RF iron powder toroids

Order code: T20-10

Micrometals T20-10

Iron powder toroid core, 15 - 100 MHz, OD 5.08 mm

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Stock: 0 pcs

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Order code: T25-10

Micrometals T25-10

Iron powder toroid core, 15 - 100 MHz, OD 6.48 mm

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Stock: 227 pcs

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€0,280
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Order code: T25-17

Micrometals T25-17

Iron powder toroid core, 20 - 200 MHz, OD 6.48 mm

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Stock: 271 pcs On order: 4000

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€0,220
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Order code: T25-2

Micrometals T25-2

Iron powder toroid core, 0.25 - 20 MHz, OD 6.48 mm

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Stock: 6509 pcs

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€0,200
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Order code: T25-6

Micrometals T25-6

Iron powder toroid core, 3 - 40 MHz, OD 6.48 mm

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Stock: 1544 pcs On order: 10000

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€0,240
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Order code: T30-0

Micrometals T30-0

Non-magnetic phenolic material toroid core, 50 - 350 MHz, OD 7.8 mm

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Stock: 2921 pcs

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€0,210
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Order code: T30-1

Micrometals T30-1

Iron powder toroid core, 0.15 - 3 MHz, OD 7.8 mm

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Stock: 192 pcs

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€0,200
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Order code: T30-10

Micrometals T30-10

Iron powder toroid core, 15 - 100 MHz, OD 7.8 mm

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Stock: 1776 pcs

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€0,310
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Order code: T30-17

Micrometals T30-17

Iron powder toroid core, 20 - 200 MHz, OD 7.8 mm

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Stock: 2673 pcs

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€0,210
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Order code: T30-2

Micrometals T30-2

Iron powder toroid core, 0.25 - 20 MHz, OD 7.8 mm

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Stock: 10702 pcs

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€0,240
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Order code: T30-3

Micrometals T30-3

Iron powder toroid core, 0.02 - 1 MHz, OD 7.8 mm

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Stock: 1166 pcs

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€0,190
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Order code: T30-6

Micrometals T30-6

Iron powder toroid core, 3 - 40 MHz, OD 7.8 mm

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Stock: 10003 pcs

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€0,280
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Order code: T37-0

Micrometals T37-0

Non-magnetic phenolic material toroid core, 50 - 350 MHz, OD 9.53 mm

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Stock: 9327 pcs

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€0,220
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Order code: T37-1

Micrometals T37-1

Iron powder toroid core, 0.15 - 3 MHz, OD 9.53 mm

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Stock: 2409 pcs

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€0,370
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Order code: T37-10

Micrometals T37-10

Iron powder toroid core, 15 - 100 MHz, OD 9.53 mm

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Stock: 613 pcs

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€0,410
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Order code: T37-17

Micrometals T37-17

Iron powder toroid core, 20 - 200 MHz, OD 9.53 mm

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Stock: 1695 pcs

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€0,280
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Order code: T37-2

Micrometals T37-2

Iron powder toroid core, 0.25 - 20 MHz, OD 9.53 mm

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Stock: 6293 pcs

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€0,290
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Order code: T37-3

Micrometals T37-3

Iron powder toroid core, 0.02 - 1 MHz, OD 9.53 mm

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Stock: 2850 pcs

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€0,360
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Order code: T37-6

Micrometals T37-6

Iron powder toroid core, 3 - 40 MHz, OD 9.53 mm

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Stock: 7777 pcs

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€0,370
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Order code: T44-0

Micrometals T44-0

Non-magnetic phenolic material toroid core, 50 - 350 MHz, OD 11.2 mm

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Stock: 491 pcs

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€0,260
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Order code: T44-1

Micrometals T44-1

Iron powder toroid core, 0.15 - 3 MHz, OD 11.2 mm

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Stock: 455 pcs

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€0,530
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Order code: T44-10

Micrometals T44-10

Iron powder toroid core, 15 - 100 MHz, OD 11.2 mm

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Stock: 2108 pcs

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€0,630
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Order code: T44-17

Micrometals T44-17

Iron powder toroid core, 20 - 200 MHz, OD 11.2 mm

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Stock: 1935 pcs

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€0,430
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Order code: T44-2

Micrometals T44-2

Iron powder toroid core, 0.25 - 20 MHz, OD 11.2 mm

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Stock: 2626 pcs

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€0,340
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Order code: T44-3

Micrometals T44-3

Iron powder toroid core, 0.02 - 1 MHz, OD 11.2 mm

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Stock: 468 pcs

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€0,510
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Order code: T44-6

Micrometals T44-6

Iron powder toroid core, 3 - 40 MHz, OD 11.2 mm

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Stock: 618 pcs On order: 3000

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€0,570
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Order code: T50-0

Micrometals T50-0

Non-magnetic phenolic material toroid core, 50 - 350 MHz, OD 12.7 mm

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Stock: 5643 pcs

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€0,290
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Order code: T50-1

Micrometals T50-1

Iron powder toroid core, 0.15 - 3 MHz, OD 12.7 mm

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Stock: 3239 pcs

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€0,600
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Order code: T50-10

Micrometals T50-10

Iron powder toroid core, 15 - 100 MHz, OD 12.7 mm

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Stock: 1036 pcs

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€0,800
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Order code: T50-17

Micrometals T50-17

Iron powder toroid core, 20 - 200 MHz, OD 12.7 mm

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Stock: 3386 pcs

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€0,580
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Order code: T50-2

Micrometals T50-2

Iron powder toroid core, 0.25 - 20 MHz, OD 12.7 mm

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Stock: 3927 pcs

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€0,450
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Order code: T50-3

Micrometals T50-3

Iron powder toroid core, 0.02 - 1 MHz, OD 12.7 mm

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Stock: 1885 pcs

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€0,580
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Order code: T50-6

Micrometals T50-6

Iron powder toroid core, 3 - 40 MHz, OD 12.7 mm

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Stock: 2712 pcs On order: 18000

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€0,600
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Order code: T68-0

Micrometals T68-0

Non-magnetic phenolic material toroid core, 50 - 350 MHz, OD 17.5 mm

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Stock: 3133 pcs

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€0,480
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Order code: T68-1

Micrometals T68-1

Iron powder toroid core, 0.15 - 3 MHz, OD 17.5 mm

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Stock: 236 pcs

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€0,990
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Order code: T68-10

Micrometals T68-10

Iron powder toroid core, 15 - 100 MHz, OD 17.5 mm

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Stock: 538 pcs

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€1,360
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Order code: T68-17

Micrometals T68-17

Iron powder toroid core, 20 - 200 MHz, OD 17.5 mm

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Stock: 4321 pcs

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€0,920
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Order code: T68-2

Micrometals T68-2

Iron powder toroid core, 0.25 - 20 MHz, OD 17.5 mm

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Stock: 0 pcs On order: 6000

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€0,670
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Order code: T68-26A

Micrometals T68-26A

Iron powder toroid core T68-26A

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Stock: 0 pcs

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Order code: T68-3

Micrometals T68-3

Iron powder toroid core, 0.02 - 1 MHz, OD 17.5 mm

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Stock: 244 pcs

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€0,960
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Showing 1 - 40 of 83 results
More information

Micrometals Iron Powder Toroids – Selection Guide

Micrometals iron powder toroids are essential components for RF applications, filters, baluns, and inductors. This guide will help you choose the right model for your needs.

Comparison Infographic

Micrometals Iron Powder Toroids – Selection Guide

How to Choose the Right Toroid

  • Operating Frequency: Each mix is optimized for a specific frequency range.
  • Size: Indicated by the code (e.g., T50-2 = 0.50” diameter, mix #2).
  • AL Value: Useful for calculating the desired inductance.

Micrometals Materials Table

Material Reference
Permeability
Powder Type Temp Coefficient
of Perm (+ppm/°C)
Density
(g/cm³)
Max Frequency
(MHz)
Color Code
Toroid
-0 1 Phenolic N/A N/A N/A Tan/Tan
-1 20 Carbonyl Iron 280 6.4 10 Blue/Clear
-2 10 Carbonyl Iron 95 5.0 45 Red/Clear
-3 35 Carbonyl Iron 255 6.5 5.0 Gray/Clear
-5 5 Carbonyl Iron 280 5.0 10 Green/Clear
-6 8.5 Carbonyl Iron 35 5.0 55 Yellow/Clear
-7 9 Carbonyl Iron 30 5.0 50 White/Clear
-8 35 Carbonyl Iron 255 6.5 5.0 Yellow/Red
-10 6 Carbonyl Iron 150 4.9 83 Black/Clear
-15 25 Carbonyl Iron 190 6.4 7.0 Red/White
-17 4 Carbonyl Iron 50 4.8 170 Blue/Yellow

Materials ‑2, ‑5, ‑6, and ‑7

These are the most popular carbonyl iron mixes. They offer a high Q up to 40 MHz and are widely used in amateur radio and various communication applications. They are also suitable for moderate-band transformers operating in the 200 to 400 MHz frequency range.

Materials ‑1, ‑3, ‑8, and ‑15

These materials are annealed carbonyl irons with the highest permeability among carbonyl types. They are ideal for high Q applications below 1 MHz and for broadband transformers typically covering the 50 to 500 MHz range.

Materials ‑10 and ‑17

These are the highest frequency carbonyl iron materials . They provide a high Q up to 150 MHz and are commonly used in cable television applications . They are also suitable for moderate-band transformers operating between 400 and 700 MHz .

Material ‑0

This is a non-magnetic material used as a solid winding form for air-core coils. It offers excellent temperature stability and a high Q at the highest frequencies . It is also useful for moderate-band transformer applications typically covering the 600 MHz to 1 GHz range.

Example Products

  • T25-2: 0.25–20 MHz – ideal for HF baluns
  • T30-6: 3–40 MHz – great for RF filters
  • T37-17: 20–200 MHz – for VHF circuits

Inductance Calculation

Use the following formula to calculate inductance:

  L = AL × (N² / 100²)

Where L is the inductance in µH, AL is the toroid's AL value, and N is the number of turns.