IRF740STRL Equivalent & Substitute Parts

Part Overview

The IRF740STRL is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage and 10A continuous drain current in a surface mount TO-263 (D2PAK) package. This device is classified as obsolete, indicating discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to support ongoing production requirements, maintenance operations, and design continuity for applications utilizing this component.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the IRF740STRL are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or functionally equivalent electrical specifications across all critical parameters: Vdss (400V), Id (10A), Rds On (550mOhm @ 6A, 10V), Vgs(th) (4V @ 250µA), Gate Charge (63 nC @ 10V), Input Capacitance (1400 pF @ 25V), and package configuration (TO-263/D2PAK). These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Alternatives provide equivalent or superior electrical performance within the same application class but may exhibit variations in specific parameters such as Vdss rating, continuous drain current, gate charge, or input capacitance. These parts are suitable for applications where the specified parameter variations do not compromise circuit operation.

The following key parameters determine substitution eligibility:

Drain-to-Source Voltage (Vdss): Minimum 400V
Continuous Drain Current (Id): Minimum 10A
On-State Resistance (Rds On): Maximum 550mOhm @ specified conditions
Package Type: TO-263/D2PAK surface mount configuration
Operating Temperature Range: -55°C to 150°C minimum

Parameter Comparison

Parameter	IRF740STRL	IRF740STRLPBF	IRF740STRRPBF	IXTA12N50P	STB11NK40ZT4
Manufacturer	Vishay Siliconix	Vishay Siliconix	Vishay Siliconix	IXYS	STMicroelectronics
Vdss (V)	400	400	400	500	400
Id @ 25°C (A)	10	10	10	12	9
Rds On @ 6A, 10V (mOhm)	550	550	550	500	550
Vgs(th) @ 250µA (V)	4	4	4	5.5	4.5
Gate Charge @ 10V (nC)	63	63	63	29	32
Ciss @ 25V (pF)	1400	1400	1400	1830	930
Power Dissipation Max (W)	3.1 (Ta), 125 (Tc)	3.1 (Ta), 125 (Tc)	3.1 (Ta), 125 (Tc)	200 (Tc)	110 (Tc)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-263 (D2PAK)	TO-263 (D2PAK)	TO-263 (D2PAK)	TO-263AA	D2PAK
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

IRF740STRLPBF and IRF740STRRPBF are parametric equivalents of the IRF740STRL, offering identical electrical specifications and package configuration. Both parts are manufactured by Vishay Siliconix and maintain active product status. The primary distinction between these equivalents is packaging format: IRF740STRLPBF is supplied in Tape & Reel (TR) format with 19,971 units in stock, while IRF740STRRPBF is also supplied in Tape & Reel format with 3,120 units in stock. Both parts are ROHS3 compliant, addressing regulatory requirements that the original IRF740STRL does not meet. These parts are suitable for direct substitution in all applications where the IRF740STRL was originally specified.

Manufacturer Recommended Alternatives:

IXTA12N50P (IXYS) provides enhanced electrical performance with a 500V Vdss rating (100V higher than the original), 12A continuous drain current (2A higher), and reduced gate charge (29 nC versus 63 nC), resulting in faster switching characteristics. The on-state resistance is improved to 500 mOhm. This part is suitable for applications requiring higher voltage margin or improved switching performance. The higher input capacitance (1830 pF) and elevated gate threshold voltage (5.5V) must be evaluated against circuit drive requirements.

STB11NK40ZT4 (STMicroelectronics) maintains the 400V Vdss rating and equivalent on-state resistance (550 mOhm) but operates at 9A continuous drain current (1A lower than the original). This part features significantly reduced gate charge (32 nC) and input capacitance (930 pF), enabling faster switching operation. The STB11NK40ZT4 is suitable for applications where the 9A current rating is sufficient and where reduced switching losses are beneficial. All three substitute parts maintain the -55°C to 150°C operating temperature range and are ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can IRF740STRLPBF and IRF740STRRPBF be used interchangeably with the IRF740STRL?

A: Yes. IRF740STRLPBF and IRF740STRRPBF are parametric equivalents with identical electrical specifications and package configuration. The difference between these two parts is the packaging format (both are Tape & Reel), not the electrical performance. Both are direct functional replacements for the obsolete IRF740STRL.

Q: What is the primary advantage of using IRF740STRLPBF or IRF740STRRPBF over the original IRF740STRL?

A: Both IRF740STRLPBF and IRF740STRRPBF are ROHS3 compliant, whereas the original IRF740STRL is RoHS non-compliant. Additionally, both substitute parts maintain active product status, ensuring long-term availability and supply chain continuity. Electrical performance remains identical.

Q: Is the IXTA12N50P suitable as a direct replacement for the IRF740STRL?

A: IXTA12N50P is a manufacturer recommended alternative, not a direct parametric equivalent. While it maintains the same package type (TO-263/D2PAK), it differs in several electrical parameters: 500V Vdss (versus 400V), 12A Id (versus 10A), 29 nC gate charge (versus 63 nC), and 1830 pF input capacitance (versus 1400 pF). Circuit evaluation is required to confirm compatibility, particularly regarding gate drive voltage and switching speed requirements.

Q: What are the key differences between the STB11NK40ZT4 and the IRF740STRL?

A: The STB11NK40ZT4 maintains the 400V Vdss and 550 mOhm on-state resistance specifications but operates at 9A continuous drain current (1A lower). It features significantly lower gate charge (32 nC versus 63 nC) and input capacitance (930 pF versus 1400 pF), enabling faster switching operation. The STB11NK40ZT4 is suitable for applications where the 9A current rating is adequate and where reduced switching losses are advantageous.

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

A: Yes. All substitute parts listed utilize the TO-263/D2PAK surface mount package configuration, maintaining mechanical and electrical pin compatibility with the original IRF740STRL. No PCB redesign is required for footprint accommodation.

Q: What is the inventory status of each substitute part?

A: IRF740STRLPBF has 19,971 units in stock, IRF740STRRPBF has 3,120 units in stock, IXTA12N50P has 844 units in stock, and STB11NK40ZT4 has 2,285 units in stock. All parts are available as new original components.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. IRF740STRLPBF, IRF740STRRPBF, IXTA12N50P, and STB11NK40ZT4 are all ROHS3 compliant. The original IRF740STRL is RoHS non-compliant, making the substitute parts suitable for applications with RoHS regulatory requirements.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts, including the original IRF740STRL, operate across the -55°C to 150°C (TJ) temperature range, maintaining thermal performance consistency across the product family.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message