National Magnetics Group, Inc. National Magnetics Group, Inc.

Multihole

Multihole

These are transformers used for impedance matching (often referred to as baluns) usually with one side balanced to ground and the other unbalanced (hence the name). They offer many possible winding arrangements.

  1. Material (-X): prefix for NiZn (ie. M-1121) and suffix for MnZn (ie. BC-1121-M20 or 12-315-B)
  2. Length: may be adjusted to suit application
  3. Tolerances (dimensional): ±2% (nominal value may vary based on material selected)
  4. Tolerances (inductance): ±30%
  5. Finishing: edge rounding and parylene coating available
  • Figure 1
  • Figure 2
  • Figure 3
  • Figure 4
  • Figure 5
BALUN:
BINOCULAR

pn
FIGURETHICKNESS (a)


inches
WIDTH (b)


inches
LENGTH


inches
INSIDE
DIAMETER (d)

inches
003154-X10.0530.1050.0270.023
003197-X10.0530.1050.0500.023
003208-X10.0530.10501000.023
BC-1121-X10.0570.1050.0500.020
12-311-X10.0790.1360.0370.034
12-314-X10.0790.1360.0650.034
12-315-X10.0790.1360.0930.034
003123-X10.0900.1800.0900.045
003282-X10.0900.1800.2000.045
12-322-X10.1200.2000.1200.047
BC-1602-X10.1200.2450.1250.055
12-340-X10.1600.2750.1250.073
12-345-X10.1600.2750.2500.073
12-350-X10.1600.2750.3000.073
12-360-X10.2950.5250.2600.150
12-365-X10.2950.5250.5650.150
12-368-X10.2950.5251.1300.150
BALUN:
RECTANGULAR

pn
FIGURETHICKNESS (a)


inches
WIDTH (b)


inches
LENGTH


inches
INSIDE
DIAMETER (d)

inches
003115-X40.0900.1800.0900.045
003074-X40.0900.1800.1800.045
BC-1151-X40.1080.2200.0400.050
003034-X40.2850.5300.2500.155
003002-X40.2850.5300.5500.155
003073-X40.3750.7650.5000.190
003022-X40.3750.7651.0000.190
003004-X40.3800.8000.8200.200
003051-X40.5001.0001.0000.120
003053-X40.5400.7601.0000.120
003077-X40.5601.1300.5000.250
003089-X40.5601.1301.1300.250
003008-X40.5601.1300.7500.340
003016-X40.8801.7501.0000.290
003055-X40.8801.7501.0000.400
003227-X40.9601.0000.3800.260
003371-X41.0001.0000.5400.160
BALUN:
BEAD - MULTIHOLE


pn
FIGUREOUTSIDE
DIAMETER (a)


inches
LENGTH



inches
INSIDE
DIAMETER (d)


inches
12-390-X50.2360.3940.032
12-328-X20.2480.1250.047
12-330-X20.2480.2550.047
12-332-X20.2480.4720.047
12-430-X20.2570.2550.052
12-432-X20.2570.4720.052
BC-1404-X20.2840.2500.052
BC-1133-X20.45005000.100
BALUN:
RECTANGULAR ID

pn
FIGURETHICKNESS (a)


inches
WIDTH (b)


inches
LENGTH


inches
INSIDE
TH x W (d)

inches
BC-1195-X30.0670.2130.0800.036 x 0.062
BC-1183-X30.2901.4650.7500.090 x 0.460