Model 3W525S
Rev. A
Balun Transformers
50Ω to 25Ω Balanced
Description
The 3W525S is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package for PCS and DCS
applications. These compact Xinger
surface mount baluns are ideal for high
volume manufacturing and are more reliable and repeatable than traditional baluns.
The 3W525S 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 3W525S is available on tape and reel for pick and place high volume
manufacturing.
ELECTRICAL SPECIFICATIONS***
Unbalanced
Port
Balanced
Port
Features:
Return
Loss
Insertion
Loss**
Frequency
• 1.8 – 2.5 GHz
Impedance
Ohms
Impedance*
Ohms
• 180° Transformer
• 50 Ohm to 2 x 25 Ohm
• Low Insertion Loss
• High Power
GHz
dB min
15
dB max
0.38
1.8 – 2.5
1.805-2.170
50
50
25
25
15
0.35
• Even Order Suppression
• Input to Output DC Isolation
• Surface Mountable
• Tape & Reel
• Convenient Package
• Lead Free
Amplitude
Balance
Phase
Power
Operating
Temp.
ΘJC
Balance
Handling
dB max
0.40
Degrees max
180± 5.0
180± 5.0
Watts
150
ºC / Watt
11.3
ºC
-55 to +85
0.40
150
11.3
-55 to +85
***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 excludes reflected power. * 25Ω reference to ground
Outline Drawing
Top View (Near-side)
Side View
Bottom View (Far-side)
±.004
.027
±0.10
[0.69
]
±.008
±0.20
.076
[1.93
±.010
±0.25
±.008
±0.20
.480
[12.19
.062
[1.56
]
]
]
Pin 2
Pin 2
Pin 1
±.004
.027
±.004
±0.10
±0.20
.121
[3.07
]
]
±.010
.650
±0.10
[0.69
]
Pin 1
GND
±0.25
[16.51
]
GND
±.008
.339
[8.62
±.008
.130
±0.20
[3.30
]
Denotes
Array Number
Pin 3
±.004
.035
[0.89
TYP
]
Pin 3
±0.10
±.008
±0.20
.038
[0.98
]
eters]
Dimensions are in Inches [Millim
3W525S Mechanical Outline
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape
and Reel For Pick and
Place Manufacturing.
