AOI4T60 Equivalent & Substitute Parts

Part Overview

The AOI4T60 is an N-Channel MOSFET rated for 600V drain-to-source voltage with 4A continuous drain current in a Through Hole TO-251A package. This device is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -50°C to 150°C and dissipates up to 83W at the case temperature, suitable for high-voltage switching applications requiring robust thermal performance.

Substiute Parts

AOI4T60

Alpha & Omega Semiconductor Inc.In Stock: 4858AOI4T60 Datasheet

Current PartRFQ

STU3N62K3

STMicroelectronicsIn Stock: 17155STU3N62K3 Datasheet

MFR RecommendedRFQ

STU4N62K3

STMicroelectronicsIn Stock: 1505STU4N62K3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOI4T60 is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must maintain or exceed the 600V Vdss specification to ensure safe operation in the same circuit topology. The STU3N62K3 and STU4N62K3 both provide 620V Vdss, meeting this requirement with margin.

Current Capacity: The AOI4T60 delivers 4A continuous drain current. Substitute parts must support equivalent or higher current ratings to maintain circuit performance. The STU3N62K3 provides 2.7A and the STU4N62K3 provides 3.8A, establishing two substitution tiers based on current requirements.

On-State Resistance (Rds On): The AOI4T60 specifies 2.1Ohm maximum at 1A, 10V gate drive. Substitute parts with comparable or lower Rds On values ensure equivalent or improved conduction losses and thermal performance.

Package Compatibility: Both substitute parts use Through Hole mounting in TO-251 (IPAK) package variants, maintaining mechanical and thermal interface compatibility with the original design.

Gate Drive Voltage: All parts operate with 10V drive voltage specification, ensuring gate driver circuit compatibility.

Temperature Range: The AOI4T60 operates to 150°C junction temperature. Both substitutes support this maximum temperature, maintaining thermal design margins.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (4A Continuous Current Requirement):

The STU4N62K3 provides the closest functional match to the AOI4T60. It delivers 3.8A continuous drain current, supporting applications requiring up to 3.8A at 25°C case temperature. The STU4N62K3 features 2Ohm maximum on-state resistance at 1.9A, 10V gate drive, which is superior to the AOI4T60 specification. Power dissipation is rated at 70W, compared to the original 83W, indicating improved thermal efficiency. The part is manufactured by STMicroelectronics under the SuperMESH3™ series and maintains Active product status with RoHS3 compliance.

For Current-Limited Applications (2.7A Continuous Current Requirement):

The STU3N62K3 is suitable for designs where continuous drain current does not exceed 2.7A at 25°C case temperature. This part provides 2.5Ohm maximum on-state resistance at 1.4A, 10V gate drive. Power dissipation is 45W, representing a significant reduction from the original specification. The STU3N62K3 is also manufactured by STMicroelectronics under the SuperMESH3™ series with Active product status and RoHS3 compliance.

Compliance and Regulatory Considerations:

Both substitute parts maintain REACH Unaffected status and EAR99 export classification, matching the regulatory profile of the AOI4T60. Moisture sensitivity level remains at MSL 1 (Unlimited) for both substitutes, eliminating moisture-related handling constraints. The STMicroelectronics parts carry RoHS3 compliance certification, providing enhanced environmental compliance compared to the obsolete original part.

Package and Thermal Interface:

Both substitutes use TO-251 (IPAK) Through Hole packages with short leads, compatible with existing PCB layouts designed for the AOI4T60 TO-251A stub lead variant. Thermal interface characteristics remain consistent with the original design, supporting equivalent heatsinking and thermal management strategies.

Frequently Asked Questions (FAQ)

Q: Can the STU3N62K3 replace the AOI4T60 in all applications?

A: The STU3N62K3 is suitable only for applications where continuous drain current does not exceed 2.7A at 25°C case temperature. If the design requires the full 4A capability of the AOI4T60, the STU4N62K3 is the appropriate substitute. Both parts maintain 600V+ voltage rating and compatible package form factors.

Q: What is the difference between the STU3N62K3 and STU4N62K3?

A: The primary differences are continuous drain current rating (2.7A versus 3.8A), on-state resistance (2.5Ohm versus 2Ohm), gate charge (13nC versus 22nC), and power dissipation (45W versus 70W). The STU4N62K3 provides higher current capacity and lower on-state resistance, making it the closer functional equivalent to the AOI4T60. Selection depends on the specific current requirements of the application.

Q: Are the package dimensions identical between the AOI4T60 and substitute parts?

A: Both substitute parts use TO-251 (IPAK) Through Hole packages. The AOI4T60 specifies TO-251-3 Stub Leads, while the substitutes specify TO-251-3 Short Leads. This distinction affects lead length but maintains mechanical compatibility with standard TO-251 footprints. Verification of lead length against PCB design is recommended for applications with tight lead-to-component spacing.

Q: Do the substitute parts require different gate drive circuitry?

A: No. All three parts operate with 10V drive voltage specification and ±30V maximum gate-source voltage. Gate driver circuits designed for the AOI4T60 are directly compatible with both STU3N62K3 and STU4N62K3 substitutes without modification.

Q: What are the thermal implications of switching to a substitute part?

A: The STU4N62K3 dissipates 70W maximum at case temperature, compared to 83W for the AOI4T60, representing a 15.7% reduction in thermal load. The STU3N62K3 dissipates 45W, a 45.8% reduction. Both substitutes support the same -50°C to 150°C operating temperature range. Thermal design margins may improve with either substitute, allowing for reduced heatsinking requirements or increased ambient temperature tolerance.

Q: Are there any differences in on-state resistance characteristics?

A: The STU4N62K3 specifies 2Ohm maximum on-state resistance at 1.9A, 10V gate drive, compared to 2.1Ohm for the AOI4T60 at 1A, 10V. The STU3N62K3 specifies 2.5Ohm at 1.4A, 10V. Lower on-state resistance reduces conduction losses and improves efficiency. Designs operating at the rated current of each part will experience improved performance with the STU4N62K3 substitute.

Q: What is the inventory status of substitute parts?

A: The STU3N62K3 has 17,100 pieces in stock, and the STU4N62K3 has 1,480 pieces in stock. Both parts are manufactured by STMicroelectronics with Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete AOI4T60.