306 E. Alondra Blvd., Gardena, CA 90247-1059 • (310) 515-1720 • FAX (310) 515-1962
www.jwmiller.com
Conformal Coated RF Chokes
77F Series
Test SRF DCR
Part L (uH) Q Freq. (MHz) (Ω) I, DC
Number ±10% Min. (MHz) Min. Max. (mA)
77F1R0K 1.0 45 25.2 157 0.17 920
77F1R2K 1.2 50 7.96 144 0.21 880
77F1R5K 1.5 50 7.96 131 0.23 830
77F1R8K 1.8 55 7.96 121 0.25 790
77F2R2K 2.2 55 7.96 110 0.28 750
77F2R7K 2.7 60 7.96 100 0.30 720
77F3R3K 3.3 65 7.96 94 0.34 670
77F3R9K 3.9 65 7.96 86 0.37 640
77F4R7K 4.7 70 7.96 80 0.39 620
77F5R6K 5.6 70 7.96 74 0.43 590
77F6R8K 6.8 75 7.96 68 0.48 550
77F8R2K 8.2 80 7.96 53 0.52 530
77F100K 10 85 2.52 45 0.58 500
77F120K 12 75 2.52 34 0.63 480
77F150K 15 70 2.52 20 0.72 460
77F180K 18 65 2.52 14 0.77 430
77F220K 22 60 2.52 9.9 0.84 410
77F270K 27 55 2.52 7.6 0.94 390
±5%
77F330J 33 55 2.52 6.3 1.03 370
77F390J 39 50 2.52 6.3 1.12 350
77F470J 47 45 2.52 6.3 1.22 340
77F560J 56 40 2.52 6.2 1.34 320
77F680J 68 40 2.52 5.7 1.47 305
77F820J 82 35 2.52 5.3 1.62 290
77F101J 100 30 0.796 4.8 1.80 275
77F120J 120 70 0.796 3.8 3.70 185
77F151J 150 70 0.796 3.5 4.20 175
77F181J 180 70 0.796 3.3 4.60 165
77F221J 220 70 0.796 3.0 5.10 155
77F271J 270 65 0.796 2.8 5.80 145
77F331J 330 65 0.796 2.6 6.40 137
77F391J 390 65 0.796 2.4 7.00 133
77F471J 470 60 0.796 2.25 7.70 126
77F561J 560 60 0.796 2.1 8.50 120
77F681J 680 55 0.796 1.95 9.40 113
77F821J 820 55 0.796 1.85 10.5 105
77F102J 1000 50 0.796 1.40 14.0 100
59
Special Features
•
High current, Q & self-resonant frequency
•
Low DCR
•
Ferrite bobbin core
•
Epoxy coated to protect winding from
harsh environments
•
Low cost
•
Color bands identification
•
Dielectric strength 500Vrms
•
Operating temperature -55 to +105°C
•
Current to cause 35°C maximum
temperature rise
