Alpha & Omega Semiconductor Inc. AOZ8S515UDS-20

Overview

AOZ8S515UDS-20 from Alpha & Omega Semiconductor is a single-channel unidirectional TVS diode in a 1.6 mm × 1.0 mm DFN-2L package, rated for 20 V reverse working voltage, 30 A 8/20 µs surge current, and 1200 W peak pulse power. It protects power rails such as USB VBUS and battery inputs against IEC 61000-4-5 surges and IEC 61000-4-2 ±30 kV ESD events.

For engineers reviewing the AOZ8S515UDS-20 datasheet, pinout, applications, or equivalent options, this device delivers verified clamping performance (35 V at −30 A), low dynamic resistance (0.1 Ω), and junction capacitance of 200 pF - critical for high-speed power-line transient suppression without signal integrity compromise.

Technical Context

The AOZ8S515UDS-20 implements a silicon avalanche diode structure optimized for fast response to transients on DC power lines. Its unidirectional configuration provides asymmetric clamping: 35 V clamping at −30 A (negative surge) and 33.5 V at +30 A (positive surge), with TLP-measured dynamic resistance of 0.1 Ω across ±1–30 A.

It operates over −40°C to +125°C junction temperature and maintains <100 nA reverse leakage at 20 V VRWM. The 200 pF junction capacitance is characterized at 0 V bias and 1 MHz, making it suitable for moderate-speed power-rail protection where capacitive loading must be constrained.

Key Specifications

Pinout & Package

DFN1.6x1.0-2L package: 1.6 mm × 1.0 mm × 0.5 mm body, RoHS-compliant and halogen-free, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS diode applications.

Compared with SMAJ20A and SMF20A, the AOZ8S515UDS-20 delivers 3× higher peak pulse power in 40% less area, with tighter clamping (35 V vs. 32.4 V/34.4 V) and verified ±30 kV ESD performance - making it optimal for next-gen mobile and display power-rail protection where size, surge margin, and ESD robustness are jointly critical.

Availability

AOZ8S515UDS-20 is available at Aetrix Electronics and suitable for USB VBUS protection, battery input hardening, and mobile device power rail applications requiring stable component supply, long-term lifecycle support, and RoHS/halogen-free compliance.

Supply support for AOZ8S515UDS-20 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, and industrial markets.

The AOZ8S515UDS-20 belongs to AOS's high-surge TVS family, engineered specifically for compact, high-reliability protection of DC power rails in space-constrained portable and display electronics.

FAQ

What is the clamping voltage of the AOZ8S515UDS-20 at 30 A surge current?

The AOZ8S515UDS-20 clamps to 33.5 V at +30 A and 35 V at −30 A under 8/20 µs surge waveform per IEC 61000-4-5. These values are measured and guaranteed in the datasheet (Rev. 2.0, Page 3), confirming its ability to protect 24 V-rated components during worst-case transients. The AOZ8S515UDS-20 achieves this with 0.1 Ω dynamic resistance, minimizing voltage overshoot beyond the clamping threshold.

Is the AOZ8S515UDS-20 unidirectional or bidirectional?

The AOZ8S515UDS-20 is a unidirectional TVS diode, configured to protect positive power rails like USB VBUS or battery inputs. Its pinout (Anode to GND, Cathode to rail) and electrical specs - including asymmetric clamping voltages and absence of reverse standoff rating - confirm unidirectional operation. The AOZ8S515UDS-20 is not rated for bidirectional surge suppression.

What package type and dimensions does the AOZ8S515UDS-20 use?

The AOZ8S515UDS-20 uses a DFN1.6x1.0-2L package measuring 1.6 mm × 1.0 mm × 0.5 mm, with two terminals (Anode and Cathode) and no exposed thermal pad connection. This RoHS-compliant, halogen-free package is specified in the Ordering Information table (Page 2) and supports automated placement in high-density mobile PCB layouts. The AOZ8S515UDS-20's compact size directly enables placement adjacent to connectors and battery terminals.

Does the AOZ8S515UDS-20 meet IEC 61000-4-2 ESD requirements?

Yes, the AOZ8S515UDS-20 meets IEC 61000-4-2 Level 4 with ±30 kV contact and ±30 kV air discharge ratings, verified per the standard's 150 pF/330 Ω network. This performance is documented in the Absolute Maximum Ratings table (Page 2) and General Description (Page 1). The AOZ8S515UDS-20's ESD capability is integral to its design for USB and mobile interface protection.

What is the junction capacitance of the AOZ8S515UDS-20, and why does it matter?

The AOZ8S515UDS-20 has a junction capacitance of 200 pF at 0 V and 1 MHz, measured and specified in the Electrical Characteristics table (Page 3). This value is critical for power-rail protection: too high capacitance can cause inrush current or regulator instability, while too low may compromise ESD robustness. The AOZ8S515UDS-20 balances both, enabling use on 5 V–24 V rails in mobile and display systems without degrading power integrity.