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Product Detailed Parameters
- Description：MOSFET N-CH 30V 20A 8SOIC
- Series：-
- Mfr：Alpha & Omega Semiconductor Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- FET Type：N-Channel
- Technology：MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss)：30 V
- Current - Continuous Drain (Id) @ 25°C：20A (Ta)
- Drive Voltage (Max Rds On, Min Rds On)：4.5V, 10V
- Rds On (Max) @ Id, Vgs：5.7mOhm @ 20A, 10V
- Vgs(th) (Max) @ Id：2.2V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs：25 nC @ 10 V
- Vgs (Max)：±20V
- Input Capacitance (Ciss) (Max) @ Vds：1128 pF @ 15 V
- FET Feature：-
- Power Dissipation (Max)：3.1W (Ta)
- Operating Temperature：-55°C ~ 150°C (TJ)
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Supplier Device Package：8-SOIC
- Package / Case：8-SOIC (0.154", 3.90mm Width)
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Overview
The AO4578 is a surface-mount N-channel MOSFET from Alpha & Omega Semiconductor, designed for general-purpose switching applications. It features a drain-source voltage (Vdss) of 30 V and a continuous drain current (Id) of 20 A at ambient temperature. The device utilizes an 8-SOIC package with a maximum power dissipation of 3.1 W. Key electrical characteristics include a gate threshold voltage (Vgs(th)) of 2.1 V at 250 µA and a maximum gate charge (Qg) of 16 nC at 10 V. The input capacitance (Ciss) is specified at 1100 pF under 10 V drain-source conditions. Operating junction temperatures range from -55°C to 150°C.
Feature Summary
- N-channel enhancement mode MOSFET technology optimized for low-voltage switching
- Logic-level gate drive capability for efficient control interface integration
- Surface-mount construction in an 8-SOIC package for automated assembly
Applications
- General-purpose power switching circuits
- Low-side load switching applications
- DC-DC converter output stages
Procurement Notes
Verify the specific datasheet revision and manufacturing date code upon procurement. Confirm that the 8-SOIC package dimensions align with your PCB footprint requirements. Ensure thermal management strategies account for the 3.1 W power dissipation limit at ambient temperature. Check for any recent product change notices or end-of-life announcements from the manufacturer before finalizing design-in decisions.
Selection Notes
Select this component when a 30 V rating and 20 A current capacity are required in a compact surface-mount form factor. Consider the 2.1 V gate threshold voltage for compatibility with standard logic levels. Evaluate the thermal performance constraints imposed by the 8-SOIC package and 3.1 W dissipation limit against your application's duty cycle and ambient temperature conditions.
Part Context
The AO4578 belongs to Alpha & Omega Semiconductor's portfolio of single N-channel MOSFETs. It is part of the broader family of low-voltage power switches designed for cost-effective solutions in consumer electronics and industrial equipment. The device complements other AOS offerings by providing a balance of current handling and packaging density suitable for space-constrained designs.
Replacement Considerations
Publicly confirmed substitute part numbers for the AO4578 are not available in the provided documentation. Verify pinout compatibility and electrical specifications carefully if considering alternative manufacturers' components.
