IRL1104LPBF Equivalent & Substitute Parts Reference

Part Overview

The IRL1104LPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 104A continuous drain current at 25°C. This device is packaged in TO-262-3 (I2PAK) configuration and is designed for through-hole mounting applications. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges for this product category.

Substiute Parts

IRL1104LPBF

Infineon TechnologiesIn Stock: 4476IRL1104LPBF Datasheet

Current PartRFQ

IPI45N06S4L08AKSA1

Infineon TechnologiesIn Stock: 970IPI45N06S4L08AKSA1 Datasheet

MFR RecommendedRFQ

BUK7E8R3-40E,127

NXP USA Inc.In Stock: 2915BUK7E8R3-40E,127 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRL1104LPBF are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) must be equal to or greater than 40V
• Continuous Drain Current (Id) must support the application requirements
• On-state resistance (Rds On) must be within acceptable operating margins
• Gate threshold voltage (Vgs(th)) must be compatible with drive circuitry
• Operating temperature range must encompass -55°C to 175°C

Mechanical Compatibility Criteria:

• Package type must be TO-262-3 (I2PAK) or equivalent footprint
• Mounting type must be through-hole
• Pin configuration must match TO-262-3 standard

Substitution Logic: The IRL1104LPBF is listed with one manufacturer-recommended substitute: BUK7E8R3-40E,127 (NXP USA Inc.). This part maintains identical Vdss (40V), compatible Rds On characteristics (7.4mOhm @ 20A, 10V), matching package configuration (I2PAK/TO-262-3), and identical operating temperature range. The second listed part, IPI45N06S4L08AKSA1 (Infineon Technologies), represents an alternative with higher Vdss (60V) and lower continuous current rating (45A), suitable for applications where voltage margin is prioritized over current capacity.

Parameter Comparison

Engineering Selection Recommendations

BUK7E8R3-40E,127 (Primary Substitute): This NXP part is the manufacturer-recommended substitute for the IRL1104LPBF. It maintains identical voltage rating (40V) and package configuration (I2PAK/TO-262-3). The part is currently in active production status, ensuring long-term availability. It carries AEC-Q101 automotive qualification, providing additional reliability assurance for demanding applications. The lower gate charge (24 nC vs. 68 nC) and reduced input capacitance (1730 pF vs. 3445 pF) may improve switching performance in certain circuit topologies. This part is suitable for direct substitution in applications where the 75A continuous current rating meets system requirements.

IPI45N06S4L08AKSA1 (Alternative Substitute): This Infineon part offers higher voltage margin (60V vs. 40V) at the cost of reduced continuous current capacity (45A vs. 104A). It is ROHS3 compliant and maintains the same operating temperature range. This alternative is appropriate for applications where voltage headroom is critical or where current requirements do not exceed 45A. The higher input capacitance (4780 pF) may require gate drive circuit adjustment compared to the main part.

Selection Basis:

• Product status: Both substitutes are active production parts, ensuring supply chain continuity
• Compliance: Both parts meet REACH requirements; IPI45N06S4L08AKSA1 adds ROHS3 compliance
• Certifications: BUK7E8R3-40E,127 includes AEC-Q101 automotive qualification
• Electrical performance: BUK7E8R3-40E,127 provides closest electrical match with identical voltage rating

Frequently Asked Questions (FAQ)

Q: Can BUK7E8R3-40E,127 be used as a direct replacement for IRL1104LPBF?

A: BUK7E8R3-40E,127 is electrically and mechanically compatible for applications where continuous drain current does not exceed 75A. Both parts share identical 40V Vdss rating, TO-262-3 package configuration, and -55°C to 175°C operating temperature range. The lower gate charge and input capacitance may require verification of gate drive circuit performance in high-frequency switching applications.

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

A: BUK7E8R3-40E,127 maintains the 40V voltage rating with 75A current capacity, while IPI45N06S4L08AKSA1 increases voltage to 60V with reduced current to 45A. BUK7E8R3-40E,127 features lower gate charge (24 nC) and input capacitance (1730 pF), potentially improving switching speed. IPI45N06S4L08AKSA1 provides ROHS3 compliance and higher voltage margin for applications requiring additional safety headroom.

Q: Are the package footprints identical between all three parts?

A: All three parts use TO-262-3 package configuration suitable for through-hole mounting. BUK7E8R3-40E,127 is designated as I2PAK, and IPI45N06S4L08AKSA1 is designated as PG-TO262-3. These designations refer to the same physical footprint and pin configuration, ensuring PCB compatibility without layout modification.

Q: Why is the IRL1104LPBF classified as obsolete?

A: The IRL1104LPBF is no longer in active production by Infineon Technologies. Substitute parts from both Infineon (IPI45N06S4L08AKSA1) and NXP (BUK7E8R3-40E,127) are available as active production alternatives to support ongoing system requirements and new designs.

Q: What is the impact of different gate threshold voltages on circuit design?

A: The IRL1104LPBF has Vgs(th) of 1V @ 250µA, while BUK7E8R3-40E,127 has 4V @ 1mA and IPI45N06S4L08AKSA1 has 2.2V @ 35µA. Higher threshold voltages require higher gate drive voltage to achieve full on-state conduction. Gate drive circuits must be verified to ensure adequate voltage margin above the threshold voltage for reliable switching operation.

Q: Which substitute part is recommended for new designs?

A: BUK7E8R3-40E,127 is the manufacturer-recommended substitute, offering identical voltage rating, compatible current capacity, and active production status. For applications requiring higher voltage margin or ROHS3 compliance, IPI45N06S4L08AKSA1 is suitable if current requirements do not exceed 45A.