IRLR3103PBF N-Channel 30V 55A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR3103PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage and 55A continuous drain current in a Surface Mount TO-252AA (DPAK) package. This device is part of the HEXFET® series and is classified as discontinued at DiGi Electronics. Due to its discontinued status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	55	A (Tc)
Rds On (Max) @ Id, Vgs	19 mOhm @ 33A, 10V	mOhm
Gate Threshold Voltage Vgs(th) (Max) @ Id	1	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	50	nC @ 4.5V
Power Dissipation (Max)	107	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3, DPAK	Surface Mount
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the IRLR3103PBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Package Type: Must be Surface Mount TO-252 or compatible DPAK variant
FET Type: N-Channel MOSFET technology
RoHS Compliance: ROHS3 Compliant status required

Secondary Compatibility Factors:

Continuous Drain Current (Id): Substitute parts may have lower current ratings if application requirements permit
Rds On (Max): Lower on-resistance values are acceptable; higher values require thermal analysis
Gate Charge (Qg): Affects switching speed and driver requirements
Operating Temperature Range: Minimum -55°C to 150°C acceptable for most applications

The substitute parts listed below meet the primary criteria. Variations in current rating, on-resistance, and gate charge reflect different device architectures and thermal characteristics within the same voltage class and package family.

Parameter Comparison

Parameter	IRLR3103PBF (Main)	AOD480	DMG4468LK3-13	DMG4800LK3-13	ZXMN3A04KTC
Manufacturer	Infineon Technologies	Alpha & Omega Semiconductor	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Vdss (V)	30	30	30	30	30
Id @ 25°C (A)	55 (Tc)	25 (Tc)	9.7 (Ta)	10 (Ta)	12 (Ta)
Rds On (Max) @ Vgs 10V (mOhm)	19 @ 33A	23 @ 20A	16 @ 11.6A	17 @ 9A	20 @ 12A
Vgs(th) (Max) @ 250µA (V)	1	2.5	1.95	1.6	1
Gate Charge Qg (Max) (nC)	50 @ 4.5V	14 @ 10V	18.85 @ 10V	8.7 @ 5V	36.8 @ 10V
Power Dissipation (Max) (W)	107 (Tc)	21 (Tc)	1.68 (Ta)	1.71 (Ta)	2.15 (Ta)
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 150	-55 to 150	-55 to 150
Package	TO-252-3 DPAK	TO-252 DPAK	TO-252-3	TO-252-3	U-DFN2020-6 (Type B)
Product Status	Discontinued at DiGi Electronics	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For High-Current Applications (≥25A continuous): The AOD480 from Alpha & Omega Semiconductor is the primary substitute when current requirements remain in the 25A range. It maintains the same 30V Vdss rating, TO-252 DPAK package compatibility, and ROHS3 compliance. However, AOD480 carries a "Not For New Designs" status, limiting its suitability for new product development. The AOD480 is suitable only for legacy system maintenance or production continuity of existing designs.

For Active Product Lines and New Designs: DMG4800LK3-13 and DMG4468LK3-13 from Diodes Incorporated are recommended substitutes. Both devices are classified as Active and ROHS3 compliant. These parts maintain 30V Vdss rating and TO-252-3 DPAK package compatibility. Current ratings are reduced (10A and 9.7A respectively), requiring thermal and circuit analysis to confirm suitability for applications originally designed for 55A operation.

For Automotive and Qualified Applications: ZXMN3A04KTC from Diodes Incorporated is qualified to AEC-Q101 automotive standards and carries Active product status. This device provides 30V Vdss and 12A continuous current in a U-DFN2020-6 package. The different package type (6-UDFN Exposed Pad versus TO-252-3) requires PCB layout modification and thermal management reassessment.

Compliance and Regulatory Considerations: All substitute parts listed maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification, matching the regulatory profile of the IRLR3103PBF.

Frequently Asked Questions (FAQ)

Q: Can AOD480 directly replace IRLR3103PBF in existing designs? A: AOD480 shares the same 30V Vdss rating and TO-252 DPAK package. However, its 25A continuous current rating is significantly lower than the original 55A specification. Direct substitution is only valid if circuit analysis confirms that actual operating current does not exceed 25A. AOD480 carries "Not For New Designs" status, making it unsuitable for new product development.

Q: Why do DMG4468LK3-13 and DMG4800LK3-13 have lower current ratings? A: These devices from Diodes Incorporated represent different silicon architectures optimized for lower current operation within the same 30V voltage class. Lower current ratings reflect different die sizes and thermal characteristics. These parts are suitable only for applications where actual drain current remains below 10A.

Q: Is ZXMN3A04KTC compatible with existing PCB layouts designed for IRLR3103PBF? A: No. ZXMN3A04KTC uses a U-DFN2020-6 package, which differs from the TO-252-3 DPAK package of the original part. PCB layout modification, including pad pattern changes and thermal management redesign, is required. This substitution is not a direct drop-in replacement.

Q: What is the significance of the "Not For New Designs" status on AOD480? A: This designation indicates that the manufacturer is not recommending this part for new product development. While AOD480 may remain available for legacy system support and production continuity, it should not be selected for new designs. Active-status alternatives such as DMG4800LK3-13 or DMG4468LK3-13 are preferred for new applications.

Q: How do gate charge differences affect circuit design? A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. IRLR3103PBF has 50 nC @ 4.5V, while substitutes range from 8.7 nC to 36.8 nC. Lower gate charge reduces driver power dissipation and switching losses. Higher gate charge may require driver circuit optimization. Driver capability must be verified for each substitute part.

Q: Can I use multiple lower-current MOSFETs in parallel to replace the IRLR3103PBF? A: Parallel operation of MOSFETs is possible but requires careful circuit design to ensure current sharing, thermal management, and gate drive synchronization. This approach is beyond the scope of direct substitution and requires detailed engineering analysis.

Q: What thermal considerations apply when substituting to lower-current parts? A: Lower current-rated parts typically have higher on-resistance (Rds On) at equivalent gate voltages, resulting in higher power dissipation at the same current levels. Thermal analysis must confirm that junction temperature remains within the -55°C to 150°C operating range for substitute parts, which have lower maximum operating temperatures (150°C) compared to the original IRLR3103PBF (175°C).

Q: Are all substitute parts available in the same packaging options? A: No. While AOD480, DMG4468LK3-13, and DMG4800LK3-13 use TO-252-3 DPAK variants, ZXMN3A04KTC uses U-DFN2020-6 packaging. Package selection affects PCB layout, thermal performance, and assembly compatibility. Verify packaging availability and compatibility with your manufacturing process before final selection.

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