A common mode choke is an electromagnetic component that blocks high frequencies by passing direct currents (DC) and alternating currents (AC) through an electrical circuit.
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What is the difference between a common mode choke and transformer? A common-mode choke is a sort of hybrid where the inductance is used to suppress common-mode signals, but the transformer action allow normal-mode signals to readily pass. The difference is basically in usage. A choke uses the inductance as a primary characteristic to affect a signal. In a transformer the inductance is secondary and is just to establish the magnetizing current with the transformer’s primary purpose being to transform one signal level (or impedance) to another.
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The choke normally consists of insulated wire that is wound around a magnetic core. It is an inductor that is utilized to block high-frequency, alternating current (AC) in a circuit while allowing lower frequencies, or direct current (DC), through.
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A common-mode choke has 4 pins. A common-mode choke is typically drawn as two inductors separated by two lines. The two lines represent the inductive coupling between the two inductors.
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CAN Common Mode Choke?

Common Mode Chokes
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