IRF1302S Equivalent & Substitute Parts

Part Overview

The IRF1302S is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the D2PAK package. This device features a 20V drain-to-source voltage rating with a continuous drain current of 174A at 25°C and a maximum power dissipation of 200W. The IRF1302S is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

IRF1302S

Infineon TechnologiesIn Stock: 3459IRF1302S Datasheet

Current PartRFQ

BUK964R4-40B,118

Nexperia USA Inc.In Stock: 8192BUK964R4-40B,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF1302S is based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute part must support the application voltage requirements. The IRF1302S operates at 20V Vdss; substitute parts with equal or higher voltage ratings are acceptable.

Current Handling Capacity: The substitute must support continuous drain current at or above the application requirement. The IRF1302S provides 174A; substitute parts with equal or higher current ratings maintain functional equivalence.

On-Resistance (Rds On): The substitute must maintain comparable or lower on-resistance to ensure thermal performance and efficiency. The IRF1302S specifies 4mOhm maximum at specified conditions.

Package and Mounting: The substitute must use the same D2PAK surface mount package to ensure mechanical and thermal compatibility with existing PCB designs.

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

The BUK964R4-40B,118 meets these substitution criteria with a higher voltage rating (40V), lower current rating (75A), comparable on-resistance (4mOhm), and identical package type (D2PAK).

Parameter Comparison

Engineering Selection Recommendations

The BUK964R4-40B,118 is an active product with current manufacturing support, addressing the obsolescence status of the IRF1302S. This substitute provides higher voltage rating (40V versus 20V), enabling use in applications with higher supply voltages while maintaining compatibility in 20V applications.

The substitute exhibits lower continuous drain current (75A versus 174A), which is acceptable for applications where the full 174A capacity of the IRF1302S is not required. The on-resistance remains equivalent at 4mOhm, ensuring comparable thermal performance.

The BUK964R4-40B,118 carries ROHS3 compliance and AEC-Q101 automotive qualification, providing enhanced regulatory and quality assurance status compared to the non-compliant IRF1302S. Both devices support the full operating temperature range of -55°C to 175°C and use identical D2PAK surface mount packaging.

Frequently Asked Questions (FAQ)

Q: Can the BUK964R4-40B,118 directly replace the IRF1302S in existing designs?

A: Direct replacement is possible when the application does not require the full 174A continuous drain current of the IRF1302S. The substitute's 75A rating and higher 40V voltage rating are compatible with 20V applications. PCB layout and thermal management remain unchanged due to identical D2PAK packaging.

Q: What are the key differences between these two parts?

A: The primary differences are voltage rating (20V versus 40V), continuous drain current (174A versus 75A), and product status (obsolete versus active). Both maintain equivalent on-resistance and operating temperature range. The substitute offers improved regulatory compliance (ROHS3) and automotive qualification (AEC-Q101).

Q: Is the lower current rating of the substitute a limitation?

A: The lower current rating applies only to applications requiring continuous drain current above 75A. For applications operating at or below 75A continuous current, the substitute provides full functional equivalence with superior voltage margin and regulatory compliance.

Q: Are the packages mechanically identical?

A: Yes. Both the IRF1302S and BUK964R4-40B,118 use the D2PAK (TO-263-3) surface mount package with identical pinout and thermal characteristics. No PCB modifications are required for mechanical compatibility.

Q: What is the impact of the higher voltage rating on circuit performance?

A: The 40V rating of the substitute provides additional voltage margin in 20V applications without affecting circuit operation. The device will function identically at 20V operation. Higher voltage rating does not degrade performance in lower voltage applications.

Q: Does the substitute meet current regulatory requirements?

A: Yes. The BUK964R4-40B,118 is ROHS3 compliant and carries AEC-Q101 automotive qualification, meeting current regulatory standards. The IRF1302S is RoHS non-compliant, making the substitute preferable for new designs and compliance-sensitive applications.