Document 117-1 Surface Mount Wideband RF Transformers 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/unbalanced mixing, matching, power splitting, coupling and signal inversion. To request free evaluation samples, contact Coilcraft or visit www.coilcraft.com. 1:1 Transformers Part number1 1812WBT-1L_ 1812WBT-2L_ 1812WBT-3L_ 1812WBT-4L_ 1812WBT-5L_ Inductance2 Test frequency Imp. ratio (µH) (MHz) pri : sec 14 10 1:1 5.3 10 1:1 1.25 50 1:1 0.220 50 1:1 0.090 50 1:1 DCR max (Ohms) 4.8 1.8 0.7 0.3 0.15 1.5:1 Transformers Part number1 1812WBT1.5-1L_ 1812WBT1.5-2L_ 1812WBT1.5-3L_ 1812WBT1.5-4L_ Inductance (µH)2 pri sec 5.0 3.3 2.5 1.6 1.0 0.6 0.144 0.090 Inductance (µH)2 pri sec 13.80 6.90 5.850 2.925 2.60 1.30 0.910 0.455 Isolation (Vrms) 50 50 50 50 50 Insertion loss (dB) <1 <1 <1 <1 <1.5 Bandwidth Color (MHz) dot 0.340–22 Yellow 0.800–60 Green 4–200 White 11–480 Orange 48–645 Red Test freq. (MHz) 10 10 10 10 Imp. ratio pri : sec 1.5 : 1 1.5 : 1 1.5 : 1 1.5 : 1 ⏲) DCR max (⏲ pri sec 1.05 0.87 0.74 0.58 0.43 0.34 0.18 0.14 IDC (mA) 400 500 500 700 Isolation Insertion Bandwidth Color (Vrms) loss (dB) (MHz) dot 50 0.5 1.3–100 Red 50 0.5 2.75–135 Orange 50 0.75 7.2–200 Yellow 50 2.25 38–535 Green Test freq. (MHz) 10 10 10 50 Imp. ratio pri : sec 2:1 2:1 2:1 2:1 ⏲) DCR max (⏲ pri sec 4.6 3.2 1.25 0.95 0.52 0.42 0.27 0.23 IDC (mA) 200 400 600 700 Isolation Insertion Bandwidth Color (Vrms) loss (dB) (MHz) dot 50 <1.5 0.800–23 Brown 50 <1.5 2.2–65 Red 50 <1.5 4–105 Orange 50 <1.5 11–200 Yellow 2:1 Transformers Part number1 1812WBT2-1L_ 1812WBT2-2L_ 1812WBT2-3L_ 1812WBT2-4L_ IDC (mA) 200 400 500 700 700 1. When ordering, please specify termination and packaging codes: 1812WBT-1.5-4LC 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 instead. 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 -40°C to +85°C. 4. Electrical specifications at 25°C. Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2006 Document 117-1 Revised 03/23/06 Document 117-2 Pad Detail 0.195 max 4,95 0.178 ±0.003 4,52 ±0,08 Color dot over primary 0.020 0,51 3 0.015 0,38 0.070 ref 1,78 1 4 Recommended Land Pattern 0.135 max 3,43 0.150 max 3,81 0.057 1,45 Top View 1 4 Pri Sec 2 3 0.115 2,92 0.020 0,51 2 0.015 ref 0,38 0.100 ±0.003 2,54 ±0,008 0.040 min 1,02 0.030 ±0.002 0,76 ±0,05 0.018 0,46 0.048 1,22 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. 0 Attenuation (dB, Re: 50 Ohms) Typical Frequency Attenuation 1:1 Transformers 1 2 3 4 5 -1 -4 -3 -2 -5 6 7 8 0.1 1 10 100 1000 100 1000 100 1000 Frequency (MHz) 0 Attenuation (dB, Re: 50 Ohms) Typical Frequency Attenuation 1.5:1 Transformers 1 2 3 4 5 -1 -2 -4 -3 6 7 8 0.1 1 10 Frequency (MHz) 0 Attenuation (dB, Re: 50 Ohms) Typical Frequency Attenuation 2:1 Transformers 1 2 3 4 5 -1 -3 -2 -4 6 7 8 0.1 1 10 Frequency (MHz) Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2006 Document 117-2 Revised 01/26/05