3D Model Datasheet

1812WBT Surface Mount

Wideband RF Transformers

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.

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Count	Unit price
1	$2.59
300	$2.06
600	$1.53
1200	$1.13
2400	$0.85
4800	$0.59

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

Termination

L = Gold over nickel over moly-manganese

Packaging

C = 7" machine-ready reel

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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
Part number 1 (Hover for schematics)	Pri	Sec	Test frequency (MHz)	Pri	Sec	Imp. ratio pri:sec	Current rating (mA)	Insertion loss (db)	Bandwidth (MHz)	Isolation Voltage (Vrms)	Color dot
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
Part number 1 (Hover for schematics)	Pri	Sec	Test frequency (MHz)	Pri	Sec	Imp. ratio pri:sec	Current rating (mA)	Insertion loss (db)	Bandwidth (MHz)	Isolation Voltage (Vrms)	Color dot
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

When ordering, please specify packaging code: e.g. 1812WBT1.5-4LC
Inductance is per winding.
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″ machine-ready reel. 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):

See FIT/MTBF Calculations

Performance curves

Frequency Response (1:1 Transformers)

Frequency Response (1.5:1 Transformers)

Frequency Response (2:1 Transformers)

Physical characteristics

Tape and Reel specification

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.

1812WBT Surface Mount

Wideband RF Transformers