IXFP12N50PM N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IXFP12N50PM is an N-Channel MOSFET manufactured by IXYS, rated for 500V drain-to-source voltage with 6A continuous drain current at 25°C. This device is housed in a TO-220-3 through-hole package and is designed for high-voltage switching applications. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	6	A
On-State Resistance (Rds On) @ 6A, 10V	500	mOhm
Gate Threshold Voltage (Vgs(th)) @ 1mA	5.5	V
Gate Charge (Qg) @ 10V	29	nC
Power Dissipation (Max)	50	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IXFP12N50PM requires evaluation of electrical and mechanical compatibility based on the following criteria:

Voltage Rating Compatibility: The substitute part must support the application's maximum drain-to-source voltage requirement. The IXFP12N50PM operates at 500V; therefore, substitute devices must have a Vdss rating equal to or greater than this specification.

Current Handling Capability: The substitute must support the continuous drain current requirement of 6A at 25°C or higher. Devices with higher current ratings remain compatible for applications requiring 6A or less.

On-State Resistance (Rds On): The substitute's Rds On value determines power dissipation and thermal performance. Lower Rds On values indicate improved efficiency and reduced heat generation.

Gate Drive Voltage: The substitute must be compatible with the available gate drive voltage, specified at 10V for the IXFP12N50PM.

Package and Mounting: The substitute must use the same through-hole TO-220-3 package format to ensure mechanical compatibility with existing printed circuit board layouts.

Temperature Range: The substitute's operating temperature range must encompass the application's thermal requirements.

Regulatory Compliance: Both the main part and substitute must maintain equivalent RoHS and REACH compliance status.

Parameter Comparison

Parameter	IXFP12N50PM	IRFI3205PBF	Unit	Compatibility Notes
Drain to Source Voltage (Vdss)	500	55	V	IRFI3205PBF rated for lower voltage; suitable only for applications ≤55V
Continuous Drain Current (Id) @ 25°C	6	64	A	IRFI3205PBF provides higher current capacity
On-State Resistance (Rds On)	500 @ 6A, 10V	8 @ 34A, 10V	mOhm	IRFI3205PBF exhibits significantly lower on-state resistance
Gate Threshold Voltage (Vgs(th))	5.5 @ 1mA	4 @ 250µA	V	Both within standard gate drive compatibility range
Gate Charge (Qg) @ 10V	29	170	nC	IRFI3205PBF requires higher gate charge for switching
Power Dissipation (Max)	50	63	W	IRFI3205PBF supports higher power dissipation
Operating Temperature Range	-55 to 150	-55 to 175	°C	IRFI3205PBF supports extended upper temperature limit
Package Type	TO-220-3	TO-220-3 Full Pack	—	Both use through-hole TO-220 format; mechanical compatibility confirmed
Product Status	Obsolete	Active	—	IRFI3205PBF maintains active production status
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	Equivalent compliance certification
REACH Status	REACH Unaffected	REACH Unaffected	—	Equivalent compliance certification

Engineering Selection Recommendations

Voltage Derating Consideration: The IRFI3205PBF operates at a maximum Vdss of 55V, which is substantially lower than the IXFP12N50PM's 500V rating. Direct substitution is limited to applications where the circuit voltage does not exceed 55V. For high-voltage applications requiring 500V operation, the IRFI3205PBF is not suitable.

Current and Thermal Performance: The IRFI3205PBF provides superior current handling (64A versus 6A) and lower on-state resistance (8 mOhm versus 500 mOhm). These characteristics result in reduced power dissipation and improved thermal efficiency for low-voltage applications within its voltage rating.

Gate Drive Compatibility: Both devices operate with 10V gate drive voltage and maintain compatible gate threshold voltages. The IRFI3205PBF requires higher gate charge (170 nC versus 29 nC), which may necessitate evaluation of gate driver circuit capability.

Product Status and Availability: The IXFP12N50PM is obsolete, while the IRFI3205PBF maintains active production status. For new designs or long-term procurement, the IRFI3205PBF offers supply continuity within its electrical specifications.

Regulatory Compliance: Both devices maintain equivalent RoHS3 and REACH compliance certifications, ensuring regulatory alignment for applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can the IRFI3205PBF directly replace the IXFP12N50PM in all applications?

A: No. The IRFI3205PBF is suitable only for applications operating at 55V or below. The IXFP12N50PM's 500V rating cannot be matched by the IRFI3205PBF. Substitution is application-specific and depends on the circuit's maximum operating voltage.

Q: What is the primary difference between these two MOSFETs?

A: The IXFP12N50PM is designed for high-voltage (500V) applications with moderate current (6A), while the IRFI3205PBF is optimized for low-voltage (55V) applications with high current (64A). These represent different design categories within the MOSFET product spectrum.

Q: Are the packages mechanically compatible?

A: Yes. Both devices use through-hole TO-220-3 package formats, ensuring mechanical compatibility with standard TO-220 footprints on printed circuit boards. The IRFI3205PBF uses a Full-Pak variant, which maintains the same pin configuration and mounting requirements.

Q: Does the IRFI3205PBF require different gate drive circuitry?

A: The gate drive voltage (10V) remains compatible. However, the IRFI3205PBF requires higher gate charge (170 nC versus 29 nC), which may demand evaluation of the gate driver's current sourcing capability to ensure adequate switching speed and performance.

Q: What compliance certifications apply to both devices?

A: Both the IXFP12N50PM and IRFI3205PBF maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment for applications subject to these environmental and hazardous substance restrictions.

Q: Why is the IXFP12N50PM listed as obsolete?

A: The IXFP12N50PM is classified as obsolete by the manufacturer, indicating discontinued production. The IRFI3205PBF maintains active production status, providing supply continuity for applications within its electrical specifications.

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