IRFS4615PBF N-Channel 150V 33A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFS4615PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 150V drain-to-source voltage with 33A continuous drain current at 25°C. The device is housed in a D2PAK (TO-263-3) surface mount package and is designed for high-current switching applications. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

IRFS4615PBF

Infineon TechnologiesIn Stock: 1274IRFS4615PBF Datasheet

Current PartRFQ

AOB254L

Alpha & Omega Semiconductor Inc.In Stock: 10209AOB254L Datasheet

MFR RecommendedRFQ

IXTA56N15T

IXYSIn Stock: 763IXTA56N15T Datasheet

MFR RecommendedRFQ

IXTA62N15P

IXYSIn Stock: 1439IXTA62N15P Datasheet

MFR RecommendedRFQ

PHB45NQ15T,118

Nexperia USA Inc.In Stock: 16590PHB45NQ15T,118 Datasheet

MFR RecommendedRFQ

STB75NF20

STMicroelectronicsIn Stock: 1438STB75NF20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRFS4615PBF is determined by the following critical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must be ≥150V
• Continuous Drain Current (Id): Must be ≥33A at 25°C (Tc rating)
• Package Type: D2PAK (TO-263-3) or compatible surface mount package
• Operating Temperature Range: Must support -55°C to 175°C
• RoHS3 Compliance and REACH Unaffected status

Secondary Compatibility Parameters:

• On-State Resistance (Rds On): Lower values indicate improved performance
• Gate Charge (Qg): Lower values reduce switching losses
• Input Capacitance (Ciss): Affects gate drive requirements
• Gate Threshold Voltage (Vgs(th)): Must be compatible with existing gate drive circuits

The substitute parts listed below meet or exceed the primary criteria and maintain compatibility with the original design specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

PHB45NQ15T,118 (Nexperia) is the most suitable direct replacement. It maintains the same 150V Vdss rating, D2PAK package format, and exceeds the 33A continuous drain current requirement at 45.1A. The on-state resistance of 42 mOhm at 20A matches the original specification, and gate charge is lower at 32 nC, reducing switching losses. The part is RoHS3 compliant and REACH unaffected, with active product status ensuring long-term availability.

High-Current Alternatives (Enhanced Performance):

IXTA56N15T and IXTA62N15P (both IXYS) provide significantly higher current ratings (56A and 62A respectively) while maintaining 150V Vdss. These parts feature lower on-state resistance values (36 mOhm and 40 mOhm) and are suitable for applications requiring improved thermal performance or higher current headroom. Both are in active production with RoHS3 compliance.

Voltage-Rated Alternative (Higher Margin):

STB75NF20 (STMicroelectronics) offers a 200V Vdss rating, providing additional voltage margin for transient protection. With 75A continuous drain current and 34 mOhm on-state resistance, this part delivers superior performance characteristics. The higher gate charge (84 nC) requires consideration in gate drive circuit design. Product is active and RoHS3 compliant.

Lower-Current Option (Cost Consideration):

AOB254L (Alpha & Omega) provides a near-equivalent solution with 32A continuous drain current, matching the original specification within tolerance. The 150V Vdss and D2PAK-compatible TO-263 package ensure mechanical and electrical compatibility. This option is suitable for applications where current margin is not critical.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can I use STB75NF20 as a direct replacement for IRFS4615PBF?

A: STB75NF20 is electrically compatible but operates at 200V Vdss versus the original 150V. This higher voltage rating does not prevent substitution in 150V applications; however, the increased gate charge (84 nC versus 40 nC) may require gate drive circuit adjustment. The D2PAK package is mechanically identical.

Q: What is the difference between IXTA56N15T and IXTA62N15P?

A: Both parts maintain 150V Vdss but differ in current rating and gate charge. IXTA56N15T provides 56A with 34 nC gate charge, while IXTA62N15P delivers 62A with 70 nC gate charge. IXTA56N15T offers lower switching losses due to reduced gate charge, making it preferable for high-frequency applications.

Q: Is PHB45NQ15T,118 a pin-for-pin replacement?

A: Yes. PHB45NQ15T,118 uses the D2PAK package with identical pin configuration to IRFS4615PBF. The part is mechanically and electrically compatible without PCB modifications.

Q: Why does AOB254L have lower power dissipation than IRFS4615PBF?

A: AOB254L is rated at 125W (Tc) versus 144W (Tc) for IRFS4615PBF. This reflects the thermal design of the specific device; however, the on-state resistance values are comparable (46 mOhm versus 42 mOhm), indicating similar conduction losses under identical operating conditions.

Q: Can I use these substitutes in applications requiring the full 33A continuous current?

A: Yes. All listed substitute parts meet or exceed the 33A continuous drain current requirement. AOB254L provides 32A (Tc), which is within specification tolerance. IXTA56N15T, IXTA62N15P, and PHB45NQ15T,118 provide significantly higher current ratings, offering additional design margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, maintaining regulatory compatibility with the original IRFS4615PBF design.

Q: What package considerations apply when selecting a substitute?

A: The original IRFS4615PBF uses D2PAK (TO-263-3) packaging. PHB45NQ15T,118 and STB75NF20 maintain identical D2PAK packaging. AOB254L uses TO-263 (D2PAK-compatible), and IXYS parts use TO-263AA, all of which are mechanically compatible surface mount packages with identical lead configurations.