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irc advanced film division general note irc reserves the right to make changes in product speci?cation without notice or liability. all information is subject to ircs own data and is considered accurate at time of going to print. a subsidiary of tt electronics plc ? corpus christi texas 78411 usa ? irc advanced film division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? email: afdsales@irctt.com ? website: www.irctt.com series issue october 2006 rfaxx high frequency surface mount attenuators rfaxx series ? high power chip attenuators ? low return loss, long life and termperature stability resulting from ni-cr thin ?lm and heat conductive ceramic substrates ? industrial rf power sources, rf ampli?ers, radio and ?xed transmitter or mobile systems, and measurements model rfa53sd rfa54sd rfa54dd rfa55sd rfa55dd frequency range dc to 4ghz dc to 4ghz dc to 4ghz dc to 4ghz dc to 4ghz power rating @ 70c 0.25w 0.25w 0.25w 0.25w 0.25w attenuation 1 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40 db impedance 50 ? 2% absolute tcr 50ppm/c electrical data model rfa84sd rfa84dd rfa37sd rfa37dd rfa68dd frequency range dc to 1ghz dc to 1ghz dc to 1ghz dc to 1ghz dc to 1ghz power rating @ 70c 0.50w 0.50w 1.0w 1.0w 30w 2 attenuation 1 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40 db 10, 20, 30db impedance 50 ? 2% absolute tcr 50ppm/c notes: 1. attenuations tolerances as follows: 1, 2, 3, 4, 5, 6db: 0.2db 7, 8, 9, 10db: 0.3db 20, 30, 40db: 0.4db 2. rfa58dd rating of 30w with chip attached to proper heatsink. the rfaxx series of 50 ohm high frequency attenuators are available in a variety of sizes and termination styles to suit applications for mounting on heat sinks or normal pc board materials. high thermal conductivity aluminum nitride substrates provide the low resistance thermal path for high power dissipation applications. the rfaxx series is available with power dissipation to 30 watts when mounted to a heat sink. frequency performance up to 4 ghz assures proper operation in rf and microwave power ampli?ers, rf transmitters and receivers and rf power sources. sheet 1 of 4 46
irc advanced film division ? irc advanced film division ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? email: afdsales@irctt.com ? website: www.irctt.com series issue october 2006 rfaxx sheet 2 of 4 47 high frequency surface mount attenuators surface mount rf power attenuators rfa55dd20db impedance rfa55dd20db attenuation rfa55dd40db attenuation rfa55dd40db impedance rfa55dd40db vswr rfa55dd20db vswr 6 jul 2004 13:57:17 11 1 u fs 1: 50.178 w 1.4336 w 228.16 ph 1 000. 000 000 mhz 2: 50.141 w 2.8203 w 2 ghz 3: 50.213 w 3.8828 w 3 ghz 4: 50.305 w 4.791 w 4 ghz 5: 50.563 w 5.2852 w 5 ghz start .030 000 mhz stop 6 000. 000 000 mhz ch1 s prm cor 1 hp 6 jul 2004 10:02:26 11 1 u fs 1: 50.076 w 1.4336 w 95.473 pf 1 000. 599 997 mhz 2: 50.617 w -3.2188 w 2 ghz 3: 51.748 w -4.8027 w 3 ghz 4: 59.217 w -6.1836 w 4 ghz 5: 55.033 w -7.25 w 5 ghz start .030 000 mhz stop 6 000. 000 000 mhz ch1 s prm cor 1 hp 2 3 4 5 & !
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irc advanced film division ? irc advanced film division ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? email: afdsales@irctt.com ? website: www.irctt.com series issue october 2006 rfaxx sheet 3 of 4 48 high frequency surface mount attenuators physical data d c b a rfa53sd a a e d c b e d c b e c d c b e a d c b e e a d c b e a d c b e e a d b e e a d c b e a e a c b e e d rfa55sd type rfa53sd rfa54sd rfa54dd rfa55sd rfa55d rfa84sd rfa84dd rfa68dd rfa37sd rfa37dd a 5.00 5.00 5.00 5.00 5.00 8.00 8.00 6.70 13.00 13.00 b 2.70 3.80 3.80 4.50 4.50 5.25 5.25 8.65 7.00 7.00 c 0.70 0.70 0.70 0.70 0.70 0.70 0.70 1.05 0.70 0.70 d 1.20 1.20 1.20 1.20 1.20 1.40 1.40 1.00 2.00 2.00 e 0.80 0.80 0.80 1.00 1.00 1.10 1.10 0.80 1.40 1.40 rfa84sd rfa37sd rfa37dd rfa84dd rfa55dd rfa54sd rfa54dd rfa68dd note: all dimensions are in mm.
irc advanced film division ? irc advanced film division ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? email: afdsales@irctt.com ? website: www.irctt.com series issue october 2006 rfaxx sheet 4 of 4 49 high frequency surface mount attenuators test condition to meet load life 1000 hours, 70c 1.0% moisture load life 1000 hours, 40c 95% rh 1.0% solder heat resistance 350c, 3 sec. 1.0% solderability 235c, 3 sec. >95% coverage environmental data pre?x hfr - rfa53sd - 10db g z00 model rfa53sd; rfa54sd; rfa54dd; rfa55sd; rfa55dd; rfa84sd; rfa84dd; rfa68dd; rfa37sd; rfa37dd attenuation 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40db impedance tolerance g = 2% packaging z00 = 100 pcs/bulk package ordering data % of rated power 25 70 125 0 60 100 power derating curve ambient temperature (c)

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