Model 3A525
Rev. A
Balun Transformers
50Ω to 25Ω 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 50Ω and a balanced port impedances of 25Ω to
ground with 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 (-3 dB) with 180° phase differential.
The 3A525 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
• 1.5 – 1.9 GHz
Impedance
Ohms
Impedance*
Ohms
• 180° Transformer
• 50 Ohm to 2 x 25 Ohm
• Low Insertion Loss
• High Power
GHz
dB min
dB max
1.5 – 1.9
50
25
15
0.35
Amplitude
Balance
Phase
Power
Operating
Temp.
ΘJC
• Input to Output DC Isolation
• Surface Mountable
• Tape & Reel
Balance
Handling
dB max
Degrees max
Watts
ºC / Watt
7.2
ºC
• Convenient Package
0.40
150
-55 to +85
180± 5.0
***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
±0.10
.027
[0.69
]
±.008
±0.20
.076
±.010
±.008
±0.20
.480
.062
[1.93
]
±0.25
[12.19
]
[1.56
]
Pin 2
Pin 2
Pin 1
±.004
.027
±.004
±0.10
±0.20
.121
.339
[3.07
[8.62
]
±.010
.650
±0.10
[0.69
]
Pin 1
GND
±0.25
[16.51
]
GND
±.008
]
±.008
±0.20
.130
[3.30
]
Denotes
Pin 3
±.004
.035
TYP
Pin 3
Array Number
±0.10
[0.89
]
±.008
±0.20
.038
[0.98
]
[Millimeters]
Dimensions are in Inches
anical Outline
3A525 Rev A Mech
USA/Canada:
Toll Free:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape
and Reel For Pick and
Place Manufacturing.
Europe: