SCM2012FS670MDG Common Mode Choke for Signal Line EMI Filtering

ElecSuppliers Part Number GuideAug 22, 2026

SCM2012FS670MDG is a common mode choke from INPAQ Technology designed for signal-line EMI filtering. The component provides two signal lines in a compact surface-mount package and is intended to suppress common mode noise while allowing the desired differential signal to pass through the circuit.

The device belongs to the SCM2012FS series and combines a 67 Ω impedance at 100 MHz with a maximum current rating of 400 mA. Its compact 2.00 mm × 1.20 mm footprint makes it suitable for space-constrained electronic designs.

SCM2012FS670MDG Key Specifications

SCM2012FS670MDG is a two-line common mode choke with an impedance of 67 Ω at 100 MHz. The maximum current rating is 400 mA and the maximum DC resistance is 250 mΩ.

The component has a 50 V DC voltage rating and an operating temperature range of -25°C to +125°C.

It uses a surface-mount horizontal configuration with four PCB pads. The maximum component height is approximately 1.40 mm, making it suitable for compact PCB assemblies.

How a Common Mode Choke Works

A common mode choke is primarily used to reduce unwanted common mode electromagnetic interference on signal or power lines.

In a two-line configuration, the desired differential signal travels through the two conductors in opposite directions. The magnetic fields generated by the normal differential current tend to cancel each other, allowing the intended signal to pass with relatively low interference.

When unwanted common mode noise appears on both lines in the same direction, the magnetic fields reinforce each other. The choke therefore presents a higher impedance to this unwanted noise and helps attenuate it.

This makes common mode chokes useful in communication interfaces, data lines and other circuits where electromagnetic interference needs to be controlled.

67Ω Impedance at 100MHz

The 67 Ω impedance specification of SCM2012FS670MDG is specified at 100 MHz.

This value provides a reference for the component's noise-suppression behavior at high frequency. It should not be interpreted as a fixed 67 Ω resistance in the DC circuit.

Common mode choke impedance varies with frequency, so engineers need to consider the actual frequency spectrum of the interference they are trying to suppress.

For a circuit experiencing noise around or near the 100 MHz region, the 67 Ω specification can provide a useful starting point when selecting the filter component.

SCM2012FS670MDG Current Rating

The maximum current rating is 400 mA.

Current rating is an important parameter when selecting a common mode choke because excessive current can increase temperature and cause additional losses through the winding resistance.

SCM2012FS670MDG has a maximum DC resistance of 250 mΩ. The resistance of the winding contributes to voltage drop and power dissipation, so the actual operating current should be evaluated together with the surrounding circuit conditions.

The 400 mA rating should therefore be considered together with ambient temperature, PCB thermal conditions and the continuous or transient nature of the applied current.

SCM2012FS Series

SCM2012FS670MDG is part of the INPAQ SCM2012FS series.

The series includes multiple impedance and current configurations, allowing engineers to select a common mode choke according to the frequency characteristics of the noise and the current requirements of the circuit.

Different SCM2012FS part numbers can have significantly different impedance, current and DC resistance values. The complete part number should therefore be checked carefully instead of selecting another component simply because it belongs to the same series.

SCM2012FS670MDG Package

The component uses a compact 2.00 mm × 1.20 mm surface-mount package with a maximum height of approximately 1.40 mm.

The four-pad configuration provides connections for the two signal lines passing through the common mode choke.

Its compact dimensions are useful for modern PCB designs where available board space is limited. The component can be placed close to the connector or interface being protected, which can help reduce the length of the noise-sensitive signal path.

SCM2012FS670MDG Applications

SCM2012FS670MDG can be used in signal-line EMI filtering applications across consumer electronics, industrial equipment, communication systems and embedded electronic products.

Typical applications include data interfaces, signal connections, communication lines and other circuits where common mode noise needs to be reduced.

The component can be particularly useful when a PCB needs additional EMI suppression without significantly increasing board size.

The correct component should be selected based on the interface signal characteristics, common mode noise frequency, maximum current and required insertion-loss performance.

PCB Layout Considerations

The location of a common mode choke can have a significant influence on its effectiveness.

When the component is used to suppress noise entering or leaving a PCB through a connector, placing it close to the connector can help prevent unwanted noise from traveling further into the board.

The signal traces should also be routed carefully around the component. Unnecessary parallel routing or long traces after the filtering point can create additional coupling paths that reduce the effectiveness of the EMI filter.

Engineers should follow the recommended PCB footprint and maintain appropriate spacing around the component during layout.

SCM2012FS670MDG Replacement Considerations

When replacing SCM2012FS670MDG, the most important parameters include the number of lines, impedance, current rating, DC resistance, voltage rating and package dimensions.

A replacement with a higher impedance is not automatically better. If the component is used on a high-speed signal line, excessive impedance or parasitic effects can affect signal integrity.

Likewise, a component with the same impedance but a lower current rating may not be suitable for the application.

The complete electrical characteristics should therefore be compared before selecting an alternative.

SCM2012FS670MDG Availability

SCM2012FS670MDG is currently listed as an active INPAQ Technology product by major electronic component distributors. Current distribution listings also show the component as available in tape-and-reel packaging.

For production purchasing, buyers should still verify the latest inventory, standard package quantity and lead time because distributor stock can change quickly.

The exact manufacturer part number should be used when sourcing the component to avoid confusion with other SCM2012FS variants.

SCM2012FS670MDG for EMI Protection

SCM2012FS670MDG combines a 67 Ω common mode impedance at 100 MHz, 400 mA current capability and a compact 2.00 mm × 1.20 mm surface-mount package.

Its two-line configuration makes it suitable for signal-line EMI suppression where board space is limited. The component can be incorporated into communication and electronic interface circuits to help reduce unwanted common mode noise.

For new designs, engineers should evaluate the noise frequency, signal bandwidth, current, DC resistance and PCB placement together. Selecting the right common mode choke is not only about the impedance value; the complete electrical behavior of the signal path needs to be considered.