How does the SF0603 series facilitate compact EMI filtering?

USB 3.x/4.0, LVDS, and other high-speed interfaces are rapidly becoming widespread in consumer electronics and communication equipment. The higher the transmission rate, the more sensitive the signal is to EMI noise – common-mode noise coupling onto differential signal lines can lead to eye diagram closure and increased bit error rate, or even data transmission interruption in severe cases. At the same time, internal device space is becoming increasingly compact, and common-mode chokes need to provide sufficient common-mode impedance within a smaller package without degrading differential-mode signals. The SF0603 series SMD common mode choke is precisely designed to provide a compact EMI filtering solution for this need.

Trend Requirements

• As USB 3.x/4.0 transmission rates increase, signal edges become steeper, and the common-mode noise band extends to higher frequencies

• LVDS differential signals are susceptible to common-mode interference during high-speed transmission

• Common-mode chokes need to provide sufficiently high impedance in the target frequency band to effectively suppress noise

Suitability of the SF0603 Series

• High common-mode impedance design effectively suppresses common-mode EMI noise

• The SMD toroidal structure combined with high-quality cores achieves stable common-mode suppression performance within a compact package

• Adapts to the EMI filtering requirements of USB and LVDS interfaces

Trend 2: Lower Differential-Mode Loss to Preserve Signal Integrity

Trend Requirements

• High-speed differential signals are sensitive to insertion loss and return loss, and any additional differential-mode loss can cause eye diagram closure

• Common-mode chokes must not significantly attenuate differential-mode signals while suppressing common-mode noise

• USB and LVDS interfaces have higher signal integrity requirements than traditional low-speed interfaces

Suitability of the SF0603 Series

• Low differential-mode signal loss preserves signal integrity

• Achieves a balance between common-mode suppression and differential-mode transmission, without affecting USB/LVDS data transmission

• Suitable for high-speed interface circuits with strict signal quality requirements

Trend Requirements

• Consumer electronic devices continue to miniaturise, with limited PCB space

• Common-mode chokes need to be laid out within a limited area

• High component density inside devices places higher demands on package size

Suitability of the SF0603 Series

• SMD toroidal structure for compact PCB layout

• Suitable for high-density placement, saving board space

• Adapts to the miniaturised design of consumer electronics and portable devices

Trend Requirements

• High-volume consumer electronics production requires components suitable for automated placement

• Manual soldering is inefficient and inconsistent, making it difficult to meet mass production requirements

• Components must be compatible with SMT production lines to improve production efficiency

Suitability of the SF0603 Series

• SMD package is suitable for automated SMT placement

• Improves production efficiency and placement consistency

• Adapts to the high-volume manufacturing requirements of consumer electronics

The SF0603 series SMD common-mode choke suppresses USB/LVDS common-mode noise with high common-mode impedance, preserves signal integrity with low differential-mode signal loss, adapts to compact PCB layouts and automated SMT placement with its SMD toroidal structure, and meets interface circuit requirements with a 250Vac working voltage and 1500Vac withstand voltage. It provides a compact EMI filtering solution for USB interfaces, LVDS communication interfaces, DC-DC converters, and consumer electronics.