AUIRLL024Z N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRLL024Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage with 5A continuous drain current in a surface mount SOT-223 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The AUIRLL024Z belongs to the HEXFET® series and is designed for applications requiring low on-resistance switching performance in compact surface mount form factors. Due to its obsolete status, active alternative components with compatible electrical and mechanical specifications are required for new designs and production continuity.

Substiute Parts

AUIRLL024Z

Infineon TechnologiesIn Stock: 1159AUIRLL024Z Datasheet

Current PartRFQ

NVF3055L108T1G

onsemiIn Stock: 3111NVF3055L108T1G Datasheet

MFR RecommendedRFQ

STN4NF06L

STMicroelectronicsIn Stock: 3335STN4NF06L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AUIRLL024Z is determined by compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology required
• Drain-to-Source Voltage (Vdss): Minimum 55V rating; higher ratings (60V) are acceptable as they provide voltage margin
• Continuous Drain Current (Id): Minimum 5A at 25°C; substitute parts rated at 3A or 4A represent reduced current capability and require application-level verification
• On-Resistance (Rds On): Lower values indicate improved performance; higher values increase power dissipation
• Gate Threshold Voltage (Vgs(th)): Must be compatible with drive circuitry; values between 2V and 3V are within acceptable range
• Maximum Gate Voltage (Vgs Max): ±15V or ±16V are compatible with ±16V specification
• Operating Temperature Range: Minimum -55°C to 150°C; extended ranges provide additional margin

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Package / Case: SOT-223 (TO-261-4, TO-261AA) pinout compatibility mandatory
• Moisture Sensitivity Level: MSL 1 (Unlimited) acceptable

Substitute parts identified:

• STN4NF06L (STMicroelectronics): 60V, 4A, active status, SOT-223 package
• NVF3055L108T1G (onsemi): 60V, 3A, active status, SOT-223 package, automotive qualified

Parameter Comparison

Engineering Selection Recommendations

STN4NF06L (STMicroelectronics)

The STN4NF06L is an active product with 60V Vdss rating and 4A continuous drain current, providing closest current capability match to the AUIRLL024Z. This device features lower gate charge (9 nC) and reduced input capacitance (340 pF) compared to the main part, resulting in faster switching characteristics. The STripFET™ II series technology delivers improved on-resistance performance at higher current levels. Operating temperature range matches the AUIRLL024Z at -55°C to 150°C. RoHS3 compliance and unlimited MSL rating ensure compatibility with modern manufacturing standards. This substitute is suitable for applications where the 4A current rating is sufficient.

NVF3055L108T1G (onsemi)

The NVF3055L108T1G is an active product with 60V Vdss rating and 3A continuous drain current. This device includes automotive qualification (AEC-Q101) and extended operating temperature range to 175°C, providing additional thermal margin. The higher input capacitance (440 pF) and gate charge (15 nC) require consideration in high-frequency switching applications. RoHS3 compliance and unlimited MSL rating are provided. This substitute is suitable for applications where the 3A current rating is acceptable and automotive-grade reliability is required.

Product Status Consideration

Both substitute parts maintain active product status with established supply chains, ensuring long-term availability and design continuity. The AUIRLL024Z obsolete status necessitates transition to one of these active alternatives for new designs and ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can the STN4NF06L directly replace the AUIRLL024Z in all applications?

A: The STN4NF06L is mechanically and electrically compatible in SOT-223 package applications. The 4A continuous drain current rating is lower than the AUIRLL024Z 5A rating. Applications operating at or below 4A continuous drain current can use this substitute without modification. Applications requiring the full 5A capability require evaluation of the NVF3055L108T1G or alternative parts with higher current ratings.

Q: What is the impact of different on-resistance values between these parts?

A: The AUIRLL024Z specifies 60 mOhm at 3A and 10V gate voltage. The STN4NF06L specifies 100 mOhm at 1.5A and 10V gate voltage, while the NVF3055L108T1G specifies 120 mOhm at 1.5A and 5V gate voltage. Higher on-resistance increases power dissipation during conduction. Applications with tight thermal budgets or high switching frequency require detailed power dissipation analysis using actual operating current and duty cycle.

Q: Are the SOT-223 packages pinout-compatible?

A: Yes. All three parts use SOT-223 (TO-261-4, TO-261AA) package with identical pinout. Direct PCB footprint compatibility is confirmed. No layout modifications are required for package substitution.

Q: What is the significance of the different gate threshold voltages?

A: The AUIRLL024Z specifies Vgs(th) maximum of 3V at 250µA, while STN4NF06L specifies 2.8V and NVF3055L108T1G specifies 2V. Lower threshold voltages enable operation with lower gate drive voltages. Applications using fixed gate drive voltage must verify that the selected substitute achieves full on-state conduction at the available drive voltage. All three parts are compatible with ±15V or ±16V gate drive supplies.

Q: Does the NVF3055L108T1G automotive qualification affect non-automotive applications?

A: Automotive qualification (AEC-Q101) indicates enhanced reliability testing and quality assurance. Non-automotive applications benefit from this higher qualification level without penalty. The automotive-grade part is suitable for all application categories.

Q: How do gate charge differences affect circuit design?

A: The AUIRLL024Z specifies 11 nC gate charge at 5V, STN4NF06L specifies 9 nC, and NVF3055L108T1G specifies 15 nC. Lower gate charge reduces gate drive power requirements and enables faster switching transitions. Applications with current-limited gate drive circuits or high-frequency switching must account for these differences in gate driver selection and timing analysis.

Q: What is the impact of input capacitance variation on switching performance?

A: Input capacitance values range from 340 pF (STN4NF06L) to 440 pF (NVF3055L108T1G) compared to 380 pF (AUIRLL024Z). Higher input capacitance increases gate charge requirements and switching transition time. High-frequency switching applications (above 1 MHz) require detailed analysis of gate driver capability and switching loss impact.

Q: Are all three parts suitable for battery-powered applications?

A: Yes. All three parts feature MSL 1 (Unlimited) moisture sensitivity rating and RoHS3 compliance. The lower power dissipation of the AUIRLL024Z (1W) and NVF3055L108T1G (1.3W) compared to STN4NF06L (3.3W) may provide thermal advantages in power-constrained battery applications. Actual selection depends on required current rating and thermal design.