
s
[d
B
]
Insertion Loss 3A525
-0.5
-0.45
-0.4
-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
Frequency [MHz]
I
n
s
e
r
t
io
n Lo
s
s
[
d
B
]
Phase Balance 3A525
-190
-188
-186
-184
-182
-180
-178
-176
-174
-172
-170
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
Frequency [MHz]
P
h
a
s
e B
a
l
anc
e
[
D
eg
r
e
es
]
Pin Configuration Mounting
Configuration
Dimensions are in Inches [Millimeters]
3A525 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]
.070
[1.78]
.380
[9.65]
.049
[1.24]
.130 [3.30]
.390 [9.91]
.210 [5.32]
Multiple
plated thru holes
to ground
.034 TYP
[0.86]
2 Places
25 Transmission Line
Referenced to GND
50 Transmission Line
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