IRF740STRR Equivalent & Substitute Parts

Part Overview

The IRF740STRR is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage with 10A continuous drain current in a surface mount TO-263 (D2PAK) package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the same application category.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	400	V
Current - Continuous Drain (Id) @ 25°C	10	A (Tc)
Rds On (Max) @ Id, Vgs	550	mOhm @ 6A, 10V
Drive Voltage (Max Rds On)	10	V
Vgs(th) (Max) @ Id	4	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	63	nC @ 10V
Vgs (Max)	±20	V
Input Capacitance (Ciss) (Max) @ Vds	1400	pF @ 25V
Power Dissipation (Max)	3.1 (Ta), 125 (Tc)	W
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the IRF740STRR is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Drain-to-Source Voltage (Vdss): 400V minimum
Continuous Drain Current (Id): 10A or greater at 25°C
On-State Resistance (Rds On): 550mOhm or lower at specified gate voltage
Gate Threshold Voltage (Vgs(th)): 4V or lower
Gate Charge (Qg): 63nC or lower
Maximum Gate Voltage (Vgs): ±20V or greater
Input Capacitance (Ciss): 1400pF or lower
Operating Temperature Range: -55°C to 150°C minimum

Mechanical Matching Criteria:

Package Type: TO-263 (D2PAK) surface mount
Pin Configuration: 2 Leads + Tab

Equivalent parts maintain all electrical specifications identically. Substitute parts may vary in secondary parameters (such as gate charge, input capacitance, or power dissipation) while maintaining the primary voltage, current, and resistance specifications within acceptable design margins.

Parameter Comparison

Parameter	IRF740STRR	IRF740STRLPBF	IRF740STRRPBF	STB11NK40ZT4
Manufacturer	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	STMicroelectronics
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Vdss	400V	400V	400V	400V
Id @ 25°C	10A (Tc)	10A (Tc)	10A (Tc)	9A (Tc)
Rds On (Max) @ Id, Vgs	550mOhm @ 6A, 10V	550mOhm @ 6A, 10V	550mOhm @ 6A, 10V	550mOhm @ 4.5A, 10V
Vgs(th) (Max) @ Id	4V @ 250µA	4V @ 250µA	4V @ 250µA	4.5V @ 100µA
Gate Charge (Qg) (Max) @ Vgs	63nC @ 10V	63nC @ 10V	63nC @ 10V	32nC @ 10V
Vgs (Max)	±20V	±20V	±20V	±30V
Ciss (Max) @ Vds	1400pF @ 25V	1400pF @ 25V	1400pF @ 25V	930pF @ 25V
Power Dissipation (Max)	3.1W (Ta), 125W (Tc)	3.1W (Ta), 125W (Tc)	3.1W (Ta), 125W (Tc)	110W (Tc)
Operating Temperature	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Inventory Status	721 Pcs	19971 Pcs	3120 Pcs	2285 Pcs

Engineering Selection Recommendations

IRF740STRLPBF and IRF740STRRPBF (Vishay Siliconix)

These parts are parametric equivalents to the IRF740STRR, maintaining identical electrical specifications across all measured parameters. Both are classified as Active products with ROHS3 compliance, addressing the obsolescence status of the original part. The IRF740STRLPBF offers the highest inventory availability (19,971 pieces) and is packaged in Tape & Reel format suitable for automated assembly. The IRF740STRRPBF provides an alternative Tape & Reel option with 3,120 pieces in stock. Selection between these two should be based on procurement lead time and assembly process requirements.

STB11NK40ZT4 (STMicroelectronics)

This part is a functional substitute manufactured by STMicroelectronics under the SuperMESH™ series. It maintains the critical voltage (400V) and on-state resistance (550mOhm) specifications. The continuous drain current is rated at 9A, which is 1A lower than the IRF740STRR. The STB11NK40ZT4 exhibits superior performance characteristics in secondary parameters: gate charge is reduced to 32nC (50% lower), input capacitance is 930pF (34% lower), and maximum gate voltage is ±30V (50% higher). These improvements result in faster switching performance and reduced gate drive requirements. The part is ROHS3 compliant and Active. Selection of this substitute is appropriate for applications where the 9A rating is sufficient and where reduced switching losses provide design benefits.

All substitute options are ROHS3 compliant and Active products, eliminating obsolescence risk and supporting environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can IRF740STRLPBF or IRF740STRRPBF be used as direct replacements for IRF740STRR?

A: Yes. IRF740STRLPBF and IRF740STRRPBF are parametric equivalents with identical electrical specifications. The primary differences are product status (Active vs. Obsolete), RoHS compliance (ROHS3 vs. Non-Compliant), and packaging format (Tape & Reel vs. Bulk). Both are suitable for direct substitution in existing designs.

Q: What is the difference between IRF740STRLPBF and IRF740STRRPBF?

A: Both parts are electrically identical with matching specifications. The distinction lies in packaging and inventory availability. IRF740STRLPBF has significantly higher stock (19,971 pieces) compared to IRF740STRRPBF (3,120 pieces). Both are supplied in Tape & Reel format. Selection should be based on procurement availability and lead time requirements.

Q: Can STB11NK40ZT4 replace IRF740STRR in all applications?

A: STB11NK40ZT4 is a functional substitute with matching voltage and on-state resistance specifications. However, the continuous drain current rating is 9A versus 10A for the IRF740STRR. Applications requiring the full 10A rating must verify that the 9A limit is acceptable. The STB11NK40ZT4 offers improved switching performance due to lower gate charge (32nC vs. 63nC) and input capacitance (930pF vs. 1400pF), which may provide design benefits in high-frequency switching applications.

Q: Are all substitute parts compatible with the TO-263 (D2PAK) footprint?

A: Yes. All listed substitute parts use the TO-263-3 D2PAK package with 2 leads plus tab configuration, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the IRF740STRR.

Q: What is the significance of the RoHS compliance difference?

A: The IRF740STRR is RoHS non-compliant, while all substitute parts (IRF740STRLPBF, IRF740STRRPBF, and STB11NK40ZT4) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute parts satisfy environmental compliance mandates. The IRF740STRR should not be used in new designs targeting RoHS-regulated markets.

Q: How do gate charge differences affect circuit design?

A: Gate charge (Qg) determines the energy required to switch the MOSFET. The IRF740STRR and its Vishay equivalents require 63nC, while the STB11NK40ZT4 requires only 32nC. Lower gate charge reduces gate drive power dissipation and enables faster switching transitions. Applications with high switching frequencies or limited gate drive capability benefit from the STB11NK40ZT4's lower gate charge specification.

Q: What packaging options are available for procurement?

A: IRF740STRR is supplied in Bulk packaging. IRF740STRLPBF and IRF740STRRPBF are supplied in Tape & Reel (TR) format for automated assembly. STB11NK40ZT4 is supplied in Cut Tape (CT) and Digi-Reel® format. Selection depends on assembly process requirements and volume considerations.

Q: Is the 1A difference in drain current rating between IRF740STRR and STB11NK40ZT4 significant?

A: The significance depends on application requirements. If the design operates continuously at or near 10A, the STB11NK40ZT4's 9A rating may be insufficient. If typical operating current is below 9A with 10A as a peak or transient rating, the STB11NK40ZT4 is suitable. Thermal analysis should confirm that the 9A rating provides adequate margin for the intended application.

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