IXFK50N50 N-Channel 500V 50A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFK50N50 is an N-Channel 500V 50A MOSFET manufactured by IXYS in the HiPerFET™ series, housed in a TO-264AA through-hole package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The part delivers 560W maximum power dissipation and operates across the industrial temperature range of -55°C to 150°C.

Due to its obsolete status, equivalent and substitute parts are necessary for ongoing system support, design continuity, and procurement of replacement inventory. Active alternatives with comparable electrical characteristics and identical package configurations are available from IXYS and other manufacturers.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	50	A
On-State Resistance (Rds On) @ 25A, 10V	80	mOhm
Gate Threshold Voltage (Vgs(th)) @ 8mA	4.5	V
Gate Charge (Qg) @ 10V	330	nC
Input Capacitance (Ciss) @ 25V	9400	pF
Maximum Gate Voltage (Vgs)	±20	V
Power Dissipation (Max)	560	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-264AA	Through Hole
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IXFK50N50 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): 500V (exact match required)
Package Type: TO-264AA or TO-264-3 (mechanical compatibility)
FET Type: N-Channel (functional requirement)
Technology: MOSFET Metal Oxide (device class)
Operating Temperature Range: -55°C to 150°C (thermal envelope)

Allowable Variation Parameters:

Continuous Drain Current (Id): Substitutes must equal or exceed 50A
On-State Resistance (Rds On): Lower values are acceptable (improved performance)
Gate Charge (Qg): Lower values are acceptable (reduced switching losses)
Power Dissipation: Higher values are acceptable (improved thermal capability)
Maximum Gate Voltage (Vgs): Equal or higher values are acceptable

Substitute parts are grouped into three categories based on their relationship to the main part: direct manufacturer equivalents (same manufacturer, enhanced specifications), manufacturer-recommended alternatives (same manufacturer, comparable specifications), and similar cross-manufacturer options (different manufacturer, equivalent electrical performance).

Parameter Comparison

Parameter	IXFK50N50	IXFK94N50P2	IXFK44N50P	APT56M50L	FQL40N50F
Manufacturer	IXYS	IXYS	IXYS	Microchip Technology	onsemi
Vdss (V)	500	500	500	500	500
Id @ 25°C (A)	50	94	44	56	40
Rds On (mOhm)	80 @ 25A	55 @ 500mA	140 @ 22A	100 @ 28A	110 @ 20A
Vgs(th) (V)	4.5 @ 8mA	5 @ 8mA	5 @ 4mA	5 @ 2.5mA	5 @ 250µA
Qg (nC)	330 @ 10V	220 @ 10V	98 @ 10V	220 @ 10V	200 @ 10V
Ciss (pF)	9400 @ 25V	13700 @ 25V	5440 @ 25V	8800 @ 25V	7500 @ 25V
Vgs Max (V)	±20	±30	±30	±30	±30
Power Dissipation (W)	560	1300	658	780	460
Package	TO-264AA	TO-264AA	TO-264AA	TO-264	TO-264-3
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IXFK94N50P2 (Direct Manufacturer Equivalent)

The IXFK94N50P2 is an active IXYS HiPerFET™ and PolarP2™ series device that exceeds the electrical specifications of the IXFK50N50 across all critical parameters. It provides 94A continuous drain current versus 50A, 1300W power dissipation versus 560W, and reduced on-state resistance of 55mOhm. The device maintains identical 500V Vdss rating and TO-264AA package configuration. Maximum gate voltage is increased to ±30V, providing enhanced gate drive flexibility. This part is currently in active production with 43,400 units in stock, ensuring long-term availability. ROHS3 compliance and REACH unaffected status match the original part. Selection of this device provides superior thermal performance and current handling capacity within the same package footprint.

IXFK44N50P (Manufacturer-Recommended Alternative)

The IXFK44N50P is an active IXYS HiPerFET™ and Polar series device rated for 44A continuous drain current, slightly below the original 50A specification. This part is recommended by the manufacturer as a direct alternative and maintains 500V Vdss, TO-264AA package, and identical operating temperature range. Power dissipation of 658W exceeds the original 560W rating. On-state resistance of 140mOhm is higher than the original 80mOhm, resulting in increased conduction losses. Gate charge is significantly reduced to 98nC, improving switching performance. Maximum gate voltage is ±30V. This device is in active production with 2,130 units available. ROHS3 compliance and REACH unaffected status are maintained. Selection of this device is appropriate for applications where the 44A current rating is sufficient and reduced gate charge is beneficial.

APT56M50L (Cross-Manufacturer Equivalent)

The APT56M50L is an active Microchip Technology N-Channel 500V MOSFET rated for 56A continuous drain current, exceeding the original 50A specification. The device is housed in a TO-264 through-hole package, mechanically compatible with TO-264AA applications. Vdss of 500V, operating temperature range of -55°C to 150°C, and power dissipation of 780W all meet or exceed original specifications. On-state resistance of 100mOhm is higher than the original 80mOhm. Gate charge of 220nC and input capacitance of 8800pF are comparable to the original device. Maximum gate voltage is ±30V. This part is in active production with 1,812 units in stock. ROHS3 compliance and REACH unaffected status are maintained. Selection of this device provides cross-manufacturer sourcing flexibility with equivalent electrical performance.

FQL40N50F (Cross-Manufacturer Alternative)

The FQL40N50F is an obsolete onsemi FRFET® series N-Channel 500V MOSFET rated for 40A continuous drain current, below the original 50A specification. The device is housed in a TO-264-3 through-hole package, mechanically compatible with TO-264AA applications. Vdss of 500V and operating temperature range of -55°C to 150°C match the original part. Power dissipation of 460W is lower than the original 560W rating. On-state resistance of 110mOhm and gate charge of 200nC are comparable to the original device. Maximum gate voltage is ±30V. This part is obsolete with 18,700 units currently in stock. ROHS3 compliance and REACH unaffected status are maintained. Selection of this device is limited to applications where the 40A current rating is acceptable and existing inventory must be utilized.

Frequently Asked Questions (FAQ)

Q: Can the IXFK94N50P2 be used as a direct replacement for the IXFK50N50?

A: Yes. The IXFK94N50P2 is electrically and mechanically compatible with the IXFK50N50. Both devices share identical 500V Vdss rating, TO-264AA package configuration, and -55°C to 150°C operating temperature range. The IXFK94N50P2 exceeds the original specifications in continuous drain current (94A vs. 50A), power dissipation (1300W vs. 560W), and on-state resistance (55mOhm vs. 80mOhm). No circuit modifications are required for substitution.

Q: What is the primary difference between the IXFK44N50P and the IXFK50N50?

A: The IXFK44N50P is rated for 44A continuous drain current compared to the IXFK50N50's 50A rating. This represents a 12% reduction in current capacity. On-state resistance is higher at 140mOhm versus 80mOhm, resulting in increased conduction losses. Gate charge is significantly lower at 98nC versus 330nC, reducing switching losses. Both devices maintain 500V Vdss and TO-264AA package compatibility. Selection depends on whether the 44A current rating is sufficient for the application.

Q: Are the APT56M50L and FQL40N50F pin-compatible with the IXFK50N50?

A: Both devices are housed in TO-264 series packages (APT56M50L in TO-264, FQL40N50F in TO-264-3) and are mechanically compatible with the TO-264AA package of the IXFK50N50. Pin configurations for N-Channel MOSFETs in these package variants are standardized. Physical mounting and electrical connection are compatible without modification.

Q: Why is the IXFK50N50 listed as obsolete?

A: The IXFK50N50 has been discontinued by IXYS and is no longer in active production. Obsolete status indicates that the manufacturer no longer manufactures this device for new orders. Existing inventory remains available, but long-term supply cannot be guaranteed. Active alternatives such as the IXFK94N50P2 and IXFK44N50P are recommended for new designs and ongoing procurement.

Q: What does RoHS3 compliance mean for these devices?

A: ROHS3 compliance indicates that all substitute parts meet the Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials including lead, mercury, cadmium, and certain flame retardants. All listed substitute parts maintain ROHS3 compliance, ensuring environmental and regulatory compatibility with the original IXFK50N50.

Q: Can I use the FQL40N50F in an application requiring 50A continuous current?

A: No. The FQL40N50F is rated for 40A continuous drain current, which is 10A below the IXFK50N50's 50A specification. Using this device in an application requiring 50A would exceed its rated current capacity, resulting in thermal stress, reduced device lifetime, and potential failure. The FQL40N50F is suitable only for applications where the 40A rating is sufficient.

Q: What is the significance of gate charge (Qg) differences between these devices?

A: Gate charge directly affects switching speed and switching losses in the gate drive circuit. Lower gate charge values reduce the energy required to switch the device on and off, decreasing switching losses and improving efficiency. The IXFK44N50P has the lowest gate charge at 98nC, while the IXFK50N50 has 330nC. In high-frequency switching applications, devices with lower gate charge may provide improved performance.

Q: Are all substitute parts available in the same packaging options?

A: The IXFK50N50, IXFK94N50P2, and IXFK44N50P are all available in TO-264AA packages. The APT56M50L is available in TO-264 packaging, and the FQL40N50F is available in TO-264-3 packaging. While these are all TO-264 series variants with compatible pin configurations, physical dimensions may vary slightly. Verification of PCB footprint compatibility is recommended before final design implementation.

Q: What is the REACH status, and why is it important?

A: REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) is a European Union regulation governing chemical safety. "REACH Unaffected" status indicates that the device does not contain substances of very high concern (SVHC) listed under REACH regulations. All listed substitute parts maintain REACH Unaffected status, ensuring compliance with international chemical safety requirements.

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