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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Inductor Color Codes

Two methods of inductor markings are predominant - EIA (Electronic Industries Association) and Mil-Spec (Military Specification). Both use the standard color-number association familiar with color-coded resistors. The chart and examples below show that a Mil-Spec inductor can be identified by the presence of a double-width silver band at the left edge. Unless specified otherwise by the manufacturer, units are in microhenrys (µH). Mil-Spec inductors - and possibly some EIA types - use a silver or gold band in the multiplier to denote 0.1 and 0.01, respectively.

Inductor Color Codes

(4-Band EIA and 5-Band Mil-Spec Inductors)

Color Mil-Spec

Identifier

Double-Width

Silver Band

1st

Significant

Digit

2nd

Significant

Digit

Multiplier Tolerance
Silver Mil-Spec     0.01 ±10%
Gold       0.1 ±5%
Black   0 0 1  
Brown   1 1 10 ±1%
Red   2 2 100 ±2%
Orange   3 3 1000 (=1k) ±3%
Yellow   4 4 10k ±4%
Green   5 5 100k  
Blue   6 6 1000k  
Violet   7 7    
Gray   8 8    
White   9 9    
4-Band EIA Example 5-Band Mil-Spec Example
5 - 6 - 1 - Gold

56 * 101 µH, ±5%

56 * 10 µH, ±5%

560 µH, ±5%

Inductor 4-Band EIA Color Code - RF Cafe 

Silver - 6 - 2 - Gold - Red

Mil-Spec 62 * 0.01 µH, ±2%

Mil-Spec 0.62 µH, ±2%

Mil-Spec 620 nH, ±2%

Inductor 5-Band Mil-Spec Color Code - RF Cafe

Related Pages on RF Cafe

- Inductors & Inductance Calculations

- Inductance Conversions

- Standard Inductor Values

- Inductor Vendors

 

 

Posted  February 9, 2015

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