30 13402 south 71 highway grandview, mo 64030 e-mail: torotel@sound.net (816) 761-6314 fax (816) 763-2278 core type style example: a 31 g 1 inductance (milihenrys) size part number ordering information * add style prefix (from this page) to part number common mode inductors for emi/rfi applications common mode inductors are most often used to eliminate line transmitted noise, such as that caused by transistors, scr?s, etc., in switch mode regulated power supplies. interference caused by multiple equipment on a common power line can be minimized by the ?split-winding? design, thus reducing the inherent conducted noise to an acceptable level. c2 power source l2 c3 c1 l3 l1 emi common mode suppression inductor 2 1 34 ? inductance and dcr values shown are for each winding other inductances are available. ? dci is for 40o c temperature rise. ** test level is at 1 khz. style f .630 max. .13 min. 1.210 max. 1.200 max. style na, nb .250 min. .300 .600 max. .020 1.250 max. lead dia. style f .13 min. 1.460 max. 1.350 max. .250 min. .300 .800 max. .020 1.450 max. 1.000 1.270 part number "l"? ( mh ) lead dia. dcr ? ( ? ) max. dci ? ( amps ) leakage inductance ( h ) test ** level ( vrms ) * 32k2 2.0 7.5 0.02 25 0.08 0.047 * 32k4 4.0 5.2 0.04 45 0.20 0.036 * 32k8 8.0 3.2 0.12 90 0.50 0.032 * 32k16 16.0 2.6 0.16 180 1.00 0.032 * 31g1 1.0 6.0 0.02 12 0.08 0.036 * 31g3 3.0 3.5 0.06 35 0.20 0.032 * 31g10 10.0 1.8 0.24 130 0.50 0.032 ? maximum operating temperature: 130 o c. (ambient + temperature rise) dielectric strength: 1500 vrms winding balance: 1% a typical circuit for the elimination of noise is shown above. the filter contains two stages, one for common mode noise (l1, c1 and c2) and one for conducted noise (l2, l3 and c3). special note should be made of the phasing dots. part number "l" ? ( mh ) lead dia. dcr ? ( ? ) max. dci ? ( amps ) leakage inductance ( h ) test ** level ( vrms ) dimensions are in inches for lead dia. see tables above .050 dia. .400 .800 .830 max. .050 dia. .600 .900 31 42 31 42 1 2 2 4 1 3 3 4 style na, nb style a style a style description na with foot nb without foot these parts may be special ordered with a 4-40unc x 5 threads min. insert lead dia. smps 1 3 .20 min. .750 max. 1.270 lead dia. 2 4 1.350 max. .300 1 3 .20 min. .560 max. 1.000 lead dia. 2 4 1.130 max. .300
31 torotel products inc 13402 south 71 highway grandview, mo 64030 phone: (816)761-6314 fax: (816) 763-2278 e-mail: torotel@sound.net b dia. c dia. d dia. 108 o 72 o 72 o 108 o .020 .010 (0.51) a common mode inductors terminal arrangement b terminal arrangement a b dia. a insert .200 deep min. d dia. part number current ( dc amps ) inductance ( mh ) * series connected 1.00 .25 (25.4 6.35) 1.00 .25 (25.4 6.35) dcr ( ? ? ? ? ? ) case part number current ( dc amps ) dcr ( ? ? ? ? ? ) series connected case pk-01 20.0 0.06 54.00 1 pk-02 20.0 0.10 29.00 2 pk-03 20.0 0.14 20.00 3 pk-04 20.0 0.22 12.40 4 pk-05 20.0 0.29 10.20 5 pk-06 15.0 0.07 40.50 1 pk-07 15.0 0.12 22.00 2 pk-08 15.0 0.16 15.00 3 pk-09 15.0 0.25 9.30 4 pk-10 15.0 0.33 7.70 5 pk-11 10.0 0.08 27.00 1 pk-12 10.0 0.14 14.60 2 pk-13 10.0 0.20 10.00 3 pk-14 10.0 0.31 6.20 4 pk-15 10.0 0.40 5.10 5 pk-16 7.5 0.10 20.30 1 pk-17 7.5 0.17 11.00 2 pk-18 7.5 0.24 7.50 3 pk-19 7.5 0.38 4.70 4 pk-20 7.5 0.49 3.80 5 pk-21 5.0 0.12 13.50 1 pk-22 5.0 0.21 7.30 2 pk-23 5.0 0.30 5.00 3 pk-24 5.0 0.47 3.10 4 pk-25 5.0 0.60 2.60 5 pk-26 3.0 0.16 8.10 1 pk-27 3.0 0.27 4.40 2 pk-28 3.0 0.38 3.00 3 pk-29 3.0 0.60 1.90 4 pk-30 3.0 0.78 1.50 5 all inductors have split windings for versatility. they can be connected in series, parallel or individually for balanced filtering applications. the ratings in the tables below are for a series-aided connection of both windings. the inductance of a parallel connection of these windings will result in 25% of the inductance at twice the rated current. the dcr will be 25% of the series connection . pk-31 2.00 0.19 5.40 1 pk-32 2.00 0.33 2.90 2 pk-33 2.00 0.47 2.00 3 pk-34 2.00 0.74 1.30 4 pk-35 2.00 0.95 1.00 5 pk-36 1.00 0.27 2.70 1 pk-37 1.00 0.47 1.50 2 pk-38 1.00 0.66 1.00 3 pk-39 1.00 1.00 0.62 4 pk-40 1.00 1.30 0.50 5 pk-41 0.75 0.31 2.00 1 pk-42 0.75 0.54 1.00 2 pk-43 0.75 0.76 0.75 3 pk-44 0.75 1.20 0.47 4 pk-45 0.75 1.60 0.38 5 pk-46 0.50 0.38 1.30 1 pk-47 0.50 0.66 0.66 2 pk-48 0.50 0.93 0.50 3 pk-49 0.50 1.47 0.31 4 pk-50 0.50 1.90 0.25 5 pk-51 0.25 0.53 0.66 1 pk-52 0.25 0.93 0.33 2 pk-53 0.25 1.30 0.25 3 pk-54 0.25 2.08 0.16 4 pk-55 0.25 2.70 0.13 5 pk-56 0.10 0.78 0.30 1 pk-57 0.10 1.35 0.17 2 pk-58 0.10 1.95 0.11 3 pk-59 0.10 3.08 0.07 4 pk-60 0.10 3.88 0.06 5 pk-61 0.04 1.18 0.14 1 pk-62 0.04 2.03 0.07 2 pk-63 0.04 2.68 0.06 3 *inductance is measured at 0.1 v rms and 10 khz 1 2 4 3 4 1 ideally suited as switching regulator and coupled inductors, common mode chokes, or in other power filtering applications. the temperature rise is less than 30 o c when measured at an ambient temperature of 100 o c, 0.1 v rms, 10 khz, and at rated dc current as shown in thetables below. a large selection of sizes provides maximum performance for minimum size. each unit is magnetically shielded. lead dia. .012 .012 .016 .016 .020 a max. .280 (7.11) .340 (8.63) .415 (10.54) .500 (12.70) .635 (16.12) b max. .410 (10.41) .500 (12.7) .630 (16.0) .800 (20.32) .950 (24.13) c .010 .260 (6.6) .350 (8.89) .440 (11.17) .560 (14.22) .670 (17.0) d .010 .160 (4.06) .250 (6.35) .340 (8.64) .460 (11.68) .570 (14.48) case 1 2 3 4 5 terminal arrangement a a a b b insert .138-32 unc-2b dimensions are in inches (mm) inductance ( mh ) * 120 o 60 o 90 o 90 o c dia. .020 .010 (0.51) 3 2 1 3 2 1 4 4 series parallel 3 2
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