FT-240-31 / 2631803802 Ferrite Toroid Core, µi=1500, for EMI filters and RF baluns

Technical Features

The MagWave T1Y-240/050 is a 2.4-inch ferrite toroidal core from the T1Y series, designed for broadband RF applications, EMI/RFI suppression, and impedance transformer construction. Manufactured using 1Y (31) ferrite material with an initial permeability of 1500, it is particularly suitable for common-mode chokes, baluns, and RF transformers operating in the lower HF frequency bands. This model is a technical alternative to the Fair-Rite 2631803802 and Amidon FT240-31.

• Applications:
  • EMI/RFI Suppression (1 MHz – 500 MHz)
  • Broadband RF Transformers (1 MHz – 300 MHz)
  • Power Transformers (0.5 MHz – 30 MHz)
  • Common-mode Chokes and HF Baluns
• Ferrite material: Mix 1Y (31)
• Initial permeability: 1500 µi (±25%)
• Dimensions: outer diameter 61 mm, inner diameter 35.55 mm, height 12.7 mm
• AL (nH/N²): 2053 ±25%
• Impedance (10 turns): >30 Ω @ 10 MHz, >46 Ω @ 25 MHz, >88 Ω @ 100 MHz
• Saturation magnetic flux density: 360 mT
• Curie temperature: above 90 °C
• Environmental compliance: RoHS and REACH compliant, according to the product datasheet

Benefits

• Excellent low-frequency performance: high permeability makes this ferrite particularly suitable for lower HF bands and broadband applications
• Effective noise suppression: helps reduce common-mode currents and unwanted RF interference over a wide frequency range
• Versatility: suitable for End Fed, OCF antennas, common-mode chokes, and 1:1, 4:1, and 9:1 transformer designs
• High inductance factor: allows significant inductance to be achieved with relatively few winding turns
• Robust construction: suitable for demanding RF applications when operated within the material's electrical and thermal limits

Amidon FT240-31, Fair-Rite 2631803802 and others: what is the difference?

The 2.4-inch (61 mm) ferrite toroid made from Mix 31 material is available from several manufacturers and suppliers, including Amidon, Fair-Rite, and MagWave. These products share similar nominal dimensions and magnetic characteristics, making them suitable alternatives for many RF and EMI suppression applications.

However, differences in manufacturing processes, material tolerances, inductance factors, and impedance characteristics may affect performance in specific circuits. For this reason, compatibility should be evaluated according to the electrical requirements of each application.

Our MagWave™ model stands out as a reliable and cost-effective alternative, offering:

• Consistent manufacturing quality
• Mix 31 material characteristics suitable for broadband RF and EMI suppression applications
• Standard 2.4-inch dimensions compatible with widely used FT240-31 core formats
• Excellent price-performance ratio for hobbyist and professional RF projects

Choose MagWave™ for a dependable, versatile, and cost-effective ferrite solution for RF transformers, baluns, and common-mode chokes.

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