IRFPF40 N-Channel MOSFET 900V 4.7A Equivalent & Substitute Parts

Part Overview

The IRFPF40 is an N-Channel MOSFET rated for 900V drain-to-source voltage with 4.7A continuous drain current at 25°C. This device is packaged in a TO-247-3 through-hole configuration and is rated for 150W power dissipation. The IRFPF40 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with comparable performance characteristics within the same application class.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	900	V
Continuous Drain Current (Id) @ 25°C	4.7	A (Tc)
On-State Resistance (Rds On) @ 2.8A, 10V	2.5	Ohm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	120	nC
Power Dissipation (Max)	150	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	TO-247-3	Through Hole

Substitute Part Grouping Explanation

Substitution of the IRFPF40 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 900V
Continuous Drain Current (Id) must equal or exceed 4.7A at 25°C
On-State Resistance (Rds On) must not exceed 2.5Ohm at rated conditions
Gate Threshold Voltage (Vgs(th)) must be compatible with 10V drive voltage
Power Dissipation capability must support 150W or greater

Mechanical Compatibility Criteria:

Package must be TO-247-3 or equivalent through-hole configuration
Mounting type must be through-hole
Pin configuration must be compatible with TO-247-3 footprint

Compliance Criteria:

RoHS compliance status
REACH compliance status
Moisture Sensitivity Level (MSL) rating

Substitute parts are grouped into two categories: parametric equivalents (identical specifications) and manufacturer-recommended alternatives (enhanced or comparable performance within the same voltage and current class).

Parameter Comparison

Parameter	IRFPF40	IRFPF40PBF	STW7NK90Z	IXFH4N100Q
Manufacturer	Vishay Siliconix	Vishay Siliconix	STMicroelectronics	IXYS
Product Status	Obsolete	Active	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	900	900	900	1000
Id @ 25°C (A)	4.7	4.7	5.8	4.0
Rds On @ 10V (Ohm)	2.5	2.5	2.0	3.0
Vgs(th) (V)	4	4	4.5	5
Gate Charge Qg @ 10V (nC)	120	120	60.5	39
Power Dissipation (W)	150	150	140	150
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-247-3	TO-247-3	TO-247-3	TO-247-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tube	Tube	Bulk

Engineering Selection Recommendations

IRFPF40PBF (Parametric Equivalent)

The IRFPF40PBF is the direct parametric equivalent of the IRFPF40. It maintains identical electrical specifications across all critical parameters: 900V Vdss, 4.7A continuous drain current, 2.5Ohm Rds On, and 150W power dissipation. The primary distinction is product status: IRFPF40PBF is active and ROHS3 compliant, whereas the original IRFPF40 is obsolete and non-compliant. This part is supplied in tube packaging. Selection of IRFPF40PBF is appropriate for direct replacement in existing designs without circuit modification.

STW7NK90Z (Manufacturer-Recommended Substitute)

The STW7NK90Z from STMicroelectronics maintains the same 900V voltage rating and TO-247-3 package as the IRFPF40. It provides enhanced performance with 5.8A continuous drain current (23% higher than IRFPF40), improved on-state resistance of 2.0Ohm (20% lower), and reduced gate charge of 60.5nC (50% lower). Power dissipation is rated at 140W, which is 7% lower than the IRFPF40. The STW7NK90Z is active and ROHS3 compliant. This part is suitable for applications requiring improved efficiency and faster switching characteristics within the same voltage class.

IXFH4N100Q (Manufacturer-Recommended Substitute)

The IXFH4N100Q from IXYS provides a higher voltage rating of 1000V compared to the IRFPF40's 900V. Continuous drain current is rated at 4.0A, which is 15% lower than the IRFPF40. On-state resistance is 3.0Ohm, representing a 20% increase. Gate charge is significantly reduced at 39nC. Power dissipation capability matches the IRFPF40 at 150W. The IXFH4N100Q is active and ROHS3 compliant. This part is applicable in designs requiring higher voltage margin or where the reduced current rating is acceptable.

Frequently Asked Questions (FAQ)

Q: Can IRFPF40PBF be used as a direct replacement for IRFPF40?

A: Yes. The IRFPF40PBF is a parametric equivalent with identical electrical and mechanical specifications. It is pin-compatible and requires no circuit modifications. The primary advantage is that IRFPF40PBF is active and ROHS3 compliant, addressing the obsolescence of the original IRFPF40.

Q: What is the difference between IRFPF40 and STW7NK90Z?

A: Both devices share the same 900V voltage rating and TO-247-3 package. The STW7NK90Z offers superior performance: 5.8A versus 4.7A drain current, 2.0Ohm versus 2.5Ohm on-state resistance, and 60.5nC versus 120nC gate charge. Power dissipation is slightly lower at 140W. The STW7NK90Z is suitable for applications prioritizing efficiency and switching speed.

Q: Is IXFH4N100Q compatible with IRFPF40 circuits?

A: The IXFH4N100Q is mechanically compatible (TO-247-3 package) and electrically compatible for applications where the 900V rating is not a limiting factor. However, the reduced drain current (4.0A versus 4.7A) and increased on-state resistance (3.0Ohm versus 2.5Ohm) must be evaluated against circuit requirements. The higher voltage rating (1000V) provides additional margin in high-voltage applications.

Q: What packaging formats are available for these parts?

A: IRFPF40PBF is supplied in tube packaging. STW7NK90Z is supplied in tube packaging. IXFH4N100Q is supplied in bulk packaging. Packaging format selection depends on procurement volume and handling requirements.

Q: Are all substitute parts RoHS compliant?

A: IRFPF40PBF, STW7NK90Z, and IXFH4N100Q are all ROHS3 compliant. The original IRFPF40 is RoHS non-compliant. For applications requiring RoHS compliance, any of the three substitute parts are acceptable.

Q: Which substitute part should be selected for a new design?

A: For new designs, IRFPF40PBF is recommended if the original IRFPF40 specifications are required. STW7NK90Z is recommended if improved efficiency and reduced switching losses are design priorities. IXFH4N100Q is recommended if higher voltage margin is required or if the reduced current rating is acceptable.

Q: What is the moisture sensitivity level for these parts?

A: All parts listed—IRFPF40, IRFPF40PBF, STW7NK90Z, and IXFH4N100Q—are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message