Model 3A325 Rev. B Xinger Balun 50Ω to 25Ω Balanced Description The 3A325 is a low profile balanced to unbalanced transformer designed for pushpull amplifiers in an easy to use surface mount package for NMT450 and TV broadcast applications. These compact Xinger® surface mount baluns are ideal for high volume manufacturing and are more reliable and repeatable than traditional baluns. The 3A325 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 3A325 is available on tape and reel for pick and place high volume manufacturing. ELECTRICAL SPECIFICATIONS*** Features: • • • • • • • • • • • 470 – 860 MHz 180° Transformer 50 Ohm to 25 Ohm Broad Band Low Insertion Loss High Power Even Order Harmonic Suppression Input to Output DC Isolation Surface Mountable Tape & Reel Convenient Package Frequency Unbalanced Port Impedance Balanced Port Impedance* Return Loss Insertion Loss** MHz Ohms Ohms dB min dB max 470 - 860 50 25 10 0.65 Amplitude Balance Phase Balance Power Handling ΘJC dB max Degrees max Watts ºC / Watt ºC 0.5 180+ 5.0 275 4.4 -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 reflected power. *25Ω reference to ground Outline Drawing Top View (Near-side) Botttom View (Far-side) Side View .076±.008 [1.93±0.20] .750±.010 [19.05±0.25] Pin 2 .023±.004 [0.58±0.10] .064±.008 [1.63±0.20] Pin 2 Pin 1 .870±.010 [22.10±0.25] Pin 1 .023±.004 [0.58±0.10] .129±.004 [3.28±0.10] GND .450±.008 [11.44±0.20] GND .134±.008 [3.40±0.20] Denotes Array Number Pin 3 .027±.004 TYP [0.69±0.10] Pin 3 .044±.008 [1.12±0.20] Dimensions are in Inches [Millimeters] 3A325 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 3A325 Rev. B Typical Performance: 300 MHz to 1000 MHz Amplitude Balance 3A325 Return Loss 3A325 1 0 0.8 -5 -10 0.4 R eturn Loss [dB ] Am plitude Balance [dB] 0.6 0.2 0 -0.2 -0.4 -15 -20 -25 -30 -0.6 -35 -0.8 -1 300 400 500 600 700 800 900 -40 300 1000 400 500 600 -0.05 -172 -0.1 -174 -0.15 -0.2 -0.25 -0.3 -0.35 900 1000 -182 -184 -188 700 800 -180 -186 600 1000 -178 -0.45 500 900 -176 -0.4 400 800 Phase Balance 3A325 -170 Phase Balance [deg] Insertion Loss [dB] Insertion Loss 3A325 0 -0.5 300 700 Frequency [MHz] Frequency [MHz] 800 900 1000 -190 300 400 500 Frequency [MHz] 600 700 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 .121 [3.07] Multiple plated thru holes to ground .069 [1.77] .325 [8.25] .650 [16.52] .610 [15.50] .130 [3.30] .049 [1.24] .034 TYP [0.86] Dimensions are in Inches [Millimeters] 3A325 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. 50 Transmission Line