IRFP9240 P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRFP9240 is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Vishay Siliconix, rated for 200V drain-to-source voltage with 12A continuous drain current at 25°C and 150W maximum power dissipation. The device is housed in a TO-247AC through-hole package and is classified as obsolete product status. Due to its obsolete classification, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	200	V
Current - Continuous Drain (Id) @ 25°C	12	A
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	500 mOhm @ 7.2A, 10V	—
Power Dissipation (Max)	150	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IRFP9240 P-Channel MOSFET is determined by the following critical parameters:

Electrical Compatibility Requirements:

FET Type: P-Channel topology must be maintained
Drain to Source Voltage (Vdss): Minimum 200V rating required
Current - Continuous Drain (Id): Minimum 12A at 25°C required
Drive Voltage: 10V gate drive compatibility
Operating Temperature Range: -55°C to 150°C minimum coverage required

Mechanical Compatibility Requirements:

Package Type: TO-247-3 form factor
Mounting Type: Through-hole configuration

Substitute parts are grouped into two categories: direct equivalents (identical electrical and mechanical specifications) and functional upgrades (enhanced electrical performance within the same package and voltage class).

Parameter Comparison

Parameter	IRFP9240	IRFP9240PBF	IXTH24P20
Manufacturer	Vishay Siliconix	Vishay Siliconix	IXYS
FET Type	P-Channel	P-Channel	P-Channel
Drain to Source Voltage (Vdss)	200 V	200 V	200 V
Current - Continuous Drain (Id) @ 25°C	12 A	12 A	24 A
Drive Voltage (Max Rds On)	10 V	10 V	10 V
Rds On (Max) @ Id, Vgs	500 mOhm @ 7.2A, 10V	500 mOhm @ 7.2A, 10V	150 mOhm @ 500mA, 10V
Gate Charge (Qg) (Max) @ Vgs	44 nC @ 10 V	44 nC @ 10 V	150 nC @ 10 V
Vgs (Max)	±20 V	±20 V	±20 V
Input Capacitance (Ciss) (Max) @ Vds	1200 pF @ 25 V	1200 pF @ 25 V	4200 pF @ 25 V
Power Dissipation (Max)	150 W	150 W	300 W
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package Type	TO-247-3	TO-247-3	TO-247-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRFP9240PBF (Direct Equivalent)

The IRFP9240PBF is a direct electrical and mechanical equivalent to the IRFP9240. Both devices share identical electrical specifications including 200V Vdss, 12A continuous drain current, 500 mOhm Rds(on), and 150W power dissipation. The primary distinction is product status: IRFP9240PBF maintains active product status, ensuring ongoing availability and supply chain continuity. Additionally, IRFP9240PBF carries ROHS3 compliance certification, whereas the original IRFP9240 is non-compliant. For applications requiring regulatory compliance with modern environmental standards, IRFP9240PBF is the preferred direct replacement.

IXTH24P20 (Functional Upgrade)

The IXTH24P20 manufactured by IXYS is a functional upgrade within the same voltage class and package family. It maintains the 200V Vdss rating and TO-247-3 through-hole package, ensuring mechanical compatibility. The IXTH24P20 provides enhanced electrical performance with doubled continuous drain current (24A versus 12A) and doubled power dissipation capability (300W versus 150W). The Rds(on) is significantly lower at 150 mOhm, reducing conduction losses. However, the IXTH24P20 exhibits higher gate charge (150 nC versus 44 nC) and input capacitance (4200 pF versus 1200 pF), which may affect gate drive circuit design. The IXTH24P20 is ROHS3 compliant and maintains active product status. This device is suitable for applications where thermal performance or current handling capacity requires enhancement beyond the original IRFP9240 specifications.

Frequently Asked Questions (FAQ)

Q: Can IRFP9240PBF be used as a direct replacement for IRFP9240 in existing designs?

A: Yes. IRFP9240PBF is electrically and mechanically identical to IRFP9240. All electrical parameters, including Vdss, Id, Rds(on), and power dissipation, are equivalent. The TO-247-3 package and through-hole mounting are identical. No circuit modifications are required. The primary advantage is that IRFP9240PBF is an active product with ROHS3 compliance.

Q: What are the limitations when substituting IXTH24P20 for IRFP9240?

A: IXTH24P20 is a functional upgrade, not a direct equivalent. While it maintains 200V Vdss and TO-247-3 packaging, it introduces higher gate charge (150 nC versus 44 nC) and significantly higher input capacitance (4200 pF versus 1200 pF). Gate drive circuits designed for IRFP9240 may require redesign to accommodate these increased capacitive loads. The lower Rds(on) (150 mOhm versus 500 mOhm) reduces conduction losses but may alter thermal behavior in the circuit. Verification of gate drive capability and thermal management is necessary before implementation.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. Both IRFP9240PBF and IXTH24P20 use the TO-247-3 package with identical pin configuration and through-hole mounting. PCB layouts designed for IRFP9240 accommodate both substitutes without modification. However, thermal design considerations may differ due to the IXTH24P20's higher power dissipation capability and different thermal characteristics.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS compliance indicates conformance to the Restriction of Hazardous Substances directive, restricting lead and other hazardous materials. IRFP9240 is RoHS non-compliant, while both IRFP9240PBF and IXTH24P20 are ROHS3 compliant. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, IRFP9240PBF or IXTH24P20 must be selected.

Q: How do the electrical performance differences between IRFP9240 and IXTH24P20 affect circuit design?

A: The IXTH24P20 provides superior electrical performance with doubled current capacity (24A versus 12A) and doubled power dissipation (300W versus 150W), resulting in lower Rds(on) (150 mOhm versus 500 mOhm). These improvements reduce conduction losses and heat generation. However, the higher gate charge and input capacitance require gate drive circuits with greater current capability. Applications operating near the thermal or current limits of IRFP9240 benefit from IXTH24P20 substitution, provided gate drive circuitry is verified for compatibility.

Q: Is inventory availability a factor in selecting between IRFP9240PBF and IXTH24P20?

A: Inventory levels are provided for reference: IRFP9240PBF has 10,100 pieces in stock, while IXTH24P20 has 1,096 pieces in stock. For applications requiring immediate availability, IRFP9240PBF offers superior supply assurance. For applications where performance enhancement justifies longer lead times, IXTH24P20 remains available.

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