High Current SMD Toroidal Common Mode Inductor STC08 Series 200µH-20mH for EMI/RFI Suppression

The STC08 series SMD toroidal common-mode inductor uses a high saturation core material and toroidal closed magnetic circuit structure. It effectively reduces EMI radiation and is suitable for EMI-sensitive power and signal line filtering applications. The inductance range covers 200µH to 20mH. The SMD package supports automated placement, compatible with SMT production lines. It is widely used in electronic appliances, DC-DC conversion (parallel mode), isolation coupling, input filtering (series mode), and EMI/RFI suppression.

• Inductance range – 200µH to 20mH, flexible selection

• Rated current – 1A to 7A, high current capacity

• DCR – 8mΩ to 250mΩ, low loss

• High saturation core material

• Low EMI radiation

• SMD package – supports automated placement

• Operating temperature – -40°C to +125°C

• Insulation resistance – ≥1000MΩ (100V DC)

Inductance measure at 100KHz 0.1VRms.

Insulation Resistance: 100Vdc 1KMΩmin.

RDC:QuadTech 1880 Milliohmmeter

Operating temperature:-40℃ to +125℃

Storage Temperature: -55℃ to +125℃

Different package available per special request

Max of 35% saturation on DC bias applied

Note: Product specifications can be customized.

• Electronic appliance power filtering

• DC-DC conversion (parallel mode)

• Isolation coupling (transformer)

• Input filtering (series mode)

• EMI/RFI suppression

• Communication equipment power supplies

• Industrial control power supplies

• Computer peripheral power supplies

Q: What are the inductance, current, and DCR ranges of the STC08 series?

A: The STC08 series covers an inductance range from 200µH to 20mH, rated current from 1A to 7A, and DCR from 8mΩ to 250mΩ. The wide inductance range, high current capacity, and low DCR design make it suitable for various EMI suppression applications, from signal line filtering to high-power power line filtering.

Q: What is the significance of low DCR for common-mode inductors?

A: Low DCR means less power loss (I²R loss) when current passes through the winding. This helps improve overall system efficiency and reduce temperature rise. The STC08 series offers DCR as low as 8mΩ, making it especially suitable for high-current power designs with strict efficiency requirements.

Q: How to apply for samples? What is the lead time?

A: You can submit a sample application through our website or email. Please provide your company information and target model. Samples are free of charge and will be shipped within 3-5 working days. Mass order lead time is generally 2-8 weeks.