IRF9540 P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRF9540 is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) rated for 100V drain-to-source voltage with 19A continuous drain current at 25°C. The device is packaged in a Through Hole TO-220AB configuration and is rated for 150W maximum power dissipation. The IRF9540 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production and field replacement applications.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	100	V
Current - Continuous Drain (Id) @ 25°C	19	A (Tc)
Rds On (Max) @ Id, Vgs	200	mOhm @ 11A, 10V
Power Dissipation (Max)	150	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the IRF9540 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 100V
FET Type: Must be P-Channel
Technology: Must be MOSFET (Metal Oxide)
Operating Temperature Range: Must support -55°C to 175°C minimum
Vgs (Max): Must support ±20V gate voltage operation

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: TO-220-3 or TO-220AB equivalent

Performance Considerations:

Current - Continuous Drain (Id): Substitute parts with Id ≥ 14A satisfy minimum current requirements
Rds On (Max): Substitute parts with Rds On ≤ 200mOhm @ specified conditions maintain on-state performance
Power Dissipation (Max): Substitute parts with power rating ≥ 79W support thermal requirements

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications and active product status) and Functional Alternatives (compatible electrical parameters with potential performance trade-offs).

Parameter Comparison

Parameter	IRF9540	IRF9540PBF	IRF9540NPBF	IRF9530NPBF	FQP17P10	SPP15P10PLHXKSA1
Manufacturer	Vishay Siliconix	Vishay Siliconix	Infineon Technologies	Infineon Technologies	onsemi	Infineon Technologies
Product Status	Obsolete	Active	Active	Active	Active	Active
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss (V)	100	100	100	100	100	100
Id @ 25°C (A)	19	19	23	14	16.5	15
Rds On (Max) (mOhm)	200 @ 11A, 10V	200 @ 11A, 10V	117 @ 11A, 10V	200 @ 8.4A, 10V	190 @ 8.25A, 10V	200 @ 11.3A, 10V
Vgs(th) (Max) @ Id (V)	4 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA	2 @ 1.54mA
Vgs (Max) (V)	±20	±20	±20	±20	±30	±20
Gate Charge (Qg) (nC)	61 @ 10V	61 @ 10V	97 @ 10V	58 @ 10V	39 @ 10V	62 @ 10V
Input Capacitance (Ciss) (pF)	1400 @ 25V	1400 @ 25V	1300 @ 25V	760 @ 25V	1100 @ 25V	1490 @ 25V
Power Dissipation (Max) (W)	150	150	140	79	100	128
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 150	-55 to 175	-55 to 175	-55 to 175
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent - Preferred Selection:

The IRF9540PBF (Vishay Siliconix) is the direct equivalent substitute for the obsolete IRF9540. This part maintains identical electrical specifications including 100V Vdss, 19A continuous drain current, 200mOhm Rds On, and 150W power dissipation. The IRF9540PBF is classified as Active product status with ROHS3 compliance and significantly higher inventory availability (55,400 units). The packaging is Tube format in TO-220AB configuration. This part is suitable for direct replacement in all applications where the IRF9540 was originally specified.

Alternative Equivalent - Cross-Manufacturer Option:

The IRF9540NPBF (Infineon Technologies, HEXFET® series) provides enhanced electrical performance with 23A continuous drain current and reduced Rds On of 117mOhm at 11A, 10V. This part maintains 100V Vdss, ±20V Vgs rating, and 140W power dissipation. Operating temperature range is -55°C to 150°C, which is 25°C lower than the original specification. The IRF9540NPBF is Active status with ROHS3 compliance and high inventory (65,200 units). This part is suitable for applications where improved current handling and reduced on-state losses are beneficial, provided the -55°C to 150°C temperature range is acceptable.

Functional Alternative - Lower Current Requirement:

The IRF9530NPBF (Infineon Technologies, HEXFET® series) is suitable for applications where continuous drain current requirements are 14A or lower. This part maintains 100V Vdss, 200mOhm Rds On, and ±20V Vgs rating. Power dissipation is rated at 79W, which is lower than the original 150W specification. Operating temperature range is -55°C to 175°C, matching the original specification. The IRF9530NPBF is Active status with ROHS3 compliance and very high inventory (125,400 units). This part is suitable for replacement in applications with reduced power dissipation requirements.

Functional Alternative - onsemi QFET® Series:

The FQP17P10 (onsemi, QFET® series) provides 100V Vdss with 16.5A continuous drain current and 190mOhm Rds On. This part supports ±30V Vgs (higher than the original ±20V) and is rated for 100W power dissipation. Operating temperature range is -55°C to 175°C, matching the original specification. The FQP17P10 is Active status with ROHS3 compliance and high inventory (15,434 units). This part is suitable for applications where the 16.5A current rating and 100W power dissipation are sufficient.

Functional Alternative - Infineon SIPMOS® Series:

The SPP15P10PLHXKSA1 (Infineon Technologies, SIPMOS® series) provides 100V Vdss with 15A continuous drain current and 200mOhm Rds On. This part features a lower gate threshold voltage of 2V at 1.54mA and supports ±20V Vgs. Power dissipation is rated at 128W. Operating temperature range is -55°C to 175°C, matching the original specification. The SPP15P10PLHXKSA1 is Active status with ROHS3 compliance. Inventory availability is limited (883 units). This part is suitable for applications where the 15A current rating and lower gate threshold voltage are beneficial.

Frequently Asked Questions (FAQ)

Q: Can the IRF9540PBF be used as a direct replacement for the obsolete IRF9540?

A: Yes. The IRF9540PBF is a direct equivalent with identical electrical specifications: 100V Vdss, 19A continuous drain current, 200mOhm Rds On, and 150W power dissipation. Both parts use the same TO-220AB package configuration. The IRF9540PBF is Active product status with ROHS3 compliance and high inventory availability.

Q: What is the difference between IRF9540PBF and IRF9540NPBF?

A: Both parts maintain 100V Vdss and 19A nominal current rating. The IRF9540NPBF (Infineon) offers improved performance with 23A continuous drain current and reduced Rds On of 117mOhm compared to the IRF9540PBF's 200mOhm. The IRF9540NPBF has a lower maximum operating temperature of 150°C versus 175°C for the IRF9540PBF. Both are Active status with ROHS3 compliance.

Q: Can I use the IRF9530NPBF if my application requires 19A continuous drain current?

A: No. The IRF9530NPBF is rated for 14A continuous drain current at 25°C, which is below the 19A requirement of the original IRF9540. Using this part in an application requiring 19A would result in thermal stress and potential device failure. The IRF9530NPBF is suitable only for applications with 14A or lower current requirements.

Q: What are the package differences between these substitute parts?

A: All substitute parts use Through Hole mounting in TO-220-3 or TO-220AB package configurations. The IRF9540PBF uses TO-220AB packaging in Tube format. The IRF9540NPBF, IRF9530NPBF, and SPP15P10PLHXKSA1 use TO-220AB or PG-TO220-3 packaging in Tube format. The FQP17P10 uses TO-220-3 packaging. All are mechanically compatible with the original IRF9540 footprint.

Q: Are all substitute parts RoHS compliant?

A: The original IRF9540 is RoHS non-compliant. All substitute parts listed (IRF9540PBF, IRF9540NPBF, IRF9530NPBF, FQP17P10, and SPP15P10PLHXKSA1) are ROHS3 compliant. This compliance status is important for new production applications subject to RoHS regulations.

Q: Which substitute part has the lowest on-state resistance (Rds On)?

A: The IRF9540NPBF has the lowest Rds On at 117mOhm at 11A, 10V. This is significantly lower than the original IRF9540's 200mOhm specification. Lower Rds On results in reduced power dissipation and heat generation during operation.

Q: What is the gate charge (Qg) difference between the substitute parts?

A: Gate charge values range from 39nC (FQP17P10) to 97nC (IRF9540NPBF). The original IRF9540 has 61nC gate charge. Lower gate charge reduces switching losses and allows faster switching speeds. The FQP17P10 offers the lowest gate charge at 39nC, while the IRF9540NPBF has the highest at 97nC.

Q: Can I use the FQP17P10 in place of the IRF9540 for high-power applications?

A: The FQP17P10 is rated for 100W maximum power dissipation, compared to the IRF9540's 150W rating. For applications requiring sustained power dissipation above 100W, the FQP17P10 is not suitable. The IRF9540PBF or IRF9540NPBF are better choices for high-power applications.

Q: What is the operating temperature range difference between substitute parts?

A: Most substitute parts support -55°C to 175°C, matching the original IRF9540 specification. The exception is the IRF9540NPBF, which has a maximum operating temperature of 150°C. For applications requiring operation above 150°C, the IRF9540NPBF is not suitable.

Q: Is the SPP15P10PLHXKSA1 a good choice for new designs?

A: The SPP15P10PLHXKSA1 is suitable for new designs where 15A continuous drain current and 128W power dissipation are sufficient. However, inventory availability is limited (883 units). For high-volume production, the IRF9540PBF or IRF9540NPBF are preferred due to significantly higher inventory levels and established supply chain availability.

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