DLP31SN121SL2L Filters

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Common mode chokes are components that use magnetic fields to filter high frequency currents in power supplies and other similar applications. The DLP31SN121SL2L is an example of such a device. This particular component is a single-ended instrumentation grade common mode choke.

The intended application for the DLP31SN121SL2L is power line filter circuits, providing protection against differential and common mode line currents. The device is capable of handling high selective voltage differential over a wide frequency range, allowing it to filter out noise from the power supply and reducing the risk of high frequency interference.

The working principle behind common mode chokes is that they act as inductors, creating a magnetic field by passing current through a coil of wire. The field blocks any current travelling counter to the direction of the coil, meaning any external noise added to the power supply is filtered out, whilst allowing the main current to pass through unimpeded. The strength of the filter depends on the number of turns in the coil, with more turns providing a more effective filter.

The DLP31SN121SL2L has a high temperature, UL94V-0 rated bobbin, which provides good electrical insulation at high levels of current. Its coil has 120 turns of 40 AWG copper wire, and has a rated nominal impedance of 120 Ω at 100Hz and 0.47 μH inductance, providing excellent filtering capabilities.

The internal construction of the device is robust, with its magnetic strip wound tightly around a metal core surrounded by a layer of insulation. This insulation allows for the unit to be used safely in circuits with high voltage fluctuations. The component also has a standard footprint of 18.5x12.5mm, allowing it to easily fit into a variety of projects and applications.

The DLP31SN121SL2L is well suited to filtering out high frequency noise from power supplies. Its high quality construction and 120 turn coil provide excellent noise suppressing capabilities, allowing it to operate safely in the presence of high voltages and currents. This makes it an ideal component for power line filter circuits.

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