IXFH42N50P2 Equivalent & Substitute Parts

Part Overview

The IXFH42N50P2 is an N-Channel MOSFET rated for 500V drain-to-source voltage with 42A continuous drain current at 25°C. This device is packaged in a TO-247AD through-hole configuration and is part of the HiPerFET™ and PolarP2™ series from IXYS. The part carries a Last Time Buy product status, indicating that the original manufacturer has discontinued or will discontinue production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	42	A
On-State Resistance (Rds On Max) @ 10V	145	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 4mA	4.5	V
Gate Charge (Qg Max) @ 10V	92	nC
Power Dissipation (Max)	830	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247AD	—
FET Type	N-Channel	—

Substitute Part Grouping Explanation

Substitution of the IXFH42N50P2 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 500V
Continuous Drain Current (Id): Must equal or exceed 42A at 25°C
On-State Resistance (Rds On): Must not exceed 145 mOhm at specified gate voltage
Gate Threshold Voltage (Vgs(th)): Must be compatible with 4.5V maximum specification
Package Type: TO-247 family (TO-247AD or TO-247AC acceptable for through-hole mounting)
Operating Temperature Range: Must support -55°C to 150°C
Compliance: RoHS3 compliant, REACH unaffected

Manufacturer-Recommended Substitute: The IXFH44N50P from IXYS meets all primary criteria with improved specifications (44A continuous drain current, 140 mOhm Rds On) and maintains Active product status, ensuring ongoing availability and support.

Similar Substitutes: The IRFP360LCPBF and SIHG25N50E-GE3 are listed as similar alternatives but present trade-offs in voltage rating or current capacity that require application-level evaluation.

Parameter Comparison

Parameter	IXFH42N50P2 (Main)	IXFH44N50P (MFR Recommended)	IRFP360LCPBF (Similar)	SIHG25N50E-GE3 (Similar)
Manufacturer	IXYS	IXYS	Vishay Siliconix	Vishay Siliconix
Vdss (V)	500	500	400	500
Id @ 25°C (A)	42	44	23	26
Rds On Max @ 10V (mOhm)	145	140	200	145
Vgs(th) Max @ 4mA (V)	4.5	5	4	4
Qg Max @ 10V (nC)	92	98	110	86
Power Dissipation Max (W)	830	658	280	250
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-247AD	TO-247AD	TO-247AC	TO-247AC
Product Status	Last Time Buy	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

IXFH44N50P (Manufacturer-Recommended Substitute): This part is the primary substitute for the IXFH42N50P2. It is manufactured by IXYS and maintains the same 500V voltage rating and TO-247AD package configuration. The IXFH44N50P provides higher continuous drain current (44A versus 42A) and lower on-state resistance (140 mOhm versus 145 mOhm), making it a direct performance upgrade. The part holds Active product status, ensuring long-term availability and manufacturer support. All compliance certifications (RoHS3, REACH unaffected) are maintained. This substitute is suitable for direct replacement in existing designs without circuit modification.

IRFP360LCPBF (Similar Substitute - Voltage Trade-Off): This Vishay Siliconix device operates at 400V maximum drain-to-source voltage, which is 100V lower than the IXFH42N50P2. The continuous drain current is also reduced to 23A. This part is suitable only for applications where the 500V rating is not required and where the lower current capacity is acceptable. The part maintains Active status and full compliance certifications.

SIHG25N50E-GE3 (Similar Substitute - Current Trade-Off): This Vishay Siliconix device maintains the 500V voltage rating but provides only 26A continuous drain current compared to the 42A of the original part. The on-state resistance is equivalent at 145 mOhm. This part is suitable for applications with reduced current requirements. The part maintains Active status and full compliance certifications. Package configuration is TO-247AC, which is mechanically compatible with TO-247AD in through-hole mounting applications.

Frequently Asked Questions (FAQ)

Q: Can the IXFH44N50P be used as a direct replacement for the IXFH42N50P2?

A: Yes. The IXFH44N50P is the manufacturer-recommended substitute and provides equivalent or superior electrical performance across all critical parameters. Both devices share the same 500V voltage rating, TO-247AD package, and operating temperature range. The IXFH44N50P offers higher current capacity (44A versus 42A) and lower on-state resistance (140 mOhm versus 145 mOhm), making it a direct upgrade suitable for existing circuit designs without modification.

Q: What is the difference between TO-247AD and TO-247AC packages?

A: Both TO-247AD and TO-247AC are through-hole mounted packages in the TO-247 family with identical pin configurations and mechanical footprints. The primary difference is internal die configuration and thermal characteristics. For through-hole PCB mounting applications, both packages are mechanically compatible. However, thermal performance may differ; consult thermal management requirements for your specific application.

Q: Why is the IXFH42N50P2 listed as Last Time Buy?

A: Last Time Buy status indicates that IXYS has discontinued or will discontinue production of this part. This status necessitates identifying alternative parts to ensure supply chain continuity. The IXFH44N50P is the recommended successor from the same manufacturer and series.

Q: Can I use the IRFP360LCPBF in place of the IXFH42N50P2?

A: The IRFP360LCPBF is not a direct substitute. It operates at a maximum of 400V drain-to-source voltage (100V lower than the original) and provides only 23A continuous drain current (19A lower than the original). This part is suitable only for applications where both the lower voltage rating and reduced current capacity are acceptable. Circuit redesign or derating analysis may be required.

Q: Can I use the SIHG25N50E-GE3 in place of the IXFH42N50P2?

A: The SIHG25N50E-GE3 maintains the 500V voltage rating but provides only 26A continuous drain current compared to the 42A of the original part. This represents a 38% reduction in current capacity. This part is suitable only for applications with reduced current requirements. The on-state resistance is equivalent at 145 mOhm. Circuit derating or redesign may be required depending on application current demands.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The IXFH44N50P, IRFP360LCPBF, and SIHG25N50E-GE3 are all RoHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original IXFH42N50P2.

Q: What is the primary criterion for selecting a substitute?

A: The primary criterion is ensuring that the substitute part meets or exceeds the original part's drain-to-source voltage (500V) and continuous drain current (42A) ratings. Secondary criteria include on-state resistance, gate charge, and power dissipation requirements specific to your application. The IXFH44N50P satisfies all primary criteria with improved performance and Active product status.

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