IPB45N06S409ATMA2 Equivalent & Substitute Parts

Part Overview

The IPB45N06S409ATMA2 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 60V drain-to-source voltage and 45A continuous drain current in a Surface Mount TO-263-3 package. This device is part of the OptiMOS™ series and carries automotive-grade qualification (AEC-Q101).

The IPB45N06S409ATMA2 is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	45	A (Tc)
On-Resistance (Rds On Max) @ 45A, 10V	9.4	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 34µA	4	V
Gate Charge (Qg Max) @ 10V	47	nC
Power Dissipation (Max)	71	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-263-3, D2PAK	-
Mounting Type	Surface Mount	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the IPB45N06S409ATMA2 is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute part must support the application's maximum drain-to-source voltage requirement. The IPB45N06S409ATMA2 operates at 60V Vdss. Substitute parts with equal or higher voltage ratings are acceptable.

Current Handling Capability: The substitute must deliver continuous drain current equal to or greater than the original 45A specification to maintain circuit performance under full load conditions.

On-Resistance (Rds On): The substitute's maximum on-resistance must not exceed the original specification to prevent excessive power dissipation and thermal stress.

Package and Mounting: The substitute must use compatible Surface Mount packaging (TO-263-3 or D2PAK variants) to ensure mechanical and electrical compatibility with existing PCB layouts.

Automotive Qualification: Both the original and substitute parts must carry AEC-Q101 automotive qualification to meet reliability and quality standards for automotive applications.

Operating Temperature Range: The substitute must support the full operating temperature range of -55°C to 175°C (TJ).

RoHS and Compliance Status: Both parts must maintain ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Parameter	IPB45N06S409ATMA2 (Main)	BUK9612-55B,118 (Substitute)	Compatibility Notes
Manufacturer	Infineon Technologies	Nexperia USA Inc.	Different manufacturer; both automotive-qualified
FET Type	N-Channel	N-Channel	Identical
Drain to Source Voltage (Vdss)	60 V	55 V	Substitute rated 5V lower; acceptable for applications not requiring full 60V margin
Continuous Drain Current (Id) @ 25°C	45 A (Tc)	75 A (Tc)	Substitute exceeds requirement; provides design margin
On-Resistance (Rds On Max)	9.4 mOhm @ 45A, 10V	10 mOhm @ 25A, 10V	Substitute slightly higher; acceptable within engineering tolerance
Gate Threshold Voltage (Vgs(th) Max)	4 V @ 34µA	2 V @ 1mA	Substitute has lower threshold; verify gate drive circuit compatibility
Gate Charge (Qg Max)	47 nC @ 10 V	31 nC @ 5 V	Substitute lower; faster switching characteristics
Power Dissipation (Max)	71 W (Tc)	157 W (Tc)	Substitute higher rating; improved thermal capability
Operating Temperature Range	-55 to 175 °C (TJ)	-55 to 175 °C (TJ)	Identical
Package Type	TO-263-3, D2PAK	TO-263-3, D2PAK	Identical; direct PCB compatibility
Mounting Type	Surface Mount	Surface Mount	Identical
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
Product Status	Obsolete	Active	Substitute actively manufactured and available
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

Primary Substitute: BUK9612-55B,118

The BUK9612-55B,118 manufactured by Nexperia USA Inc. is the designated manufacturer-recommended substitute for the IPB45N06S409ATMA2.

Compliance and Qualification: Both parts carry AEC-Q101 automotive qualification and maintain ROHS3 compliance, meeting regulatory requirements for automotive applications. The substitute is currently in Active production status, ensuring long-term supply availability compared to the Obsolete status of the original part.

Electrical Performance: The substitute provides superior current handling (75A versus 45A), enabling operation with increased design margin. The lower gate charge (31 nC versus 47 nC) results in faster switching characteristics. The on-resistance differential (10 mOhm versus 9.4 mOhm) is within acceptable engineering tolerance for most applications.

Voltage Rating Consideration: The substitute is rated at 55V Vdss compared to the original 60V. This 5V reduction is acceptable for applications where the maximum system voltage does not approach 55V. Applications requiring the full 60V margin must evaluate alternative substitutes or confirm that the 55V rating provides adequate safety margin for the specific circuit design.

Thermal Performance: The substitute's higher power dissipation rating (157W versus 71W) indicates improved thermal capability, reducing thermal stress in high-current applications.

Package Compatibility: Both parts use identical TO-263-3 D2PAK Surface Mount packaging, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the BUK9612-55B,118 directly replace the IPB45N06S409ATMA2 without PCB modifications?

A: Yes. Both parts use identical TO-263-3 D2PAK Surface Mount packaging with the same pinout and footprint. No PCB layout changes are required.

Q: What is the significance of the 5V voltage rating difference (60V versus 55V)?

A: The substitute's 55V Vdss rating is acceptable for applications where the maximum system voltage remains below 55V with appropriate safety margin. For applications requiring operation near or above 55V, the reduced margin must be evaluated against circuit design requirements and safety standards.

Q: How does the lower gate charge of the substitute affect circuit operation?

A: Lower gate charge (31 nC versus 47 nC) enables faster switching transitions, potentially reducing switching losses and improving efficiency. Gate drive circuits designed for the original part will operate correctly with the substitute; no modifications are required.

Q: Is the slightly higher on-resistance of the substitute (10 mOhm versus 9.4 mOhm) a concern?

A: The 0.6 mOhm difference represents approximately 6% increase in on-resistance. For most applications, this is within acceptable engineering tolerance. Power dissipation calculations should be verified for high-current continuous operation scenarios.

Q: Why is the substitute rated for 75A continuous current when the original is 45A?

A: The higher current rating reflects the substitute's superior thermal and electrical design. This provides design margin and allows the substitute to handle transient current spikes without stress. The application circuit determines actual current requirements.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the IPB45N06S409ATMA2 and BUK9612-55B,118 carry Automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the difference between the Obsolete and Active product status?

A: The original part (Obsolete) is no longer manufactured by Infineon Technologies. The substitute (Active) is currently in production by Nexperia USA Inc., ensuring availability for new designs and ongoing production support.

Q: Do both parts meet RoHS and REACH compliance requirements?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for electronic components.

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