AUIRLS3114Z N-Channel 40V 56A MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRLS3114Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage and 56A continuous drain current in a Surface Mount TO-252AA (DPAK) package. This device is part of the HEXFET® series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability and, in many cases, enhanced performance characteristics through modern manufacturing processes.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	56	A
On-State Resistance (Rds On) @ 56A, 10V	4.9	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 100µA	2.5	V
Gate Charge (Qg) @ 4.5V	53	nC
Maximum Gate-Source Voltage (Vgs)	±16	V
Input Capacitance (Ciss) @ 25V	3617	pF
Power Dissipation (Max)	143	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252-3 (DPAK)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the AUIRLS3114Z is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
Continuous Drain Current (Id): Must equal or exceed 56A at 25°C
On-State Resistance (Rds On): Must not exceed 4.9mOhm at rated current and 10V gate drive
Gate-Source Threshold Voltage (Vgs(th)): Must be within acceptable switching range
Operating Temperature Range: Must support -55°C to 175°C
FET Type: N-Channel MOSFET technology only
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values indicate faster switching
Input Capacitance (Ciss): Affects gate drive requirements
Maximum Gate-Source Voltage (Vgs): Must accommodate driver circuit voltage levels
Power Dissipation: Higher ratings provide thermal margin

Package Considerations: The AUIRLS3114Z uses TO-252AA (DPAK) packaging. Substitute parts may use alternative surface mount packages (TO-263, D2PAK) provided the electrical specifications are met and PCB layout can accommodate the different footprint.

Substitute parts are grouped into two categories:

Category 1 – Direct Electrical Equivalents (Infineon OptiMOS™ Series): IPB80N04S404ATMA1 and IPB80N04S4L04ATMA1 exceed the AUIRLS3114Z specifications with 80A continuous drain current, lower on-state resistance (4.0–4.2mOhm), and active product status. These parts are manufactured by Infineon Technologies using modern OptiMOS™ technology.

Category 2 – Performance-Enhanced Substitutes (NXP/Nexperia/STMicroelectronics): BUK964R4-40B,118, BUK765R2-40B,118, STB120N4LF6, and STB100NF04T4 provide equal or superior electrical performance with higher current ratings (75–120A), improved on-state resistance, and automotive-grade qualifications (AEC-Q101). These parts use alternative package formats (D2PAK/TO-263) and represent active product lines with enhanced thermal performance.

All substitute parts maintain the 40V Vdss rating, support the full -55°C to 175°C operating temperature range, and comply with RoHS3 and REACH regulations.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Package	Status
AUIRLS3114Z	Infineon	40	56	4.9	2.5	53	TO-252 (DPAK)	Obsolete
IPB80N04S404ATMA1	Infineon	40	80	4.2	4.0	43	TO-263 (D2PAK)	Active
IPB80N04S4L04ATMA1	Infineon	40	80	4.0	2.2	60	TO-263 (D2PAK)	Active
BUK964R4-40B,118	Nexperia	40	75	4.0	2.0	64	D2PAK	Active
BUK765R2-40B,118	NXP USA Inc.	40	75	5.2	4.0	52	D2PAK	Active
STB120N4LF6	STMicroelectronics	40	80	4.0	3.0	80	TO-263 (D2PAK)	Active
STB100NF04T4	STMicroelectronics	40	120	4.6	4.0	150	D2PAK	Active

Engineering Selection Recommendations

For Direct Replacement with Minimal Design Changes:

IPB80N04S404ATMA1 and IPB80N04S4L04ATMA1 are recommended as primary substitutes. Both are manufactured by Infineon Technologies and maintain the same technology platform as the AUIRLS3114Z. These parts exceed the original specifications with 80A continuous drain current and lower on-state resistance. Both parts are in active production status with unlimited moisture sensitivity level (MSL 1) and full RoHS3 compliance. The primary design consideration is the package transition from TO-252 (DPAK) to TO-263 (D2PAK), which requires PCB layout modification.

For Applications Requiring Automotive Qualification:

BUK964R4-40B,118, BUK765R2-40B,118, STB120N4LF6, and STB100NF04T4 are all qualified to AEC-Q101 automotive standards and carry active product status. These parts are suitable for automotive and industrial applications requiring formal qualification documentation. STB100NF04T4 provides the highest current rating (120A) and power dissipation (300W), making it suitable for high-power applications where thermal margin is critical.

For Cost-Optimized Solutions:

BUK765R2-40B,118 offers a balance of performance and availability with 75A continuous drain current and active production status. This part is available in bulk packaging and maintains compatibility with D2PAK footprints.

Compliance and Regulatory Considerations:

All substitute parts listed are RoHS3 compliant and REACH unaffected. All parts support the full -55°C to 175°C operating temperature range required by the original specification. Moisture sensitivity level is MSL 1 (unlimited) for all active substitutes, matching the original part's handling requirements.

Frequently Asked Questions (FAQ)

Q1: Can I use IPB80N04S404ATMA1 as a direct drop-in replacement for AUIRLS3114Z?

A: Electrically, yes. The IPB80N04S404ATMA1 exceeds all electrical specifications of the AUIRLS3114Z with 80A continuous drain current versus 56A, and lower on-state resistance (4.2mOhm versus 4.9mOhm). However, the package differs: AUIRLS3114Z uses TO-252 (DPAK) while IPB80N04S404ATMA1 uses TO-263 (D2PAK). PCB layout modification is required. Both parts operate across -55°C to 175°C and are RoHS3 compliant.

Q2: What is the difference between IPB80N04S404ATMA1 and IPB80N04S4L04ATMA1?

A: Both parts are 40V, 80A N-Channel MOSFETs from Infineon's OptiMOS™ series. IPB80N04S4L04ATMA1 has lower gate-source threshold voltage (2.2V versus 4.0V), which may provide faster switching response in certain gate drive circuits. IPB80N04S4L04ATMA1 has higher gate charge (60nC versus 43nC) and input capacitance (4690pF versus 3440pF). Selection depends on gate drive circuit design and switching speed requirements.

Q3: Why do some substitute parts have higher current ratings than the original AUIRLS3114Z?

A: Substitute parts such as STB100NF04T4 (120A) and BUK964R4-40B,118 (75A) represent modern manufacturing technology with improved thermal performance and lower on-state resistance. Higher current ratings provide design margin and allow for reduced thermal management requirements. These parts are suitable for applications where the original 56A rating was marginal.

Q4: Are all substitute parts automotive qualified?

A: No. IPB80N04S404ATMA1 and IPB80N04S4L04ATMA1 are industrial-grade parts without automotive qualification. BUK964R4-40B,118, BUK765R2-40B,118, STB120N4LF6, and STB100NF04T4 are all AEC-Q101 qualified for automotive applications. Select automotive-qualified parts only if your application requires formal automotive qualification documentation.

Q5: What package considerations apply when substituting AUIRLS3114Z?

A: The AUIRLS3114Z uses TO-252-3 (DPAK) with 2 leads plus tab. All substitute parts use either TO-263 (D2PAK) or D2PAK packages, which have different footprints and pin spacing. PCB layout modification is mandatory. Verify that your PCB design can accommodate the larger D2PAK footprint. Thermal performance may improve due to the larger package size and better heat dissipation characteristics of D2PAK versus DPAK.

Q6: Can I use STB100NF04T4 in place of AUIRLS3114Z in a space-constrained application?

A: STB100NF04T4 has superior electrical performance (120A, 4.6mOhm Rds On, 300W power dissipation) but uses a D2PAK package that is physically larger than the original TO-252 (DPAK). If PCB space is limited, IPB80N04S404ATMA1 or IPB80N04S4L04ATMA1 are better choices as they provide adequate performance improvement while using the same D2PAK footprint as other substitutes.

Q7: What is the moisture sensitivity level (MSL) for all substitute parts?

A: All substitute parts listed have MSL 1 (unlimited), matching the original AUIRLS3114Z. This means no special moisture control measures are required during storage, handling, or assembly.

Q8: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original AUIRLS3114Z.

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