Hero Section: The Solution

Headline:

Custom Toroidal Inductors: Superior EMI Filtering & Efficiency

Sub-headline:

Engineered for switching power supplies and output filtering. As a specialized Custom Inductor Manufacturer, we deliver Toroidal Inductors featuring closed-loop magnetic circuits that minimize leakage flux, offering exceptional EMI performance and high inductance stability.

Key Highlights:

Low EMI Radiation: The toroidal shape naturally confines the magnetic flux, making these Custom Inductors ideal for noise-sensitive audio and industrial applications.

Vertical Base Mounting: Designed with a robust plastic base for stable vertical installation, saving valuable PCB real estate.

High-Performance Cores: Utilizing Sendust (KSN) and Alloy Powder cores to ensure low core loss and soft saturation characteristics.

Request a Quote for Your Specs

Reference Case Study: Model RPI5816-681K-C

Note: The specifications below are from our production model RPI5816-681K-C. This demonstrates our manufacturing capability for Vertical Toroidal Inductors.

Parameter	Specification (Reference Only)	Customization Range
Model P/N	RPI5816-681K-C	Custom P/N assignment available
Category	Toroidal Inductor	Filter Choke / PFC Inductor
Dimensions	17.5 x 17.0 x 11.5 mm	Custom OD (e.g., 9mm - 100mm)
Inductance (L)	680 µH ± 10% (@1kHz)	10µH - 100mH (Precision ±5%)
DCR (Resistance)	300 mΩ Max	Optimized by wire gauge / Litz wire
Mounting	Vertical Base (2-Pin)	Horizontal / Flying Lead / Base
Core Material	KSN106060A (Sendust)	Sendust / Iron Powder / MPP / High Flux

Engineer's Insight: The RPI5816 is a classic Toroidal Inductor design optimized for filtering. By mounting the toroid vertically on a UL94-V0 base, we provide a rigid mechanical structure that withstands vibration while maintaining a standard 10mm pin pitch for easy integration.

Tailor This Inductor to Your Needs

We customize every aspect of the Toroidal Inductor to fit your circuit.

Core Material Selection

● Sendust (Kool Mµ): As used in the reference model, Sendust cores offer a great balance of low core loss and cost, making them perfect for PFC Chokes and switching regulators.

● Iron Powder: The most cost-effective solution for differential mode filtering where core loss is less critical.

● High Flux / MPP: For high-density applications requiring the highest DC bias capability and lowest losses.

Mechanical & Process Customization

● Mounting Options: As a versatile Custom Inductor Manufacturer, we offer Vertical Base (space-saving), Horizontal Base (low profile), or Flying Leads (flexible installation).

● Stabilization: We apply Varnish Impregnation or Glue Fixing (e.g., 3300 Black Glue) to prevent acoustic noise (humming) and secure the winding.

Industries We Serve

Typical applications for our Toroidal Inductors.

Power Supplies:

Output smoothing circuits in AC-DC and DC-DC converters.

Renewable Energy:

Inverters and micro-inverters requiring high-efficiency Power Inductors.

Audio & Video:

Noise filtering in amplifiers to ensure signal purity.

Industrial Control:

EMI suppression in motor drives and automation controllers.

Quality Assurance & Testing

Strict verification for every Custom Inductor.

Inductance Precision: 100% tested at specified frequencies (e.g., 1kHz/0.3V).
Turn Count Verification: Automatic winding machines ensure exact turns (e.g., 85Ts for RPI5816).
DCR Measurement: Resistance checks to ensure efficiency compliance.
Winding Direction: Strictly controlled (e.g., Clockwise) to ensure correct polarity.