IRLR3103TR N-Channel MOSFET 30V 55A Equivalent & Substitute Parts

Part Overview

The IRLR3103TR is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the TO-252AA (DPAK) package. This device operates at 30V drain-to-source voltage with a continuous drain current rating of 55A at 25°C and maximum power dissipation of 107W. The product is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	55	A
Rds On (Max) @ Id, Vgs	19 mOhm @ 33A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	1	V @ 250µA
Gate Charge (Qg) @ 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

Substitute Part Grouping Explanation

Substitution of the IRLR3103TR is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): 30V minimum
Package Type: TO-252-3 (DPAK) surface mount configuration
FET Type: N-Channel MOSFET technology
Operating Temperature Range: -55°C to 175°C minimum

Performance Consideration Parameters:

Continuous Drain Current (Id): Substitute must meet or exceed 55A at 25°C
On-State Resistance (Rds On): Substitute must not exceed 19 mOhm at specified conditions
Gate Charge (Qg): Lower values indicate faster switching characteristics
Power Dissipation: Substitute must support minimum 107W thermal rating

The AOD480 is identified as a manufacturer-recommended substitute. However, this device exhibits reduced continuous drain current (25A versus 55A) and lower power dissipation (21W Tc versus 107W Tc), indicating it functions as a partial equivalent suitable only for applications with lower current requirements.

Parameter Comparison

Parameter	IRLR3103TR (Main)	AOD480 (Substitute)	Unit
Manufacturer	Infineon Technologies	Alpha & Omega Semiconductor Inc.	-
Drain to Source Voltage (Vdss)	30	30	V
Continuous Drain Current (Id) @ 25°C	55	25	A (Tc)
Rds On (Max) @ Id, Vgs	19 mOhm @ 33A, 10V	23 mOhm @ 20A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	1 V @ 250µA	2.5 V @ 250µA	V
Gate Charge (Qg) @ Vgs	50 nC @ 4.5V	14 nC @ 10V	nC
Power Dissipation (Max)	107 (Tc)	21 (Tc)	W
Operating Temperature Range	-55 to 175	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	TO-252-3 (DPAK)	Surface Mount
Vgs (Max)	±16	±20	V
Input Capacitance (Ciss) @ Vds	1600 pF @ 25V	820 pF @ 15V	pF
Product Status	Obsolete	Not For New Designs	-
RoHS Status	RoHS non-compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

For Direct Replacement (Full Current Applications):

The IRLR3103TR is classified as Obsolete. Direct replacement with equivalent 55A-rated N-Channel MOSFETs in TO-252 package should be evaluated based on availability and compliance requirements. The AOD480 does not provide full current equivalence and is unsuitable for applications requiring the full 55A continuous drain current specification.

For Reduced Current Applications:

The AOD480 (Alpha & Omega Semiconductor Inc.) is suitable for applications requiring maximum 25A continuous drain current. This substitute maintains voltage equivalence (30V Vdss) and package compatibility (TO-252 DPAK). The AOD480 provides improved RoHS3 compliance status compared to the non-compliant IRLR3103TR. Gate charge is significantly lower (14 nC versus 50 nC), resulting in faster switching response.

Compliance Considerations:

The IRLR3103TR is RoHS non-compliant. The AOD480 is ROHS3 compliant, making it preferable for applications subject to RoHS regulations. Both devices are REACH Unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the AOD480 directly replace the IRLR3103TR in all applications?

A: No. The AOD480 has a maximum continuous drain current of 25A compared to the IRLR3103TR's 55A rating. Direct substitution is only valid for applications requiring 25A or less. Applications requiring the full 55A specification require alternative solutions.

Q: What are the key electrical differences between these devices?

A: The primary differences are continuous drain current (55A versus 25A), power dissipation (107W versus 21W), gate threshold voltage (1V versus 2.5V), and gate charge (50 nC versus 14 nC). Both maintain identical 30V Vdss rating and TO-252 package configuration.

Q: Are there package compatibility concerns?

A: Both devices use the TO-252-3 (DPAK) surface mount package with identical pinout and footprint. No PCB layout modifications are required for package substitution.

Q: What is the significance of the lower gate charge in the AOD480?

A: Lower gate charge (14 nC versus 50 nC) indicates reduced gate drive requirements and faster switching transitions. This may improve circuit efficiency in high-frequency switching applications but does not affect DC operating characteristics.

Q: Why is the IRLR3103TR classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The AOD480 is classified as "Not For New Designs," indicating limited availability and manufacturer recommendation against use in new product development.

Q: Does RoHS compliance affect electrical performance?

A: RoHS compliance relates to material composition and environmental standards, not electrical performance. The AOD480's ROHS3 compliance provides regulatory advantage for applications subject to RoHS requirements without altering electrical characteristics.

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