? coilcraft, inc. 2011 specifications subject to change without notice. please check our website for latest information. surface mount wideband rf transformers document 117-1 document 117-1 revised 03/23/06 available in a variety of impedance versions, coilcraft?s wbt series chip transformers provide wide band pass performance in a small surface mount package. the transformers are built on an 1812 size ferrite body with a ceramic base. they feature 50 v isolation and a 1/4 watt rf input power rating. the top is a high temperature material that creates a flat surface for auto insertion. the parts are packaged in tape and reel for easy dispensing. applications include impedance matching, voltage or current transformation, dc isolation, balanced/unbal- anced mixing, matching, power splitting, coupling and signal inversion. to request free evaluation samples, contact coilcraft or visit www.coilcraft.com . 1:1 transformers part inductance 2 test frequency imp. ratio dcr max i dc isolation insertion bandwidth color number 1 (h) (mhz) pri : sec (ohms) (ma) (vrms) loss (db) (mhz) dot 1812wbt-1l_ 14 10 1 : 1 4.8 200 50 <1 0.340 ? 22 yellow 1812wbt-2l_ 5.3 10 1 : 1 1.8 400 50 <1 0.800 ? 60 green 1812wbt-3l_ 1.25 50 1 : 1 0.7 500 50 <1 4 ? 200 white 1812wbt-4l_ 0.220 50 1 : 1 0.3 700 50 <1 11 ? 480 orange 1812wbt-5l_ 0.090 50 1 : 1 0.15 700 50 <1.5 48 ? 645 red 1.5:1 transformers part inductance (h) 2 test freq. imp. ratio dcr max ( ) i dc isolation insertion bandwidth color number 1 pri sec (mhz) pri : sec pri sec (ma) (vrms) loss (db) (mhz) dot 1812wbt1.5-1l_ 5.0 3.3 10 1.5 : 1 1.05 0.87 400 50 0.5 1.3 ? 100 red 1812wbt1.5-2l_ 2.5 1.6 10 1.5 : 1 0.74 0.58 500 50 0.5 2.75 ? 135 orange 1812wbt1.5-3l_ 1.0 0.6 10 1.5 : 1 0.43 0.34 500 50 0.75 7.2 ? 200 yellow 1812wbt1.5-4l_ 0.144 0.090 10 1.5 : 1 0.18 0.14 700 50 2.25 38 ? 535 green 2:1 transformers part inductance (h) 2 test freq. imp. ratio dcr max ( ) i dc isolation insertion bandwidth color number 1 pri sec (mhz) pri : sec pri sec (ma) (vrms) loss (db) (mhz) dot 1812wbt2-1l_ 13.80 6.90 10 2 : 1 4.6 3.2 200 50 <1.5 0.800 ? 23 brown 1812wbt2-2l_ 5.850 2.925 10 2 : 1 1.25 0.95 400 50 <1.5 2.2 ? 65 red 1812wbt2-3l_ 2.60 1.30 10 2 : 1 0.52 0.42 600 50 <1.5 4 ? 105 orange 1812wbt2-4l_ 0.910 0.455 50 2 : 1 0.27 0.23 700 50 <1.5 11 ? 200 yellow 1. when ordering, please specify termination and packaging codes: 1812wbt1.5-4 lc termination: l = rohs compliant gold over nickel over moly-manganese special order: t = rohs tin-silver-copper (95.5/4/0.5) or s = non-rohs tin-lead (63/37). packaging: c =7 machine-ready reel. eia-481 embossed plastic tape (600 parts per full reel). b = less than full reel. in tape, but not machine ready. to have a leader and trailer added ($25 charge), use code letter c instea d. d =13 machine-ready reel. eia-481 embossed plastic tape. factory order only, not stocked (2200 parts per full reel). 2. inductance is per winding 3. operating temperature range -40c to +85c. 4. electrical specifications at 25c. measurements are referenced to 50 ohms.
? coilcraft, inc. 2011 specifications subject to change without notice. please check our website for latest information. document 117-2 document 117-2 revised 01/26/05 typical frequency attenuation 1:1 transformers typical frequency attenuation 1.5:1 transformers typical frequency attenuation 2:1 transformers 4 3 1 2 top view 0.070 1,78 0.100 0.003 2,54 0,008 0.178 0.003 4,52 0,08 0.150 3,81 max ref color dot over primary 0.135 3,43 max 0.195 4,95 max 1 23 4 pri sec 0.048 1,22 0.015 0,38 0.115 2,92 0.018 0,46 0.020 0,51 0.057 1,45 recommended land pattern 0.015 0,38 ref 0.040 1,02 0.020 0,51 min 0.030 0.002 0,76 0,05 pad detail attenuation (db, re: 50 ohms) frequency (mhz) 0 1 2 3 4 5 6 7 8 0.1 1 10 100 1000 -1 -2 -4 -3 -5 attenuation (db, re: 50 ohms) 0 1 2 3 4 5 6 7 8 frequency (mhz) 0.1 1 10 100 1000 -1 -2 -4 -3 attenuation (db, re: 50 ohms) 0 1 2 3 4 5 6 7 8 frequency (mhz) 0.1 1 10 100 1000 -1 -2 -4 -3 weight: 131 ? 152 mg tape and reel: 600/7 reel; 2200/13 reel 12 mm tape width for packaging data see tape and reel specifications section. measured on a network analyzer (re: 50 ohms)
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