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Copyright © 2002 by CT Magnetics. All rights reserved.
CT Magnetics reserves the right to make improvements or change specifications without notice. 87
7.12.14.01
Drum Cores
Size A B C D
Max. Max. Nom. Nom.
mm 21.3 28 12.7 4.95
inches 0.84 1.1 0.5 0.2
PHYSICAL DIMENSIONS
SPECIFICATIONS
L Test DCR Saturation Rated Dimension E
Part Inductance Freq. Max. DC DC Approx.
Number (µH) (kHz) (ΩΩ) (A) (A) Inches
CTDR3-1R5M 1.5 1.0 .003 116 21 .80
CTDR3-2R2M 2.2 1.0 .003 90 21 .80
CTDR3-3R3M 3.3 1.0 .003 74 21 .80
CTDR3-4R7M 4.7 1.0 .003 54 21 .80
CTDR3-6R8M 6.8 1.0 .004 47 21 .80
CTDR3-8R2M 8.2 1.0 .004 42 21 .80
CTDR3-100K 10 1.0 .006 38 17 .70
CTDR3-120K 12 1.0 .008 35 13 .69
CTDR3-150K 15 1.0 .009 32 13 .69
CTDR3-180K 18 1.0 .01 29 13 .69
CTDR3-220K 22 1.0 .01 25 13 .69
CTDR3-270K 27 1.0 .01 23 13 .79
CTDR3-330K 33 1.0 .03 20 13 .79
CTDR3-390K 39 1.0 .02 19 11 .79
CTDR3-470K 47 1.0 .02 19 9.0 .75
CTDR3-560K 56 1.0 .03 17 9.0 .75
CTDR3-680K 68 1.0 .03 15 9.0 .75
CTDR3-820K 82 1.0 .03 14 9.0 .75
CTDR3-101K 100 1.0 .03 13 9.0 .78
CTDR3-121K 120 1.0 .05 12 7.2 .75
CTDR3-151K 150 1.0 .06 11 5.5 .78
CTDR3-181K 180 1.0 .07 9.7 5.5 .78
CTDR3-221K 220 1.0 .08 8.7 5.5 .78
CTDR3-271K 270 1.0 .11 7.9 4.5 .75
CTDR3-331K 330 1.0 .12 7.1 4.5 .81
CTDR3-391K 390 1.0 .17 67 4.0 .75
CTDR3-471K 470 1.0 .19 6.0 4.0 .75
CTDR3-561K 560 1.0 .21 5.5 4.0 .75
CTDR3-681K 680 1.0 .26 5.0 2.8 .72
CTDR3-821K 820 1.0 .29 4.5 2.8 .84
CTDR3-102K 1000 1.0 .43 4.1 2.0 .75
CTDR3-122K 1200 1.0 .46 3.7 2.0 .75
CTDR3-152K 1500 1.0 .52 3.4 2.0 .75
CTDR3-182K 1800 1.0 .71 2.8 1.6 .77
CTDR3-222K 2200 1.0 1.0 2.5 1.3 .77
CTDR3-272K 2700 1.0 1.1 2.3 1.3 .77
CTDR3-332K 3300 1.0 1.3 2.0 1.3 .75
CTDR3-392K 3900 1.0 1.7 1.8 1.0 .75
CTDR3-472K 4700 1.0 1.9 1.7 1.0 .75
CTDR3 Series
From 1.5 µH to 4,700 µH
Not shown at actual size.
CHARACTERISTICS
Description: Radial leaded drum core inductor
Applications: Used in switching regulators, power amplifiers,
power supplies, SCR and Triac controls, speaker crossover
networks, RFI suppression and filters
Operating Temperature: -20°C to +100°C
Inductance Tolerance: ±10%, ±20%
Testing: Inductance is tested on an HP4284A at 1.0 kHz
Packaging: Bulk pack
Leads: Tinned for PC mounting to within 1/16”of the parts body
Sleeving: Coils finished with UL-VW-1 sleeving
Mounting: Center hole furnished for mechanical mounting
Rated DC Current: Measured at 20°C
Saturation Current: Lowers inductance by 5%
Miscellaneous: Non-standard tolerances and other
values available
Additional Information: Additional electrical & physical
information available upon request
Samples available. See website for ordering information.
Parts are marked to indicate tolerance available.
K = ±10%, M = ±20%
