T37-6 Iron Powder Toroid Core AL 3nH/N² – 5 Pack

T37-6 Iron Powder Toroid Cores – Pack of 5

Upgrade your electronics projects with these precision-engineered T37-6 Iron Powder Toroid Cores. Designed for reliable inductance performance in RF circuits, filters, and power electronics, each core delivers consistent electromagnetic properties in a compact, easy-to-wind toroidal form factor. Their distinctive yellow-gray coating makes identification straightforward, while the iron powder composition ensures excellent frequency stability and low core loss across a wide range of applications.

Key Specifications

• Model: T37-6 Iron Powder Toroid Core
• Outside Diameter: Approx. 9.5mm
• Inside Diameter: Approx. 5.2mm
• Height: Approx. 3.3mm
• Inductance Coefficient (AL): 3 nH/N²
• Permeability (μ): Approx. 8.5μo
• Material: Iron powder core
• Color/Coating: Yellow-gray
• Core Type: Toroid (dust core / ferrite-style powder core)
• Quantity: 5 pieces per pack

Why Choose T37-6 Iron Powder Cores?

• Stable Inductance: Iron powder construction provides consistent AL values, making winding calculations predictable and repeatable.
• Low Core Loss: Optimized for use at higher frequencies with minimal energy dissipation, ideal for RF and switching circuits.
• Compact Toroidal Design: The toroid shape minimizes electromagnetic interference and self-shields the magnetic field, reducing stray coupling.
• Durable Coating: The yellow-gray epoxy coating protects the core and aids in color-coded identification for quick selection on your workbench.
• Versatile Application: Suitable for amateur radio (ham radio) inductors, switch-mode power supply (SMPS) filters, EMI suppression chokes, and general electronics prototyping.

Common Applications

• RF inductors and bandpass filters
• Amateur / ham radio antenna tuners and baluns
• Switch-mode power supply (SMPS) choke coils
• EMI/RFI noise suppression filters
• Electronics hobbyist and prototyping projects

For more information on electromagnetic components and their safe use in electronic circuits, visit the NIST Electromagnetic Metrology Program.

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 inductors, amateur radio circuits, switch-mode power supplies, EMI suppression filters, and general electronics prototyping. Its compact toroidal form factor and stable inductance coefficient (AL = 3 nH/N²) make it a popular choice for precision winding applications across a broad frequency range.

Q: What do the T37-6 specifications mean?

A: "T37" refers to the toroid core size — approximately 9.5mm outer diameter, 5.2mm inner diameter, and 3.3mm height. The "-6" denotes the material mix (Mix 6), which is an iron powder blend optimized for frequencies from approximately 10 MHz to 50 MHz, with an inductance coefficient (AL) of 3 nH per turn squared and a permeability of approximately 8.5μo. The yellow-gray coating is the standard color code for Mix 6 cores.

Q: How do I calculate the number of turns needed for a specific inductance with this core?

A: You can use the formula: N = √(L / AL), where L is the desired inductance in nanohenries (nH) and AL = 3 nH/N² for this core. For example, to achieve 270 nH, you would wind approximately √(270 / 3) = √90 ≈ 9.5, so about 10 turns. Always verify with an LC meter after winding for best accuracy.

Q: How many cores are included in this listing?

A: This listing includes 5 pieces of T37-6 iron powder toroid cores, giving you extras for prototyping, testing, or multiple projects.