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*** 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 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 dB max Degrees max Watts ºC / Watt ºC 0.40 180± 5.0 150 7.2 -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 excludes reflected power. * 25Ω reference to ground Outline Drawing Side View Top View (Near-side) .480±.010 [12.19±0.25] Pin 2 Bottom View (Far-side) .027±.004 [0.69±0.10] .076±.008 [1.93±0.20] Pin 2 .062±.008 [1.56±0.20] Pin 1 Pin 1 .650±.010 [16.51±0.25] .121±.004 [3.07±0.10] .339±.008 [8.62±0.20] GND Denotes Array Number .027±.004 [0.69±0.10] GND .130±.008 [3.30±0.20] Pin 3 .035±.004 TYP [0.89±0.10] Pin 3 .038±.008 [0.98±0.20] Dimensions are in Inches [Millimeters] 3A525 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 3A525 Rev. A Typical Performance: 1200 MHz. to 2200 MHz. Return Loss 3A525 Amplitude Balance 3A525 0.5 0 0.4 -5 -10 0.2 Return Loss [dB] Amplitude Balance [dB] 0.3 0.1 0 -0.1 -0.2 -15 -20 -25 -30 -0.3 -35 -0.4 -0.5 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 -40 1200 2200 1300 1400 1500 1700 1800 1900 2000 2100 2200 1900 2000 2100 2200 Phase Balance 3A525 -170 -0.05 -172 -0.1 -174 Phase Balance [Degrees] Insertion Loss [dB] Insertion Loss 3A525 0 -0.15 -0.2 -0.25 -0.3 -0.35 -0.4 -0.45 -0.5 1200 1600 Frequency [MHz] Frequency [MHz] -176 -178 -180 -182 -184 -186 -188 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 -190 1200 1300 1400 Frequency [MHz] 1500 1600 1700 1800 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 50 Transmission Line .121 [3.07] Multiple plated thru holes to ground .070 [1.78] .210 [5.32] .390 [9.91] .130 [3.30] .380 [9.65] .049 [1.24] .034 TYP [0.86] Dimensions are in Inches [Millimeters] 3A525 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. 2 Places 25 Transmission Line Referenced to GND