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
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***
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
ΘJC
Operating
Temp.
dB max Degrees max Watts ºC / Watt ºC
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 Ω nominal impedance. Specifications subject to change without notice.
**Insertion Loss excludes reflected power. * 25Ω 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]
Amplitude Balance [dB]
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]
Return Loss [dB]
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]
Insertion Loss [dB]
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]
Phase Balance [Degrees]
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
