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IR power MOSFETs increases safety margin

Posted: 03 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:international rectifier? hexfe? power mosfet? irf3805s-7p? irf1405zs-7p?

International Rectifier (IR) introduced a pair of new 55V-rated Q101-qualified automotive HEXFET power MOSFETs rated for continuous duty in the D2Pak outline.

The latest addition to the recently-introduced 40V devices, these new products are designed to increase safety margin in specific circuitry and load topologies where the higher voltage rating would handle load-dump transients on the battery line, or transients caused by loads with strong inductive nature.

The IRF3805S-7P (160A continuous) and IRF1405ZS-7P (120A continuous) MOSFETs are targeted for use in heavy-duty, high-current automotive applications such as electronic power steering (EPS), 14V integrated starter alternator (ISA) systems and advanced alternator active rectification.

A standard three-lead D2Pak is limited to 75A to 100A, depending on lead cross-section and manufacturer's specification method; however, these devices have seven leads. According to IR, the additional leads allow a larger wirebond area, reducing die-free package resistance, enabling a device on-resistance specification of 2.6 m? (max) at 25C (IRF3805S-7P).

"The new 55V-rated Q101 HEXFET MOSFETs increase the selection of devices so that designers can choose the most suitable power switch for their high-current automotive application," shared Technical Marketing Manager Anthony Murray.

The press release also said that the IRF2804S-7P and the IRF1405ZS-7P are ideal replacements for multiple D2Pak devices as well as larger through-hole package devices. In addition, repetitive avalanche (Ear) is characterized on the data sheet and guaranteed up to maximum junction temperature (Tj-max), especially useful for automotive applications.

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