IRLL3303TR N-Channel MOSFET 30V 4.6A SOT-223 Equivalent & Substitute Parts

Part Overview

The IRLL3303TR is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the SOT-223 package. This device features a 30V drain-to-source voltage rating with a continuous drain current of 4.6A at 25°C and a maximum power dissipation of 1W. The IRLL3303TR is classified as an obsolete product, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. Active substitute parts maintain electrical and mechanical compatibility while offering improved performance characteristics or enhanced availability.

Substiute Parts

IRLL3303TR

Infineon TechnologiesIn Stock: 3356IRLL3303TR Datasheet

Current PartRFQ

STN4NF03L

STMicroelectronicsIn Stock: 77850STN4NF03L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRLL3303TR is determined by strict electrical and mechanical compatibility criteria. The primary substitute, STN4NF03L, qualifies as an equivalent based on the following parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss): Both devices rated at 30V, ensuring identical voltage class operation
• Gate Threshold Voltage (Vgs(th)): Both devices specify 1V @ 250µA, maintaining consistent gate drive requirements
• Maximum Gate Voltage (Vgs): Both devices rated at ±16V, ensuring compatible gate signal levels
• Operating Temperature Range: Both devices operate across -55°C to 150°C (TJ), providing identical thermal operating envelope

Mechanical Compatibility Criteria:

• Package Type: Both devices utilize SOT-223 surface mount package
• Package Designation: Both devices specified as TO-261-4 and TO-261AA
• Mounting Type: Both devices are surface mount, enabling direct PCB substitution

Performance Enhancement Parameters: The STN4NF03L provides improved electrical performance relative to the IRLL3303TR while maintaining full compatibility:

• Continuous Drain Current: 6.5A versus 4.6A (42% increase in current capacity)
• Power Dissipation: 3.3W versus 1W (230% increase in thermal capability)
• Rds On: 50mOhm @ 2A, 10V (lower on-resistance reduces conduction losses)
• Gate Charge: 9nC versus 50nC (82% reduction in switching losses)
• Input Capacitance: 330pF versus 840pF (61% reduction in input capacitance)

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The IRLL3303TR is classified as obsolete, indicating discontinued manufacturing and limited long-term availability. The STN4NF03L maintains active product status with confirmed inventory of 77,761 pieces, ensuring sustained procurement capability and supply chain reliability.

Regulatory Compliance: The IRLL3303TR is RoHS non-compliant, whereas the STN4NF03L is ROHS3 compliant. Both devices are REACH unaffected and classified under ECCN EAR99 and HTSUS 8541.29.0095. For applications subject to RoHS directives or customer compliance requirements, the STN4NF03L satisfies regulatory mandates.

Electrical Compatibility: The STN4NF03L operates within identical voltage and temperature specifications as the IRLL3303TR. Gate drive requirements remain unchanged, permitting direct circuit substitution without modification to gate signal conditioning or biasing networks.

Performance Enhancement: The STN4NF03L delivers superior electrical performance through reduced gate charge (9nC versus 50nC), lower input capacitance (330pF versus 840pF), and increased power dissipation capability (3.3W versus 1W). These characteristics reduce switching losses and improve thermal margin in power conversion applications.

Mechanical Compatibility: Both devices utilize identical SOT-223 surface mount packaging with TO-261-4 and TO-261AA designations, enabling direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the STN4NF03L directly replace the IRLL3303TR in existing designs?

A: Yes. The STN4NF03L maintains electrical compatibility across all critical parameters: 30V Vdss rating, 1V gate threshold voltage, ±16V maximum gate voltage, and -55°C to 150°C operating temperature range. Mechanical compatibility is ensured through identical SOT-223 packaging. Direct substitution requires no circuit modification.

Q: What are the key differences between these devices?

A: The STN4NF03L provides enhanced performance characteristics: 42% higher continuous drain current (6.5A versus 4.6A), 230% greater power dissipation capability (3.3W versus 1W), 82% lower gate charge (9nC versus 50nC), and 61% reduced input capacitance (330pF versus 840pF). The STN4NF03L is also active product status with ROHS3 compliance, whereas the IRLL3303TR is obsolete and RoHS non-compliant.

Q: Are there any thermal considerations when substituting these parts?

A: The STN4NF03L's increased power dissipation rating (3.3W versus 1W) provides greater thermal margin. Both devices operate across identical temperature ranges (-55°C to 150°C TJ). The STN4NF03L's lower gate charge and input capacitance reduce switching losses, potentially lowering junction temperature in dynamic applications.

Q: Does the package footprint remain identical?

A: Yes. Both devices are specified in SOT-223 surface mount package with TO-261-4 and TO-261AA designations. PCB footprints are identical, permitting direct component substitution without layout modification.

Q: What is the impact of lower gate charge on circuit performance?

A: The STN4NF03L's gate charge of 9nC versus the IRLL3303TR's 50nC reduces the charge required for gate switching transitions. This decreases switching losses in gate driver circuits and reduces power consumption in applications with high switching frequencies.

Q: Are moisture sensitivity levels equivalent?

A: Yes. Both devices specify Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating identical moisture handling and storage requirements.

Q: What inventory status should be considered for procurement?

A: The IRLL3303TR has 3,294 pieces in stock but is classified as obsolete with no ongoing manufacturing. The STN4NF03L has 77,761 pieces in stock with active product status, ensuring sustained availability for current and future procurement requirements.