Low Interwinding Capacitance Common Mode Choke STR0903 Series UL94-V0 for Common-Mode Interference Suppression

The STR0903 series SMD toroidal common-mode inductor uses a split-winding and single-layer winding design. It offers extremely low inter-winding capacitance and provides the highest common-mode impedance across a wide frequency range (50Hz-500KHz), delivering excellent common-mode interference suppression performance. The product has approximately 0.8% leakage inductance, which also provides some differential-mode suppression capability. The SMD package supports vapour phase soldering and infrared reflow soldering, with soldering heat resistance of 260°C/10 seconds. It is widely used in compact electronic ballasts, switching power supplies, and various common-mode interference suppression applications.

• Split winding – lowest inter-winding capacitance
• Single-layer winding – highest common-mode impedance
• Frequency range – 50Hz to 500KHz
• Leakage inductance – approximately 0.8% (differential-mode suppression)
• Meets UL/CSA/IEC safety standards
• Material flammability rating – UL94-V0
• Operating voltage – 250VAC
• Operating temperature – -40°C to +105°C

• Suppression of common-mode interferences
• Compact electronic ballasts in lamps
• Compact switch-mode power supplies

• Operating voltage: 250Vac
• IDC Max:Determined when superimposed
• lnductance test: HP4284A 10KHz 0.1V
• RDC:QuadTech 1880 Milliohmmeter
• Operating temperature: -40℃ to +105℃
• Storage Temperature: -40℃ to +105℃
• Temperature rise 40℃ Max
• Solder methods: Vapor Phase, Infrared Reflow
• Resistance to soldering heat:260℃ for 10 seconds
• Solvent resistance: Conforms to MIL-STD-202E