AUIRFP4409 Equivalent & Substitute Parts

Part Overview

The AUIRFP4409 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 300V drain-to-source voltage with 38A continuous drain current at 25°C. This device is packaged in TO-247AC configuration and is designed for high-voltage switching applications requiring through-hole mounting. The AUIRFP4409 carries an Obsolete product status, making identification of functionally equivalent substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	300	V
Continuous Drain Current (Id) @ 25°C	38	A
Rds On (Max) @ Id, Vgs	69	mOhm @ 24A, 10V
Gate Charge (Qg) (Max) @ Vgs	125	nC @ 10V
Input Capacitance (Ciss) (Max) @ Vds	5168	pF @ 50V
Power Dissipation (Max)	341	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-247-3	Through Hole
Gate Voltage (Vgs) Max	±20	V

Substitute Part Grouping Explanation

Substitution of the AUIRFP4409 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Drain to Source Voltage (Vdss): 300V minimum
Package Type: TO-247-3 through-hole configuration
FET Type: N-Channel MOSFET
Gate Voltage Rating (Vgs): ±20V or greater

Allowable Variation Parameters:

Continuous Drain Current (Id): Equal to or greater than 38A
Rds On (Max): Equal to or less than 69mOhm (lower resistance is acceptable)
Gate Charge (Qg): Equal to or less than 125nC (lower charge is acceptable)
Input Capacitance (Ciss): Equal to or less than 5168pF (lower capacitance is acceptable)
Power Dissipation: Equal to or greater than 341W (higher dissipation capability is acceptable)

The STW46NF30 meets all mandatory matching parameters and demonstrates acceptable variation within allowable electrical specifications.

Parameter Comparison

Parameter	AUIRFP4409 (Infineon)	STW46NF30 (STMicroelectronics)	Compatibility Status
Drain to Source Voltage (Vdss)	300V	300V	Match
Continuous Drain Current (Id) @ 25°C	38A	42A	Substitute Exceeds
Rds On (Max) @ Id, Vgs	69mOhm @ 24A, 10V	75mOhm @ 17A, 10V	Acceptable Variation
Gate Charge (Qg) (Max) @ Vgs	125nC @ 10V	90nC @ 10V	Substitute Lower
Input Capacitance (Ciss) (Max) @ Vds	5168pF @ 50V	3200pF @ 25V	Substitute Lower
Power Dissipation (Max)	341W	300W	Acceptable Variation
Operating Temperature Range	-55 to 175°C	175°C (TJ)	Acceptable Variation
Package Type	TO-247-3	TO-247-3	Match
Gate Voltage (Vgs) Max	±20V	±20V	Match
FET Type	N-Channel MOSFET	N-Channel MOSFET	Match
Mounting Type	Through Hole	Through Hole	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

The STW46NF30 from STMicroelectronics is a direct functional substitute for the obsolete AUIRFP4409. Selection is based on the following engineering criteria:

Compliance and Regulatory Status: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for applications subject to environmental restrictions.

Product Status Consideration: The AUIRFP4409 is classified as Obsolete, while the STW46NF30 maintains Active product status with substantial inventory availability (625,701 pieces in stock versus 2,525 pieces for the original part). This availability differential supports long-term supply chain continuity.

Electrical Performance: The STW46NF30 delivers equivalent or superior electrical performance across all critical parameters. The 42A continuous drain current rating exceeds the 38A requirement, providing design margin. Lower gate charge (90nC versus 125nC) and input capacitance (3200pF versus 5168pF) result in improved switching characteristics and reduced driver circuit stress.

Thermal and Mechanical Compatibility: Both devices utilize identical TO-247-3 through-hole packaging, ensuring direct mechanical compatibility with existing PCB layouts and thermal management solutions. The STW46NF30 power dissipation rating of 300W remains within acceptable thermal design parameters for applications originally specified for 341W.

Application Suitability: The STW46NF30 is suitable for direct substitution in high-voltage switching applications including power supplies, motor control circuits, and industrial switching converters where the original AUIRFP4409 was specified.

Frequently Asked Questions (FAQ)

Q: Can the STW46NF30 be used as a direct pin-for-pin replacement for the AUIRFP4409?

A: Yes. Both devices share identical TO-247-3 package pinout and gate voltage specifications (±20V). No circuit modifications are required for mechanical or electrical interface compatibility.

Q: What is the significance of the higher drain current rating (42A versus 38A) on the STW46NF30?

A: The higher current rating provides design margin and thermal headroom. Applications operating at or below 38A continuous current will experience improved reliability and reduced junction temperature under identical load conditions.

Q: How do the gate charge differences affect circuit design?

A: The STW46NF30 gate charge of 90nC is lower than the AUIRFP4409 specification of 125nC. This reduction decreases switching losses and reduces driver circuit current requirements, resulting in improved overall system efficiency.

Q: Are there packaging or inventory considerations for the STW46NF30?

A: The STW46NF30 is supplied in Tube packaging and maintains active production status with 625,701 pieces in stock. This availability contrasts with the obsolete AUIRFP4409 status and supports both immediate procurement and long-term supply security.

Q: Do both components meet the same regulatory and compliance standards?

A: Yes. Both the AUIRFP4409 and STW46NF30 are ROHS3 compliant and REACH unaffected, ensuring equivalent regulatory status for applications subject to environmental restrictions.

Q: What is the operating temperature capability of the STW46NF30 compared to the original part?

A: The STW46NF30 is rated to 175°C junction temperature, matching the upper limit of the AUIRFP4409 operating range (-55 to 175°C). Applications requiring the full -55°C lower temperature specification should verify STW46NF30 performance at minimum operating temperature.

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