IRLR3303 N-Channel 30V 35A MOSFET Equivalent & Substitute Parts

Part Overview

The Infineon IRLR3303 (MFR 94-4007) is an N-Channel MOSFET rated for 30V drain-to-source voltage with 35A continuous drain current in a Surface Mount TO-252AA (DPAK) package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The IRLR3303 operates across a wide temperature range from -55°C to 175°C and features the HEXFET® series technology. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating the same or compatible package footprints.

Substiute Parts

94-4007

Infineon TechnologiesIn Stock: 106794-4007 Datasheet

Current PartRFQ

DMN3024LK3-13

Diodes IncorporatedIn Stock: 35389DMN3024LK3-13 Datasheet

MFR RecommendedRFQ

NTD20N03L27T4G

onsemiIn Stock: 15402NTD20N03L27T4G Datasheet

MFR RecommendedRFQ

STD26P3LLH6

STMicroelectronicsIn Stock: 10461STD26P3LLH6 Datasheet

MFR RecommendedRFQ

STD40NF03LT4

STMicroelectronicsIn Stock: 15229STD40NF03LT4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRLR3303 are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Primary Compatibility Criteria:

• FET Type: N-Channel (excludes P-Channel devices)
• Drain-to-Source Voltage (Vdss): 30V minimum
• Package: TO-252-3 (DPAK) or equivalent Surface Mount footprint
• Mounting Type: Surface Mount

Secondary Electrical Parameters:

• Continuous Drain Current (Id): Minimum 20A at 25°C (allows for current derating in specific applications)
• On-Resistance (Rds On): Comparable performance within ±50% tolerance
• Gate Threshold Voltage (Vgs(th)): Within ±2V of original specification
• Operating Temperature Range: Minimum -55°C to 150°C

Compliance Considerations:

• Active product status preferred for long-term availability
• RoHS3 compliance required for new designs
• Moisture Sensitivity Level (MSL) 1 (Unlimited) maintained

The following substitute parts meet these criteria and are presented in order of electrical and compliance alignment.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: NTD20N03L27T4G (onsemi)

The NTD20N03L27T4G is the recommended primary substitute for the IRLR3303. This device maintains the 30V Vdss specification and provides 20A continuous drain current, sufficient for applications where the full 35A rating is not required. The part is Active status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The on-resistance of 27 mOhm at 10A, 5V is comparable to the original specification. Operating temperature range extends to 150°C, which covers most industrial applications. The DPAK package provides direct mechanical compatibility.

Secondary Substitute: STD40NF03LT4 (STMicroelectronics)

The STD40NF03LT4 serves as a high-current alternative, rated for 40A continuous drain current at 25°C, exceeding the original 35A specification. This device offers superior on-resistance performance at 11 mOhm, reducing power dissipation in high-current applications. The part maintains 30V Vdss and operates across -55°C to 175°C, matching the original temperature range. ROHS3 compliance and Active product status support production continuity. The STripFET™ II series technology provides enhanced performance characteristics.

Tertiary Substitute: DMN3024LK3-13 (Diodes Incorporated)

The DMN3024LK3-13 is suitable for lower-current applications requiring the 30V Vdss specification. Rated for 9.78A continuous drain current, this device is appropriate for designs where current requirements are significantly lower than the original 35A rating. The part features the lowest input capacitance (608 pF) and gate charge (12.9 nC), beneficial for high-frequency switching applications. ROHS3 compliance and Active status ensure regulatory and supply chain continuity. Operating temperature range is -55°C to 150°C.

Compliance and Availability:

All three substitute parts are Active status with ROHS3 compliance, addressing the obsolescence of the original IRLR3303 and meeting modern regulatory requirements. Inventory availability is confirmed for all substitutes, supporting immediate procurement for production requirements.

Frequently Asked Questions (FAQ)

Q: Can the NTD20N03L27T4G directly replace the IRLR3303 in all applications?

A: The NTD20N03L27T4G maintains electrical compatibility for applications requiring up to 20A continuous drain current. Applications designed for the full 35A rating of the IRLR3303 require thermal and current-handling analysis to confirm suitability. The 30V Vdss specification and DPAK package provide direct mechanical and electrical compatibility within the current rating.

Q: What is the difference between the Ta and Tc temperature specifications in the current ratings?

A: Ta (ambient temperature) and Tc (case temperature) represent different measurement conditions. The IRLR3303 specifies 35A at Tc (case temperature), while the NTD20N03L27T4G specifies 20A at Ta (ambient temperature). These represent different thermal reference points and should not be directly compared without thermal analysis of the specific application.

Q: Is the STD40NF03LT4 a direct upgrade for the IRLR3303?

A: The STD40NF03LT4 exceeds the original current specification at 40A and provides superior on-resistance performance. It is mechanically and electrically compatible in the DPAK package. The device is suitable as a direct replacement with improved performance characteristics, particularly in high-current applications.

Q: Why is the DMN3024LK3-13 listed as a substitute if it has lower current rating?

A: The DMN3024LK3-13 is included for applications where the original 35A rating exceeds actual circuit requirements. The device maintains the 30V Vdss specification and DPAK package compatibility. Lower gate charge and input capacitance make it advantageous for high-frequency switching circuits operating at reduced current levels.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (NTD20N03L27T4G, STD40NF03LT4, and DMN3024LK3-13) are ROHS3 compliant. The original IRLR3303 is RoHS non-compliant, making substitution necessary for designs requiring regulatory compliance.

Q: What is the impact of different gate threshold voltages on circuit design?

A: Gate threshold voltage (Vgs(th)) determines the gate voltage required to initiate conduction. The IRLR3303 specifies 1V, while substitutes range from 1V to 3V. Circuits with fixed gate drive voltages must confirm that the substitute's Vgs(th) is compatible with the available drive voltage. Higher Vgs(th) values require proportionally higher gate drive voltages for full conduction.

Q: Can the IRLR3303 be used in new designs, or must substitutes be selected?

A: The IRLR3303 is classified as Obsolete and RoHS non-compliant. New designs should incorporate one of the Active, ROHS3-compliant substitute parts to ensure long-term supply availability and regulatory compliance. Existing production may continue with the original part until inventory depletion.

Q: What package considerations apply when selecting a substitute?

A: All substitute parts use the TO-252-3 (DPAK) package, providing identical PCB footprints and mechanical compatibility. No layout modifications are required for package substitution. Thermal performance may vary due to differences in die size and internal construction; thermal analysis is recommended for high-power applications.