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Alpha & Omega Semiconductor Inc. AOZ8S502BS2-05
- Part No.:
- AOZ8S502BS2-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 3-SMD, SOT-23-3 Variant
- Datasheet:
-
AOZ8S502BS2-05.pdf
- Description:
- 2CH 5V BIDIRECTIONAL TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
AOZ8S502BS2-05 from Alpha & Omega Semiconductor is a 2-channel bidirectional transient voltage suppressor (TVS) designed for ESD and surge protection of dual data lines. It delivers 18 pF junction capacitance, ±30 kV IEC 61000-4-2 ESD immunity (contact/air), 10 A IEC 61000-4-5 surge rating, and 5 V reverse working voltage - enabling robust protection in high-speed audio interfaces of mobile phones and notebooks.
For engineers reviewing the AOZ8S502BS2-05 datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping performance, low capacitance for signal integrity, SOT23-3L footprint compatibility, and compliance with IEC 61000-4-2/4-4/4-5 standards for consumer-grade portable electronics.
Technical Context
The AOZ8S502BS2-05 integrates two independent bidirectional TVS diodes in a single SOT23-3L package, with Pin 1 and Pin 2 serving as protected I/O terminals and Pin 3 as common ground. Its snapback-type clamping behavior ensures stable hold voltage (5 V) and low clamping voltage (6.5 V at 1 A TLP) across both polarities.
It operates over –40°C to +125°C junction temperature, supports 5 V DC power rail and audio line protection, and meets stringent ESD (±30 kV), EFT (40 A), and surge (10 A, 8/20 µs) requirements without degrading signal fidelity due to its 18 pF capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | 2-channel bidirectional TVS diode array for dual-line protection |
| Reverse Working Voltage (VRWM) | 5 V - sets maximum continuous operating voltage before conduction begins |
| Junction Capacitance (CJ) | 18 pF at 1 MHz - preserves signal integrity on high-speed audio/data lines |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact/air - exceeds industrial and consumer immunity requirements |
| Surge Rating (IEC 61000-4-5) | ±10 A (8/20 µs) - withstands lightning-induced transients on power/audio rails |
| Clamping Voltage (VCL) | 6.5 V at 1 A TLP - limits voltage seen by downstream ICs during fast transients |
| Operating Temperature | –40°C to +125°C TJ - supports deployment in battery-powered and thermally constrained devices |
Pinout & Package
SOT23-3L package: compact, surface-mount, RoHS-compliant, halogen-free plastic case with gull-wing leads; 1.3 mm × 2.9 mm footprint, 1.0 mm height, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O1 (Protected Line) | Bidirectional transient path for first signal line - connects to audio jack, USB D+, or similar interface |
| Pin 2 | I/O2 (Protected Line) | Bidirectional transient path for second signal line - used for audio return, USB D−, or auxiliary rail |
| Pin 3 | GND (Common Reference) | Shared cathode/anode reference for both TVS channels - must connect to low-impedance system ground |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables symmetric protection of AC-coupled lines (e.g., stereo audio) without polarity constraints |
| Low 18 pF junction capacitance | Minimizes insertion loss and signal distortion on 10–20 MHz audio paths |
| 5 V VRWM with 5.7 V min breakdown | Ensures no leakage or conduction during normal 5 V rail operation while triggering reliably under fault |
| ±30 kV IEC 61000-4-2 ESD rating | Meets highest consumer-grade ESD immunity requirement for handheld device interfaces |
| 10 A IEC 61000-4-5 surge capability | Provides margin against induced surges in compact PCB layouts near connectors or antennas |
Applications
| Headphone Jack Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting 3.5 mm TRRS headphone jacks in smartphones against user-hand ESD events during plug insertion/removal. IC Role / Device Role / Timing Role: Bidirectional TVS array clamping transients between left/right audio channels and ground before they reach codec IC inputs. Use Value: Prevents audio pop/crackle and permanent input-stage damage using 18 pF capacitance that avoids bass roll-off. | Use Scenario: Safeguarding USB 2.0 D+ and D− lines in portable chargers and OTG adapters from cable-discharge events. IC Role / Device Role / Timing Role: Dual-channel TVS absorbing ±30 kV ESD strikes while maintaining <1 ns response time and minimal signal reflection. Use Value: Ensures USB enumeration reliability and prevents PHY latch-up without degrading 480 Mbps eye diagram integrity. |
| Mobile Speaker Amplifier Input | Notebook Audio Codec Interface |
Use Scenario: Shielding Class-D amplifier inputs in slim tablets from ESD coupling via flex cables connecting to speakers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp limiting transient voltage to ≤6.5 V during 1 A TLP events on differential analog inputs. Use Value: Eliminates speaker click-on-power-up and preserves SNR >100 dB by avoiding parasitic loading on amplifier feedback networks. | Use Scenario: Protecting high-fidelity audio codec I²S or PDM digital audio lines in ultrabooks exposed to handling ESD during manufacturing and field use. IC Role / Device Role / Timing Role: Dual-channel TVS placed adjacent to codec BGA package to shunt transients before signal routing to DSP or SoC. Use Value: Maintains bit-error-free transmission at 3.072 MHz sampling rates with no added jitter from capacitive loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Unidirectional, higher capacitance (≈100 pF), DO-214AC package (larger, 4.5 mm × 3.9 mm) | Requires separate devices per line; unsuitable for space-constrained audio interfaces | Select only if board area allows larger package and unidirectional biasing is acceptable |
| TPD2E001DRSR | 2-channel bidirectional, lower capacitance (12 pF), same SOT23-3L footprint, but rated only to ±8 kV HBM / ±15 kV IEC ESD | Limited surge immunity (IEC 61000-4-5: 3 A), insufficient for harsh-environment USB ports | Prefer for cost-sensitive, low-surge applications where 12 pF is critical and ±30 kV ESD not required |
Compared with SMAJ5.0A and TPD2E001DRSR, the AOZ8S502BS2-05 uniquely combines ±30 kV ESD, 10 A surge, 18 pF, and SOT23-3L in one device - making it optimal for compact, high-immunity audio/data line protection where board space and immunity level are co-constrained.
Availability
AOZ8S502BS2-05 is available at Aetrix Electronics and suitable for mobile phone audio interfaces, notebook USB 2.0 protection, and portable speaker amplifier inputs requiring stable component supply and full IEC 61000-4-2/4-4/4-5 compliance.
Supply support for AOZ8S502BS2-05 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 & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, TVS diodes, and power ICs for efficiency-critical applications.
The AOZ8S502BS2-05 belongs to AOS's Green TVS family, engineered specifically for ultra-low-capacitance, high-immunity ESD/surge protection in space-constrained portable electronics.
FAQ
What is the clamping voltage of AOZ8S502BS2-05 under IEC 61000-4-5 surge conditions?
The AOZ8S502BS2-05 exhibits a clamping voltage of 6.5 V at 2 A and 8.5 V at 10 A under IEC 61000-4-5 8/20 µs surge testing. This low clamping performance ensures downstream components like audio codecs or USB transceivers remain within safe operating voltage limits during transient events. The specified values are measured per standard test setup with defined source impedance and waveform parameters.
Is AOZ8S502BS2-05 compatible with 3.3 V logic interfaces?
Yes, AOZ8S502BS2-05 is compatible with 3.3 V logic interfaces. Its 5 V reverse working voltage (VRWM) provides sufficient margin above 3.3 V nominal rails, and its 5.7 V minimum breakdown voltage ensures no conduction during normal operation. The device clamps transients well below destructive thresholds for 3.3 V I/O cells, preserving signal integrity without leakage or false triggering.
Does AOZ8S502BS2-05 require external biasing or current-limiting resistors?
No, AOZ8S502BS2-05 requires no external biasing or current-limiting resistors. As a passive bidirectional TVS diode array, it operates inherently without bias supply. Its snapback characteristics and low dynamic resistance enable self-triggering and energy diversion directly to ground (Pin 3). Series resistors are unnecessary unless specific system-level filtering or current sharing is required beyond basic ESD/surge suppression.
What is the thermal derating behavior of AOZ8S502BS2-05 above 25°C ambient?
The AOZ8S502BS2-05 is characterized up to +125°C junction temperature, with all electrical specifications guaranteed across –40°C to +125°C. Derating is not applied to peak pulse ratings (e.g., 10 A surge) because these are short-duration events (<100 ms); however, sustained power dissipation must remain within package thermal limits. PCB copper area and layout directly influence achievable thermal performance in continuous fault scenarios.
Can AOZ8S502BS2-05 protect differential signaling pairs like I²S or MIPI?
Yes, AOZ8S502BS2-05 can protect differential signaling pairs such as I²S clock/data lines when configured as two independent single-ended clamps (I/O1 and I/O2 referenced to common GND). Its 18 pF capacitance introduces negligible skew between lines, and bidirectional operation maintains signal symmetry. For true differential-mode transient suppression, a dedicated differential TVS (e.g., AOZ8206CI) is recommended - but AOZ8S502BS2-05 remains effective for common-mode ESD on each line.
AOZ8S502BS2-05 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):
- 5V (Max)
- Voltage - Breakdown (Min):
- 5.7V
- Voltage - Clamping (Max) @ Ipp:
- 8.5V (Typ)
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 18pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AOZ8S502BS2-05 FAQ
1.How can I place an order for AOZ8S502BS2-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8S502BS2-05 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 AOZ8S502BS2-05 reliable?
The price and inventory of AOZ8S502BS2-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8S502BS2-05 is usually 5 days.
3.What payment methods are accepted for AOZ8S502BS2-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8S502BS2-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8S502BS2-05?
AOZ8S502BS2-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8S502BS2-05 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 AOZ8S502BS2-05?
For technical support, including AOZ8S502BS2-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8S502BS2-05 requirements.
6.How does Aetrix verify that AOZ8S502BS2-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8S502BS2-05 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 AOZ8S502BS2-05 meets industry standards.
7.What is the process for return or replacement of AOZ8S502BS2-05?
All AOZ8S502BS2-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8S502BS2-05, 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 AOZ8S502BS2-05 part is unused and in its original packaging.
Return procedure for AOZ8S502BS2-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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