AO4842

Overview

The AO4842 is a dual N-channel MOSFET array manufactured by Alpha & Omega Semiconductor Inc. It features a drain-source voltage (Vdss) of 30V and a continuous drain current (Id) of 4.5A at 25°C. The device utilizes advanced trench technology to achieve a maximum on-resistance (Rds(on)) of 22mΩ at Vgs=10V. Key electrical parameters include a gate charge (Qg) of 11nC at 10V, an input capacitance (Ciss) of 520pF at 15V, and a threshold voltage (Vgs(th)) of 2.5V max at 250µA. Power dissipation is rated at 2W, with an operating junction temperature range of -55°C to 150°C.

Feature Summary

• Dual N-channel configuration in a single package for compact design
• Advanced trench technology for low on-resistance and gate charge
• Logic-level gate drive capability for efficient switching

Applications

• Synchronous rectification in DC-DC converters
• Load switching applications
• Motor control circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct packaging and tape/reel specifications. Confirm that the component status is suitable for new designs, as availability may vary. Cross-reference the pinout and thermal characteristics with the official documentation before finalizing procurement orders.

Selection Notes

Select the AO4842 for applications requiring a dual N-channel solution with 30V rating and high current handling up to 4.5A. Consider its low Rds(on) for efficiency in power conversion. Ensure the PCB layout supports the SOIC-8 package thermal requirements. Verify gate drive voltage compatibility with the logic-level threshold specifications provided in the datasheet.

Part Context

The AO4842 belongs to the AO48xx series of dual MOSFET arrays from Alpha & Omega Semiconductor. These components are designed to replace discrete transistor pairs, saving board space and improving performance through matched characteristics. The series is commonly used in portable electronics and power management systems where size and efficiency are critical constraints.

Replacement Considerations

Check for direct substitutes such as the AO4803A if P-channel functionality is required instead of N-channel. Verify pin-to-pin compatibility and electrical parameter overlaps with other dual N-channel MOSFETs from different manufacturers before substitution.