Infineon Technologies IRFU7440PBF

Overview

IRFU7440PBF from International Rectifier is a N-channel power MOSFET for switching, load-control, and power-conversion circuits supplied in the TO-251-3 Short Leads, IPAK, TO-251AA package. The device is intended for discrete power switching where board designers need a defined MOSFET package, gate-control interface, drain-source current path, and thermal path.

For engineers reviewing the IRFU7440PBF datasheet, IRFU7440PBF pinout, IRFU7440PBF application, or IRFU7440PBF equivalent, this device is commonly used in automotive load switching, motor control, relay and solenoid switching, DC-DC converter stages, battery power paths, and legacy power-board replacement. Selection should focus on channel polarity, drain-source voltage, continuous and pulsed current, RDS(on), gate charge, body-diode behavior, package thermal resistance, and footprint compatibility.

Technical Context

In circuit use, IRFU7440PBF serves as the main discrete switching element between the supply, load, or converter node and the power return or power rail.

The gate driver should be selected from the required gate voltage, total gate charge, switching speed, and EMI target. RDS(on), pulsed current, avalanche capability, and body-diode recovery define practical load and converter limits.

The IPAK / TO-251 package determines the board footprint, heat-spreading path, and current terminal arrangement. For replacement work, the package and pinout should be confirmed before assuming interchangeability with another IRF or AUIRF suffix.

Key Specifications

Pinout & Package

The IRFU7440PBF pinout should be checked together with the TO-251-3 Short Leads, IPAK, TO-251AA outline, because terminal arrangement and thermal connection affect layout, replacement approval, and assembly method.

For PCB design, keep the high-current power path short, route the gate or control line away from noisy switching nodes, and size copper or heatsinking for the real load current and duty cycle. IPAK short-lead package for board-mounted MOSFET power stages with compact through-hole style mounting.

Key Features

• IRFU7440PBF is a N-channel power MOSFET for power switching, load control, and converter-stage use.
• IPAK / TO-251 package affects footprint compatibility, thermal impedance, and assembly method.
• Low RDS(on), gate charge, and package thermal resistance are the main parameters for efficiency and temperature rise.
• Body-diode behavior and avalanche capability support inductive-load and synchronous-switching design checks.
• Can be driven from an external gate driver, controller, or logic stage when gate-drive voltage and timing are validated.
• Suitable for BOM continuation and replacement projects when footprint, pinout, and electrical ratings match the original board.

Applications

Equivalent & Alternatives

When evaluating IRFU7440PBF equivalent devices, engineers should compare only specific orderable part numbers and verify package footprint, pinout, voltage rating, current rating, thermal resistance, switching behavior, qualification status, and suffix or packing requirements before substitution.

Compared with related alternatives, IRFU7440PBF should remain the preferred sourcing reference when the existing BOM, PCB footprint, and qualification documentation require the exact International Rectifier orderable device.

Quality

IRFU7440PBF should be sourced as original International Rectifier / Infineon inventory through traceable and controlled supply channels. Quality verification may include package inspection, top-mark validation, label and lot review, solderability inspection, moisture-sensitivity handling review, and electrical screening according to the target production requirement.

Because IRFU7440PBF is used in power switching circuits, final validation should include the actual PCB footprint, thermal path, electrical stress, operating temperature, switching frequency, and fault-condition behavior. Traceable sourcing helps reduce counterfeit risk and supports repeatable performance in production, repair, and maintenance programs.

Availability

IRFU7440PBF available at Aetrix Electronics and suitable for power switching, power-conversion, motor-control, load-driver, repair, and BOM-continuity applications requiring stable component supply and controlled replacement planning.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for OEM manufacturers, repair programs, and electronics production teams.

For production or repair deployment, confirming package type, orderable suffix, lifecycle status, environmental requirement, electrical rating, thermal condition, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

International Rectifier was a semiconductor manufacturer known for power MOSFETs, IGBTs, gate drivers, power-management ICs, intelligent power switches, photovoltaic relays, and power modules. International Rectifier products became part of Infineon Technologies' power semiconductor portfolio after the acquisition of International Rectifier.

The IRFU7440PBF ordering line should be reviewed with the relevant International Rectifier legacy product family and current Infineon supply-chain references where available. This is especially important for legacy MOSFETs, IGBT devices, power modules, and automotive AUIR power devices.

FAQ

What is IRFU7440PBF used for?

IRFU7440PBF is used in MOSFET switching circuits such as load control, motor drive auxiliaries, DC-DC converter stages, battery power paths, and legacy power boards where its package and ratings match the design.

Where can I find the IRFU7440PBF datasheet download?

The IRFU7440PBF datasheet download is typically available from International Rectifier / Infineon documentation sources or authorized distributor documentation libraries. Use it to confirm ratings, package information, pinout, thermal data, and test conditions.

What should be considered in IRFU7440PBF pinout design?

IRFU7440PBF pinout design should confirm the package drawing, terminal functions, thermal path, high-current routing, gate or control routing, and whether the orderable suffix changes package or packing details.

Can IRFU7440PBF be used as a direct replacement?

IRFU7440PBF can be used as a direct replacement only when the package footprint, pinout, electrical ratings, thermal behavior, and qualification status match the original design.

What are common IRFU7440PBF equivalent solutions?

Common IRFU7440PBF equivalent directions include IRFH7440TRPBF, IRLU8729-701PBF, IRFU4105ZPBF-IR, IRLU3802PBF. Final selection must confirm package, footprint, voltage rating, current rating, thermal performance, and switching behavior.