Model 3A512 Rev. A Balun 50Ω to 12.5Ω Balanced Description The 3A512 is a low profile balanced to unbalanced transformer designed for pushpull amplifiers in an easy to use surface mount package for Japanese PDC pushpull amplifier and mixer applications. These compact Xinger surface mount baluns are ideal for high volume manufacturing and are more reliable and repeatable than traditional baluns. The 3A512 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 3A512 is available on tape and reel for pick and place high volume manufacturing. ELECTRICAL SPECIFICATIONS*** Features: • • • • • • • • • • 1.4 – 1.6 GHz 180° Transformer 50 Ohm to 2 x 12.5 + j3.5 Ohm Low Insertion Loss High Power Even Order Suppression Input to Output DC Isolation Surface Mountable Tape & Reel Convenient Package Frequency Unbalanced Port Impedance Balanced Port Impedance* Return Loss Insertion Loss** GHz Ohms Ohms dB Min dB max 1.4 – 1.6 50 12.5+j3.5 15 0.30 Amplitude Balance Phase Balance Power Handling ΘJC dB max Degrees max Watts ºC / Watt ºC 0.40 180+ 5.0 250 5.8 -55 to +85 Operating Temp. ***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 specification excludes reflection loss. * 50Ω reference to ground Outline Drawing Side View Top View (Near-side) Pin 2 .750±.010 [19.05±0.25] .075±.008 [1.91±0.20] .100±.004 [2.54±0.10] Pin 3 .550±.010 [13.97±0.25] GND Pin 1 Bottom View (Far-side) Denotes Array Number .290±.004 [7.37±0.10] .035±.008 [0.89±0.20] Pin 2 Pin 3 .030±.004 TYP [0.76±0.10] .050±.008 [1.27±0.20] .050±.008 [1.27±0.20] .030±.004 [0.76±0.10] GND Pin 1 .232±.008 [5.91±0.20] .112±.004 [2.86±0.10] Dimensions are in Inches [Millimeters] 3A512 Rev A Mechanical Outline 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 3A512 Rev. A Typical Performance: 1200 MHz. to 1800 MHz. Amplitude Balance 3A512 Return Loss 3A512 0.5 0 0.4 -10 0.2 Return Loss [dB] Amplitude Balance [dB] 0.3 0.1 0 -0.1 -0.2 -0.3 -20 -30 -40 -0.4 -0.5 1200 1300 1400 1500 1600 1700 -50 1200 1800 1300 1400 Frequency [MHz] 0 1700 1800 1600 1700 1800 -170 Phase Balance [Degrees] -0.1 Insertion Loss [dB] 1600 Phase Balance 3A512 Insertion Loss 3A512 -0.2 -0.3 -0.4 -0.5 1200 1500 Frequency [MHz] 1300 1400 1500 1600 1700 1800 -175 -180 -185 -190 1200 1300 1400 1500 Frequency [MHz] Frequency [MHz] Pin Configuration: Mounting Configuration: To ensure proper electrical and thermal performance there must be a ground plane with 100% solder connection underneath the part .340 [8.64] .050 [1.27] .034 [0.86] 2 Places 12.5 Transmission Line Referenced to GND .075 [1.90] .030 [0.76] .075 [1.90] .080 [2.03] .221 [5.62] .450 [11.43] .030 TYP [0.76] .070 [1.78] Multiple plated thru holes to ground Dimensions are in Inches [Millimeters] 3A512 Rev A Mounting Footprint USA/Canada: Toll Free: Europe: (315) 432-8909 (800) 544-2414 +44 2392-232392 Available on Tape and Reel For Pick and Place Manufacturing. .115 [2.92] 50 Transmission Line