FDU2572 Equivalent & Substitute Parts

Part Overview

The FDU2572 is an N-Channel MOSFET manufactured by onsemi, rated for 150V drain-to-source voltage with continuous drain current of 4A at Ta and 29A at Tc. This device features the PowerTrench® technology platform and is housed in a TO-251-3 (I-PAK) through-hole package. The FDU2572 is classified as obsolete, necessitating identification of equivalent substitute components for ongoing applications and new designs. Substitute parts must maintain functional compatibility across voltage ratings, current handling, thermal characteristics, and package form factors.

Substiute Parts

FDU2572

onsemiIn Stock: 15278FDU2572 Datasheet

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IRLU120NPBF

Infineon TechnologiesIn Stock: 15473IRLU120NPBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDU2572 is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute must support a minimum Vdss rating equal to or greater than 150V to ensure safe operation in the original application circuit.

Current Handling Capacity: The substitute must provide continuous drain current (Id) sufficient for the application. The FDU2572 delivers 29A at Tc; substitutes with lower current ratings require circuit re-evaluation.

On-State Resistance (Rds On): Lower Rds On values reduce power dissipation and heat generation. Substitutes with higher Rds On values increase thermal load and may require thermal management adjustments.

Package and Mounting: The FDU2572 uses TO-251-3 (I-PAK) through-hole packaging. Substitutes must use identical or mechanically compatible package types to ensure PCB compatibility without redesign.

Operating Temperature Range: The substitute must support the full operating temperature range of -55°C to 175°C (TJ) to maintain performance across environmental conditions.

Gate Charge and Input Capacitance: These parameters affect switching speed and drive circuit requirements. Substitutes with significantly different values may require drive circuit optimization.

Parameter Comparison

Engineering Selection Recommendations

IRLU120NPBF Substitution Limitations:

The IRLU120NPBF presents significant parameter deviations that restrict its use as a direct substitute for the FDU2572:

Voltage Rating Reduction: The IRLU120NPBF is rated for 100V Vdss, compared to the FDU2572's 150V rating. This 33% reduction in voltage capability disqualifies this device for applications requiring the full 150V rating. Use of the IRLU120NPBF in circuits designed for 150V operation creates risk of device failure and circuit malfunction.

Current Capacity Reduction: The IRLU120NPBF provides 10A continuous drain current at Tc, versus the FDU2572's 29A. This 66% reduction in current handling capacity limits the IRLU120NPBF to lower-power applications only.

Power Dissipation Limitation: The IRLU120NPBF is rated for 48W maximum power dissipation at Tc, compared to the FDU2572's 135W. This significant reduction restricts thermal headroom and may require circuit modifications or additional cooling measures.

On-State Resistance Increase: The IRLU120NPBF exhibits 185 mOhm Rds On versus the FDU2572's 54 mOhm. The 3.4× increase in on-state resistance results in higher conduction losses and increased heat generation.

Product Status Consideration: The IRLU120NPBF carries a "Not For New Designs" status, indicating limited long-term availability and manufacturer support. For new applications, alternative components with active product status should be prioritized.

Compliance Status: The IRLU120NPBF is ROHS3 compliant, providing regulatory advantage for applications subject to RoHS requirements. Both devices maintain REACH Unaffected status.

Substitution Applicability: The IRLU120NPBF is suitable only for applications where the circuit operates at voltages below 100V, requires drain currents below 10A, and can tolerate increased on-state resistance and reduced power dissipation capability. Direct substitution in existing FDU2572 designs is not recommended without comprehensive circuit re-evaluation and thermal analysis.

Frequently Asked Questions (FAQ)

Q: Can the IRLU120NPBF directly replace the FDU2572 in existing designs?

A: No. The IRLU120NPBF has a lower voltage rating (100V vs. 150V), reduced current capacity (10A vs. 29A), and significantly higher on-state resistance (185 mOhm vs. 54 mOhm). Direct substitution is not recommended without circuit redesign and thermal re-analysis.

Q: What is the primary limitation of using IRLU120NPBF as a substitute?

A: The voltage rating reduction from 150V to 100V is the primary limitation. Applications requiring the full 150V rating cannot use the IRLU120NPBF without risking device failure.

Q: Are the packages mechanically compatible?

A: Yes. Both the FDU2572 and IRLU120NPBF use the TO-251-3 (I-PAK) through-hole package with identical mechanical dimensions. PCB layout modifications are not required for package compatibility.

Q: What does "Not For New Designs" status mean for the IRLU120NPBF?

A: This status indicates that the manufacturer is not recommending this device for new product development. Availability may be limited, and manufacturer support may be reduced. For new designs, components with active product status should be selected.

Q: How does the increased on-state resistance of the IRLU120NPBF affect circuit performance?

A: The 3.4× higher on-state resistance (185 mOhm vs. 54 mOhm) increases conduction losses and heat generation. In high-current applications, this results in higher junction temperatures and reduced thermal margin. Thermal management must be re-evaluated if substitution is considered.

Q: Are there compliance differences between the two devices?

A: The IRLU120NPBF is ROHS3 compliant, while the FDU2572 compliance status is not specified. Both devices are REACH Unaffected. For applications subject to RoHS requirements, the IRLU120NPBF provides regulatory compliance advantage.

Q: What operating temperature range do both devices support?

A: Both the FDU2572 and IRLU120NPBF support the identical operating temperature range of -55°C to 175°C (TJ). Temperature range compatibility is not a limiting factor for substitution evaluation.

Q: Can the IRLU120NPBF be used in lower-voltage applications originally designed for the FDU2572?

A: Yes, provided the application operates below 100V and requires drain currents below 10A. The IRLU120NPBF is suitable for applications that do not require the full voltage and current capabilities of the FDU2572. Circuit validation and thermal analysis are required.