AUIRFS3306 N-Channel MOSFET 60V 120A Equivalent & Substitute Parts

Part Overview

The AUIRFS3306 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 60V drain-to-source voltage with 120A continuous drain current at 25°C. This device is housed in a D2PAK (TO-263-3) surface mount package and delivers 230W maximum power dissipation. The part operates across a temperature range of -55°C to 175°C and is compliant with RoHS3 and REACH regulations.

The AUIRFS3306 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Suitable alternatives must maintain compatibility with the D2PAK package footprint and deliver equivalent electrical performance within the specified voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	120	A (Tc)
On-State Resistance (Rds On) @ 75A, 10V	4.2	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 150µA	4	V
Gate Charge (Qg) @ 10V	125	nC
Input Capacitance (Ciss) @ 50V	4520	pF
Power Dissipation (Max)	230	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AUIRFS3306 is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must support a minimum Vdss of 60V. Parts rated at 55V are acceptable only when system design margins permit operation below the original specification.

Current Handling Capacity: Substitute parts must deliver continuous drain current (Id) at or above 120A at 25°C to maintain equivalent current-carrying capability. Parts with lower current ratings (75A, 80A, 100A) represent reduced-capacity alternatives suitable only for applications with lower current demands.

On-State Resistance (Rds On): The AUIRFS3306 specifies 4.2 mOhm at 75A and 10V gate drive. Substitute parts with comparable or lower Rds On values ensure equivalent or improved power efficiency and thermal performance.

Package Compatibility: All substitutes must use D2PAK (TO-263-3) or compatible surface mount packages to maintain PCB layout compatibility.

Temperature Range: Operating temperature range of -55°C to 175°C must be maintained across all substitutes.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are mandatory for all substitutes.

Substitute parts are grouped into three categories based on current-handling capability relative to the AUIRFS3306:

Category A - Full Capacity Equivalents (120A and above): IXFA220N06T3 (220A), IXTA230N075T2-7 (230A). These parts exceed the original current rating and provide direct functional replacement with enhanced performance headroom.

Category B - Near-Equivalent Capacity (100A to 120A): STB100N6F7 (100A). These parts deliver current ratings within 83% of the original specification and are suitable for applications with moderate current demands.

Category C - Reduced Capacity Alternatives (75A to 80A): BUK764R0-55B,118 (75A, 55V), FDB050AN06A0 (80A, 60V), IXTA140N055T2 (140A, 55V), PSMN004-60B,118 (75A, 60V), STB130N6F7 (80A, 60V). These parts operate at reduced current ratings and lower voltage ratings in some cases, suitable for applications with lower power requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd Max (W)	Package	Status
AUIRFS3306	Infineon	60	120 (Tc)	4.2 @ 75A	125 @ 10V	4520 @ 50V	230 (Tc)	D2PAK	Obsolete
IXFA220N06T3	IXYS	60	220 (Tc)	4 @ 100A	136 @ 10V	8500 @ 25V	440 (Tc)	TO-263	Last Time Buy
IXTA230N075T2-7	IXYS	75	230 (Tc)	4.2 @ 50A	178 @ 10V	10500 @ 25V	480 (Tc)	TO-263-7	Active
IXTA140N055T2	IXYS	55	140 (Tc)	5.4 @ 50A	82 @ 10V	4760 @ 25V	250 (Ta)	TO-263	Active
BUK764R0-55B,118	Nexperia	55	75 (Tc)	4 @ 25A	86 @ 10V	6776 @ 25V	300 (Tc)	D2PAK	Active
FDB050AN06A0	onsemi	60	80 (Tc)	5 @ 80A	80 @ 10V	3900 @ 25V	245 (Tc)	TO-263	Active
PSMN004-60B,118	Nexperia	60	75 (Tc)	3.6 @ 25A	168 @ 10V	8300 @ 25V	230 (Tc)	D2PAK	Active
STB100N6F7	STMicroelectronics	60	100 (Tc)	5.6 @ 50A	30 @ 10V	1980 @ 25V	125 (Tc)	TO-263	Active
STB130N6F7	STMicroelectronics	60	80 (Tc)	5 @ 40A	42 @ 10V	2600 @ 25V	160 (Tc)	TO-263	Active

Engineering Selection Recommendations

For Direct Replacement with Enhanced Performance:

IXFA220N06T3 and IXTA230N075T2-7 deliver current ratings exceeding 200A and maintain 60V or higher voltage ratings. Both parts are RoHS3 compliant and REACH unaffected. IXFA220N06T3 is classified as Last Time Buy, indicating limited future availability. IXTA230N075T2-7 maintains Active product status with ongoing manufacturer support. These parts are suitable for applications requiring full or enhanced current capacity with no design modifications.

For Near-Equivalent Replacement:

STB100N6F7 delivers 100A continuous drain current at 60V with D2PAK package compatibility. This part is Active and RoHS3 compliant. It is suitable for applications where current demand does not exceed 100A and where the reduced power dissipation rating (125W) is acceptable.

For Reduced-Capacity Applications:

BUK764R0-55B,118, FDB050AN06A0, PSMN004-60B,118, and STB130N6F7 are suitable for applications with current demands of 75A to 80A. All parts are Active, RoHS3 compliant, and REACH unaffected. BUK764R0-55B,118 and IXTA140N055T2 operate at 55V, requiring verification that system design margins accommodate the reduced voltage rating. PSMN004-60B,118 maintains 60V rating with D2PAK package compatibility and equivalent power dissipation to the original part.

Compliance and Availability:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Inventory availability ranges from 946 to 21,300 units across active parts, supporting both prototype and production requirements.

Frequently Asked Questions (FAQ)

Q: Can IXTA230N075T2-7 replace AUIRFS3306 directly on the PCB?

A: IXTA230N075T2-7 uses TO-263-7 package with six leads plus tab, while AUIRFS3306 uses D2PAK (TO-263-3) with two leads plus tab. Package footprints are not compatible. PCB layout modification is required.

Q: What is the difference between Tc and Ta current ratings?

A: Tc (case temperature) ratings assume thermal management at the device case. Ta (ambient temperature) ratings assume operation in free air. Tc ratings are typically higher and represent the device's maximum capability with proper heat sinking.

Q: Is BUK764R0-55B,118 suitable for 60V applications?

A: BUK764R0-55B,118 is rated for 55V maximum drain-to-source voltage. It is not suitable for applications requiring 60V operation. Use only in systems where operating voltage does not exceed 55V.

Q: Which substitute offers the lowest on-state resistance?

A: PSMN004-60B,118 delivers 3.6 mOhm at 25A and 10V gate drive, the lowest Rds On value among substitutes. However, this measurement is taken at lower current (25A) compared to the AUIRFS3306 specification (75A), limiting direct comparison.

Q: Are all substitutes available in tape and reel packaging?

A: Packaging varies across substitutes. BUK764R0-55B,118 and PSMN004-60B,118 are supplied in Tape & Reel. STB100N6F7 and STB130N6F7 are available in Cut Tape & Digi-Reel. IXYS parts are supplied in Tube. Confirm packaging requirements with supplier before procurement.

Q: What is the gate charge difference between AUIRFS3306 and substitutes?

A: AUIRFS3306 specifies 125 nC gate charge at 10V. Substitutes range from 30 nC (STB100N6F7) to 178 nC (IXTA230N075T2-7). Lower gate charge reduces driver power requirements and switching losses. Higher gate charge may require driver circuit adjustment.

Q: Can I use STB100N6F7 in a 120A application?

A: STB100N6F7 is rated for 100A continuous drain current. Using it in a 120A application exceeds the device rating and risks thermal runaway and failure. Select a substitute rated for 120A or higher, or reduce application current demand to 100A or below.

Q: Which substitute has the smallest input capacitance?

A: STB100N6F7 has the lowest input capacitance at 1980 pF at 25V, reducing gate drive power and improving switching speed. IXTA230N075T2-7 has the highest at 10,500 pF, requiring higher gate drive current.

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