IRFR7446PBF N-Channel MOSFET 40V 56A Equivalent & Substitute Parts

Part Overview

The IRFR7446PBF is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the TO-252AA (DPAK) package. This device operates at 40V drain-to-source voltage with a continuous drain current rating of 56A at 25°C and maximum power dissipation of 98W. The part is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	56	A
On-State Resistance (Rds On Max) @ 56A, 10V	3.9	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 100µA	3.9	V
Gate Charge (Qg Max) @ 10V	130	nC
Power Dissipation (Max)	98	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the IRFR7446PBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
Continuous Drain Current (Id): Must equal or exceed 56A at 25°C
On-State Resistance (Rds On): Must not exceed 3.9 mOhm at rated current and gate voltage
Package Type: Must be TO-252-3 (DPAK) or equivalent surface mount package
FET Technology: N-Channel MOSFET (Metal Oxide)
Operating Temperature Range: Must support -55°C to 175°C

Substitution Logic: Parts meeting or exceeding these parameters in all categories are classified as direct substitutes. The STD120N4F6 from STMicroelectronics meets the electrical requirements with higher current capability (80A) and improved power dissipation (110W), while maintaining identical voltage rating and compatible package configuration.

Parameter Comparison

Parameter	IRFR7446PBF (Infineon)	STD120N4F6 (STMicroelectronics)	Unit
Manufacturer	Infineon Technologies	STMicroelectronics	—
FET Type	N-Channel	N-Channel	—
Drain to Source Voltage (Vdss)	40	40	V
Continuous Drain Current (Id) @ 25°C	56	80	A
Rds On (Max) @ Rated Current, 10V	3.9 @ 56A	4.0 @ 40A	mOhm
Gate Threshold Voltage (Vgs(th) Max)	3.9 @ 100µA	4.0 @ 250µA	V
Gate Charge (Qg Max) @ 10V	130	65	nC
Power Dissipation (Max)	98	110	W
Operating Temperature Range	-55 to 175	-55 to 175	°C
Package Type	TO-252-3 (DPAK)	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

STD120N4F6 as Primary Substitute:

The STD120N4F6 qualifies as a direct substitute for the IRFR7446PBF based on electrical parameter compatibility. Both devices share identical 40V Vdss rating and compatible package configuration (TO-252-3 DPAK). The STD120N4F6 provides superior performance margins with 80A continuous drain current versus 56A, and 110W power dissipation versus 98W.

Compliance Considerations:

Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. The STD120N4F6 carries AEC-Q101 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Product Status Impact:

The IRFR7446PBF is discontinued at DiGi Electronics. The STD120N4F6 is classified as obsolete but maintains documented availability through authorized distributors. For new designs or long-term procurement, evaluation of actively produced alternatives from the STD120 base product family is recommended based on specific application current and thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the STD120N4F6 directly replace the IRFR7446PBF in existing circuit designs?

A: Yes. Both devices share identical 40V Vdss rating, compatible TO-252-3 (DPAK) package configuration, and overlapping operating temperature ranges (-55°C to 175°C). The STD120N4F6 provides higher current capability (80A vs. 56A) and power dissipation (110W vs. 98W), making it suitable for applications designed around the IRFR7446PBF specifications.

Q: What are the key electrical differences between these two MOSFETs?

A: The primary differences are continuous drain current (STD120N4F6: 80A vs. IRFR7446PBF: 56A) and gate charge (STD120N4F6: 65 nC vs. IRFR7446PBF: 130 nC). The STD120N4F6 exhibits lower gate charge, resulting in faster switching characteristics. On-state resistance values are comparable (4.0 mOhm vs. 3.9 mOhm), with measurements taken at different reference currents.

Q: Are there package compatibility concerns when substituting these parts?

A: No. Both devices use the TO-252-3 (DPAK) surface mount package with identical pin configuration and thermal tab design. PCB layout and thermal management considerations remain unchanged during substitution.

Q: What compliance certifications apply to both parts?

A: Both the IRFR7446PBF and STD120N4F6 are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. The STD120N4F6 additionally holds AEC-Q101 automotive qualification. Both parts are REACH unaffected and classified under ECCN EAR99.

Q: How do gate charge differences affect circuit performance?

A: The STD120N4F6 exhibits 50% lower gate charge (65 nC vs. 130 nC), resulting in reduced gate drive energy requirements and faster switching transitions. This characteristic benefits high-frequency switching applications and reduces driver IC power consumption. Circuit designs must verify gate driver capability remains adequate for the substitute device.

Q: What is the significance of the AEC-Q101 qualification on the STD120N4F6?

A: AEC-Q101 qualification indicates the STD120N4F6 meets automotive industry reliability and quality standards. This certification is relevant for applications requiring automotive-grade component assurance, though it does not restrict use in non-automotive applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message