STU80N4F6 Equivalent & Substitute Parts

Part Overview

The STU80N4F6 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 40V drain-to-source voltage with 80A continuous drain current at 25°C (Tc). The device is packaged in TO-251 (IPAK) through-hole configuration and is designed for high-current switching applications. The STU80N4F6 carries an obsolete product status, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

STU80N4F6

STMicroelectronicsIn Stock: 3214STU80N4F6 Datasheet

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AOI4184

Alpha & Omega Semiconductor Inc.In Stock: 10147AOI4184 Datasheet

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IRFU7440PBF

Infineon TechnologiesIn Stock: 20350IRFU7440PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STU80N4F6 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Drain-to-Source Voltage (Vdss) must equal or exceed 40V
• Continuous Drain Current (Id) must meet or exceed 80A at 25°C (Tc)
• Gate-to-Source Voltage (Vgs) maximum rating must be ±20V or greater
• Operating temperature range must encompass -55°C to 175°C (TJ)

Mechanical Compatibility Requirements:

• Mounting type must be Through Hole
• Package must be TO-251 or IPAK variant (TO-251AA, TO-251A acceptable)
• Pin configuration must be compatible with TO-251-3 lead count

Regulatory Compliance:

• RoHS3 compliance required
• REACH Unaffected status required
• ECCN classification EAR99

The substitute parts listed below satisfy all electrical and mechanical compatibility criteria while maintaining regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

AOI4184 Substitution: The AOI4184 is an active product from Alpha & Omega Semiconductor Inc. with identical 40V Vdss rating. The continuous drain current rating of 50A (Tc) is lower than the STU80N4F6 specification of 80A. This part is suitable for applications where the required drain current does not exceed 50A. The AOI4184 exhibits lower on-state resistance at 20A (8mOhm) compared to the STU80N4F6 at 40A (6.3mOhm), and lower gate charge (33nC versus 36nC), resulting in reduced switching losses in lower-current applications. The TO-251A package variant uses stub leads rather than short leads, requiring verification of PCB layout compatibility. RoHS3 compliance and REACH Unaffected status are maintained.

IRFU7440PBF Substitution: The IRFU7440PBF is manufactured by Infineon Technologies and rated for 40V Vdss with 90A continuous drain current (Tc), exceeding the STU80N4F6 specification. This part is suitable for applications requiring equal or higher current capacity. The IRFU7440PBF demonstrates superior on-state resistance of 2.4mOhm at 90A (10V), providing lower conduction losses. However, the gate charge is significantly higher at 134nC compared to 36nC for the STU80N4F6, resulting in increased switching losses and higher gate drive requirements. The input capacitance is also elevated at 4610pF versus 2150pF. Power dissipation capability is 140W (Tc), substantially higher than the STU80N4F6 at 70W. The IRFU7440PBF carries obsolete product status. The IPAK (TO-251AA) package with short leads is mechanically compatible. RoHS3 compliance and REACH Unaffected status are maintained.

Frequently Asked Questions (FAQ)

Q: Can the AOI4184 be used as a direct replacement for the STU80N4F6?

A: The AOI4184 is electrically compatible with the STU80N4F6 for applications requiring continuous drain current up to 50A. Both devices share identical 40V Vdss rating, ±20V Vgs maximum, and -55°C to 175°C operating temperature range. The AOI4184 is an active product, providing supply continuity advantages over the obsolete STU80N4F6. However, applications requiring continuous drain current above 50A must use the IRFU7440PBF or equivalent higher-current device. PCB layout verification is required due to TO-251A stub lead configuration differences.

Q: What are the key differences between the IRFU7440PBF and STU80N4F6?

A: Both devices are rated for 40V Vdss and share identical operating temperature range. The IRFU7440PBF provides higher continuous drain current (90A versus 80A) and superior on-state resistance (2.4mOhm at 90A versus 6.3mOhm at 40A). The IRFU7440PBF exhibits significantly higher gate charge (134nC versus 36nC) and input capacitance (4610pF versus 2150pF), requiring higher gate drive power and potentially increasing switching losses. Power dissipation capability is doubled (140W versus 70W). Both parts use compatible IPAK packaging. The IRFU7440PBF is suitable for high-current applications where conduction losses dominate over switching losses.

Q: Are there package compatibility concerns between these substitute parts?

A: All three parts use TO-251 or IPAK variants with three-lead through-hole configuration. The STU80N4F6 and IRFU7440PBF use short leads (TO-251 and TO-251AA respectively), while the AOI4184 uses stub leads (TO-251A). Stub lead variants may require PCB layout adjustment due to reduced lead length. Pin assignment (Gate, Drain, Source) is standard across all three parts. Mechanical fit verification is recommended when transitioning between short-lead and stub-lead variants.

Q: Which substitute part should be selected for new designs?

A: The AOI4184 is the recommended choice for new designs due to its active product status, ensuring long-term supply availability and manufacturer support. The AOI4184 is suitable for applications with continuous drain current requirements up to 50A. For applications requiring continuous drain current above 50A, the IRFU7440PBF provides the necessary current capacity, though its obsolete status may limit future availability. Both substitute parts maintain full RoHS3 compliance and REACH Unaffected status.

Q: What is the impact of higher gate charge in the IRFU7440PBF?

A: Gate charge of 134nC in the IRFU7440PBF versus 36nC in the STU80N4F6 requires proportionally higher gate drive current and energy to achieve the same switching speed. This results in increased switching losses and higher power consumption in the gate drive circuit. Applications with frequency-dependent switching losses or limited gate drive capability may experience performance degradation with the IRFU7440PBF. Thermal analysis is recommended when substituting with this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the AOI4184 and IRFU7440PBF are RoHS3 compliant and REACH Unaffected, matching the compliance status of the STU80N4F6. All three parts carry EAR99 ECCN classification and 8541.29.0095 HTSUS code.