PSMN7R0-40LS,115 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The PSMN7R0-40LS,115 is an N-Channel MOSFET manufactured by NXP USA Inc., rated for 40V drain-to-source voltage with 40A continuous drain current at 25°C. The device is housed in an 8-DFN3333 (3.3x3.3) surface mount package and dissipates up to 65W at the case temperature. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Substiute Parts

PSMN7R0-40LS,115

NXP USA Inc.In Stock: 795PSMN7R0-40LS,115 Datasheet

Current PartRFQ

DMN4008LFG-13

Diodes IncorporatedIn Stock: 23573DMN4008LFG-13 Datasheet

MFR RecommendedRFQ

DMN4008LFG-7

Diodes IncorporatedIn Stock: 23508DMN4008LFG-7 Datasheet

MFR RecommendedRFQ

RQ3G150GNTB

Rohm SemiconductorIn Stock: 6686RQ3G150GNTB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PSMN7R0-40LS,115 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain-to-source voltage (Vdss) must equal or exceed 40V
• On-state resistance (Rds On) must be compatible with the application's current-handling requirements
• Gate threshold voltage (Vgs(th)) and gate charge (Qg) affect switching characteristics
• Input capacitance (Ciss) influences gate drive requirements
• Maximum gate voltage (Vgs) must accommodate ±20V

Mechanical Compatibility Criteria:

• Surface mount package type (8-VDFN or equivalent compact form factor)
• Operating temperature range must span -55°C to 150°C
• Exposed pad configuration for thermal management

Compliance Requirements:

• RoHS3 compliance
• Moisture sensitivity level (MSL) of 1 or better
• REACH unaffected status

The three substitute parts listed below meet these criteria while offering active product status and improved availability compared to the obsolete PSMN7R0-40LS,115.

Parameter Comparison

Engineering Selection Recommendations

RQ3G150GNTB (Rohm Semiconductor) - Primary Substitute

The RQ3G150GNTB is the closest electrical equivalent to the PSMN7R0-40LS,115. It maintains a 40V Vdss rating with 39A continuous drain current, matching the original part's current-handling capability. The on-state resistance of 7.2 mOhm at 15A, 10V is comparable to the original 7 mOhm specification. The RQ3G150GNTB features lower gate charge (11.6 nC) and lower input capacitance (1450 pF) compared to the original, resulting in improved switching efficiency. Power dissipation is rated at 20W (Tc), which is lower than the original 65W but adequate for most applications. The part is active, RoHS3 compliant, and maintains MSL 1 rating. The 8-HSMT package (3.2x3) is mechanically compatible with the original 8-DFN3333 footprint for surface mount applications.

DMN4008LFG-13 and DMN4008LFG-7 (Diodes Incorporated) - Secondary Substitutes

Both DMN4008LFG variants are electrically compatible with the PSMN7R0-40LS,115 for applications requiring lower continuous drain current. These parts are rated for 14.4A continuous drain current at 25°C (Ta), which is significantly lower than the original 40A specification. The on-state resistance of 7.5 mOhm is nearly identical to the original. These parts feature higher gate charge (74 nC) and substantially higher input capacitance (3537 pF), which may increase gate drive power requirements. Power dissipation is rated at 1W (Ta), indicating reduced thermal output. Both variants are active products with full RoHS3 compliance and MSL 1 rating. The 8-PowerVDFN package is mechanically compatible with the original footprint. These substitutes are suitable for applications where the original 40A current rating exceeds system requirements.

Selection Basis:

All three substitute parts satisfy the mandatory compliance requirements: RoHS3 compliance, MSL 1 rating, and REACH unaffected status. All maintain the -55°C to 150°C operating temperature range. All are active products with established supply chains, addressing the obsolescence of the original PSMN7R0-40LS,115. Package compatibility is confirmed for all substitutes in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can the DMN4008LFG-13 or DMN4008LFG-7 replace the PSMN7R0-40LS,115 in all applications?

A: No. The DMN4008LFG variants are rated for 14.4A continuous drain current, compared to the original part's 40A rating. These substitutes are suitable only for applications where the required continuous drain current does not exceed 14.4A. For applications requiring the full 40A capability, the RQ3G150GNTB is the appropriate substitute.

Q: What is the impact of higher gate charge in the DMN4008LFG variants?

A: The DMN4008LFG-13 and DMN4008LFG-7 have gate charge of 74 nC compared to the original 21.4 nC. Higher gate charge requires greater charge delivery from the gate driver circuit, increasing switching losses and potentially requiring a more robust gate drive design. The RQ3G150GNTB has lower gate charge (11.6 nC), reducing gate drive requirements.

Q: Are the package dimensions compatible between the original and substitute parts?

A: The original PSMN7R0-40LS,115 uses an 8-DFN3333 (3.3x3.3) package. The RQ3G150GNTB uses an 8-HSMT (3.2x3) package, and the DMN4008LFG variants use an 8-PowerVDFN package. While these packages differ slightly in dimensions, all are compact 8-pin surface mount packages with exposed pads suitable for the same PCB footprint class. Verification of specific PCB layout compatibility is required for each application.

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

A: Tc (case temperature) and Ta (ambient temperature) represent different measurement points. The original PSMN7R0-40LS,115 specifies continuous drain current at Tc (case temperature), while the DMN4008LFG variants specify at Ta (ambient temperature). The RQ3G150GNTB specifies at Tc. Tc-based ratings typically allow higher current specifications because the case temperature is lower than junction temperature under the same power dissipation conditions.

Q: Is the RQ3G150GNTB suitable for high-power applications requiring 65W dissipation?

A: The RQ3G150GNTB is rated for 20W power dissipation at case temperature, compared to the original 65W rating. For applications requiring sustained power dissipation above 20W, thermal management analysis is required to determine if the RQ3G150GNTB can operate within acceptable junction temperature limits. The lower power dissipation rating may necessitate improved PCB thermal design or active cooling.

Q: Are all substitute parts available in the same packaging options?

A: The original PSMN7R0-40LS,115 is available in Tape & Reel packaging. The RQ3G150GNTB is available in Cut Tape (CT) and Digi-Reel packaging. The DMN4008LFG-13 and DMN4008LFG-7 are available in Tape & Reel (TR) packaging. Packaging format availability should be confirmed with the supplier for production requirements.

Q: Do all substitute parts meet the same compliance standards as the original?

A: Yes. All three substitute parts are RoHS3 compliant, have MSL 1 rating (unlimited moisture sensitivity), and are REACH unaffected. All are classified under the same HTSUS code (8541.29.0095) and ECCN (EAR99) as the original part.