STB46NF30 Equivalent & Substitute Parts

Part Overview

The STB46NF30 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 300V drain-to-source voltage and 42A continuous drain current at 25°C. Housed in a TO-263 (D2PAK) surface mount package, this device delivers 300W maximum power dissipation and operates across a temperature range of -55°C to 175°C. The part is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific application parameters that fall within the electrical and mechanical compatibility envelope of the original specification.

Substiute Parts

STB46NF30

STMicroelectronicsIn Stock: 2252STB46NF30 Datasheet

Current PartRFQ

IXTA36N30P

IXYSIn Stock: 3152IXTA36N30P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STB46NF30 are identified based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: Drain-to-source voltage (Vdss) must equal or exceed 300V to maintain dielectric integrity in the application circuit.

Current Handling Capability: Continuous drain current (Id) at 25°C must support the application's maximum current demand. The STB46NF30 specifies 42A; substitute parts with lower current ratings require circuit-level current derating analysis.

Package Compatibility: The TO-263 (D2PAK) surface mount package establishes mechanical and thermal interface requirements. Substitute parts must utilize identical or functionally equivalent package geometries.

Power Dissipation: Maximum power dissipation rating of 300W (Tc) establishes thermal management boundaries. Substitute parts with equal or higher ratings maintain thermal design margins.

Operating Temperature Range: The STB46NF30 operates from -55°C to 175°C. Substitute parts must cover this range or a subset thereof without compromising application performance.

On-State Resistance (Rds On): The 75 mOhm specification at 17A, 10V establishes conduction losses. Substitute parts with higher Rds On values increase power dissipation and require thermal re-evaluation.

Parameter Comparison

Engineering Selection Recommendations

STB46NF30 (Primary Selection)

The STB46NF30 remains the primary component selection when design specifications require 42A continuous drain current capability. This device delivers superior on-state resistance performance at 75 mOhm, resulting in lower conduction losses and reduced thermal stress. The extended operating temperature range of -55°C to 175°C accommodates high-temperature applications. Moisture sensitivity level 1 (unlimited) eliminates moisture-related handling constraints. Active product status ensures long-term availability and supply chain stability.

IXTA36N30P (Substitute Selection)

The IXTA36N30P from IXYS serves as a substitute when application current requirements do not exceed 36A continuous drain current. This device maintains identical 300V voltage rating and 300W power dissipation capability. The lower gate charge (70 nC versus 90 nC) and reduced input capacitance (2250 pF versus 3200 pF) provide faster switching characteristics, beneficial in high-frequency switching applications. However, the higher on-state resistance of 110 mOhm increases conduction losses by approximately 47% compared to the STB46NF30. The operating temperature range limitation to 150°C (versus 175°C) restricts use in extreme high-temperature environments. Moisture sensitivity level 3 requires controlled storage and handling within 168-hour windows. Both devices maintain ROHS3 compliance and Active product status.

Frequently Asked Questions (FAQ)

Q: Can the IXTA36N30P directly replace the STB46NF30 in all applications?

A: Direct substitution is limited by current rating. The IXTA36N30P is rated for 36A continuous drain current versus the STB46NF30's 42A. Applications operating above 36A require the STB46NF30. Applications operating at or below 36A may use the IXTA36N30P with thermal re-evaluation due to higher on-state resistance (110 mOhm versus 75 mOhm).

Q: What are the thermal implications of substituting the IXTA36N30P?

A: The IXTA36N30P exhibits 47% higher on-state resistance at comparable current levels. This increases power dissipation and junction temperature rise. Thermal design calculations must account for the higher Rds On value. Applications operating near thermal limits of the original design may exceed safe junction temperatures with the substitute part.

Q: Are the TO-263 packages mechanically interchangeable?

A: Both devices use TO-263 surface mount packages (D2PAK geometry). The STB46NF30 specifies TO-263-3 and TO-263AB variants, while the IXTA36N30P specifies TO-263AA. These package designations represent minor manufacturing variations within the TO-263 family. Mechanical footprints are compatible for PCB layout purposes. Thermal interface characteristics remain equivalent.

Q: What is the impact of different gate charge specifications?

A: The STB46NF30 specifies 90 nC gate charge versus 70 nC for the IXTA36N30P. Lower gate charge reduces driver circuit power consumption and enables faster switching transitions. Applications utilizing high-frequency PWM or resonant switching benefit from the IXTA36N30P's lower gate charge. Low-frequency applications experience negligible impact.

Q: How do moisture sensitivity levels affect component handling?

A: The STB46NF30 carries MSL 1 (unlimited), permitting indefinite storage without moisture absorption concerns. The IXTA36N30P carries MSL 3 (168 hours), requiring controlled storage environments and reflow processing within 168 hours of package opening. Applications with extended component inventory or variable production schedules favor the STB46NF30's superior moisture tolerance.

Q: Are both devices suitable for high-temperature applications above 150°C?

A: The STB46NF30 operates to 175°C junction temperature, supporting high-temperature applications. The IXTA36N30P is limited to 150°C, restricting use in extreme thermal environments. Applications requiring operation above 150°C mandate the STB46NF30.

Q: What compliance certifications apply to both devices?

A: Both the STB46NF30 and IXTA36N30P maintain ROHS3 compliance and REACH unaffected status. Both devices carry EAR99 export classification and identical HTSUS commodity codes (8541.29.0095). Regulatory and compliance requirements do not differentiate between these parts.