AUIRFU540Z Equivalent & Substitute Parts

Part Overview

The AUIRFU540Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 100V drain-to-source voltage with 35A continuous drain current. This device is packaged in the IPAK (TO-251-3 Short Leads) form factor and is designed for through-hole mounting applications. The AUIRFU540Z carries an Obsolete product status, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

AUIRFU540Z

Infineon TechnologiesIn Stock: 11907AUIRFU540Z Datasheet

Current PartRFQ

STP30NF10

STMicroelectronicsIn Stock: 70978STP30NF10 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AUIRFU540Z is based on electrical parameter equivalence within the N-Channel MOSFET category. The critical parameters determining substitutability are:

Electrical Equivalence Criteria:

• Drain to Source Voltage (Vdss): 100V minimum rating
• Continuous Drain Current (Id): 35A minimum at 25°C
• Gate Threshold Voltage (Vgs(th)): 4V maximum
• Maximum Gate Voltage (Vgs): ±20V
• Operating Temperature Range: -55°C to 175°C minimum

Mechanical Compatibility Considerations:

• Mounting Type: Through Hole
• Package Category: IPAK or TO-220 form factors (both suitable for through-hole applications)

The STP30NF10 meets all electrical equivalence criteria and operates within the same temperature range. While the package differs (TO-220 versus IPAK), both are through-hole mounted devices with compatible pin configurations for N-Channel MOSFET applications.

Parameter Comparison

Engineering Selection Recommendations

The STP30NF10 is a direct electrical equivalent to the AUIRFU540Z for N-Channel MOSFET applications requiring 100V/35A performance. Both devices meet ROHS3 compliance and operate across the full -55°C to 175°C temperature range.

Key Considerations:

The AUIRFU540Z is classified as Obsolete, whereas the STP30NF10 maintains Active product status with significantly higher inventory availability (70,887 pieces versus 11,800 pieces). This status difference ensures long-term supply continuity and manufacturing support for the STP30NF10.

Both devices are certified under the same regulatory frameworks (ROHS3 Compliant, REACH Unaffected, ECCN EAR99, HTSUS 8541.29.0095), confirming equivalent compliance posture for procurement and export purposes.

The primary design consideration is package form factor: the AUIRFU540Z uses IPAK (TO-251-3 Short Leads) while the STP30NF10 uses TO-220-3. Both are through-hole mounted packages; however, PCB layout and thermal management design must account for the different physical dimensions and lead configurations. The STP30NF10 offers higher maximum power dissipation (115W versus 91W), providing additional thermal margin in applications approaching power limits.

Frequently Asked Questions (FAQ)

Q: Can the STP30NF10 directly replace the AUIRFU540Z without circuit modification?

A: Electrical substitution is valid based on matching Vdss (100V), Id (35A), Vgs(th) (4V), and Vgs (±20V) ratings. However, package form factor differs: IPAK versus TO-220. PCB layout modifications are required to accommodate the different physical dimensions and lead spacing of the TO-220 package.

Q: What is the significance of the Rds On difference between these devices?

A: The AUIRFU540Z specifies 28.5 mOhm @ 21A, 10V while the STP30NF10 specifies 45 mOhm @ 15A, 10V. The AUIRFU540Z exhibits lower on-resistance at the specified test current. For applications sensitive to conduction losses, this parameter difference must be evaluated against thermal design margins and power budget requirements.

Q: Are there thermal management differences between IPAK and TO-220 packages?

A: Both packages are through-hole mounted; however, thermal characteristics differ due to physical design. The TO-220 package typically provides different thermal resistance pathways. The STP30NF10 supports higher maximum power dissipation (115W versus 91W), indicating enhanced thermal capability in the TO-220 form factor.

Q: Why is the STP30NF10 listed as Active while the AUIRFU540Z is Obsolete?

A: Product status reflects manufacturer support and availability. The Obsolete designation for AUIRFU540Z indicates discontinued production by Infineon. The Active status of STP30NF10 ensures ongoing manufacturing, quality support, and supply availability from STMicroelectronics.

Q: Are both devices suitable for the same operating temperature range?

A: Yes. Both the AUIRFU540Z and STP30NF10 operate across -55°C to 175°C (TJ), providing equivalent thermal operating range for circuit design purposes.

Q: What compliance certifications apply to both devices?

A: Both devices are ROHS3 Compliant, REACH Unaffected, classified under ECCN EAR99, and assigned HTSUS code 8541.29.0095. Compliance posture is equivalent for procurement and regulatory purposes.

Q: How do gate charge specifications compare?

A: The AUIRFU540Z specifies 59 nC @ 10V while the STP30NF10 specifies 55 nC @ 10V. The difference is minimal and does not affect gate drive circuit design for standard switching applications.

Q: What is the input capacitance difference and does it matter?

A: The AUIRFU540Z specifies 1690 pF @ 25V while the STP30NF10 specifies 1180 pF @ 25V. The lower input capacitance of the STP30NF10 may provide faster switching response in high-frequency applications, though both values are within typical operating ranges for 100V/35A MOSFETs.