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Alpha & Omega Semiconductor Inc. AOZ8251ADI-05
- Part No.:
- AOZ8251ADI-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
AOZ8251ADI-05.pdf
- Description:
- TVS DIODE 5VWM 28VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,936
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Product details
Overview
AOZ8251ADI-05 from Alpha and Omega Semiconductor is a single-channel bidirectional TVS diode in a 0201 DFN package (0.62 mm × 0.32 mm × 0.3 mm), rated for 5 V reverse working voltage, ±20 kV IEC 61000-4-2 contact/air ESD protection, 10 pF junction capacitance, and 4 A peak pulse current - designed to protect high-speed data lines in space-constrained portable electronics.
For engineers reviewing the AOZ8251ADI-05 datasheet, pinout, applications, or equivalent options, key selection considerations include clamping voltage under 8/20 µs surge (11.5–13 V), low dynamic resistance (0.5 Ω), RoHS-compliant green packaging, and operation across –40°C to +85°C ambient temperature.
Technical Context
This bidirectional TVS diode operates symmetrically across its two terminals, enabling transient suppression on unidirectional signal lines without polarity constraints. It delivers sub-13 V clamping at 4 A (8/20 µs) and maintains ≤12 pF capacitance at 1 MHz, preserving signal integrity on USB, I²C, and touch interface lines.
The device leverages silicon avalanche structure with controlled breakdown at 6.5 V (typical VBR) and low leakage (<100 nA at 5 V VRWM). Its ultra-small 0201 footprint supports high-density PCB layouts while meeting Level 4 ESD immunity per IEC 61000-4-2 and HBM ±15 kV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage (VRWM) | 5 V - maximum continuous DC voltage before conduction begins; sets operating margin for 5 V logic/data lines. |
| Breakdown Voltage (VBR) | 6.5 V (typ.) - guaranteed avalanche onset at 1 mA; ensures reliable triggering above normal signal swing. |
| Clamping Voltage (VCL) | 11.5–13 V at ±4 A (8/20 µs) - limits transient voltage seen by protected IC, preventing latch-up or damage. |
| Junction Capacitance (CJ) | 10–12 pF at 0 V, 1 MHz - low enough to avoid signal distortion on >10 Mbps interfaces like USB 2.0 or I²C. |
| ESD Rating (IEC 61000-4-2) | ±20 kV air & contact - exceeds Level 4 requirement, enabling robust front-end protection for handheld device buttons and ports. |
| Dynamic Resistance (RDNY) | 0.5 Ω - minimizes voltage overshoot during fast transients, improving clamping consistency across pulse amplitude. |
| Ambient Temperature Range | –40°C to +85°C - validated for consumer and industrial portable equipment environments. |
Pinout & Package
AOZ8251ADI-05 uses a 2-terminal DFN 0.62 mm × 0.32 mm × 0.3 mm (0201) package with no internal die attach pad. Both terminals are symmetrical and function as bidirectional I/O pins for single-line transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional I/O Anode/Cathode | Connects to protected signal line; conducts equally in both directions during overvoltage events. |
| Terminal 2 | Bidirectional I/O Anode/Cathode | Connects to system ground reference; completes low-impedance path for transient current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD protection | Enables single-device protection of AC-coupled or polarity-agnostic lines (e.g., USB D+/D–, I²C SDA/SCL) without orientation concerns. |
| Ultra-low 0201 footprint | Reduces PCB area by >50% vs. 0402 TVS devices, critical for slim smartphones, wearables, and compact IoT sensors. |
| 10 pF junction capacitance | Maintains signal rise/fall times <1 ns on 50 Ω traces, supporting high-speed interfaces up to 480 Mbps without added jitter. |
| Low clamping voltage (11.5 V) | Keeps protected IC's absolute maximum rating margin ≥2 V under worst-case 4 A surge, reducing risk of gate oxide stress. |
| RoHS-compliant green packaging | Meets global environmental regulations and eliminates halogenated flame retardants, supporting sustainable manufacturing compliance. |
Applications
| USB 2.0 Data Lines | Touchscreen I/O Lines |
|---|---|
Use Scenario: Protecting D+ and D– differential pairs in smartphone USB ports against repeated electrostatic discharge during cable insertion. IC Role / Device Role: Bidirectional transient voltage suppressor placed between connector and USB PHY IC. Use Value: Prevents PHY latch-up or permanent damage while maintaining <12 pF loading to preserve eye diagram integrity at 480 Mbps. | Use Scenario: Shielding capacitive touchscreen controller I/O pins from ESD events caused by finger contact on glass overlay. IC Role / Device Role: Low-capacitance TVS on each X/Y electrode line to clamp transients before reaching analog front-end. Use Value: Enables reliable touch response after ±20 kV contact discharge without false triggers or calibration drift. |
| Keypad/Button Interfaces | Portable GPS RF Front-End |
Use Scenario: Guarding mechanical or capacitive keypad scan lines in ruggedized handheld terminals exposed to field ESD. IC Role / Device Role: Single-line TVS on each row/column line to absorb human-body-model discharges before MCU GPIO input. Use Value: Eliminates firmware reset events and contact bounce artifacts induced by ±15 kV HBM transients. | Use Scenario: Protecting GPS antenna feedline and LNA enable/control lines from ESD coupling through metal housing seams. IC Role / Device Role: Signal-line TVS on RF bias and digital control paths adjacent to sensitive GNSS receiver circuitry. Use Value: Preserves RF noise figure and acquisition sensitivity by limiting transient-induced baseband corruption below –100 dBm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | DO-214AC package (4.5 mm × 3.3 mm); 5.0 V VRWM; 100 pF capacitance; 40 A IPP | Designed for board-level power rail protection, not high-speed signal lines | Select only when PCB space allows larger footprint and signal bandwidth <1 MHz |
| TPD2E001DRYR | 2-channel unidirectional TVS in 0.9 mm × 0.7 mm USON; 5 V VRWM; 12 pF per channel; ±8 kV IEC 61000-4-2 | Requires separate ground connection per channel; lower ESD rating than AOZ8251ADI-05 | Choose for multi-line protection where layout permits dual-channel routing and ±8 kV suffices |
Compared with SMAJ5.0A and TPD2E001DRYR, AOZ8251ADI-05 uniquely combines 0201 size, ±20 kV ESD rating, and 10 pF capacitance - making it the only option suitable for miniaturized, high-speed, single-line protection where board area and signal fidelity are simultaneously constrained.
Availability
AOZ8251ADI-05 is available at Aetrix Electronics and suitable for portable hand-held devices, touchscreen interfaces, and compact GPS modules requiring stable component supply with full traceability and lifecycle management.
Supply support for AOZ8251ADI-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 AOZ8251ADI series targets space-constrained, battery-powered electronics needing certified ESD protection - emphasizing ultra-small footprints, low capacitance, and automotive-grade reliability without thermal derating penalties.
FAQ
What is the clamping voltage of AOZ8251ADI-05 under an 8/20 µs surge?
The AOZ8251ADI-05 clamps to 11.5–13 V at ±4 A under IEC 61000-4-5 8/20 µs surge conditions. This value is measured between the I/O pin and ground with specified test waveform and is guaranteed across temperature and process variation per datasheet Rev. 2.0.
Does AOZ8251ADI-05 support bidirectional signal lines like USB D+ and D–?
Yes, AOZ8251ADI-05 is inherently bidirectional due to its symmetrical avalanche structure. It protects AC-coupled or differential lines such as USB 2.0 D+/D– without polarity sensitivity - confirmed by identical positive/negative clamping curves in the datasheet TLP plots.
What is the junction capacitance of AOZ8251ADI-05 and how does it affect high-speed signals?
The AOZ8251ADI-05 exhibits 10–12 pF junction capacitance at 0 V and 1 MHz. This low value avoids measurable rise-time degradation on 50 Ω traces used in USB 2.0 or I²C, ensuring signal integrity remains intact up to 480 Mbps without added termination complexity.
Is AOZ8251ADI-05 RoHS compliant and halogen-free?
Yes, AOZ8251ADI-05 is an AOS Green Product: fully RoHS compliant and manufactured with reduced halogen content per AOS Green Policy. The device meets JEDEC J-STD-609 Category 1a for bromine/chlorine limits and carries no exemption markings.
What is the operating temperature range for AOZ8251ADI-05?
AOZ8251ADI-05 is rated for ambient operation from –40°C to +85°C, with junction temperature extending to +125°C. This range is validated per AOS qualification standards and supports deployment in consumer handhelds, automotive infotainment peripherals, and industrial portable instruments.
AOZ8251ADI-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 0201 (0603 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6.5V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 4A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 10pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (0.62x0.32)
AOZ8251ADI-05 FAQ
1.How can I place an order for AOZ8251ADI-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8251ADI-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 AOZ8251ADI-05 reliable?
The price and inventory of AOZ8251ADI-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8251ADI-05 is usually 5 days.
3.What payment methods are accepted for AOZ8251ADI-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8251ADI-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8251ADI-05?
AOZ8251ADI-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8251ADI-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 AOZ8251ADI-05?
For technical support, including AOZ8251ADI-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8251ADI-05 requirements.
6.How does Aetrix verify that AOZ8251ADI-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8251ADI-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 AOZ8251ADI-05 meets industry standards.
7.What is the process for return or replacement of AOZ8251ADI-05?
All AOZ8251ADI-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8251ADI-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 AOZ8251ADI-05 part is unused and in its original packaging.
Return procedure for AOZ8251ADI-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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