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Amidon
Cores, Beads, Rods
and Balun Kits

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The Amidon Associates produces a broad line of ferrite beads, coil forms, cores and specialty items for the electronic experimenter.
These products have wide use in RFI suppressions, antenna design and matching. (Dimensions are in inches). Click here for material chart.

A Ferrite bead is a dowel-like device which has a center hole and is composed of ferromagnetic material. When placed on to a current carrying conductor it will act as an RF choke. It offers convenient, inexpensive, yet effective means
of RF shielding, parasitic suppression and RF decoupling.

Order # Model Description Pkg. O.D. I.D. Height RFI Attenuation List Price Order
  FB  43-    101 Ferrite Beads   12 .138 .051 .128 40-200 MHz   Not in stock
#4610 FB  43-    201 Ferrite Beads   12 .076 .043 .150 30-400 MHz $7.20 $2.98 Order
#1528 FB  43-    801 Ferrite Beads   12 .296 .094 .297 40-200 MHz $8.40 $2.98 Order
  FB  43-  2401 Ferrite Beads   12 .380 .197 .190 40-200 MHz   Not in stock
#4491 FB  43-  6301 Ferrite Beads   12 .375 .194 .410 40-200 MHz $7.80 $2.98 Order
  FB  61-    101 Ferrite Beads   12 .138 .051 .128 above 200 MHz   Not in stock
#1532 FB  73-    101 Ferrite Beads   12 .138 .051 .128 10-50 MHz $6.00 $2.98 Order
  FB  73-    801 Ferrite Beads   12 .296 .094 .297 10-50 MHz   Not in stock
  FB  73-  1801 Ferrite Beads   12 .200 .062 .437 10-50 MHz   Not in stock
  FB  73-  2401 Ferrite Beads   12 .380 .197 .190 10-50 MHz   Not in stock
  FB  75B-  101 Ferrite Beads   12 .138 .051 .128 2-30 MHz   Not in stock
#2838 FB  77-  6301 Ferrite Beads   12 .375 .194 .410 2-30 MHz $8.40 $4.20 Order

Ferrite toroidal cores. AL values = mH/1000 turns. First numerals in model indicate O.D., second indicate material.
Order # Model Description Pkg. O.D. I.D. Height AL List Price Order
#1536 FT  23-61 Ferrite Toroidal Core   4 .230 .120 .060 24.8 $  7.00 $  2.98 Order
#1537 FT  23-77 Ferrite Toroidal Core   4 .230 .120 .060 356 $  3.00 $  1.50 Order
#1538 FT  37-43 Ferrite Toroidal Core   4 .375 .187 .125 420 $  3.60 $  1.80 Order
#0602 FT  37-61 Ferrite Toroidal Core   4 .375 .187 .125 55.3   Not in stock
#4348 FT  37-67 Ferrite Toroidal Core   4 .375 .187 .125 17.7 $  3.60 $  1.80 Order
  FT  50-43 Ferrite Toroidal Core   3 .500 .281 .188 523   Not in stock
  FT  50-61 Ferrite Toroidal Core   3 .500 .281 .188 68   Not in stock
  FT  50-J Ferrite Toroidal Core   3 .500 .281 .188 2710   Not in stock
#1544 FT  82-43 Ferrite Toroidal Core   3 .825 .520 .250 557 $  5.90 $  2.98 Order
#3579 FT  82-61 Ferrite Toroidal Core   3 .825 .520 .250 73.3 $  6.00 $  2.98 Order
  FT  82-77 Ferrite Toroidal Core   3 .825 .520 .250 1060   Not in stock
   FT114-43 Ferrite Toroidal Core   1 1.142 .750 .295 603   Not in stock
  FT114-61 Ferrite Toroidal Core   1 1.142 .750 .295 79.3   Not in stock
#2953 FT193A-F Ferrite Toroidal Core   1 1.932 1.250 .750 4460 $12.00 $  4.98 Order
  FT193-J Ferrite Toroidal Core   1 1.932 1.252 .625 6065   Not in stock
  FT240-61 Ferrite Toroidal Core   1 2.400 1.400 .500 173   Not in stock
  FT240-77 Ferrite Toroidal Core   1 2.400 1.400 .500 3130   Not in stock
  FT240-K Ferrite Toroidal Core   1 2.400 1.400 .500     Not in stock

Iron powder toroidal cores. AL values = µH/100 turns.
Order # Model Description Pkg. O.D. I.D. Height AL List Price Order
#1552 T  25-  2 Iron Powder Toroidal Core   5 .250 .120 .096 34 $  4.95 $  2.48 Order
#1554 T  30-  6 Iron Powder Toroidal Core   5 .370 .151 .128 36 $  4.95 $  2.48 Order
#0647 T  37-  2 Iron Powder Toroidal Core   5 .375 .205 .128 40 $  4.50 $  1.98 Order
  T  37-  6 Iron Powder Toroidal Core   5 .375 .205 .128 30   Not in stock
#1562 T  37-10 Iron Powder Toroidal Core   5 .375 .205 .128 25 $  4.50 $  1.98 Order
#4869 T  44-10 Iron Powder Toroidal Core   4 .440 .229 .159 33 $  4.60 $  1.98 Order
   T  50-  2 Iron Powder Toroidal Core   4 .500 .300 .190 49   Discontinued
#1565 T  50-  6 Iron Powder Toroidal Core   4 .500 .300 .190 40 $  5.00 $  1.98 Order
#4821 T  50-10 Iron Powder Toroidal Core   4 .500 .303 .190 31 $  5.00 $  1.98 Order
#1566 T  68-  2 Iron Powder Toroidal Core   4 .690 .370 .190 57 $  5.00 $  1.98 Order
  T  68-  6 Iron Powder Toroidal Core   4 .690 .370 .190 47 $  Not in stock
#1556 T  80-  2 Iron Powder Toroidal Core   3 .795 .495 .250 55 $  5.00 $  1.98 Order
#4868 T  80-  6 Iron Powder Toroidal Core   3 .795 .495 .250   $  7.20 $  2.98 Order
#4779 T  94-  2 Iron Powder Toroidal Core   2 .942 .560 .312   $ 3.50 $  1.48 Order
#1567 T  94-26 Iron Powder Toroidal Core   2 .942 .560 .312 590 $  3.00 $  1.48 Order
#6847 T106-  1 Iron Powder Toroidal Core   2 1.060 .570 .437   $  8.20 $  3.98 Order
  T106-  2 Iron Powder Toroidal Core   2 1.060 .570 .437 325   Not in stock
#6848 T106-  3 Iron Powder Toroidal Core   2 1.060 .570 .437   $  7.90 $  2.98 Order
#4609 T106-  6 Iron Powder Toroidal Core   2 1.060 .570 .437 116 $  9.90 $  3.98 Order
#6849 T106-15 Iron Powder Toroidal Core   2 1.060 .570 .437   $  9.00 $  3.98 Order
#0781 T184-  2 Iron Powder Toroidal Core   1 1.840 .950 .710 240 $  8.00 $  3.98 Order
  T200-  2 Iron Powder Toroidal Core   1 2.000 1.250 .550 120   Not in stock

Multi-aperture cores. AL values = mh/1000 turns.
Order # Model Description Pkg. O.D. I.D. Hght Th AL List Price Order
  BN-43-202 Two Hole Core   4 .525 .150 .550 .295 2890   Not in stock
#1871 BN-43-302 Two Hole Core   4 .525 .150 .407 .295 2200 $6.00 $2.98 Order
  BN-73-702 Two Hole Core   4 .525 .150 .550 .295 8500   Not in stock

Split cores.
Order # Model Description Pkg. O.D. I.D. Hght D Max cbl D. List Price Order
#1087 2x31-3551p2 Split cores for round cable   1 1.15 .740 1.650 .579 0.750 $  9.99 $  4.98 Order
  2x43-  251p2 Split cores for round cable   1 .705 .275 1.272 .362 0.250   Not in stock
#1138 2x43-  151p2 Split cores for round cable   1 1.142 .528 1.280 .583 0.500 $12.95 $  5.98 Order

Ferrite rods. AL values = mH/1000 turns.
Order # Model Description Material Diameter Length AL Perm. List Price Order
  R33-050750 Ferrite Rod 33 .50 7.5 70 800   Not in stock
  R61-050400 Ferrite Rod 61 .50 4.0 43 125   Not in stock
  R61-050750 Ferrite Rod 61 .50 7.5 49 125   Not in stock

Balun Kits.
Order # Model Description Core Wire Ratios Price Order
  AB-240-125 Balun Kit FT-240-61 14 gauge 10 feet 4:1 or 1:1 Not in stock

Click here for information on the Amidon Technical Reference.


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