Alpha and Omega Semiconductor Unveils Powerful Duo of Protection Switches that Support Type-C EPR 3.1 Extended Power Levels

SUNNYVALE, Calif., Sep. 16, 2025 – Alpha and Omega Semiconductor Limited (AOS) (Nasdaq: AOSL) a designer, developer, and global supplier of a broad range of discrete power devices, wide bandgap power devices, power management ICs, and modules, today announced two powerful Type-C sink and source protection switches. AOS designed these switches to increase the power delivery capability of USB Type-C ports to 240W, paving the way for Type-C extended power range (EPR) implementations. The AOZ13058DI offers overvoltage/overcurrent protection features suited for 48V Type-C sinking applications, while the AOZ15953DI provides the additional protection features needed for Type-C sourcing applications. These new switches help designers safeguard 48V Type-C EPR capabilities to enhance reliability and functionality in high-performance and gaming laptops, personal computers, monitors, docking, and other higher-power connected portable devices.

The AOZ13058DI features an ultra-low 20 milliohm resistance and provides a comprehensive set of features including programmable soft-start, overvoltage, ideal diode reverse-current, short-circuit, overcurrent, overtemperature, and ESD protection. These features also help isolate and protect downstream components from abnormal VBUS voltage and potentially harmful current conditions. Ideal diode fast reverse current protection allows multiple power paths to be connected in parallel without interference. The switch’s integrated positive and negative transient voltage suppression at VIN enhances immunity to voltage spikes meeting IEC safety standards (IEC61000-4-2: ±8kV contact, ±15kV contact; IEC61000-4-5: 20A (8/20µs) on VIN and VOUT). The AOZ13058DI also features a programmable current limit function, permitting its application as a sourcing switch in an EPR 3.1 docking system.

The AOZ15953DI can source 5V at 3.5A while blocking up to 48V, and is UL 2367 and IEC 62368-1:2018 (3rd Edition) certified as a current limiting switch optimized for Type-C sourcing applications. This protection switch shields against numerous fault conditions, providing VIN Overvoltage Protection (OVP), Startup Short-Circuit Protection (SCP), Overtemperature Protection (OTP), and has a programmable ILIMIT pin.

“The AOZ13058DI and AOZ15953DI are a powerful duo of protection switches that enable designers to implement simple, efficient, and safe USB Type-C PD3.1 EPR applications up to 240W,” said James Wang, Manager, Power ICs at AOS. “With the ability to withstand up to +55V on VBUS, these new sink and source switches deliver the safety margin developers require to build 48V systems. AOS’ packaging expertise enables the integration of industry-leading, back-to-back, high SOA, low RDS(on) trench MOSFETs with an IC controller. This approach reduces solution footprint, lowers power dissipation and provides ideal diode functionality as well as protection features that enhance system reliability.”  

Technical Highlights

48V Type-C EPR Source: AOZ15953DI

• 2.7V to 5.5V Operating range, Absolute Maximum at VOUT = 60V
• 3.5A current capability
• 35 milliohm On-resistance in DFN4x4-16L package
• Ideal Diode True reverse current blocking (IDTRCB)
• Supports Fast Role Swap (FRS)
• VIN Overvoltage Protection (OVP), Startup Short-Circuit Protection (SCP), Overtemperature Protection (OTP)
• Programmable ILIM

48V Type-C EPR Sink (and high-power sourcing): AOZ13058DI

• 3.3V to 55V Operating range, Absolute Maximum = 60V
• RON = 20 milliohm
• 7A continuous current capability, 20A peak for 10ms @ 2% duty cycle
• Ideal Diode True reverse current blocking
• Programmable soft start
• VIN Overvoltage Protection (OVP), Startup Short-Circuit Protection (SCP), Overtemperature Protection (OTP)
• Programmable ILIM for high power sourcing applications
• Meet IPC-2221A standard
• DFN5.2x4-20L package

Pricing and Availability

The AOZ15953DI and AOZ13058DI are available in production quantities with a lead-time of 16 weeks. The unit price in 1,000-piece quantities is $2.12 for the AOZ15953DI and $2.77 for the AOZ13058DI. AOS products are offered in packages with Pb-free plating and are RoHS compliant.