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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 $1.94
600 $1.44
1200 $1.06
2400 $0.80
4800 $0.55

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
(Hover for schematics)
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
(Hover for schematics)
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
(Hover for schematics)
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). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • B = Less than full reel
    In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to C.
  • 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):

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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