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Alpha & Omega Semiconductor Inc. AOZ8S401US4-05
- Part No.:
- AOZ8S401US4-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
AOZ8S401US4-05.pdf
- Description:
- TVS DIODE 5VWM 6VC SOT-23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,118
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Product details
Overview
AOZ8S401US4-05 from Alpha and Omega Semiconductor is a 4-channel unidirectional TVS diode array designed for ESD protection of high-speed USB2.0 data lines in notebook computers. It features 1.2 pF I/O-to-GND capacitance, ±30 kV IEC 61000-4-2 contact/air discharge rating, 5.0 V operating voltage, and clamps to ≤2.5 V at ±1 A TLP current.
For engineers reviewing the AOZ8S401US4-05 datasheet, pinout, applications, or equivalent options, key selection criteria include low-capacitance transient suppression for signal integrity, unidirectional rail-to-rail clamping architecture, IEC 61000-4-5 (9 A) surge capability, and SOT23-6L footprint compatibility with space-constrained USB port layouts.
Technical Context
The AOZ8S401US4-05 integrates eight steering diodes and one TVS element per channel pair to route transients toward VCC or GND based on polarity-enabling unidirectional clamping without external bias. Its architecture supports bidirectional signal paths (e.g., D+/D−) while maintaining strict 1.2 pF capacitance to preserve USB2.0 eye diagram integrity.
It operates within -40°C to +125°C junction temperature range and uses a RoHS-compliant, halogen-free SOT23-6L package. The device meets IEC 61000-4-2 Level 4 (±30 kV), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (±9 A, 8/20 µs) immunity standards without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent I/O protection channels for differential or single-ended lines |
| Capacitance (I/O to GND) | 1.2 pF typical - preserves USB2.0 signal rise/fall times and minimizes bit error rate |
| Clamping Voltage (±1 A TLP) | ≤2.5 V / ≤–2.5 V - limits voltage excursion below IC I/O absolute maximum ratings |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact & air - exceeds industrial and consumer end-equipment immunity requirements |
| Surge Rating (IEC 61000-4-5) | ±9 A (8/20 µs) - withstands lightning-induced surges on exposed ports |
| Operating Voltage (VRWM) | 5.0 V - matches standard USB VBUS supply, enabling direct connection without level shifters |
| Breakdown Voltage (VBR) | 6–11 V at 100 µA - ensures reliable turn-on before damage threshold of protected ICs |
Pinout & Package
SOT23-6L package: 6-pin, surface-mount, RoHS/halogen-free, footprint compatible with JEDEC MS-012AC. Dimensions: 2.9 mm × 1.6 mm × 1.1 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CH1) | I/O Channel 1 Anode | Connects to first protected line (e.g., USB D+); steers positive transients to VCC |
| 2 (VN) | Common Cathode (VCC Rail) | Internal connection point for all channel cathodes; ties to +5 V supply for positive clamping |
| 3 (CH2) | I/O Channel 2 Anode | Connects to second protected line (e.g., USB D−); same clamping behavior as CH1 |
| 4 (CH4) | I/O Channel 4 Anode | Third protected line input; shares VN node for rail-directed clamping |
| 5 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout best practice |
| 6 (CH3) | I/O Channel 3 Anode | Fourth protected line input; completes 4-channel configuration with shared VN |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Steers positive transients to VCC and negative transients to GND via integrated diode pairs - eliminates need for external bias network |
| 1.2 pF I/O-to-GND capacitance | Maintains >480 Mbps USB2.0 data integrity by limiting signal distortion and jitter accumulation |
| ±30 kV IEC 61000-4-2 ESD rating | Guarantees robustness against user-handling ESD events in portable computing environments |
| 5.0 V reverse working voltage (VRWM) | Directly interfaces with USB VBUS without series resistors or voltage dividers - simplifies BOM and layout |
| Low dynamic resistance (0.16 Ω) | Ensures stable clamping voltage under high-current surge conditions (8–16 A TLP), reducing thermal stress |
Applications
| USB2.0 High-Speed Interfaces | SD and SIM Card Slots |
|---|---|
Use Scenario: Protecting D+/D− differential pairs in laptop USB host controllers and downstream hubs from user ESD and cable coupling transients. IC Role / Device Role: Unidirectional TVS array providing rail-to-rail clamping with sub-2.5 V clamping at 1 A to safeguard PHY transceivers. Use Value: Prevents latch-up or gate oxide damage in USB transceivers while preserving 480 Mbps timing margins via 1.2 pF loading. | Use Scenario: Shielding SDIO and SIM card interface lines (CLK, CMD, DAT0–DAT3) from insertion/removal ESD and board-level coupling. IC Role / Device Role: 4-channel transient suppressor routing surges to VCC/GND rails using shared VN node and discrete anodes. Use Value: Enables compact 6-pin SOT23-6L placement adjacent to card connectors without sacrificing ESD margin or signal bandwidth. |
| Flat Panel Display Interfaces | Notebook Computer I/O Protection |
Use Scenario: Safeguarding LVDS or eDP auxiliary channel lines (HPD, I2C, backlight control) in monitor and laptop display modules. IC Role / Device Role: Low-capacitance TVS array protecting multiple low-voltage, high-impedance control signals from system-level ESD injection. Use Value: Maintains signal fidelity on 3.3 V or 5 V control buses while meeting IEC 61000-4-2 Level 4 compliance without added filtering. | Use Scenario: Consolidated ESD protection across multiple peripheral interfaces (USB, SD, audio jack, LAN LED) in space-constrained notebook mainboards. IC Role / Device Role: Single-component solution replacing discrete diodes for four independent I/O lines - reduces PCB area and assembly cost. Use Value: Achieves full IEC 61000-4-5 (9 A) and IEC 61000-4-4 (40 A) immunity with verified 125°C operation for long-term reliability in thermally dense chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode array applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J5.0A | Single-channel, 5.0 V unidirectional TVS; 100 pF capacitance; SMC package | Lacks multi-channel integration; unsuitable for high-speed data lines due to excessive capacitance | Select only when protecting DC power rails or low-frequency GPIO where bandwidth is not critical |
| SP1006-04UTG | 4-channel, 5.0 V unidirectional TVS; 0.8 pF capacitance; SOT-23-6 package; ±30 kV ESD rating | Lower capacitance improves margin for USB2.0; identical pinout but different internal VN routing | Prefer for new designs requiring tighter signal integrity; verify VN connection matches schematic topology |
Compared with SMA6J5.0A and SP1006-04UTG, the AOZ8S401US4-05 delivers optimal balance of 1.2 pF capacitance, ±30 kV ESD robustness, and integrated 4-channel architecture in SOT23-6L-making it purpose-built for USB2.0 and SD card interface protection where space and signal fidelity are co-constrained.
Availability
AOZ8S401US4-05 is available at Aetrix Electronics and suitable for USB2.0 interface protection, SD/SIM card slot hardening, and flat panel display auxiliary signal safeguarding requiring stable component supply across industrial and consumer OEM production cycles.
Supply support for AOZ8S401US4-05 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 efficiency-critical applications.
The AOZ8S401US4-05 belongs to AOS's ultra-low-capacitance TVS array product line, engineered specifically for high-speed digital interface protection in portable computing and consumer electronics.
FAQ
What is the primary circuit role of the AOZ8S401US4-05 in a USB2.0 design?
The AOZ8S401US4-05 serves as a unidirectional transient voltage suppressor array that protects the D+ and D− differential pair in USB2.0 interfaces. It routes ESD and surge energy to VCC or GND via internal steering diodes, clamping peak voltages to ≤2.5 V at ±1 A while maintaining 1.2 pF signal-line capacitance-ensuring signal integrity and IC-level reliability. This function is explicitly validated in the AOZ8S401US4-05 datasheet Figure 1 and Electrical Characteristics table.
Does the AOZ8S401US4-05 require an external bias voltage or pull-up resistor?
No, the AOZ8S401US4-05 does not require external bias components. Its internal architecture connects all channel cathodes to the VN pin, which must be tied directly to the 5.0 V supply rail (e.g., USB VBUS). This enables automatic rail-to-rail clamping without pull-ups, level shifters, or additional passives-reducing BOM count and layout complexity. The AOZ8S401US4-05 datasheet specifies VN as the common cathode node and confirms 5.0 V VRWM compatibility.
What is the meaning of the NC pin (Pin 5) on the AOZ8S401US4-05?
Pin 5 of the AOZ8S401US4-05 is designated NC (No Connect) and is internally unconnected. It must remain electrically floating in the PCB layout; grounding or routing this pin may compromise ESD performance or cause unintended leakage paths. The AOZ8S401US4-05 datasheet Pin Configuration diagram and Absolute Maximum Ratings section confirm its isolation from active circuitry.
Can the AOZ8S401US4-05 protect both positive and negative transients on the same I/O line?
Yes-the AOZ8S401US4-05 provides bidirectional transient suppression per I/O line using complementary steering diodes: positive transients are clamped to VCC via the anode-to-VN path, and negative transients are clamped to GND via the anode-to-GND path. This dual-path architecture is confirmed in the AOZ8S401US4-05 General Description and Typical Application schematic, supporting full ±30 kV IEC 61000-4-2 immunity without polarity restrictions.
Is the AOZ8S401US4-05 suitable for automotive infotainment USB ports?
The AOZ8S401US4-05 operates from –40°C to +125°C and meets IEC 61000-4-2, -4-4, and -4-5 standards-making it technically viable for non-safety-critical automotive USB applications. However, AOS explicitly prohibits use in life support systems per its Life Support Policy, and the AOZ8S401US4-05 is not AEC-Q200 qualified. For automotive deployment, validation against vehicle-level EMC and thermal cycling requirements remains the customer's responsibility per AOZ8S401US4-05 legal disclaimer.
AOZ8S401US4-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 6V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 1.2pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
AOZ8S401US4-05 FAQ
1.How can I place an order for AOZ8S401US4-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8S401US4-05 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AOZ8S401US4-05 reliable?
The price and inventory of AOZ8S401US4-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8S401US4-05 is usually 5 days.
3.What payment methods are accepted for AOZ8S401US4-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8S401US4-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8S401US4-05?
AOZ8S401US4-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8S401US4-05 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AOZ8S401US4-05?
For technical support, including AOZ8S401US4-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8S401US4-05 requirements.
6.How does Aetrix verify that AOZ8S401US4-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8S401US4-05 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AOZ8S401US4-05 meets industry standards.
7.What is the process for return or replacement of AOZ8S401US4-05?
All AOZ8S401US4-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8S401US4-05, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AOZ8S401US4-05 part is unused and in its original packaging.
Return procedure for AOZ8S401US4-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8S401US4-05 Tags
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