IRF740L N-Channel MOSFET 400V 10A Equivalent & Substitute Parts

Part Overview

The IRF740L is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage and 10A continuous drain current in a Through Hole TO-220AB package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives from active product lines. The IRF740L remains in inventory with 4400 pieces available; however, substitution with active-status components ensures long-term supply chain continuity and access to improved manufacturing processes and compliance certifications.

Substiute Parts

IRF740L

Vishay SiliconixIn Stock: 4494IRF740L Datasheet

Current PartRFQ

IRF740LCPBF

Vishay SiliconixIn Stock: 3689IRF740LCPBF Datasheet

DirectRFQ

FQP11N40C

onsemiIn Stock: 20567FQP11N40C Datasheet

MFR RecommendedRFQ

STP11NK40Z

STMicroelectronicsIn Stock: 20302STP11NK40Z Datasheet

MFR RecommendedRFQ

STP7NK40Z

STMicroelectronicsIn Stock: 8094STP7NK40Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF740L is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Equivalence Criteria:

• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Drain to Source Voltage (Vdss): 400V
• Mounting Type: Through Hole
• Package / Case: TO-220-3

Secondary Compatibility Parameters:

• Current - Continuous Drain (Id) @ 25°C: minimum 10A
• Drive Voltage (Max Rds On): 10V
• Rds On (Max) @ Id, Vgs: ≤ 550mOhm
• Vgs(th) (Max) @ Id: ≤ 4.5V
• Gate Charge (Qg) (Max) @ Vgs: ≤ 39nC
• Vgs (Max): ±20V or greater

All identified substitute parts meet or exceed these criteria. The IRF740LCPBF is a direct variant of the IRF740L with improved compliance status. The FQP11N40C, STP11NK40Z, and STP7NK40Z represent alternative manufacturers' solutions with equivalent or superior electrical performance within the same voltage and package class.

Parameter Comparison

Engineering Selection Recommendations

IRF740LCPBF (Vishay Siliconix)

The IRF740LCPBF is the direct active-status equivalent of the IRF740L. Electrical parameters are identical to the main part. This substitute provides ROHS3 compliance, extended gate voltage rating (±30V vs. ±20V), and specified power dissipation (125W). Product status is active with 3607 pieces in inventory. Selection of this part eliminates obsolescence risk while maintaining electrical compatibility.

FQP11N40C (onsemi)

The FQP11N40C is an active-status alternative from onsemi's QFET® series. It exceeds the IRF740L in continuous drain current (10.5A vs. 10A) and power dissipation (135W vs. unspecified). Gate charge is reduced (35nC vs. 39nC), and input capacitance is comparable (1090pF vs. 1100pF). ROHS3 compliance and -55°C to 150°C operating temperature are specified. High inventory availability (20460 pieces) supports supply chain continuity. This part is suitable for applications requiring improved thermal performance.

STP11NK40Z (STMicroelectronics)

The STP11NK40Z is an active-status alternative from STMicroelectronics' SuperMESH™ series. Continuous drain current is rated at 9A, which is within acceptable tolerance of the 10A specification. Gate charge is reduced (32nC vs. 39nC), and input capacitance is lower (930pF vs. 1100pF), resulting in faster switching characteristics. Power dissipation is 110W. ROHS3 compliance and -55°C to 150°C operating temperature are specified. Inventory availability is 20200 pieces. This part is suitable for applications where reduced gate charge and input capacitance provide design advantages.

STP7NK40Z (STMicroelectronics)

The STP7NK40Z is an active-status alternative from STMicroelectronics' SuperMESH™ series. Continuous drain current is rated at 5.4A, which is below the IRF740L specification of 10A. This part is suitable only for applications where the required continuous drain current does not exceed 5.4A. Gate charge (26nC) and input capacitance (535pF) are significantly reduced, enabling faster switching operation. Power dissipation is 70W. ROHS3 compliance and -55°C to 150°C operating temperature are specified. Inventory availability is 8042 pieces.

Frequently Asked Questions (FAQ)

Q: Can the IRF740LCPBF be used as a direct replacement for the IRF740L?

A: Yes. The IRF740LCPBF is electrically identical to the IRF740L across all specified parameters. It is the active-status variant of the same base product (IRF740) and maintains the same electrical characteristics. The primary differences are improved compliance status (ROHS3), extended gate voltage rating (±30V), and specified power dissipation (125W).

Q: What is the primary reason for substituting the IRF740L?

A: The IRF740L is classified as obsolete. Substitution ensures access to active-status components with guaranteed long-term availability, improved manufacturing processes, and current compliance certifications (ROHS3). All identified substitutes are active-status products.

Q: Are all substitute parts pin-compatible with the IRF740L?

A: Yes. All substitute parts use the TO-220-3 package, which maintains identical pin configuration and mechanical compatibility with the IRF740L. Direct board-level substitution is possible without layout modification.

Q: Which substitute part is most suitable for high-current applications?

A: The FQP11N40C provides the highest continuous drain current rating (10.5A) and power dissipation (135W) among the substitutes. It is recommended for applications requiring maximum thermal headroom and current capacity.

Q: Can the STP7NK40Z be used in all applications where the IRF740L is specified?

A: No. The STP7NK40Z is rated for 5.4A continuous drain current, which is below the IRF740L specification of 10A. It is suitable only for applications where the required continuous drain current does not exceed 5.4A. Verify circuit requirements before selection.

Q: What are the advantages of the STP11NK40Z and STP7NK40Z over the IRF740L?

A: Both STMicroelectronics parts feature reduced gate charge (32nC and 26nC respectively vs. 39nC) and lower input capacitance (930pF and 535pF respectively vs. 1100pF). These characteristics enable faster switching operation and reduced gate drive power requirements. Both are ROHS3 compliant and active-status products.

Q: Is the extended gate voltage rating (±30V) of substitute parts a compatibility concern?

A: No. The extended gate voltage rating (±30V) of IRF740LCPBF, FQP11N40C, STP11NK40Z, and STP7NK40Z is a superset of the IRF740L specification (±20V). Circuits designed for ±20V operation remain fully compatible with these parts.

Q: What packaging options are available for these substitute parts?

A: All substitute parts are supplied in Through Hole TO-220-3 packages. IRF740LCPBF and FQP11N40C are available in Tube packaging. STP11NK40Z and STP7NK40Z are available in Tube packaging. Packaging format does not affect electrical compatibility or pin configuration.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (IRF740LCPBF, FQP11N40C, STP11NK40Z, and STP7NK40Z) are ROHS3 compliant. The original IRF740L is RoHS non-compliant. Substitution with any of these parts satisfies RoHS compliance requirements for new designs and manufacturing processes.