AO4486 Equivalent & Substitute Parts

Part Overview

The AO4486 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 100V drain-to-source voltage with a continuous drain current of 4.2A at 25°C. The device is housed in an 8-SOIC surface mount package and is designed for general-purpose switching applications requiring moderate current handling and voltage blocking capability.

The AO4486 carries a product status of "Not For New Designs," indicating that Alpha & Omega Semiconductor Inc. has discontinued active development and support for this part number. This status necessitates identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for existing applications or new designs requiring similar performance characteristics.

Substiute Parts

AO4486

Alpha & Omega Semiconductor Inc.In Stock: 1962AO4486 Datasheet

Current PartRFQ

AO4286

Alpha & Omega Semiconductor Inc.In Stock: 230312AO4286 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AO4486 is determined by electrical and mechanical parameter alignment within the N-Channel MOSFET category. The primary substitution criteria are:

Electrical Compatibility Parameters:

• Drain-to-source voltage rating (Vdss) must equal or exceed 100V
• Continuous drain current (Id) must support the application's current requirements
• On-state resistance (Rds On) must be compatible with thermal and efficiency constraints
• Gate threshold voltage (Vgs(th)) must fall within acceptable control voltage ranges
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Parameters:

• Package type must be 8-SOIC to ensure PCB footprint compatibility
• Surface mount mounting type must be maintained
• Lead pitch and package dimensions must conform to 8-SOIC (0.154", 3.90mm Width) specification

The AO4286 qualifies as a direct substitute based on matching Vdss (100V), identical package configuration (8-SOIC), surface mount compatibility, and overlapping operating temperature range. While the AO4286 exhibits a lower continuous drain current rating (4A versus 4.2A) and reduced on-state resistance (68mOhm versus 79mOhm), these parameters remain within acceptable substitution boundaries for applications designed around the AO4486's electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: AO4286

The AO4286 is the manufacturer-recommended substitute for the AO4486. Selection of the AO4286 is supported by the following engineering criteria:

Compliance and Regulatory Status: The AO4286 maintains full ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the AO4486. Both devices carry MSL Level 1 (Unlimited) moisture sensitivity classification, ensuring equivalent handling and storage requirements.

Product Status Advantage: The AO4286 carries an "Active" product status, indicating ongoing manufacturer support, continued availability, and sustained quality assurance. This status directly addresses the obsolescence concern presented by the AO4486's "Not For New Designs" designation.

Electrical Parameter Alignment: Both devices share identical Vdss ratings (100V) and operating temperature ranges (-55°C to 150°C), ensuring thermal and voltage stress compatibility. The AO4286's lower on-state resistance (68mOhm at 4A versus 79mOhm at 3A) and reduced gate charge (10nC versus 20nC) provide improved switching efficiency and reduced gate drive power requirements. The AO4286's lower input capacitance (390pF versus 942pF) results in faster switching transitions and reduced electromagnetic interference.

Mechanical Compatibility: Both devices utilize identical 8-SOIC surface mount packaging with matching footprint dimensions (0.154", 3.90mm Width), enabling direct PCB layout compatibility without redesign.

Current Rating Consideration: Applications operating at continuous drain currents below 4.0A at 25°C can directly substitute the AO4286 for the AO4486 without derating. Applications requiring the full 4.2A rating of the AO4486 must evaluate thermal management and duty cycle characteristics to confirm AO4286 suitability.

Frequently Asked Questions (FAQ)

Q: Can the AO4286 directly replace the AO4486 in existing designs?

A: The AO4286 provides direct mechanical and electrical compatibility for applications operating within its 4.0A continuous drain current rating. PCB footprint compatibility is maintained due to identical 8-SOIC packaging. Applications requiring the full 4.2A rating of the AO4486 must evaluate thermal conditions and duty cycle to confirm adequate performance margin.

Q: What are the key electrical differences between the AO4486 and AO4286?

A: The AO4286 exhibits lower on-state resistance (68mOhm versus 79mOhm), reduced gate charge (10nC versus 20nC), and significantly lower input capacitance (390pF versus 942pF). These differences result in improved switching efficiency and reduced gate drive power. The AO4286 is rated for 4.0A continuous drain current compared to the AO4486's 4.2A rating.

Q: Are there any package or footprint differences between these devices?

A: Both the AO4486 and AO4286 utilize identical 8-SOIC surface mount packaging with matching dimensions (0.154", 3.90mm Width). No PCB layout modifications are required for substitution.

Q: What is the significance of the AO4486's "Not For New Designs" status?

A: This status indicates that Alpha & Omega Semiconductor Inc. has discontinued active development and support for the AO4486. The manufacturer recommends the AO4286 as the active alternative for new designs and ongoing production. Existing inventory of the AO4486 remains available, but long-term supply continuity is not guaranteed.

Q: Do both devices meet the same regulatory and compliance standards?

A: Yes. Both the AO4486 and AO4286 are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity classification. Regulatory and environmental compliance requirements are equivalent between the two devices.

Q: How do the gate charge and input capacitance differences affect circuit design?

A: The AO4286's lower gate charge (10nC versus 20nC) reduces the charge that must be supplied by the gate driver, resulting in lower gate drive power dissipation and faster switching transitions. The reduced input capacitance (390pF versus 942pF) decreases the capacitive load on the gate driver and enables higher switching frequencies with equivalent drive circuit complexity.

Q: Are there thermal management considerations when substituting the AO4286 for the AO4486?

A: The AO4286 exhibits lower maximum power dissipation (2.5W versus 3.1W) and lower on-state resistance, resulting in reduced heat generation under equivalent operating conditions. Applications operating at continuous drain currents below 4.0A benefit from improved thermal characteristics. Applications requiring sustained operation at 4.2A must evaluate thermal margins to confirm adequate heat dissipation with the AO4286's lower power rating.