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 3A425 rev. c xinger balun 50 ? to 25 ? balanced description the 3A425 is a low profile balanced to unbalanced transformer designed for push- pull amplifiers in an easy to use surf ace mount package covering gsm, d-amps and nmt900 applications. these compact xinger ? surface mount baluns are ideal for high volume manufacturing and are more reliable and repeatable than traditional baluns. the 3A425 has an unbalanced port impedance of 50 and balanced port impedances of 25 to ground with a 50 balance between outputs. this eases the matching of the push-pull amplifier?s po wer 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 3A425 is available on tape and reel for pick and place high volume manufacturing. electrical specifications*** features: ? 800 ? 1000 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 800 - 1000 50 25 15 0.35 amplitude balance phase balance power handling jc operating temp. db max degrees max watts oc / watt oc 0.4 180+ 5.0 250 5.3 -55 to +85 ***specification based on performanc e of unit properly installed on microstrip printed circuit boards with 50 nominal impedance. specifications subject to change without notice. **insertion loss excludes reflected power. * 25 reference to ground outline drawing 3 a 4 2 5 m e c h a n i c a l o u t l i n e d i m e n s i o n s a r e i n i n c h e s [ m i l l i m e t e r s ] .750 .010 [19.05 0.25 ] .790 .010 [20.07 0.25 ] pin 1 pin 2 pin 3 gnd denotes array number .076 .008 [1.93 0.20 ] t o p v i e w ( n e a r - s i d e ) .031 .004 typ [0.80 0.10 ] .060 .008 [1.52 0.20 ] .035 .004 typ [0.89 0.10 ] .401 .008 [10.19 0.20 ] .121 .004 [3.07 0.10 ] .040 .008 [1.02 0.20 ] .122 .008 [3.10 0.20 ] .027 .004 [0.69 0.10 ] pin 2 pin 3 b o t t o m v i e w ( f a r - s i d e ) s i d e v i e w
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 3A425 rev. c typical performance: 600 mhz. to 1200 mhz. amplitude balance 3A425 -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 600 700 800 900 1000 1100 1200 frequency [mhz] am plitude balance [db] return loss 3A425 -40 -35 -30 -25 -20 -15 -10 -5 0 600 700 800 900 1000 1100 1200 frequency [mhz] r eturn loss [db ] insertion loss 3A425 -0.5 -0.45 -0.4 -0.35 -0.3 -0.25 -0.2 -0.15 -0.1 -0.05 0 600 700 800 900 1000 1100 1200 frequency [mhz] insertion loss [db] phase balance 3A425 -190 -188 -186 -184 -182 -180 -178 -176 -174 -172 -170 600 700 800 900 1000 1100 1200 frequency [mhz] phase balance [degrees] pin configuration: mounting configuration: dimensions are in inches [millimeters] 3A425 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] 50 ? transmission line .070 [1.78] .651 [16.54] .049 [1.24] .034 typ [0.86] 2 places 25 ? transmission line referenced to gnd .130 [3.30] .531 [13.48] .280 [7.11] multiple plated thru holes to ground
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