STP45NF3LL N-Channel MOSFET 30V 45A TO-220 Equivalent & Substitute Parts

Part Overview

The STP45NF3LL is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 30V drain-to-source voltage and 45A continuous drain current in a TO-220 through-hole package. This device is classified as obsolete and has been discontinued from active production. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, maintenance, and new production applications requiring comparable electrical and mechanical characteristics.

Substiute Parts

STP45NF3LL

STMicroelectronicsIn Stock: 1431STP45NF3LL Datasheet

Current PartRFQ

IRFZ44NPBF

Infineon TechnologiesIn Stock: 92478IRFZ44NPBF Datasheet

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PSMN022-30PL,127

Nexperia USA Inc.In Stock: 9036PSMN022-30PL,127 Datasheet

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PSMN2R0-30PL,127

Nexperia USA Inc.In Stock: 10287PSMN2R0-30PL,127 Datasheet

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PSMN4R3-30PL,127

Nexperia USA Inc.In Stock: 5627PSMN4R3-30PL,127 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STP45NF3LL is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must be equal to or greater than 30V
• Continuous Drain Current (Id): Must be equal to or greater than 45A at 25°C
• Package Type: Must be TO-220-3 through-hole configuration
• FET Type: Must be N-Channel MOSFET
• Operating Temperature Range: Must encompass -55°C to 175°C

Secondary Compatibility Factors:

• On-State Resistance (Rds On): Lower values indicate improved performance
• Gate Charge (Qg): Affects switching speed and drive requirements
• Input Capacitance (Ciss): Influences gate drive circuit design
• Power Dissipation Rating: Must support application thermal requirements
• RoHS and REACH Compliance: Ensures regulatory alignment

Substitute parts are grouped into two categories based on current rating capability: parts rated for 45A to 49A continuous drain current, and parts rated for 100A continuous drain current. Both categories maintain the 30V Vdss specification and TO-220 package requirement.

Parameter Comparison

Engineering Selection Recommendations

IRFZ44NPBF (Infineon Technologies)

The IRFZ44NPBF is the only active-status substitute available. It exceeds the STP45NF3LL specifications with 55V Vdss and 49A continuous drain current, providing voltage margin for applications. The device maintains TO-220-3 package compatibility and ROHS3 compliance. Higher power dissipation (94W) and increased gate charge (63 nC) require verification of gate drive circuit capability. This part is suitable for direct replacement in new designs and production applications.

PSMN022-30PL,127 (Nexperia USA Inc.)

This part matches the 30V Vdss specification but provides only 30A continuous drain current, below the 45A requirement of the original device. It is classified as obsolete. This substitute is applicable only in applications where the actual current demand is 30A or less, despite the original design specification of 45A.

PSMN2R0-30PL,127 (Nexperia USA Inc.)

This part maintains 30V Vdss and provides 100A continuous drain current, exceeding the 45A requirement. It features the lowest on-state resistance (2.1 mOhm) among all substitutes, resulting in reduced power dissipation in the application. The device is classified as obsolete. Higher input capacitance (6810 pF) and gate charge (117 nC) require gate drive circuit assessment.

PSMN4R3-30PL,127 (Nexperia USA Inc.)

This part maintains 30V Vdss and provides 100A continuous drain current, exceeding the 45A requirement. It offers moderate on-state resistance (4.3 mOhm) and lower gate charge (41.5 nC) compared to PSMN2R0-30PL,127, reducing gate drive requirements. The device is classified as obsolete. This part provides a balance between current capability and gate drive complexity.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ44NPBF replace the STP45NF3LL in all applications?

A: The IRFZ44NPBF has higher voltage rating (55V vs. 30V) and comparable current rating (49A vs. 45A). It is electrically compatible for applications operating at or below 30V. However, the higher gate charge (63 nC vs. 17 nC) requires verification that the gate drive circuit can supply the additional charge without exceeding timing or power constraints. The TO-220-3 package is identical.

Q: Why would I select PSMN022-30PL,127 if it only provides 30A current?

A: PSMN022-30PL,127 is applicable only when the actual circuit current requirement is 30A or less. If the application was designed for 45A but operates at lower current in practice, this part provides a lower-cost alternative. The 30V Vdss and TO-220-3 package remain compatible.

Q: What is the difference between PSMN2R0-30PL,127 and PSMN4R3-30PL,127?

A: Both parts provide 100A continuous drain current and 30V Vdss. PSMN2R0-30PL,127 has lower on-state resistance (2.1 mOhm vs. 4.3 mOhm), reducing power dissipation but requiring higher gate charge (117 nC vs. 41.5 nC). PSMN4R3-30PL,127 has higher on-state resistance but lower gate charge, simplifying gate drive circuit design. Selection depends on whether power dissipation or gate drive complexity is the limiting factor.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All substitute parts listed are packaged in TO-220-3 through-hole configuration, providing mechanical and thermal interface compatibility with the original STP45NF3LL.

Q: Do all substitute parts meet RoHS and REACH compliance?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the STP45NF3LL.

Q: Which substitute part is recommended for new production designs?

A: The IRFZ44NPBF is the only active-status part and is recommended for new production designs. All other substitutes are classified as obsolete and may face future availability constraints.

Q: Can I use a 100A-rated part in place of a 45A-rated part?

A: Yes, from an electrical standpoint. Parts rated for 100A continuous drain current (PSMN2R0-30PL,127 and PSMN4R3-30PL,127) can operate at 45A without exceeding their ratings. However, the application circuit must accommodate the different on-state resistance and gate charge characteristics. Thermal design must account for the actual power dissipation at the operating current.