IRL1104L N-Channel MOSFET 40V 104A Equivalent & Substitute Parts

Part Overview

The IRL1104L 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 requiring high current switching capability.

The IRL1104L is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	104	A
On-State Resistance (Rds On) @ 62A, 10V	8	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1	V
Gate Charge (Qg) @ 4.5V	68	nC
Input Capacitance (Ciss) @ 25V	3445	pF
Maximum Gate Voltage (Vgs)	±16	V
Operating Temperature Range	-55 to 175	°C
Package Type	TO-262-3	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRL1104L is determined by the following critical electrical and mechanical parameters:

Voltage Rating (Vdss): The substitute must support the same or higher drain-to-source voltage to ensure safe operation in the original circuit topology.

Current Rating (Id): The substitute must support equal or greater continuous drain current at 25°C to handle the same load conditions without thermal stress.

On-State Resistance (Rds On): Lower or equivalent on-state resistance ensures comparable power dissipation and thermal performance.

Gate Threshold Voltage (Vgs(th)): Must be compatible with the gate drive voltage levels used in the original circuit.

Package and Mounting: Mechanical compatibility with TO-262-3 through-hole configuration is required for direct board-level substitution.

Operating Temperature Range: Must support the full -55°C to 175°C operating window.

Two substitute parts are identified based on these criteria:

IPI45N06S4L08AKSA1 (Infineon Technologies, OptiMOS™ series) — Active product with higher voltage rating (60V) and lower current rating (45A), suitable for applications where voltage margin is prioritized.
BUK7E8R3-40E,127 (NXP USA Inc., TrenchMOS™ series) — Active product with matched voltage rating (40V) and lower current rating (75A), featuring automotive qualification and AEC-Q101 certification.

Parameter Comparison

Parameter	IRL1104L (Main Part)	IPI45N06S4L08AKSA1	BUK7E8R3-40E,127	Unit
Manufacturer	Infineon Technologies	Infineon Technologies	NXP USA Inc.	—
Product Status	Obsolete	Active	Active	—
FET Type	N-Channel	N-Channel	N-Channel	—
Vdss	40	60	40	V
Id @ 25°C	104	45	75	A
Rds On (Max)	8 @ 62A, 10V	8.2 @ 45A, 10V	7.4 @ 20A, 10V	mOhm
Vgs(th) (Max)	1 @ 250µA	2.2 @ 35µA	4 @ 1mA	V
Qg (Max)	68 @ 4.5V	64 @ 10V	24 @ 10V	nC
Ciss (Max)	3445 @ 25V	4780 @ 25V	1730 @ 25V	pF
Vgs (Max)	±16	±16	±20	V
Operating Temperature	-55 to 175	-55 to 175	-55 to 175	°C
Package	TO-262-3	PG-TO262-3	I2PAK	—
Mounting Type	Through Hole	Through Hole	Through Hole	—
RoHS Status	Non-compliant	ROHS3 Compliant	Not specified	—

Engineering Selection Recommendations

For IPI45N06S4L08AKSA1 Selection:

This substitute is an active product from Infineon Technologies with ROHS3 compliance. The 60V voltage rating provides additional design margin above the original 40V specification. However, the 45A continuous drain current is significantly lower than the IRL1104L's 104A rating. This substitute is suitable only for applications where the actual circuit current demand does not exceed 45A. The OptiMOS™ series technology offers modern manufacturing standards and long-term availability. Gate threshold voltage of 2.2V requires verification against existing gate drive circuitry.

For BUK7E8R3-40E,127 Selection:

This substitute is an active product from NXP USA Inc. with matched 40V voltage rating and automotive-grade qualification (AEC-Q101). The 75A continuous drain current is lower than the IRL1104L's 104A but higher than the Infineon alternative. The TrenchMOS™ technology provides lower on-state resistance (7.4mOhm) and significantly reduced gate charge (24nC), which may improve switching performance and reduce gate drive power requirements. The higher gate threshold voltage (4V) requires circuit compatibility verification. This part is suitable for applications where current demand is between 45A and 75A and where automotive-grade reliability is beneficial.

General Considerations:

Both substitutes are active products with superior compliance status compared to the obsolete IRL1104L. Direct substitution is not possible due to current rating differences. Circuit redesign or derating analysis is required to confirm compatibility with the actual application current profile.

Frequently Asked Questions (FAQ)

Q: Can the IPI45N06S4L08AKSA1 directly replace the IRL1104L in all applications?

A: No. While both are N-Channel MOSFETs in TO-262-3 packages, the IPI45N06S4L08AKSA1 is rated for only 45A continuous drain current compared to the IRL1104L's 104A. Direct substitution is only valid for applications where the actual circuit current does not exceed 45A. Applications requiring the full 104A capability require alternative solutions or circuit redesign.

Q: What is the primary difference between the two substitute parts?

A: The IPI45N06S4L08AKSA1 offers higher voltage rating (60V vs. 40V) with lower current capacity (45A). The BUK7E8R3-40E,127 maintains the 40V voltage rating with intermediate current capacity (75A) and includes automotive-grade qualification. The BUK7E8R3-40E,127 also features significantly lower gate charge (24nC vs. 68nC), which reduces gate drive power requirements.

Q: Are there any gate drive circuit modifications required when substituting these parts?

A: Yes. The gate threshold voltage differs between parts. The IRL1104L has Vgs(th) of 1V, while the IPI45N06S4L08AKSA1 has 2.2V and the BUK7E8R3-40E,127 has 4V. Existing gate drive circuits must be verified to ensure adequate gate voltage margin above the threshold voltage of the selected substitute. The reduced gate charge in the BUK7E8R3-40E,127 may allow optimization of gate drive resistor values.

Q: Which substitute is better for high-frequency switching applications?

A: The BUK7E8R3-40E,127 features lower gate charge (24nC) and lower input capacitance (1730pF), which reduces switching losses and gate drive power dissipation. This makes it more suitable for high-frequency applications. The IPI45N06S4L08AKSA1 has higher gate charge (64nC) and higher input capacitance (4780pF), resulting in greater switching losses at elevated frequencies.

Q: Is RoHS compliance important for my application?

A: The IPI45N06S4L08AKSA1 is ROHS3 compliant, while the IRL1104L is non-compliant. If your application or end-market requires RoHS compliance, the IPI45N06S4L08AKSA1 is the only option among the substitutes. The BUK7E8R3-40E,127 RoHS status is not specified in the provided data.

Q: Can I use the BUK7E8R3-40E,127 in automotive applications?

A: Yes. The BUK7E8R3-40E,127 carries automotive-grade qualification and AEC-Q101 certification, making it suitable for automotive and industrial applications requiring enhanced reliability standards. The other substitutes do not carry automotive qualification.

Q: What is the impact of different on-state resistance values on thermal performance?

A: The IRL1104L has 8mOhm Rds On at 62A/10V. The IPI45N06S4L08AKSA1 has 8.2mOhm at 45A/10V, and the BUK7E8R3-40E,127 has 7.4mOhm at 20A/10V. Lower on-state resistance reduces I²R power dissipation. However, direct thermal comparison requires analysis at the actual operating current of your circuit, as Rds On values are specified at different current levels.

Q: Are the package dimensions identical between these parts?

A: All three parts use TO-262-3 package variants (I2PAK configuration) suitable for through-hole mounting. The IRL1104L uses TO-262-3 Long Leads, the IPI45N06S4L08AKSA1 uses PG-TO262-3, and the BUK7E8R3-40E,127 uses I2PAK. While mechanically compatible for board mounting, pin-to-pin dimensions should be verified against PCB layout before final assembly.

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