Alpha & Omega Semiconductor Inc. AOZ8S204BL2-05

Overview

AOZ8S204BL2-05 from Alpha and Omega Semiconductor is a dual-channel bidirectional TVS diode designed for ESD and transient protection of high-speed differential data lines including USB4, Thunderbolt 4, and PCIe. It features 0.15 pF typical junction capacitance, ±20 kV IEC 61000-4-2 contact/air ESD rating, 8.5 A IEC 61000-4-5 surge current capability, 3.3 V/5 V operating voltage support, and WLCSP 0.63 mm × 0.33 mm package.

For engineers reviewing the AOZ8S204BL2-05 datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low capacitance for signal integrity preservation, bidirectional clamping for full-duplex line protection, low clamping voltage (≤6 V at 8.5 A), RoHS-compliant WLCSP footprint, and validated performance up to 20 Gbps (Thunderbolt 3.0).

Technical Context

The AOZ8S204BL2-05 implements snapback-based bidirectional TVS architecture with 1.6 V holding voltage and 0.2 Ω dynamic resistance, enabling fast response to transients while minimizing voltage overshoot on protected lines. Its TLP-tested clamping behavior-2.5 V at 1 A and 6 V at 16 A-ensures robust protection without signal distortion.

Designed specifically for high-speed serial interfaces, it maintains sub-0.2 pF capacitance across 0–5 V bias, preserving eye diagram integrity in USB3.2 Gen2 (10 Gbps), HDMI2.1 (12 Gbps), and Thunderbolt 3.0 (20 Gbps) applications as verified in manufacturer test reports.

Key Specifications

Pinout & Package

AOZ8S204BL2-05 uses a 3-terminal WLCSP (Wafer-Level Chip Scale Package) with 0.63 mm × 0.33 mm footprint and 0.3 mm pitch. The device integrates two independent bidirectional TVS channels sharing a common ground terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6J33A-Q and TPD4E05U06DQAR, AOZ8S204BL2-05 uniquely delivers <0.2 pF capacitance with ±20 kV ESD and 8.5 A surge rating in a 0.63 mm × 0.33 mm WLCSP-enabling direct integration into next-generation 40 Gbps interconnects where signal fidelity and board area are limiting factors.

Availability

AOZ8S204BL2-05 is available at Aetrix Electronics and suitable for USB4 interface protection, Thunderbolt 4 port hardening, and PCIe Gen5 lane safeguarding requiring stable component supply across high-volume consumer electronics and enterprise computing programs.

Supply support for AOZ8S204BL2-05 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 power conversion, protection, and interface applications.

The AOZ8S204BL2 product line targets ultra-high-speed data line protection, delivering sub-0.2 pF TVS solutions optimized for USB4, Thunderbolt, PCIe, and MIPI interfaces in space-constrained portable and infrastructure equipment.

FAQ

What is the exact package type and dimensions of AOZ8S204BL2-05?

AOZ8S204BL2-05 uses a Wafer-Level Chip Scale Package (WLCSP) measuring 0.63 mm × 0.33 mm with a 0.3 mm pitch and three terminals. This package is RoHS-compliant, Pb-free, and rated MSL1 per J-STD-020. The compact size enables placement directly adjacent to high-speed connectors without introducing parasitic inductance or trace stubs that impair signal integrity in AOZ8S204BL2-05 applications.

Does AOZ8S204BL2-05 support both 3.3 V and 5 V data lines?

Yes, AOZ8S204BL2-05 is specified for reverse working voltages of both 3.3 V and 5 V, making it compatible with multiple interface standards including USB4 (3.3 V nominal), Thunderbolt 4 (5 V tolerant), and PCIe Gen5 auxiliary rails. Its 6 V minimum breakdown voltage and 5.8 V clamping at 8.5 A ensure safe operation across these voltage domains without false triggering during normal signal swings in AOZ8S204BL2-05 deployments.

How does AOZ8S204BL2-05 achieve 0.15 pF capacitance while maintaining ±20 kV ESD protection?

AOZ8S204BL2-05 achieves ultra-low capacitance through optimized silicon geometry and shallow-junction design in its snapback TVS structure, validated by TLP and 1 MHz C-V measurements. Its 0.15 pF value is measured at 0 V bias and 1 MHz, and remains below 0.2 pF up to 5 V-enabling retention of ±20 kV IEC 61000-4-2 rating without compromising high-speed signal fidelity in AOZ8S204BL2-05 implementations.

Is AOZ8S204BL2-05 pin-compatible with AOZ8S204BL2-03?

Yes, AOZ8S204BL2-05 and AOZ8S204BL2-03 share identical pin configuration, package outline, and terminal assignment (I/O1, I/O2, I/O3). The only difference is VRWM rating: AOZ8S204BL2-03 is rated for 3.3 V, while AOZ8S204BL2-05 supports both 3.3 V and 5 V operation. Both variants use the same WLCSP 0.63 mm × 0.33 mm footprint and are marked "Any Pin to Pin" in official documentation, confirming mechanical and electrical interchangeability in AOZ8S204BL2-05 design-in scenarios.

Can AOZ8S204BL2-05 be used for HDMI 2.1 protection?

Yes, AOZ8S204BL2-05 is validated for HDMI 2.1 applications, as confirmed by manufacturer eye diagram testing at 12 Gbps. Its 0.15 pF capacitance prevents insertion loss and jitter accumulation on TMDS clock and data lanes, while ±20 kV ESD rating and 5.8 V clamping voltage protect sink/source ICs from connector-level discharges. AOZ8S204BL2-05's −40°C to +125°C operating range further supports deployment in thermally demanding AV receiver and monitor designs.