STD46P4LLF6 Equivalent & Substitute Parts

Part Overview

The STD46P4LLF6 is a P-Channel MOSFET manufactured by STMicroelectronics, rated for 40V drain-to-source voltage with 46A continuous drain current at 25°C. This device is part of the STripFET™ F6 series and is housed in a Surface Mount DPAK package. The part is Active in product status and fully compliant with RoHS3 and REACH regulations.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining the same package form factor and mounting technology. Substitution becomes necessary when the primary part experiences supply constraints, extended lead times, or inventory limitations.

Substiute Parts

STD46P4LLF6

STMicroelectronicsIn Stock: 15378STD46P4LLF6 Datasheet

Current PartRFQ

AOD4185

Alpha & Omega Semiconductor Inc.In Stock: 50181AOD4185 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STD46P4LLF6 are identified based on strict electrical and mechanical compatibility criteria. The following parameters define the substitution scope:

Critical Matching Parameters:

• FET Type: P-Channel topology
• Drain to Source Voltage (Vdss): 40V minimum rating
• Package Form Factor: TO-252-3 DPAK (2 Leads + Tab), SC-63
• Mounting Technology: Surface Mount
• Rds On (Max): 15 mOhm or lower @ specified Id and Vgs conditions
• Vgs(th) (Max): Within ±20V gate voltage specification
• Operating Temperature Range: Support for 175°C junction temperature minimum

Acceptable Variation Parameters:

• Continuous Drain Current (Id): Substitute parts rated at 40A or higher satisfy applications requiring up to 46A operation
• Gate Charge (Qg): Variations within the specified Vgs range are acceptable
• Input Capacitance (Ciss): Variations acceptable within the specified Vds range
• Power Dissipation: Substitute parts rated at 62.5W (Tc) or higher are acceptable

The AOD4185 meets all critical matching parameters and acceptable variation criteria, qualifying it as a direct substitute for the STD46P4LLF6.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: STD46P4LLF6

The STD46P4LLF6 is the preferred selection when available. This part is Active in product status, fully compliant with RoHS3 and REACH regulations, and carries MSL 1 (Unlimited) moisture sensitivity classification. The device delivers 46A continuous drain current with 70W power dissipation capability at case temperature, providing optimal performance headroom for high-current switching applications.

Substitute Part: AOD4185

The AOD4185 is a qualified substitute when the STD46P4LLF6 is unavailable. This part is also Active in product status and maintains full RoHS3 and REACH compliance with MSL 1 (Unlimited) classification. The AOD4185 delivers 40A continuous drain current with 62.5W power dissipation at case temperature. The substitute part is electrically compatible within the specified parameter tolerances and shares identical package geometry (TO-252-3 DPAK).

Selection Criteria:

• Use STD46P4LLF6 for applications requiring maximum current capacity (46A) or maximum power dissipation (70W).
• Use AOD4185 when supply availability of the primary part is constrained and application current requirements do not exceed 40A continuous drain current.
• Both parts are suitable for applications operating at junction temperatures up to 175°C.
• Both parts maintain identical gate voltage specifications (±20V maximum) and surface mount DPAK packaging.

Frequently Asked Questions (FAQ)

Q: Can the AOD4185 be used as a direct replacement for the STD46P4LLF6 in all applications?

A: The AOD4185 is a direct substitute for applications where continuous drain current does not exceed 40A. The STD46P4LLF6 is rated for 46A continuous drain current, while the AOD4185 is rated for 40A. Applications requiring the full 46A rating must use the STD46P4LLF6. Both parts share identical package geometry and electrical specifications within their respective current ratings.

Q: Are there package compatibility concerns when substituting the AOD4185 for the STD46P4LLF6?

A: No. Both parts use the identical TO-252-3 DPAK (2 Leads + Tab) package designation SC-63. Pin configuration, lead spacing, and thermal tab dimensions are identical. No PCB layout modifications are required for substitution.

Q: What is the difference in gate charge between these parts?

A: The STD46P4LLF6 has a maximum gate charge of 34 nC at 4.5V, while the AOD4185 has a maximum gate charge of 55 nC at 10V. Gate charge is measured at different gate voltage levels for each part. The AOD4185's higher gate charge value reflects measurement at a higher gate voltage (10V versus 4.5V). Both parts operate within the ±20V maximum gate voltage specification.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the STD46P4LLF6 and AOD4185 are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity classification. Both parts are classified under ECCN EAR99 and HTSUS 8541.29.0095.

Q: What is the maximum junction temperature for both parts?

A: Both parts are rated for a maximum junction temperature (TJ) of 175°C. The STD46P4LLF6 achieves 70W power dissipation at case temperature, while the AOD4185 achieves 62.5W power dissipation at case temperature. Thermal management design should account for these power dissipation ratings.

Q: Are there differences in on-resistance (Rds On) between these parts?

A: Both parts specify a maximum Rds On of 15 mOhm at 10V gate voltage. The STD46P4LLF6 specifies this value at 23A drain current, while the AOD4185 specifies this value at 20A drain current. The identical Rds On specification ensures equivalent switching losses and thermal performance within their respective current ratings.

Q: What is the input capacitance difference, and does it affect circuit design?

A: The STD46P4LLF6 has a maximum input capacitance of 3525 pF at 25V, while the AOD4185 has a maximum input capacitance of 2550 pF at 20V. Input capacitance affects gate drive circuit design and switching speed. The AOD4185's lower input capacitance may result in slightly faster switching transitions. Circuit simulation or testing is appropriate when switching frequency is a critical design parameter.