IXFH40N30Q Equivalent & Substitute Parts

Part Overview

The IXFH40N30Q is an N-Channel MOSFET rated for 300V drain-to-source voltage with 40A continuous drain current at 25°C. This device is packaged in a TO-247AD through-hole configuration and is part of the IXYS HiPerFET™ series. The part is currently listed as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement.

Substiute Parts

IXFH40N30Q

IXYSIn Stock: 1310IXFH40N30Q Datasheet

Current PartRFQ

IXFH40N30

IXYSIn Stock: 1131IXFH40N30 Datasheet

SimilarRFQ

STW46NF30

STMicroelectronicsIn Stock: 625727STW46NF30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFH40N30Q is determined by the following critical electrical and mechanical parameters:

Voltage Rating: All substitute parts must maintain the 300V Vdss specification to ensure safe operation in the same circuit topology.

Current Rating: Substitute parts must support a minimum continuous drain current of 40A at 25°C. Parts with equal or higher current ratings are acceptable.

Power Dissipation: The 300W maximum power dissipation rating must be maintained or exceeded.

On-State Resistance (Rds On): The maximum on-state resistance at specified gate voltage and current conditions determines switching losses and thermal performance. Substitute parts with equal or lower Rds On values are acceptable.

Gate Charge (Qg): Gate charge affects switching speed and driver requirements. Substitute parts with equal or lower gate charge are acceptable.

Package Type: The TO-247-3 through-hole package is the mechanical requirement. Substitute parts must use identical or compatible package configurations.

Operating Temperature: The -55°C to 150°C operating range must be supported by substitute parts.

Parameter Comparison

Engineering Selection Recommendations

IXFH40N30 (IXYS): This part is an active product from the same manufacturer and series as the obsolete IXFH40N30Q. It maintains identical voltage and current ratings, package type, and operating temperature range. The IXFH40N30 exhibits slightly higher gate charge (200 nC versus 140 nC) and input capacitance (4800 pF versus 3100 pF), which may result in marginally increased switching losses. On-state resistance is comparable (85 mOhm versus 80 mOhm). This part is ROHS3 compliant and REACH unaffected, meeting regulatory requirements. The IXFH40N30 is the direct active equivalent from IXYS.

STW46NF30 (STMicroelectronics): This part is an active product from STMicroelectronics in the STripFET™ II series. It exceeds the voltage and current specifications of the IXFH40N30Q, with a 42A continuous drain current rating versus 40A. The STW46NF30 demonstrates superior on-state resistance performance (75 mOhm at 17A versus 80 mOhm at 500mA) and lower gate charge (90 nC versus 140 nC), resulting in reduced switching losses. The operating temperature range extends to 175°C, providing additional thermal margin. This part is ROHS3 compliant and REACH unaffected. The STW46NF30 is a cross-manufacturer substitute with improved electrical characteristics.

Both substitute parts are actively manufactured and meet all regulatory compliance requirements. Selection between them depends on design priorities regarding switching speed, thermal performance, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the IXFH40N30 directly replace the obsolete IXFH40N30Q?

A: Yes. The IXFH40N30 is an active product from IXYS with identical voltage rating (300V), current rating (40A), power dissipation (300W), and package type (TO-247-3). Both parts operate across the same temperature range (-55°C to 150°C). The IXFH40N30 is the direct active equivalent.

Q: What are the differences between the IXFH40N30 and STW46NF30?

A: Both parts meet the 300V voltage requirement and support the 40A current specification. The STW46NF30 offers a higher current rating (42A), lower on-state resistance (75 mOhm versus 85 mOhm), and lower gate charge (90 nC versus 200 nC). The STW46NF30 also provides an extended operating temperature range to 175°C. These differences result in lower switching losses and improved thermal performance with the STW46NF30.

Q: Are all three parts packaged identically?

A: Yes. The IXFH40N30Q, IXFH40N30, and STW46NF30 all use the TO-247-3 through-hole package configuration. Pin compatibility and mounting requirements are identical.

Q: Do these parts meet RoHS and REACH compliance?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: How does gate charge affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off. The IXFH40N30Q requires 140 nC, the IXFH40N30 requires 200 nC, and the STW46NF30 requires 90 nC. Lower gate charge reduces driver power dissipation and enables faster switching transitions. The STW46NF30 provides the lowest gate charge among the three options.

Q: Which substitute part should be selected for new designs?

A: For new designs, the IXFH40N30 or STW46NF30 are both acceptable. The IXFH40N30 maintains continuity with the original IXYS product line. The STW46NF30 offers superior electrical performance with lower switching losses and extended temperature range. Selection depends on design requirements, supply chain considerations, and performance priorities.