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Alpha & Omega Semiconductor Inc. AOZ8S502BS2-03
- Part No.:
- AOZ8S502BS2-03
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 3-SMD, SOT-23-3 Variant
- Datasheet:
-
AOZ8S502BS2-03.pdf
- Description:
- 2CH 3.3V BIDIRECTIONAL TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,486
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Product details
Overview
AOZ8S502BS2-03 from Alpha & Omega Semiconductor is a 2-channel bidirectional TVS diode array designed to protect I/O lines-specifically audio and low-voltage power rails-in mobile and computing devices against ESD (±30 kV contact/air), EFT (40 A), and surge (12 A, 8/20 µs). It features 22 pF junction capacitance, 3.3 V reverse working voltage, and low clamping voltage (5 V at 1 A TLP).
For engineers reviewing the AOZ8S502BS2-03 datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping performance, sub-6 V clamping at 1 A, SOT23-3L footprint compatibility, and compliance with IEC 61000-4-2/4-4/4-5 for portable electronics interface protection.
Technical Context
The AOZ8S502BS2-03 integrates two independent bidirectional TVS diodes sharing a common cathode/anode configuration referenced to Pin 3 (GND). Its snapback behavior delivers a hold voltage of 3.6 V at 100 mA, enabling robust overvoltage latching during transients without latch-up risk in 3.3 V systems.
It operates across –40 °C to +125 °C junction temperature, supports ≤22 pF signal-line loading at 1 MHz, and meets IEC 61000-4-2 (±30 kV), -4-4 (40 A), and -4-5 (12 A, 8/20 µs) immunity standards-validated using TLP and standardized surge waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | 2-channel bidirectional TVS diode array for I/O line protection |
| Reverse Working Voltage (VRWM) | 3.3 V - matches standard 3.3 V logic/power rail operating voltage |
| Junction Capacitance (CJ) | 22 pF at 0 V, 1 MHz - preserves signal integrity on high-speed audio/data lines |
| Clamping Voltage (VCL) | 5 V at 1 A TLP - limits transient overshoot below IC absolute maximum ratings |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact/air - exceeds Level 4 immunity requirement for handheld devices |
| Surge Rating (IEC 61000-4-5) | ±12 A (8/20 µs) - withstands induced lightning/surge events on board-level interfaces |
| Operating Temperature | –40 °C to +125 °C TJ - supports automotive cabin and industrial edge deployment |
Pinout & Package
SOT23-3L package: 3-pin, RoHS-compliant, halogen-free, surface-mount small-outline transistor outline with gull-wing leads. Pin 1 = I/O1, Pin 2 = I/O2, Pin 3 = Common GND reference for both channels.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O Channel 1 Anode/Cathode Junction | Bidirectional transient path for first protected line (e.g., MIC+, SPK+) |
| Pin 2 | I/O Channel 2 Anode/Cathode Junction | Bidirectional transient path for second protected line (e.g., MIC−, SPK−) |
| Pin 3 | Common Reference Terminal (GND) | Shared low-inductance return path for both TVS channels; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Protects AC-coupled or differential signals (e.g., audio, USB D+/D−) without polarity constraints |
| 22 pF low capacitance | Minimizes insertion loss and phase distortion on 10–20 MHz audio paths and low-speed data lines |
| 3.6 V hold voltage (IHOLD = 100 mA) | Ensures stable snapback conduction below 3.3 V rail, preventing false triggering or system reset |
| ±30 kV ESD immunity | Meets IEC 61000-4-2 Level 4 for end-user accessible ports in consumer electronics |
| SOT23-3L footprint | Enables compact layout with <1.5 mm² PCB area; compatible with standard pick-and-place and reflow processes |
Applications
| Mobile Phone Audio Interface | Notebook Computer Power Rail |
|---|---|
Use Scenario: Protecting microphone and speaker lines from user-handling ESD during plug/unplug events. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping fast-rising ESD pulses before they reach codec or amplifier ICs. Use Value: Prevents audio pop/click, codec latch-up, or permanent damage with 22 pF loading that avoids degrading analog signal fidelity. | Use Scenario: Safeguarding 3.3 V auxiliary power rails feeding USB-C port controllers or display interface ICs. IC Role / Device Role / Timing Role: Low-clamp TVS limiting surge-induced overvoltage spikes during hot-plug or cable discharge events. Use Value: Maintains rail stability under ±12 A surge stress while holding clamping below 8 V at 30 A TLP-preserving downstream IC reliability. |
| USB 2.0 Data Lines | Industrial Human-Machine Interface |
Use Scenario: ESD protection on D+ and D− lines of embedded USB host/device ports in portable instruments. IC Role / Device Role / Timing Role: Dual-channel bidirectional TVS providing symmetric clamping without DC bias dependency. Use Value: 22 pF capacitance ensures <0.5 dB insertion loss at 480 MHz, preserving USB 2.0 eye diagram integrity per USB-IF compliance. | Use Scenario: Guarding tactile button or touch-panel I/O lines exposed to factory-floor ESD in control panels. IC Role / Device Role / Timing Role: Transient suppressor absorbing repeated ±30 kV discharges without parameter drift or failure. Use Value: Rated for –40 °C to +125 °C operation and qualified to IEC 61000-4-2/4-4/4-5-ensuring long-term reliability in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ3.3A | Unidirectional, higher capacitance (≈40 pF), DO-214AC package (larger, 4.5 × 2.7 mm) | Requires separate diodes per line; unsuitable for space-constrained dual-line layouts | Choose only when unidirectional clamping suffices and board area permits larger package |
| TPD2E001DRYR | 2-channel bidirectional, lower capacitance (12 pF), same SOT-23-3L footprint, but lower surge rating (6 A vs. 12 A) | Limited to lower-energy surge environments; not rated for full IEC 61000-4-5 12 A stress | Select when ultra-low capacitance is critical and surge exposure is limited to ESD/EFT only |
Compared with SMAJ3.3A and TPD2E001DRYR, the AOZ8S502BS2-03 uniquely balances dual-channel bidirectionality, 22 pF capacitance, 12 A surge capability, and SOT23-3L size-making it optimal for compact, high-immunity audio and power-line protection where layout density and robustness are jointly constrained.
Availability
AOZ8S502BS2-03 is available at Aetrix Electronics and suitable for mobile phone audio interfaces, notebook computer power rails, and USB 2.0 data line protection requiring stable component supply across high-volume consumer electronics production cycles.
Supply support for AOZ8S502BS2-03 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 MOSFETs, TVS diodes, and power ICs for efficiency-critical applications.
The AOZ8S series targets high-density, high-immunity interface protection-designed specifically for ESD- and surge-prone I/O lines in portable and computing platforms where low capacitance and bidirectional clamping are mandatory.
FAQ
What is the clamping voltage of AOZ8S502BS2-03 at 16 A surge current?
The AOZ8S502BS2-03 has a clamping voltage of 6.5 V at 16 A TLP (100 ns pulse), per Electrical Characteristics table on page 3 of the Rev. 1.0 datasheet. This value reflects its ability to limit transient overshoot during high-current ESD events while maintaining safe voltage margins for 3.3 V interface ICs. The AOZ8S502BS2-03 achieves this via snapback diode architecture with controlled hold voltage.
Is AOZ8S502BS2-03 suitable for protecting USB 2.0 differential pairs?
Yes, AOZ8S502BS2-03 is suitable for USB 2.0 D+/D− protection due to its 22 pF capacitance (measured at 1 MHz, 0 V), bidirectional clamping, and SOT23-3L pinout allowing independent routing. Its low capacitance ensures minimal signal degradation up to 480 MHz, and its ±30 kV ESD rating exceeds USB-IF requirements. The AOZ8S502BS2-03 does not require DC bias and maintains symmetry across both channels.
What is the maximum junction temperature rating for AOZ8S502BS2-03?
The AOZ8S502BS2-03 is rated for a junction temperature range of –40 °C to +125 °C, as specified in the Maximum Operating Ratings table (page 3). This allows reliable operation in automotive cabin environments and thermally demanding industrial enclosures. Derating curves are not provided, so thermal design must ensure sustained power dissipation stays within SOA limits. The AOZ8S502BS2-03's SOT23-3L package supports this rating via optimized die attach and leadframe thermal path.
Does AOZ8S502BS2-03 meet RoHS and halogen-free requirements?
Yes, AOZ8S502BS2-03 is RoHS compliant and halogen-free, as confirmed in the Ordering Information section (page 2) and Green Product statement (page 1). It adheres to AOS Green Policy (AOSGreenPolicy.pdf), which restricts bromine, chlorine, and other halogens. This makes the AOZ8S502BS2-03 acceptable for environmentally regulated markets including EU, China, and Japan without additional compliance documentation.
How is the common terminal (Pin 3) used in AOZ8S502BS2-03 circuit implementation?
Pin 3 serves as the common reference (GND) for both bidirectional TVS channels. It must be connected directly to a low-impedance system ground plane to provide a low-inductance return path for transient currents from Pin 1 and Pin 2. Improper grounding-such as routing through vias or long traces-degrades clamping performance. The AOZ8S502BS2-03 relies on this shared GND to enable symmetrical bidirectional conduction without external bias components.
AOZ8S502BS2-03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 3-SMD, SOT-23-3 Variant
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 4.5V
- Voltage - Clamping (Max) @ Ipp:
- 7.5V (Typ)
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 22pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AOZ8S502BS2-03 FAQ
1.How can I place an order for AOZ8S502BS2-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8S502BS2-03 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 AOZ8S502BS2-03 reliable?
The price and inventory of AOZ8S502BS2-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8S502BS2-03 is usually 5 days.
3.What payment methods are accepted for AOZ8S502BS2-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8S502BS2-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8S502BS2-03?
AOZ8S502BS2-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8S502BS2-03 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 AOZ8S502BS2-03?
For technical support, including AOZ8S502BS2-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8S502BS2-03 requirements.
6.How does Aetrix verify that AOZ8S502BS2-03 is sourced from the original manufacturer or authorized distributors?
All AOZ8S502BS2-03 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 AOZ8S502BS2-03 meets industry standards.
7.What is the process for return or replacement of AOZ8S502BS2-03?
All AOZ8S502BS2-03 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8S502BS2-03, 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 AOZ8S502BS2-03 part is unused and in its original packaging.
Return procedure for AOZ8S502BS2-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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