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Common-mode choke

Small footprint

Epcos, part of TDK, offers common-mode chokes, which are approximately 45 percent smaller than the predecessors. They are rated for an operating temperature range from -55 °C to +150 °C.

The ACT1210 common-mode choke measures 3,2 mm x 2,5 mm x 2,4 mm (Photo: TDK Epcos)

COMMON-MODE CHOKES ARE USED IN CAN networks to improve system, reliability with respect to electromagnetic compatibility (EMC). CAN-connected devices emit electromagnetic interferences (EMI), which can be suppressed by means of common-mode chokes. They also help to increase immunity of the CAN transceiver to electromagnetic disturbances on the bus lines.

The ACT1210 series of common-mode chokes are manufactured using an automatic winding process. The mass production of the components, which are qualified to AEC-Q200, started beginning of this year. The series has joined the ACT45B series for CAN.

Some chipmakers have launched CAN transceiver (e.g. NXP and Freescale), which don’t need common-mode chokes. Volkswagen has approved the Mantis transceivers by NXP for use in its cars. These chips are chokeless, meaning they don’t require common-mode chokes.