3A412S Datasheet, PDF (1/2 Pages) Anaren Microwave – Balun Transformers 50 to 12.5 Balanced

Model 3A412S
Rev A
Balun Transformers
50 to 12.5 Balanced
Features:
• 800 – 1000 MHz
• 180° Transformer
• 50 Ohm to 2 x 12.5+j Ohm
• Low Insertion Loss
• High Power
• Even Order Suppression
• Input to Output DC Isolation
• Surface Mountable
• Tape & Reel
• Convenient Package
• Lead Free
Outline Drawing
Description
The 3A412S is a low profile balanced to unbalanced transformer designed for push-
pull amplifiers in an easy to use surface mount package for AMPS and GSM. These
compact Xinger® surface mount baluns are ideal for high volume manufacturing
and are more reliable and repeatable than traditional baluns. The 3A412S has an
unbalanced port impedance of 50Ω and balanced port impedances of 12.5Ω to
ground with a 25Ω 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 3A412S is available on
tape and reel for pick and place high volume manufacturing.
ELECTRICAL SPECIFICATIONS***
Frequency
Unbalanced
Port
Impedance
Balanced
Port
Impedance*
MHz
Ohms
Ohms
Return
Loss
dB min
Insertion
Loss
dB max
800-1000
50
12.5+j
15
0.48
869-894
50
12.5+j
15
0.35
925-960
50
12.5+j
15
0.40
Amplitude
Balance
Phase
Balance
Power
Handling
ΘJC
Operating
Temp.
dB max
Degrees max
Watts
ºC / Watt
ºC
0.40
180± 5.0
250
3.8
-55 to +85
0.40
180± 5.0
250
3.8
-55 to +85
0.40
180± 5.0
250
3.8
-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. * 12.5Ω reference to ground
Pin 2
Top View (Near-side)
Side View
1.000±.010
[25.40±0.25]
.075±.008
[1.91±0.20]
Pin 3
Bottom View (Far-side)
.060±.004 [1.52±0.10]
Pin 3
.400±.004 [10.16±0.10]
.070±.008 [1.78±0.20]
Pin 2
GND
.750±.010
[19.05±0.25]
.050±.008
[1.27±0.20]
.030±.004
[0.76±0.10]
.030±.004 TYP
[0.76±0.10]
.050±.008
[1.27±0.20]
Pin 1
Denotes
Array Number
Dimensions are in Inches [Millimeters]
3A412S Mechanical Outline
GND
Pin 1
.115±.004 [2.92±0.10]
.358±.008 [9.09±0.20]
Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe:
[phone]
[phone]
[phone]