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1812WBT Surface Mount

Wideband RF Transformers

RoHS compliant
  • The smallest RF transformers available
  • Available in both 1:1, 1.5:1 and 2:1 versions
  • 1812 size ferrite body with a ceramic base
  • Jacketed with a high temp material that creates a flat top for auto insertion
  • Typical applications are as impedance or isolation transformer
  • Can also be used for balanced to unbalanced (balun) conversion
  • RoHS-compliant. 260°C compatible. Gold over nickel over moly-manganese terminations.
Buy Now:
Count Unit price
1 $2.44
300 $1.81
600 $1.34
1200 $0.99
2400 $0.74
4800 $0.51

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
Request a Sample:

Specifications

Electrical specifications at 25°C. Measurements are referenced to 50 Ohms.

1:1 Transformers

Part number 1 L min per winding (µH) 2 Test frequency
(MHz)
DCR max (Ω) 3 Imp. ratio
pri:sec
Current
rating (mA)
Insertion
loss (db)
Bandwidth (MHz) Isolation
Voltage (Vrms)
Color dot
1812WBT-1L_ 14 10.0 4.8 1 : 1 200 < 1 0.34 22 50 Yellow
1812WBT-2L_ 5.3 10.0 1.8 1 : 1 400 < 1 0.8 60 50 Green
1812WBT-3L_ 1.3 50.0 0.70 1 : 1 500 < 1 4 200 50 White
1812WBT-4L_ 0.22 50.0 0.30 1 : 1 700 < 1 11 480 50 Orange
1812WBT-5L_ 0.090 50.0 0.15 1 : 1 700 < 1.5 48 645 50 Red

1.5:1 Transformers

Part number 1 L min per winding (µH) 2 Test frequency
(MHz)
DCR max (Ω) 3 Imp. ratio
pri:sec
Current
rating (mA)
Insertion
loss (db)
Bandwidth (MHz) Isolation
Voltage (Vrms)
Color dot
Pri Sec Pri Sec
1812WBT1.5-1L_ 5.0 3.3 10.0 1.1 0.87 1.5 : 1 400 < 0.5 1.3 100 50 Red
1812WBT1.5-2L_ 2.5 1.6 10.0 0.74 0.58 1.5 : 1 500 < 0.5 2.75 135 50 Orange
1812WBT1.5-3L_ 1.0 0.60 10.0 0.43 0.34 1.5 : 1 500 < 0.75 7.2 200 50 Yellow
1812WBT1.5-4L_ 0.14 0.090 10.0 0.18 0.14 1.5 : 1 700 < 2.25 38 535 50 Green

2:1 Transformers

Part number 1 L min per winding (µH) 2 Test frequency
(MHz)
DCR max (Ω) 3 Imp. ratio
pri:sec
Current
rating (mA)
Insertion
loss (db)
Bandwidth (MHz) Isolation
Voltage (Vrms)
Color dot
Pri Sec Pri Sec
1812WBT2-1L_ 14 6.9 10.0 4.6 3.2 2 : 1 200 < 1.5 0.8 23 50 Brown
1812WBT2-2L_ 5.9 2.9 10.0 1.3 0.95 2 : 1 400 < 1.5 2.2 65 50 Red
1812WBT2-3L_ 2.6 1.3 10.0 0.52 0.42 2 : 1 600 < 1.5 4 105 50 Orange
1812WBT2-4L_ 0.91 0.46 50.0 0.27 0.23 2 : 1 700 < 1.5 11 200 50 Yellow
Notes
  1. When ordering, please specify packaging code: e.g. 1812WBT1.5-4LC
  2. Inductance is per winding.
  3. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.

Termination:

  • L = RoHS compliant gold over nickel over moly-manganese.
  • T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). (Special order)

Packaging:

  • C = 7" machine-ready reel
    EIA-481 embossed plastic tape (600 parts per full reel).
  • B = Less than full reel
    On reel but not machine-ready.  To have a leader and trailer added ($25 charge), use code letter C instead.
  • D = 13" reel, machine-ready 
    EIA-481 embossed plastic tape. Factory order only, not stocked (2200 parts per full reel.
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
–40°C to +85°C with Irms current
Storage temperature range:
Component: –40°C to +85°C
Tape and reel packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
One per billion hours / one billion hours, calculated per Telcordia SR-332

Performance curves

Frequency Response (1:1 Transformers)

Frequency Response (1.5:1 Transformers)

Frequency Response (2:1 Transformers)

Physical characteristics

smwbtd.gifm2022lnd.gif
smWBT_pad.gifm2022sch.gif
dims_inches_mm.gif

Tape and Reel specification

tapereel_pl.gif

 
Parts per reel* Reel dimensions (mm) Tape dimensions (mm) Orientation
7" (178 mm) 13" (330 mm) A B C D E W P Po P1 H T
600 2200* 178/330 60/100 13 18,4 12,4 12 8 4 2 3,7 0,3
* Special order

General specification

Core Material:
Ferrite
Weight:
131 – 152 mg
Packaging:
600/7″ reel; 2200/13″ reel Plastic tape: 12 mm wide, 0.3 mm thick, 8 mm pocket spacing, 3.7 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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