IRF4905SPBF P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRF4905SPBF is a P-Channel MOSFET manufactured by Infineon Technologies, classified within the HEXFET® series. This device is rated for 55V drain-to-source voltage with a continuous drain current of 42A at 25°C, housed in a D2PAK surface mount package. The IRF4905SPBF is designated as obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

IRF4905SPBF

Infineon TechnologiesIn Stock: 1422IRF4905SPBF Datasheet

Current PartRFQ

AUIRF4905S

Infineon TechnologiesIn Stock: 16899AUIRF4905S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF4905SPBF is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• FET Type: P-Channel topology
• Drain to Source Voltage (Vdss): 55V minimum rating
• Continuous Drain Current (Id): 42A at 25°C
• On-State Resistance (Rds On): 20 mOhm maximum @ 42A, 10V gate drive
• Gate Threshold Voltage (Vgs(th)): 4V maximum @ 250µA
• Gate Charge (Qg): 180 nC maximum @ 10V
• Input Capacitance (Ciss): 3500 pF maximum @ 25V
• Gate Voltage Range (Vgs): ±20V maximum

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Package: D2PAK (TO-263-3) with 2 leads plus tab configuration

Compliance Equivalence Criteria:

• RoHS3 Compliance
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

The AUIRF4905S meets all electrical and mechanical equivalence criteria. Substitution is valid where the application circuit topology, thermal management design, and board layout accommodate the D2PAK package footprint.

Parameter Comparison

Engineering Selection Recommendations

The AUIRF4905S is a direct electrical and mechanical equivalent to the IRF4905SPBF. Both devices are manufactured by Infineon Technologies within the HEXFET® series and share identical electrical specifications across all critical parameters: 55V Vdss rating, 42A continuous drain current, 20 mOhm on-state resistance, and D2PAK surface mount packaging.

Both parts carry obsolete product status, indicating end-of-life designation. Selection between these parts should be based on procurement availability and inventory status. The AUIRF4905S demonstrates higher current inventory availability (16,835 pcs) compared to the IRF4905SPBF (1,357 pcs), making it the preferred choice for new procurement activities.

Both devices maintain identical compliance certifications: RoHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status. The AUIRF4905S exhibits a higher maximum power dissipation rating (200W vs. 170W), which provides additional thermal margin in applications operating near maximum power levels.

Substitution is valid for all circuit applications where the IRF4905SPBF was originally specified, provided that board layout, thermal design, and component placement accommodate the D2PAK package footprint.

Frequently Asked Questions (FAQ)

Q: Can the AUIRF4905S directly replace the IRF4905SPBF in existing designs?

A: Yes. The AUIRF4905S is electrically and mechanically equivalent. All critical electrical parameters—Vdss, Id, Rds On, Vgs(th), Qg, and Ciss—are identical. Both devices use the D2PAK surface mount package with identical pinout and footprint. No circuit modifications are required.

Q: What is the difference in power dissipation between these parts?

A: The IRF4905SPBF is rated for 170W maximum power dissipation, while the AUIRF4905S is rated for 200W. This difference reflects thermal design variations but does not affect electrical performance. The AUIRF4905S provides additional thermal headroom for applications operating at elevated power levels.

Q: Are both parts still available for purchase?

A: Both parts carry obsolete product status. However, the AUIRF4905S has significantly higher inventory availability (16,835 pcs) compared to the IRF4905SPBF (1,357 pcs), making it the more practical choice for procurement.

Q: Do these parts require different PCB layouts or thermal management approaches?

A: No. Both parts use identical D2PAK packaging with the same footprint, lead spacing, and thermal tab configuration. Existing PCB designs and thermal management solutions are directly compatible.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts are RoHS3 compliant, carry MSL Level 1 (unlimited), and are REACH unaffected. Compliance documentation is equivalent.

Q: What gate drive voltage should be used with these devices?

A: Both parts specify a maximum on-state resistance of 20 mOhm at 10V gate drive voltage. Gate voltage range is ±20V maximum. Standard gate drive circuits designed for the IRF4905SPBF are directly applicable to the AUIRF4905S.

Q: Can these parts be used in high-frequency switching applications?

A: Yes. Both parts share identical gate charge (180 nC @ 10V) and input capacitance (3500 pF @ 25V) specifications, making them suitable for identical switching frequency ranges. No performance differences exist in high-frequency operation.