AUIRFS3307Z N-Channel 75V 120A MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRFS3307Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 75V drain-to-source voltage and 120A continuous drain current in a D2PAK (TO-263-3) surface mount package. This device is part of the HEXFET® series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute devices must maintain compatibility across electrical ratings, thermal performance, and mechanical packaging to ensure direct replacement capability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	75	V
Continuous Drain Current (Id) @ 25°C	120	A (Tc)
On-State Resistance (Rds On) @ 75A, 10V	5.8	mOhm
Gate Threshold Voltage (Vgs(th)) @ 150µA	4	V
Gate Charge (Qg) @ 10V	110	nC
Power Dissipation (Max)	230	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-263-3, D2PAK	Surface Mount
FET Technology	N-Channel MOSFET	Metal Oxide

Substitute Part Grouping Explanation

Substitution eligibility for the AUIRFS3307Z is determined by the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 75V minimum
Continuous Drain Current (Id): 120A or greater at 25°C
Package Type: TO-263-3 / D2PAK surface mount
Operating Temperature Range: -55°C to 175°C minimum
On-State Resistance (Rds On): Performance within acceptable thermal limits
RoHS3 Compliance and REACH Unaffected status

Grouping Logic:

Group 1 – Direct Equivalents (75V, 100A+): Parts meeting or exceeding 120A rating at 75V with comparable Rds On characteristics and identical package type. These devices provide direct functional replacement with equivalent or superior electrical performance.

Group 2 – Functional Substitutes (75V, 80-100A): Parts rated at 75V with continuous drain current between 80A and 100A. These devices operate within the same voltage class and package but with reduced current capacity. Substitution is valid for applications where the full 120A rating is not required.

Group 3 – Alternative Voltage Class (55V, 110A+): Parts with lower voltage ratings (55V) but higher current capacity. These are suitable only for applications where the lower voltage rating is acceptable and current demand is high.

Group 4 – Reduced Performance Alternatives (68V, 80A): Parts with voltage ratings below 75V and current ratings below 120A. These represent the minimum acceptable performance tier for specific application constraints.

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and surface mount D2PAK or equivalent packaging.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Package	Product Status
AUIRFS3307Z	Infineon	75	120	5.8 @ 75A, 10V	110 @ 10V	230	D2PAK	Obsolete
IPB100N08S207ATMA1	Infineon	75	100	6.8 @ 80A, 10V	200 @ 10V	300	D2PAK	Last Time Buy
IPB100N08S2L07ATMA1	Infineon	75	100	6.5 @ 80A, 10V	246 @ 10V	300	D2PAK	Obsolete
IPB80N08S207ATMA1	Infineon	75	80	7.1 @ 80A, 10V	180 @ 10V	300	D2PAK	Active
IPB80N08S2L07ATMA1	Infineon	75	80	6.8 @ 80A, 10V	233 @ 10V	300	D2PAK	Last Time Buy
BUK9606-75B,118	Nexperia	75	75	5.5 @ 25A, 10V	95 @ 5V	300	D2PAK	Active
FDB060AN08A0	onsemi	75	80	6 @ 80A, 10V	95 @ 10V	255	D2PAK	Active
IXTA110N055T2	IXYS	55	110	6.6 @ 25A, 10V	57 @ 10V	180	D2PAK	Active
IXTA170N075T2	IXYS	75	170	5.4 @ 50A, 10V	109 @ 10V	360	D2PAK	Active
STB140NF75T4	STMicroelectronics	75	120	7.5 @ 70A, 10V	218 @ 10V	310	D2PAK	Active
STH110N7F6-2	STMicroelectronics	68	80	6.3 @ 55A, 10V	100 @ 10V	176	H2PAK-2	Active

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Preferred):

STB140NF75T4 (STMicroelectronics) is the primary recommended substitute. This device matches the AUIRFS3307Z specification exactly: 75V rating, 120A continuous drain current, and D2PAK package. The STB140NF75T4 is in active product status, ensuring long-term availability and supply chain stability. Power dissipation (310W) exceeds the original specification (230W), providing thermal margin. RoHS3 compliance and REACH unaffected status are confirmed.

IXTA170N075T2 (IXYS) provides superior electrical performance with 170A continuous drain current at 75V, lower on-state resistance (5.4 mOhm), and higher power dissipation (360W). This device is in active status and suitable for applications requiring enhanced current handling or thermal performance. The D2PAK package ensures mechanical compatibility.

Tier 2 – Functional Substitutes (Current-Limited Applications):

IPB80N08S207ATMA1 (Infineon) is an active product rated at 75V and 80A continuous drain current. This device is suitable for applications where the full 120A rating is not required. The OptiMOS™ series technology provides optimized on-state resistance (7.1 mOhm) and power dissipation (300W). D2PAK packaging ensures direct mechanical replacement.

FDB060AN08A0 (onsemi) operates at 75V with 80A continuous drain current in a D2PAK package. The PowerTrench® technology delivers 6 mOhm on-state resistance and 255W power dissipation. Active product status ensures availability.

Tier 3 – Reduced Voltage Applications:

IXTA110N055T2 (IXYS) is limited to 55V drain-to-source voltage but provides 110A continuous drain current. This device is suitable only for applications where the lower voltage rating is acceptable. The TrenchT2™ technology offers low on-state resistance (6.6 mOhm) and reduced gate charge (57 nC).

Tier 4 – Minimum Performance Alternative:

STH110N7F6-2 (STMicroelectronics) operates at 68V with 80A continuous drain current. The H2PAK-2 package differs from the D2PAK, requiring board layout modification. This device is suitable only when voltage and current constraints permit and package adaptation is feasible.

Compliance Summary:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Devices in active product status (STB140NF75T4, IPB80N08S207ATMA1, FDB060AN08A0, IXTA170N075T2, IXTA110N055T2, STH110N7F6-2) provide long-term supply assurance. Last Time Buy status devices (IPB100N08S207ATMA1, IPB100N08S2L07ATMA1, IPB80N08S2L07ATMA1) are available but with limited production windows.

Frequently Asked Questions (FAQ)

Q: Can the STB140NF75T4 directly replace the AUIRFS3307Z without circuit modification?

A: Yes. The STB140NF75T4 matches the AUIRFS3307Z in voltage rating (75V), current rating (120A), and D2PAK package. Gate threshold voltage (4V @ 250µA), maximum gate voltage (±20V), and operating temperature range (-55°C to 175°C) are compatible. No circuit modification is required for direct substitution.

Q: What is the difference between the IPB100N08S207ATMA1 and IPB100N08S2L07ATMA1?

A: Both devices are rated at 75V and 100A continuous drain current in D2PAK packages. The IPB100N08S2L07ATMA1 features a lower gate threshold voltage (2V @ 250µA versus 4V @ 250µA) and supports dual drive voltage operation (4.5V and 10V). The IPB100N08S207ATMA1 operates at 10V drive voltage only. Selection depends on gate drive circuit capability and switching speed requirements.

Q: Is the IXTA170N075T2 suitable as a substitute if the application requires only 100A?

A: Yes. The IXTA170N075T2 is rated at 170A continuous drain current, which exceeds the 100A requirement. The device operates at 75V, matching the voltage specification. The lower on-state resistance (5.4 mOhm) and higher power dissipation (360W) provide performance margin. The D2PAK package ensures mechanical compatibility. This device is suitable for applications with current headroom requirements.

Q: Why is the IXTA110N055T2 listed as a substitute if it has a lower voltage rating?

A: The IXTA110N055T2 is included as a substitute option for applications where the 75V rating is not required and the lower 55V rating is acceptable. The device provides 110A continuous drain current, which approaches the original 120A specification. This device is suitable only for circuits designed for 55V maximum drain-to-source voltage.

Q: What is the impact of using the IPB80N08S207ATMA1 in an application designed for 120A?

A: The IPB80N08S207ATMA1 is rated at 80A continuous drain current, which is 33% below the original 120A specification. This device is suitable only for applications where the actual current demand does not exceed 80A. Using this device in a 120A application will result in thermal stress and potential device failure. Current requirements must be verified before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected. Compliance certifications are confirmed for each device.

Q: What is the difference between D2PAK and H2PAK-2 packages?

A: D2PAK (TO-263-3) and H2PAK-2 are both surface mount packages with different thermal and mechanical characteristics. D2PAK is the standard package for the AUIRFS3307Z. H2PAK-2 (used by STH110N7F6-2) has different pin configuration and thermal pad dimensions, requiring board layout modification. Direct mechanical substitution is not possible without PCB redesign.

Q: Which substitute offers the best thermal performance?

A: The IXTA170N075T2 provides the highest power dissipation rating (360W), followed by STB140NF75T4 (310W) and IPB100N08S207ATMA1 (300W). Selection of thermal performance depends on application heat dissipation requirements and thermal management design.

Q: Can the BUK9606-75B,118 be used in high-frequency switching applications?

A: The BUK9606-75B,118 has a gate charge of 95 nC @ 5V, which is lower than the AUIRFS3307Z (110 nC @ 10V). Lower gate charge enables faster switching transitions. However, the device is rated at 75A continuous drain current, which is below the original 120A specification. This device is suitable for high-frequency applications where current requirements do not exceed 75A.

Q: What is the significance of "Last Time Buy" product status?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for the product. Devices with this status have limited production windows and will eventually become unavailable. Inventory may be procured during the Last Time Buy period, but long-term supply is not assured. Active status devices are preferred for new designs and ongoing production.

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