IRF7473PBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRF7473PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 100V drain-to-source voltage with 6.9A continuous drain current at 25°C. This device is part of the HEXFET® series and is designed for surface mount applications in 8-SO packaging. The IRF7473PBF is currently discontinued at DiGi Electronics, making identification of equivalent substitute components essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across critical electrical parameters including voltage rating, current capacity, and thermal characteristics while accommodating the same or compatible package footprints.

Substiute Parts

IRF7473PBF

Infineon TechnologiesIn Stock: 2398IRF7473PBF Datasheet

Current PartRFQ

FDS3572

onsemiIn Stock: 7268FDS3572 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF7473PBF is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• FET Type: Must be N-Channel MOSFET
• Drain to Source Voltage (Vdss): Substitute must equal or exceed 100V
• Continuous Drain Current (Id): Substitute must equal or exceed 6.9A at 25°C
• Package / Case: Must be 8-SOIC (0.154", 3.90mm Width) for PCB compatibility
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must span -55°C to 150°C (TJ)
• RoHS Status: Must be ROHS3 Compliant
• Moisture Sensitivity Level: Must be MSL 1 (Unlimited)

The FDS3572 from onsemi meets these criteria with the following considerations: it provides a lower Vdss rating (80V versus 100V), which restricts its use to applications where the maximum voltage stress does not exceed 80V. However, it offers superior current handling (8.9A versus 6.9A) and lower on-resistance (16mOhm versus 26mOhm), making it suitable for lower-voltage, higher-current applications within the same thermal and package envelope.

Parameter Comparison

Engineering Selection Recommendations

IRF7473PBF (Infineon Technologies):

• Product Status: Discontinued at DiGi Electronics
• Compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification
• Inventory: 2300 Pcs New Original In Stock (at time of data capture)
• Selection Basis: Use only when 100V Vdss rating is mandatory for circuit operation and existing stock is available

FDS3572 (onsemi):

• Product Status: Active
• Compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification
• Inventory: 7176 Pcs New Original In Stock (at time of data capture)
• Selection Basis: Use for new designs or production continuity when maximum drain-to-source voltage does not exceed 80V. Superior current handling and lower on-resistance provide performance advantages in lower-voltage applications. Active product status ensures long-term availability and supply chain stability.

Both parts share identical package footprints (8-SOIC), operating temperature ranges (-55°C to 150°C), power dissipation ratings (2.5W), and compliance certifications, enabling direct PCB layout compatibility when voltage requirements permit substitution.

Frequently Asked Questions (FAQ)

Q: Can FDS3572 directly replace IRF7473PBF in all applications?

A: No. The FDS3572 has a maximum Vdss rating of 80V compared to the IRF7473PBF's 100V. Substitution is valid only in circuits where the maximum drain-to-source voltage does not exceed 80V. Exceeding this voltage rating will cause device failure.

Q: What are the key advantages of FDS3572 over IRF7473PBF?

A: The FDS3572 offers higher continuous drain current (8.9A versus 6.9A), lower on-resistance (16mOhm versus 26mOhm at 10V), lower gate charge (41nC versus 61nC), and lower input capacitance (1990pF versus 3180pF). These characteristics reduce switching losses and improve efficiency in lower-voltage applications.

Q: Are the packages physically compatible?

A: Yes. Both devices use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, enabling identical PCB footprints and no layout modifications.

Q: What is the moisture sensitivity level for both parts?

A: Both IRF7473PBF and FDS3572 have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Are both parts RoHS compliant?

A: Yes. Both devices are ROHS3 Compliant and REACH Unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: Why is IRF7473PBF discontinued?

A: The IRF7473PBF is discontinued at DiGi Electronics. For new designs and production continuity, FDS3572 is recommended as the active substitute when voltage requirements permit.

Q: What is the gate threshold voltage difference between these parts?

A: IRF7473PBF has Vgs(th) of 5.5V @ 250µA, while FDS3572 has 4V @ 250µA. The lower threshold voltage of FDS3572 enables faster switching response at lower gate drive voltages.

Q: Can I use IRF7473PBF in a circuit designed for FDS3572?

A: Yes, provided the circuit design does not require the higher current capacity or lower on-resistance of FDS3572. The IRF7473PBF's higher voltage rating (100V) provides additional safety margin in lower-voltage applications.