IRF740ASTRLPBF Equivalent & Substitute Parts

Part Overview

The IRF740ASTRLPBF is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage with 10A continuous drain current at 25°C. This device is housed in a Surface Mount TO-263 (D2PAK) package and is designed for high-voltage switching applications requiring moderate current handling and power dissipation up to 125W. The part is currently Active in product status and RoHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity).

Equivalent and substitute parts are identified based on matching or exceeding critical electrical parameters including drain-to-source voltage rating, continuous drain current capability, on-state resistance characteristics, gate charge, and thermal performance, while maintaining compatibility with the same Surface Mount package family and operating temperature range.

Substiute Parts

IRF740ASTRLPBF

Vishay SiliconixIn Stock: 2204IRF740ASTRLPBF Datasheet

Current PartRFQ

IXFA12N50P

IXYSIn Stock: 1158IXFA12N50P Datasheet

MFR RecommendedRFQ

IXTA12N50P

IXYSIn Stock: 898IXTA12N50P Datasheet

MFR RecommendedRFQ

STB11NK40ZT4

STMicroelectronicsIn Stock: 2395STB11NK40ZT4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF740ASTRLPBF is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must have a Drain to Source Voltage (Vdss) rating equal to or greater than 400V to ensure safe operation in the same circuit topology.

Current Capability: Substitute parts must support a continuous drain current (Id) at 25°C equal to or greater than 10A to handle the same load conditions.

On-State Resistance (Rds On): Substitute parts must maintain comparable or lower on-state resistance at the specified gate-source voltage (Vgs) to ensure similar conduction losses and thermal performance.

Package Compatibility: All substitute parts must use Surface Mount TO-263 package variants (D2PAK, TO-263AA, TO-263AB) to maintain mechanical and thermal interface compatibility.

Operating Temperature Range: Substitute parts must support the full operating temperature range of -55°C to 150°C (TJ).

Compliance and Status: All substitute parts must be Active in product status and RoHS3 compliant to meet regulatory and supply chain requirements.

Parameter Comparison

Engineering Selection Recommendations

IXFA12N50P and IXTA12N50P (IXYS): These parts exceed the voltage and current specifications of the IRF740ASTRLPBF, with 500V Vdss rating and 12A continuous drain current. Both devices feature lower on-state resistance (500 mOhm vs. 550 mOhm) and higher power dissipation capability (200W vs. 125W). Gate charge is reduced (29 nC vs. 36 nC), resulting in faster switching characteristics. Both are Active products with RoHS3 compliance and MSL Level 1 rating. The IXFA12N50P is available in HiPerFET™ and Polar series, while IXTA12N50P is Polar series. Both are suitable for applications requiring enhanced performance margins and improved thermal management.

STB11NK40ZT4 (STMicroelectronics): This part maintains the same 400V Vdss rating as the IRF740ASTRLPBF but with slightly reduced continuous drain current (9A vs. 10A). On-state resistance is equivalent (550 mOhm), and gate charge is comparable (32 nC vs. 36 nC). Power dissipation is lower (110W vs. 125W). The STB11NK40ZT4 is part of the SuperMESH™ series and is Active with RoHS3 compliance. This part is suitable for direct replacement in applications where the 400V voltage class is required and current demand does not exceed 9A.

All substitute parts maintain Surface Mount TO-263 package compatibility, identical operating temperature range (-55°C to 150°C), and equivalent gate-source voltage ratings (±30V). Selection between substitutes depends on specific application requirements for voltage headroom, current capacity, thermal dissipation, and switching speed.

Frequently Asked Questions (FAQ)

Q: Can IXFA12N50P or IXTA12N50P be used as direct replacements for IRF740ASTRLPBF?

A: Yes. Both IXYS parts meet or exceed all critical electrical parameters. The higher voltage rating (500V vs. 400V) provides additional design margin. The increased current capability (12A vs. 10A) and lower on-state resistance (500 mOhm vs. 550 mOhm) result in improved performance. Surface Mount TO-263 package compatibility ensures mechanical and thermal interface compatibility. Both are Active products with RoHS3 compliance.

Q: What are the differences between IXFA12N50P and IXTA12N50P?

A: Both parts share identical electrical specifications: 500V Vdss, 12A continuous drain current, 500 mOhm on-state resistance, 29 nC gate charge, and 200W power dissipation. The primary difference is series designation: IXFA12N50P is HiPerFET™ and Polar series, while IXTA12N50P is Polar series. Both are packaged in TO-263AA and are suitable for equivalent applications.

Q: Is STB11NK40ZT4 suitable for all applications using IRF740ASTRLPBF?

A: STB11NK40ZT4 is suitable for applications where continuous drain current does not exceed 9A. The part maintains the same 400V voltage rating and equivalent on-state resistance (550 mOhm). Power dissipation capability is lower (110W vs. 125W). Applications requiring the full 10A current capacity or higher thermal dissipation should use IXFA12N50P or IXTA12N50P instead.

Q: Are all substitute parts available in the same package?

A: All substitute parts use Surface Mount TO-263 package variants. IRF740ASTRLPBF uses TO-263-3 D2PAK (2 Leads + Tab). IXFA12N50P and IXTA12N50P use TO-263AA (IXFA) or TO-263AA respectively. STB11NK40ZT4 uses D2PAK. All variants are mechanically and thermally compatible within the TO-263 family.

Q: What is the impact of lower gate charge in substitute parts?

A: Lower gate charge (29 nC for IXYS parts vs. 36 nC for IRF740ASTRLPBF) results in faster switching transitions and reduced gate drive power requirements. This improves overall circuit efficiency and allows for higher switching frequencies without additional gate drive circuit modifications.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All substitute parts are RoHS3 compliant, Active in product status, and rated for MSL Level 1 (Unlimited moisture sensitivity). All carry ECCN EAR99 and HTSUS 8541.29.0095 classifications matching the main part.

Q: What is the significance of higher power dissipation ratings in IXYS parts?

A: The IXFA12N50P and IXTA12N50P feature 200W power dissipation capability compared to 125W for IRF740ASTRLPBF. This provides additional thermal margin in applications with sustained high current or high switching frequency operation, reducing junction temperature rise and extending device reliability.

Q: Can these parts be used interchangeably in PCB layouts?

A: Yes. All parts use Surface Mount TO-263 package variants with identical pin configurations and thermal tab placement. PCB layouts designed for IRF740ASTRLPBF accommodate all substitute parts without modification.