AOU4S60 N-Channel 600V 4A MOSFET Equivalent & Substitute Parts

Part Overview

The AOU4S60 is an N-Channel 600V 4A MOSFET manufactured by Alpha & Omega Semiconductor Inc. in the TO-251-3 package. This device is part of the aMOS™ series and is classified as obsolete. The part operates at a maximum drain-source voltage of 600V with a continuous drain current of 4A at 25°C and a maximum power dissipation of 56.8W. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	600	V
Continuous Drain Current (Id) @ 25°C	4	A
Rds On (Max) @ Id, Vgs	900 mOhm @ 2A, 10V	—
Gate Threshold Voltage (Vgs(th)) @ Id	4.1	V @ 250µA
Power Dissipation (Max)	56.8	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package	TO-251-3	—

Substitute Part Grouping Explanation

Substitution of the AOU4S60 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 600V minimum
Continuous Drain Current (Id): 4A or greater
On-State Resistance (Rds On): 900 mOhm or lower at specified gate voltage
Package Type: TO-251-3 (IPAK) through-hole configuration
Gate Threshold Voltage (Vgs(th)): Compatible with 10V drive voltage
Operating Temperature: -55°C to 150°C or equivalent range

Substitution Logic: Parts meeting or exceeding the AOU4S60 electrical specifications while maintaining the same package footprint and through-hole mounting are classified as direct substitutes. Parts with higher voltage ratings (620V, 700V) or higher current ratings (4.5A, 5A, 5.5A, 6A) are acceptable substitutes provided they maintain electrical compatibility and the same package designation. Parts with lower current ratings or higher on-state resistance are not suitable substitutes.

Parameter Comparison

Parameter	AOU4S60	STU6N60M2	STU7N60M2	STU7NM60N	STU6N62K3	IPSA70R900P7SAKMA1	TSM60NB900CH C5G
Manufacturer	Alpha & Omega	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	Infineon	Taiwan Semiconductor
Vdss (V)	600	600	600	600	620	700	600
Id @ 25°C (A)	4	4.5	5	5	5.5	6	4
Rds On (Max) @ 10V (mOhm)	900 @ 2A	1200 @ 2.25A	950 @ 2.5A	900 @ 2.5A	1200 @ 2.8A	900 @ 1.1A	900 @ 1.2A
Vgs(th) (V)	4.1 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA	4.5 @ 50µA	3.5 @ 60µA	4 @ 250µA
Power Dissipation (W)	56.8	60	60	45	90	30.5	36.8
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 150	—	—	-40 to 150	-55 to 150
Package	TO-251-3	TO-251 (IPAK)	TO-251 (IPAK)	TO-251 (IPAK)	TO-251 (IPAK)	PG-TO251-3	TO-251 (IPAK)
Product Status	Obsolete	Active	Active	Active	Active	Last Time Buy	Obsolete
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): STU7NM60N from STMicroelectronics is the primary recommended substitute. This part maintains 600V Vdss and 5A continuous drain current, exceeding the AOU4S60 current specification. The on-state resistance of 900 mOhm at 2.5A matches the original specification. The part is in active production status with high inventory availability (88,400 units), ensuring long-term supply continuity. Full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) are maintained.

Secondary Substitute (Equivalent Performance): STU6N60M2 from STMicroelectronics provides equivalent electrical performance with 600V Vdss and 4.5A continuous drain current. This part is in active production status with 1,500 units in stock. The slightly higher on-state resistance (1.2 Ohm) and higher power dissipation (60W) are acceptable for applications where the original 56.8W specification allows margin.

Alternative Substitute (Higher Voltage Rating): IPSA70R900P7SAKMA1 from Infineon Technologies offers 700V Vdss with 6A continuous drain current and 900 mOhm on-state resistance. This part is classified as Last Time Buy and provides enhanced voltage margin for applications requiring higher transient voltage protection. The lower power dissipation (30.5W) indicates improved efficiency characteristics.

Compatibility Substitute (Exact Current Match): TSM60NB900CH C5G from Taiwan Semiconductor Corporation matches the AOU4S60 specification exactly at 600V and 4A. This part is obsolete and should be used only for legacy system maintenance where exact parameter matching is required. New designs should not utilize this part.

Not Recommended: STU6N62K3 exhibits significantly higher gate charge (30 nC) and input capacitance (875 pF), which may impact switching performance in applications sensitive to gate drive requirements. STU9N60M2 is not included in the primary substitute list due to higher on-state resistance variation and limited inventory.

Frequently Asked Questions (FAQ)

Q: Can STU7NM60N directly replace AOU4S60 in existing PCB layouts? A: Yes. Both parts use the TO-251-3 package with identical pin configuration and footprint. No PCB modifications are required. The through-hole mounting and lead spacing are compatible.

Q: What is the difference between STU7NM60N and STU7N60M2? A: Both parts share the same 600V Vdss and 5A Id specifications. STU7NM60N (MDmesh™ II series) has lower power dissipation (45W) and higher gate charge (14 nC). STU7N60M2 (MDmesh™ II Plus series) has higher power dissipation (60W) and lower gate charge (8.8 nC). Selection depends on thermal and switching speed requirements.

Q: Is the IPSA70R900P7SAKMA1 suitable for applications designed for 600V operation? A: Yes. The 700V Vdss rating provides additional voltage margin and is fully compatible with 600V circuit designs. The 6A continuous drain current exceeds the original 4A specification. No circuit modifications are required.

Q: Why is the AOU4S60 classified as obsolete? A: The part is no longer in active production from Alpha & Omega Semiconductor Inc. Existing inventory is limited to 3,840 units. Substitution with active production parts from STMicroelectronics or Infineon is necessary for long-term supply assurance.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts listed carry RoHS3 compliance certification, matching the original AOU4S60 environmental compliance status.

Q: What is the significance of the TO-251-3 package designation? A: TO-251-3 is the industry standard designation for three-terminal through-hole MOSFET packages (also called IPAK or IPak). All substitute parts use this same package, ensuring mechanical and electrical compatibility without PCB redesign.

Q: Can I use STU6N62K3 as a substitute despite higher specifications? A: STU6N62K3 is electrically compatible but exhibits higher gate charge (30 nC versus 6 nC) and significantly higher input capacitance (875 pF versus 263 pF). This may require gate driver circuit adjustments. Use only if thermal performance improvement (90W dissipation) justifies gate drive circuit modifications.

Q: What inventory considerations should guide substitute selection? A: STU7NM60N offers the highest inventory availability (88,400 units), providing maximum supply security. STU6N60M2 (1,500 units) and STU7N60M2 (3,170 units) provide adequate stock for medium-term requirements. IPSA70R900P7SAKMA1 (1,112 units) is classified as Last Time Buy, indicating limited future availability.

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