STW46NF30 Equivalent & Substitute Parts

Part Overview

The STW46NF30 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 300V drain-to-source voltage with 42A continuous drain current at 25°C. This device is part of the STripFET™ II series and is housed in a TO-247-3 through-hole package. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or when performance parameters align within acceptable operational ranges for the target application.

Substiute Parts

STW46NF30

STMicroelectronicsIn Stock: 625727STW46NF30 Datasheet

Current PartRFQ

IXFH50N30Q3

IXYSIn Stock: 3302IXFH50N30Q3 Datasheet

SimilarRFQ

IXTQ36N30P

IXYSIn Stock: 2368IXTQ36N30P Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STW46NF30 is determined by the following critical parameters:

Primary Substitution Criteria:

• Drain to Source Voltage (Vdss): 300V (exact match required)
• FET Type: N-Channel (exact match required)
• Technology: MOSFET (Metal Oxide) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Drive Voltage: 10V (exact match required)

Secondary Compatibility Parameters:

• Continuous Drain Current (Id): Equal to or greater than 42A
• Gate Charge (Qg): Lower or comparable values preferred for switching efficiency
• Rds On (Max): Lower or comparable values preferred for thermal performance
• Operating Temperature Range: Must support application requirements
• RoHS3 Compliance: Required for regulatory alignment

The identified substitute parts meet the primary substitution criteria and maintain compatibility within the secondary parameters, allowing for direct functional replacement in applications designed for the STW46NF30.

Parameter Comparison

Engineering Selection Recommendations

IXFH50N30Q3 Substitution:

The IXFH50N30Q3 meets all primary substitution criteria with a higher continuous drain current rating (50A versus 42A). This part offers enhanced thermal performance with 690W maximum power dissipation compared to 300W for the STW46NF30. The gate charge is lower (65 nC versus 90 nC), resulting in improved switching efficiency. The IXFH50N30Q3 is RoHS3 compliant and maintains Active product status. Package compatibility requires verification as the IXFH50N30Q3 uses TO-247AD (IXFH) versus the TO-247-3 standard package. Operating temperature range is -55°C to 150°C, which is lower than the STW46NF30 maximum of 175°C.

IXTQ36N30P Substitution:

The IXTQ36N30P meets all primary substitution criteria with a lower continuous drain current rating (36A versus 42A). This part is suitable for applications where the 36A rating is sufficient. The gate charge is comparable (70 nC versus 90 nC), providing improved switching efficiency. The IXTQ36N30P is RoHS3 compliant and maintains Active product status. Package compatibility requires verification as the IXTQ36N30P uses TO-3P versus the TO-247-3 standard package. Operating temperature range is -55°C to 150°C, which is lower than the STW46NF30 maximum of 175°C. Maximum gate voltage is ±30V, providing greater gate drive margin than the STW46NF30 at ±20V.

Frequently Asked Questions (FAQ)

Q: Can the IXFH50N30Q3 directly replace the STW46NF30 in my circuit?

A: The IXFH50N30Q3 meets all electrical substitution criteria (300V Vdss, N-Channel MOSFET, 10V drive voltage, 50A continuous drain current). However, the package type differs (TO-247AD versus TO-247-3). Physical board layout and PCB footprint compatibility must be verified before implementation.

Q: What is the primary difference between the IXFH50N30Q3 and IXTQ36N30P?

A: The IXFH50N30Q3 provides higher continuous drain current (50A versus 36A) and superior power dissipation capability (690W versus 300W). The IXTQ36N30P uses a different package type (TO-3P) and has a higher maximum gate voltage rating (±30V versus ±20V). Selection depends on application current requirements and available board space.

Q: Are all three parts RoHS3 compliant?

A: Yes. The STW46NF30, IXFH50N30Q3, and IXTQ36N30P are all RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What is the impact of different gate charge values on my application?

A: Gate charge (Qg) affects switching speed and driver power requirements. The IXFH50N30Q3 (65 nC) and IXTQ36N30P (70 nC) have lower gate charge than the STW46NF30 (90 nC), resulting in faster switching transitions and reduced gate driver power consumption. This may improve overall circuit efficiency.

Q: Why is the operating temperature range different for the substitute parts?

A: The STW46NF30 supports junction temperatures up to 175°C, while both IXYS substitutes are rated to 150°C maximum. Applications requiring operation above 150°C cannot use the IXFH50N30Q3 or IXTQ36N30P as direct replacements.

Q: Can I use the IXTQ36N30P if my application requires 42A continuous current?

A: No. The IXTQ36N30P is rated for 36A continuous drain current, which is below the 42A requirement. Using this part in an application designed for 42A would exceed the device rating and create reliability risks.

Q: What certifications apply to all three parts?

A: All three parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.29.0095. All maintain Active product status.