5-Pack T37-6 Iron Powder Toroid Core 9.5mm AL=3nH/N² RF HF
5-Pack T37-6 Iron Powder Toroid Core 9.5mm AL=3nH/N² RF HF
5-Pack T37-6 Iron Powder Toroid Cores – High-Frequency RF Performance
Get reliable inductance performance across a wide frequency range with these T37-6 iron powder toroid cores. Ideal for RF circuits, amateur radio projects, filter coils, and DIY electronics, these compact cores deliver consistent permeability and low-loss characteristics in the 40–400 MHz range. Made in Mainland China.
Key Specifications
- Model: T37-6
- Material: Iron powder core
- Color/Coating: Yellow Gray
- External Diameter: approx. 9.5 mm
- Inside Diameter: approx. 5.2 mm
- Thickness: approx. 3.3 mm
- Inductance Coefficient (AL): 3.0 nH/N²
- Permeability: ~8.5 μo
- Frequency Range: 40–400 MHz
- Quantity: 5 pieces per pack
Why Choose These Toroid Cores?
- Consistent Inductance: AL value of 3.0 nH/N² ensures predictable coil calculations for RF and HF designs.
- Wide Frequency Range: Optimized for 40–400 MHz, suitable for a broad spectrum of RF and communication applications.
- Compact Toroidal Form: The donut-shaped design minimizes electromagnetic interference and maximizes flux containment.
- Durable Coating: Yellow-gray epoxy coating protects the core and aids in material identification (Mix 6 iron powder).
- Versatile Use: Perfect for home-brew radio transmitters, receivers, impedance matching networks, low-pass filters, and more.
Important Notes
- Dimensions are in millimeters (mm) with a tolerance of ±0–2 mm.
- Please verify all dimensions against your design requirements before purchasing.
- Toroid cores are fragile ceramic-composite components — handle with care during winding and installation.
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Frequently Asked Questions
Q: What is the T37-6 iron powder toroid core used for?
A: The T37-6 iron powder toroid core is widely used in RF and HF electronic circuits, including amateur radio coil winding, impedance matching transformers, band-pass and low-pass filters, and oscillator circuits. Its Mix 6 composition (yellow-gray coating) makes it especially suited for frequencies in the 40–400 MHz range.
Q: How many turns do I need to wind for a specific inductance value?
A: With an inductance coefficient (AL) of 3.0 nH/N², you can calculate the number of turns using the formula: N = √(L / AL), where L is your target inductance in nanohenries. For example, to achieve 300 nH, you would need approximately 10 turns.
Q: Are these cores fragile? How should I handle them?
A: Yes, iron powder toroid cores are brittle and should be handled carefully. Avoid dropping or applying mechanical stress during winding. Use appropriate winding wire tension to prevent cracking. If you have any concerns about a received core, contact us for assistance.
Q: What does the yellow-gray coating indicate?
A: The yellow-gray coating identifies these as Mix 6 iron powder material, a standard color-coding convention in the toroid core industry. Mix 6 cores are optimized for high-frequency RF applications, distinguishing them from other mixes such as Mix 2 (red) or Mix 26 (yellow-white).
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.