IRL1104S N-Channel 40V 104A MOSFET Equivalent & Substitute Parts

Part Overview

The IRL1104S is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 104A continuous drain current at Tc. The device is housed in a D2PAK (TO-263-3) surface mount package and is designed for high-current switching applications. The IRL1104S is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across voltage rating, package type, and thermal performance characteristics while meeting current application requirements.

Key Parameters

Parameter	IRL1104S	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	104 (Tc)	A
Rds On (Max) @ Id, Vgs	8 mOhm @ 62A, 10V	mOhm
Gate Charge (Qg) @ Vgs	68 nC @ 4.5V	nC
Vgs(th) (Max) @ Id	1 V @ 250µA	V
Input Capacitance (Ciss) @ Vds	3445 pF @ 25V	pF
Power Dissipation (Max)	2.4W (Ta), 167W (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRL1104S is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 40V
Package Type: Must be D2PAK (TO-263-3) surface mount
Continuous Drain Current (Id): Must support application requirements at rated conditions
Operating Temperature Range: Must span -55°C to 175°C (TJ)
Rds On characteristics: Must be compatible with circuit switching requirements
Gate Charge (Qg): Must be within acceptable limits for driver circuit compatibility

Substitute Parts Identified:

All four substitute parts maintain the 40V Vdss rating and D2PAK package configuration. Substitutes differ in continuous drain current ratings, on-resistance characteristics, and gate charge specifications. Selection depends on whether the application requires the full 104A capability of the original part or can operate within the reduced current ratings of available alternatives.

Parameter Comparison

Parameter	IRL1104S (Infineon)	AOB4184 (Alpha & Omega)	BUK9609-40B,118 (Nexperia)	FDB8445 (onsemi)	PSMN8R0-40BS,118 (Nexperia)	Unit
Vdss	40	40	40	40	40	V
Id (Tc) @ 25°C	104	50	75	70	77	A
Rds On (Max) @ 10V	8 mOhm @ 62A	10 mOhm @ 20A	7 mOhm @ 25A	9 mOhm @ 70A	7.6 mOhm @ 25A	mOhm
Gate Charge (Qg)	68 nC @ 4.5V	35 nC @ 10V	32 nC @ 5V	62 nC @ 10V	21 nC @ 10V	nC
Ciss (Max)	3445 pF @ 25V	1800 pF @ 20V	3600 pF @ 25V	3805 pF @ 25V	1262 pF @ 12V	pF
Power Dissipation (Tc)	167	50	157	92	86	W
Operating Temperature	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	°C (TJ)
Package	D2PAK (TO-263-3)	TO-263 (D2PAK)	D2PAK (TO-263-3)	TO-263 (D2PAK)	D2PAK (TO-263-3)	—
Product Status	Obsolete	Active	Active	Obsolete	Active	—
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

For Applications Requiring Full 104A Capability:

The IRL1104S delivers 104A continuous drain current at Tc. Among the substitute parts listed, none achieve this current rating. BUK9609-40B,118 (75A) and PSMN8R0-40BS,118 (77A) provide the closest current performance. Selection between these two depends on circuit requirements:

BUK9609-40B,118 is qualified to AEC-Q101 automotive standards and carries active product status with ROHS3 compliance. Power dissipation at Tc is 157W, closely matching the original part's 167W rating.
PSMN8R0-40BS,118 offers lower gate charge (21 nC) and lower input capacitance (1262 pF), which may reduce driver circuit stress. Power dissipation is 86W at Tc.

For Applications with Reduced Current Requirements:

AOB4184 (50A) is suitable for applications requiring 50A or less. It provides the lowest gate charge (35 nC) and lowest input capacitance (1800 pF) among all substitutes, reducing driver circuit complexity. Active product status and ROHS3 compliance support long-term availability.
FDB8445 (70A) offers moderate current capability with 92W power dissipation at Tc. Product status is obsolete, limiting long-term supply reliability.

Compliance Considerations:

All substitute parts are ROHS3 compliant, whereas the IRL1104S is non-compliant. This transition supports regulatory requirements for new designs. BUK9609-40B,118 includes AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability documentation.

Thermal Performance:

Applications with high thermal demands should prioritize BUK9609-40B,118 (157W at Tc) or the original IRL1104S (167W at Tc). Lower power dissipation substitutes (AOB4184 at 50W, PSMN8R0-40BS,118 at 86W) are appropriate for moderate thermal environments or reduced current operation.

Frequently Asked Questions (FAQ)

Q: Can AOB4184 directly replace IRL1104S in all applications?

A: AOB4184 is a direct package and voltage substitute but is rated for 50A continuous drain current versus the IRL1104S's 104A. Substitution is valid only if the application operates at or below 50A. Circuit redesign or thermal management adjustments may be necessary for applications originally designed for the full 104A capability.

Q: What is the significance of gate charge differences between substitutes?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge (PSMN8R0-40BS,118 at 21 nC) reduces driver circuit power consumption and switching losses. Higher gate charge (FDB8445 at 62 nC) may require more robust driver circuits. Selection depends on driver circuit design and switching frequency requirements.

Q: Are all substitute parts suitable for automotive applications?

A: BUK9609-40B,118 carries AEC-Q101 automotive qualification. AOB4184, FDB8445, and PSMN8R0-40BS,118 do not list automotive qualification. For automotive applications, BUK9609-40B,118 is the recommended substitute.

Q: Why is product status important in selecting a substitute?

A: Active product status (AOB4184, BUK9609-40B,118, PSMN8R0-40BS,118) indicates ongoing manufacturing and long-term availability. Obsolete status (IRL1104S, FDB8445) indicates discontinued production, limiting future supply. For new designs or long-term production, active parts are preferred.

Q: Can I use PSMN8R0-40BS,118 if my circuit requires high current switching?

A: PSMN8R0-40BS,118 is rated for 77A continuous drain current at Tc, which is below the IRL1104S's 104A rating. Use is valid only if circuit analysis confirms operation at or below 77A. For applications requiring sustained operation above 77A, alternative solutions or circuit redesign is necessary.

Q: What does ROHS3 compliance mean for part selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All substitute parts are ROHS3 compliant, supporting regulatory compliance for new designs. The original IRL1104S is non-compliant, making substitution necessary for applications with ROHS compliance requirements.

Q: How do input capacitance differences affect circuit design?

A: Input capacitance (Ciss) affects gate drive circuit design and switching speed. PSMN8R0-40BS,118 has the lowest Ciss (1262 pF), enabling faster switching and lower driver stress. Higher Ciss values (FDB8445 at 3805 pF, BUK9609-40B,118 at 3600 pF) may require stronger driver circuits or longer switching times. Selection depends on circuit switching frequency and driver capability.

Q: Is thermal management different between the IRL1104S and its substitutes?

A: Yes. The IRL1104S dissipates 167W at Tc, while substitutes range from 50W (AOB4184) to 157W (BUK9609-40B,118). Applications originally designed for the IRL1104S may require heatsink adjustments if substituting with lower power-rated parts. Conversely, lower power dissipation substitutes may allow simplified thermal management.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message