Alpha & Omega Semiconductor Inc. AOZ8204DI

Overview

AOZ8204DI from Alpha and Omega Semiconductor is a four-line transient voltage suppressor (TVS) diode array designed for ESD protection of high-speed data lines. It features 5.0V reverse working voltage, ±30kV IEC 61000-4-2 contact/air discharge rating, 7.0V clamping voltage at 15A, 15–17pF junction capacitance, and operates from –40°C to +85°C ambient. It is used in portable digital cameras and GPS receivers to safeguard unidirectional or bidirectional signal paths.

For engineers reviewing the AOZ8204DI datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 15A transients, low capacitance for high-speed interfaces, DFN 1.6×1.6mm package footprint, dual configuration flexibility (4-line unidirectional or 2-line bidirectional), and compliance with IEC 61000-4-2 Level 4 ESD immunity.

Technical Context

The AOZ8204DI integrates four TVS diodes in a single DFN-6 package using AOS's Trench Vertical Structure [TVS]²™ technology, enabling low clamping voltage and fast response to ESD events. Its design supports two distinct protection topologies: unidirectional protection of four independent I/O lines (pins 1/3/4/6 to signals, pin 2 to ground) or bidirectional protection of two differential pairs (pins 1/3 to signals, pins 4/6 to ground).

Electrical behavior is defined by a 5.0V VRWM, 6.0V typical breakdown voltage at 1mA, sub-1µA leakage at rated voltage, and symmetrical clamping performance-+7.0V/–6.75V at 15A and +7.50V/–10.25V at 25A-with junction capacitance tightly controlled between 15pF and 17pF at 0V bias and 1MHz.

Key Specifications

Pinout & Package

AOZ8204DI is housed in a RoHS-compliant, lead-free DFN 1.6×1.6 mm, 6-lead package with exposed thermal pad (no internal thermal slug connection). Pin 1 is marked by a dot; the device has no polarity marking on the body beyond the pin 1 identifier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ5.0A and TPD4E05U06DQAR, the AOZ8204DI delivers balanced performance: moderate 15–17pF capacitance for USB 2.0/HDMI compatibility, 15A surge capability for robustness, and dual-configuration flexibility-making it optimal for mid-speed portable interfaces where size, cost, and ESD margin must coexist.

Availability

AOZ8204DI is available at Aetrix Electronics and suitable for portable GPS receivers, digital cameras, notebook computers, and MP3 players requiring stable component supply and certified ESD protection.

Supply support for AOZ8204DI 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 and Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, TVS diodes, and power ICs for efficiency-critical applications.

The AOZ8204DI belongs to AOS's TVS Diode Array product line, engineered specifically for high-density ESD protection of high-speed consumer interface buses while minimizing PCB area and signal degradation.

FAQ

What is the maximum clamping voltage of the AOZ8204DI under a 15A transient?

The AOZ8204DI exhibits a maximum clamping voltage of +7.0V for positive transients and –6.75V for negative transients when subjected to a 15A, 100ns pulse. This specification is measured between any I/O pin and ground, ensuring predictable voltage limiting for downstream 5V logic components during ESD events. The symmetric clamping behavior supports bidirectional signal protection without polarity constraints in the AOZ8204DI design.

Can the AOZ8204DI be used to protect USB 2.0 data lines?

Yes, the AOZ8204DI is suitable for USB 2.0 D+ and D− line protection. Its 15–17pF junction capacitance meets USB 2.0 signal integrity requirements, and its ±30kV IEC 61000-4-2 rating exceeds standard compliance thresholds. In bidirectional mode (pins 1/3 = D+/D−, pins 4/6 = GND), the AOZ8204DI provides matched clamping for both signal polarities while occupying only 2.56 mm² of PCB area.

What is the recommended PCB layout for optimal ESD performance with the AOZ8204DI?

For optimal ESD suppression, place the AOZ8204DI as close as possible to the protected connector, minimize trace length between pins 1/3/4/6 and the signal lines, connect pin 2 (or pins 4/6 in bidir mode) directly to a solid ground plane with short, wide traces, and avoid routing protected signals near board edges. These practices reduce parasitic inductance that could degrade clamping response-critical for achieving the specified performance of the AOZ8204DI under fast-rising ESD pulses.

Does the AOZ8204DI support both unidirectional and bidirectional protection configurations?

Yes, the AOZ8204DI supports two distinct configurations: unidirectional protection of four independent I/O lines (pins 1/3/4/6 to signals, pin 2 to ground) and bidirectional protection of two differential pairs (pins 1/3 to signals, pins 4/6 to ground). This dual-mode capability is enabled by its internal diode architecture and eliminates the need for separate part numbers-providing design flexibility without sacrificing performance in the AOZ8204DI implementation.

What is the operating temperature range for the AOZ8204DI?

The AOZ8204DI is rated for continuous operation across an ambient temperature range of –40°C to +85°C, with a junction temperature limit of –40°C to +125°C. This range supports reliable deployment in consumer electronics such as portable GPS units and digital cameras, where internal temperatures may rise significantly during extended use-ensuring consistent ESD protection performance throughout the operational life of the AOZ8204DI.