Custom Search

More than 10,000 searchable pages indexed.

Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it. Thanks!

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<
Job Board
About RF Cafe™
Copyright 1999-2015
Sitemap

Toroids: Powdered Iron

Use the table below to calculate inductance and number of turns per the following formulas.




Toroidal inductor equation formula
Where:
L = inductance in µH
AL = µ
H per 100 turns
N = number of full turns





AL Values
  Mix Type
Size 26 3 15 1 2 7 6 10 12 17 0
T-12 n/a 60 50 48 20 18 17 12 7.5 7.5 3.0
T-16 145 61 55 44 22 n/a 19 13 8.0 8.0 3.0
T-20 180 76 55 52 27 24 22 16 10 10 3.5
T-25 235 100 85 70 34 29 27 19 12 12 4.5
T-30 325 140 93 85 43 37 36 25 16 16 6.0
T-37 275 120 90 80 40 32 30 25 15 15 4.9
T-44 360 180 160 105 52 46 42 33 18.5 18.5 6.5
T-50 320 175 135 100 49 43 40 31 18 18 6.4
T-68 420 195 180 115 57 52 47 32 21 21 7.5
T-80 450 180 170 115 55 50 45 32 22 22 8.5
T-94 590 248 200 160 84 n/a 70 58 32 n/a 10.6
T-106 900 450 345 325 135 133 116 n/a n/a n/a 19
T-130 785 3350 250 200 110 103 96 n/a n/a n/a 15
T-157 870 420 360 320 140 n/a 115 n/a n/a n/a n/a
T-184 1640 720 n/a 500 240 n/a 195 n/a n/a n/a n/a
T-200 895 425 n/a 250 120 105 100 n/a n/a n/a n/a


Iron Powder Magnetic Core Properties
Mix Color Material μ Temp
Stability
(ppm/°C)
f
(MHz)
Uses
26 Yellow/White Hydrogen Reduced 75 825 DC -1 EMI filters, DC chokes
3 Gray Carbonyl HP 35 370 0.05 - 0.50 Exc. stability, good Q at low freq.
15 Red/White Carbonyl GS6 25 190 0.10 - 2 Exc. stability, good Q
1 Blue Carbonyl C 20 280 0.50 - 5 Exc. stability, good Q at low freq.
2 Red Carbonyl E 10 95 2 -30 High Q
7 White Carbonyl TH 9 30 3 - 35 Similar to mix 2 and mix 6, exc. temp stability
6 Yellow Carbonyl SF 8 35 10 -50 Very good Q and temp. stability for 20-50 MHz
10 Black Powdered Iron W 6 150 30 - 100 Good Q and stability for 40-100 MHz
12 Green/White Synthetic Oxide 4 170 50 - 200 Good Q, moderate temp. stability
17 Blue/Yellow Carbonyl 4 50 40 - 180 Similar to mix 12, better temp. stability, Q drops about 10% above 50 MHz, 20% above 100 MHz
0 Tan Phenolic 1 0 100 - 300 L varies greatly with winding technique


Iron Powder Magnetic Core Dimensions
Size Color Dimensions (in)
O.D. I.D. Height
T-200-2 Red 2.00 1.25 0.55
T-94-2 Red 0.94 0.56 0.31
T-80-2 Red 0.80 0.50 0.25
T-68-2 Red 0.68 0.37 0.19
T-50-2 Red 0.50 0.30 0.19
T-37-2 Red 0.37 0.21 0.12
T-25-2 Red 0.25 0.12 0.09
T-12-2 Red 0.125 0.06 0.05
T-50-10 Black 0.50 0.30 0.19
T-37-10 Black 0.37 0.21 0.12
T-25-10 Black 0.25 0.12 0.09
T-12-10 Black 0.125 0.06 0.05
T-94-9 Yellow 0.94 0.56 0.31
T-80-6 Yellow 0.80 0.50 0.25
T-68-6 Yellow 0.68 0.37 0.19
T-50-6 Yellow 0.50 0.30 0.19
T-26-6 Yellow 0.25 0.12 0.09
T-12-6 Yellow 0.125 0.06 0.05

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website