AOD476 MOSFET N-Channel 20V 25A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD476 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 20V drain-to-source voltage with 25A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as Obsolete, making identification of functionally equivalent substitute parts essential for ongoing production and design continuity. The AOD476 serves applications requiring moderate voltage switching with compact form factor and thermal management capabilities suitable for power conversion and switching circuits.

Substiute Parts

AOD476

Alpha & Omega Semiconductor Inc.In Stock: 2514AOD476 Datasheet

Current PartRFQ

AOD480

Alpha & Omega Semiconductor Inc.In Stock: 19766AOD480 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOD476 is determined by strict electrical and mechanical compatibility within the N-Channel MOSFET category. The primary substitution candidate must satisfy the following criteria:

Mandatory Compatibility Parameters:

• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Mounting Type: Surface Mount
• Package Type: TO-252 (DPAK)
• Drain-to-Source Voltage (Vdss): Equal to or greater than 20V
• Continuous Drain Current (Id): Equal to or greater than 25A
• Operating Temperature Range: Must encompass -55°C to 175°C

Electrical Performance Considerations:

• On-state resistance (Rds On) must not exceed the maximum specified value to maintain thermal performance
• Gate charge characteristics must be compatible with existing drive circuitry
• Threshold voltage must fall within acceptable gate drive voltage ranges

The AOD480 qualifies as a direct substitute based on these parameters. It maintains identical current rating (25A), exceeds the voltage rating (30V vs. 20V), operates across the same temperature range, and utilizes the same TO-252 (DPAK) package configuration.

Parameter Comparison

Engineering Selection Recommendations

AOD476 Status: Obsolete. This part is no longer in active production and is not recommended for new designs. Existing inventory is available (2411 pcs), but long-term supply cannot be assured.

AOD480 Status: Not For New Designs. While this substitute maintains functional compatibility, it is also subject to design phase-out considerations. However, it provides superior voltage rating (30V vs. 20V) and lower gate charge (14 nC vs. 18 nC), offering improved performance margins in switching applications.

Compliance & Certifications:

• AOD476: REACH Unaffected, EAR99 classification
• AOD480: ROHS3 Compliant, REACH Unaffected, EAR99 classification

The AOD480 is the manufacturer-recommended substitute and provides enhanced electrical specifications while maintaining identical package and mounting characteristics. The higher voltage rating (30V) ensures compatibility with circuits originally designed for the 20V AOD476, as the device operates safely within lower voltage stress conditions. The reduced gate charge facilitates faster switching transitions with equivalent or reduced drive circuit complexity.

Frequently Asked Questions (FAQ)

Q: Can the AOD480 directly replace the AOD476 in existing circuit designs?

A: Yes. The AOD480 maintains identical current rating (25A), package type (TO-252 DPAK), and operating temperature range (-55°C to 175°C). The higher voltage rating (30V vs. 20V) provides additional design margin. Pin configuration and thermal characteristics are equivalent, enabling direct PCB-level substitution without circuit modification.

Q: What are the key electrical differences between AOD476 and AOD480?

A: The primary differences are drain-to-source voltage rating (20V vs. 30V), on-state resistance (21 mOhm vs. 23 mOhm), gate threshold voltage (2V vs. 2.5V), and gate charge (18 nC vs. 14 nC). The AOD480 exhibits lower gate charge, enabling faster switching response. The slightly higher on-state resistance is offset by the superior voltage rating and reduced power dissipation at case temperature (21W vs. 33.3W).

Q: Are there packaging or moisture sensitivity concerns with substitution?

A: No. Both devices utilize identical TO-252 (DPAK) surface mount packaging with Moisture Sensitivity Level 1 (Unlimited). No special handling or storage modifications are required when transitioning from AOD476 to AOD480.

Q: Why is the AOD480 classified as "Not For New Designs" if it is the recommended substitute?

A: The AOD480 classification reflects Alpha & Omega Semiconductor Inc.'s product lifecycle management. While suitable for sustaining production of existing designs using the obsolete AOD476, new circuit designs should evaluate current-generation alternatives from the manufacturer's active product portfolio. The AOD480 remains available for legacy system support and production continuity.

Q: What is the impact of the 2 mOhm increase in Rds On (AOD480 vs. AOD476)?

A: At the rated 20A drain current and 10V gate-source voltage, the 2 mOhm increase (21 mOhm to 23 mOhm) results in approximately 8.4 mW additional conduction loss per 20A of current. In most switching applications, this represents a negligible thermal impact, particularly given the AOD480's lower case temperature power dissipation rating (21W vs. 33.3W).

Q: Are REACH and RoHS compliance statuses compatible between these parts?

A: Yes. Both devices are REACH Unaffected. The AOD480 carries ROHS3 Compliant certification, which exceeds the compliance profile of the obsolete AOD476. This ensures regulatory compatibility for applications subject to RoHS directives.