N-channel MOSFETs offer rugged solution for VoIP

Diodes Incorporated has introduced a pair of N-channel MOSFETs, offering designers of Voice over Internet protocol (VoIP) communications equipment a more rugged solution.

The ZXMN15A27K and ZXMN20B28K are designed to meet the requirements of the primary switch position in transformer-based Subscriber Line Interface Circuits (SLIC) DC/DC converters in a variety of VoIP applications, including voice over broadband systems, PBX systems, cable and DSL gateways.

The devices feature breakdown voltages of 150 and 200V respectively and will withstand the high-pulse avalanche energy and commutation modes in the SLIC environment without the need for additional protection circuitry.

Combined with a transformer, the MOSFETs are capable of driving line voltages beyond 150V and supplying multiple subscriber lines at loop lengths exceeding 6km.

The low-input capacitance of these MOSFETs makes them easy to drive directly from the SLIC control IC with minimal or no buffering.

The ZXMN20B28K is also capable of low gate drive at logic level.

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