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Alpha & Omega Semiconductor Inc. AOZ8351DI-04
- Part No.:
- AOZ8351DI-04
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 0805 (2012 Metric)
- Datasheet:
-
AOZ8351DI-04.pdf
- Description:
- TVS DIODE 4.8VWM 15.5VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
AOZ8351DI-04 from Alpha & Omega Semiconductor is a 1-channel unidirectional high-surge TVS diode designed for power rail protection on battery and VBUS lines. It delivers ±30 kV IEC 61000-4-2 ESD immunity, 160 A IEC 61000-4-5 surge rating, 4.8 V reverse working voltage, 1200 pF line-to-ground capacitance, and clamps to 14–15.5 V at 160 A peak pulse current-enabling robust protection in mobile device power inputs.
For engineers reviewing the AOZ8351DI-04 datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional polarity, DFN2.0×1.25A-2L package compatibility, low clamping voltage under high IPP, junction capacitance stability across bias, and compliance with IEC 61000-4-2/4-5 for consumer-grade power rail ESD/surge hardening.
Technical Context
The AOZ8351DI-04 implements a single unidirectional avalanche diode structure optimized for fast transient response on DC power rails. Its clamping behavior is characterized across three defined IEC 61000-4-5 surge currents (1 A, 100 A, 160 A), with dynamic resistance of 0.04 Ω confirming low impedance conduction during surge events.
It operates within a -40°C to +125°C junction temperature range and maintains 0.1–0.5 µA reverse leakage at 4.8 V VRWM. The 1200 pF capacitance is measured at 0 V bias and 1 MHz, making it suitable for non-high-speed signal lines where capacitive loading is acceptable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | Unidirectional TVS diode - blocks reverse current until breakdown, then clamps positive transients to ground |
| Reverse Working Voltage (VRWM) | 4.8 V - maximum continuous DC voltage applied without significant leakage or conduction |
| Clamping Voltage (VCL) | 14–15.5 V at 160 A IPP - limits peak rail voltage during worst-case lightning surge, protecting downstream ICs |
| Surge Current Rating | ±160 A (IEC 61000-4-5, 8/20 µs) - withstands industrial-grade lightning-induced surges on USB/VBUS lines |
| ESD Rating | ±30 kV contact & air (IEC 61000-4-2) - exceeds Level 4 immunity for handheld device drop-test and handling scenarios |
| Junction Capacitance (CJ) | 1200 pF at 0 V, 1 MHz - stable capacitance profile supports predictable filtering without resonance risk on low-frequency power rails |
| Package | DFN2.0×1.25A-2L - 2-pin, bottom-exposed thermal pad, 0.5 mm height, RoHS/Halogen-Free compliant |
Pinout & Package
AOZ8351DI-04 is housed in a 2-pin DFN2.0×1.25A-2L package with exposed thermal pad (EP2_S). Pin 1 is Anode; Pin 2 is Cathode. The cathode connects to system ground, enabling unidirectional clamping of positive transients on the protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Protected Line Input | Connected to battery, VBUS, or other DC rail requiring surge suppression; conducts during overvoltage |
| Pin 2 (Cathode) | Ground Reference | Connected directly to system ground plane; provides low-inductance return path for surge current |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact & air - eliminates need for secondary ESD stages in cost-sensitive mobile power designs |
| Low clamping voltage at high IPP | 14 V at 160 A - reduces stress on downstream DC-DC converters and load switches during surge events |
| Stable 1200 pF capacitance | Measured at 0 V, 1 MHz - enables predictable RC time constant for power-rail filtering without signal integrity impact |
| Thermal robustness | -40°C to +125°C TJ rating - supports operation in battery compartments and thermally constrained notebook chassis |
Applications
| Battery Protection | USB VBUS Line Protection |
|---|---|
Use Scenario: Protecting lithium-ion battery input terminals from ESD during assembly, testing, or user handling. IC Role / Device Role / Timing Role: Unidirectional TVS clamping positive transients to ground while blocking reverse leakage during normal charging/discharging. Use Value: Prevents gate oxide damage to battery fuel gauges and protection ICs by limiting transient voltage to ≤15.5 V at 160 A surge. | Use Scenario: Hardening USB Type-A/C VBUS pins against hot-plug ESD and induced surges in portable docking stations. IC Role / Device Role / Timing Role: Standalone TVS placed between VBUS and GND to shunt surge energy before reaching USB controller or PD interface IC. Use Value: Maintains 4.8 V VRWM margin above 5 V nominal VBUS, ensuring no conduction during steady-state operation. |
| Notebook Power Input | Mobile Device Charging Circuit |
Use Scenario: Safeguarding DC input jacks and internal PMIC rails from AC adapter surge coupling and ESD discharge. IC Role / Device Role / Timing Role: Primary surge suppressor on main 19 V or 20 V input rail, operating in parallel with bulk capacitance. Use Value: 160 A surge rating meets IEC 61000-4-5 Class 3 requirements for industrial-grade notebook adapters. | Use Scenario: Protecting charging IC inputs (e.g., BQ24296, MP2617) from ESD during cable insertion and charger swapping. IC Role / Device Role / Timing Role: Unidirectional clamp on CHG_IN rail, leveraging low 0.04 Ω dynamic resistance to minimize voltage overshoot. Use Value: Clamps to 8.5 V at 1 A surge, preserving safe operating area of integrated charge FETs and sense resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ4.5A | DO-214AC package; 4.5 V VRWM; 100 A surge rating; 1500 pF capacitance | Larger footprint (4.5 × 2.7 mm); higher parasitic inductance; suited for board-level rather than space-constrained mobile PCBs | Select SMAJ4.5A only when DFN2.0×1.25A-2L layout constraints do not apply and higher surge margin is unnecessary |
| TPD4E001DPYR | 4-channel bidirectional array; 5.5 V VRWM; 4 A IEC 61000-4-5 rating; 12 pF per channel | Designed for high-speed data lines (USB 2.0, HDMI), not power rails; insufficient for 160 A surge events | TPD4E001DPYR is unsuitable for AOZ8351DI-04's power-rail role but may complement it for data-line protection in same system |
Compared with SMAJ4.5A and TPD4E001DPYR, the AOZ8351DI-04 uniquely combines ultra-compact DFN packaging, 160 A surge capability, and 4.8 V VRWM in a unidirectional configuration-making it optimal for space-limited, high-reliability DC power rail protection where low clamping voltage and high surge endurance are jointly required.
Availability
AOZ8351DI-04 is available at Aetrix Electronics and suitable for battery protection, USB VBUS hardening, and notebook power input applications requiring stable component supply, consistent RoHS/Halogen-Free compliance, and qualified automotive-temperature-range performance.
Supply support for AOZ8351DI-04 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 in computing, consumer, and industrial markets.
The AOZ8351DI-04 belongs to AOS's Green TVS product line, engineered specifically for compact, high-surge-capacity protection of DC power rails in mobile and portable electronics where thermal and space constraints dominate design decisions.
FAQ
What is the polarity configuration of the AOZ8351DI-04?
The AOZ8351DI-04 is a unidirectional TVS diode, meaning it conducts only when the anode is more positive than the cathode by its breakdown voltage. This configuration allows it to protect positive DC rails like battery or VBUS while blocking reverse leakage during normal operation. Its pinout is Anode (Pin 1) and Cathode (Pin 2), with the cathode tied to system ground. The AOZ8351DI-04 does not conduct for negative transients on the protected line.
Does the AOZ8351DI-04 meet IEC 61000-4-5 Class 3 requirements?
Yes, the AOZ8351DI-04 is rated for ±160 A peak pulse current under IEC 61000-4-5 (8/20 µs waveform), which exceeds the 100 A minimum requirement for Class 3 surge immunity. Its clamping voltage remains below 15.5 V at full 160 A, ensuring downstream components see limited overvoltage. This makes the AOZ8351DI-04 suitable for industrial and commercial equipment where Class 3 compliance is mandated, including external power adapters and docking stations.
What is the thermal pad connection requirement for AOZ8351DI-04?
The AOZ8351DI-04 DFN2.0×1.25A-2L package includes an exposed thermal pad (EP2_S) that must be soldered to a copper pour connected to system ground for optimal thermal dissipation and surge current handling. A minimum 1.0 mm² thermal pad area with ≥4 thermal vias (0.3 mm diameter) to inner ground layers is recommended. Failure to connect the thermal pad may result in elevated junction temperature during repeated surge events and reduced long-term reliability of the AOZ8351DI-04.
Can AOZ8351DI-04 be used on a 3.3 V rail?
No, the AOZ8351DI-04 has a 4.8 V reverse working voltage (VRWM), making it unsuitable for direct use on a 3.3 V rail where normal operating voltage could approach or exceed VRWM, causing excessive leakage or premature conduction. For 3.3 V rails, a lower VRWM TVS such as AOZ8251DI-03 (3.3 V VRWM) is recommended. The AOZ8351DI-04 is intended for 5 V, battery, or higher-voltage DC rails where 4.8 V provides adequate margin.
Is AOZ8351DI-04 compatible with lead-free reflow processes?
Yes, the AOZ8351DI-04 is RoHS-compliant and qualified for standard lead-free reflow profiles, including JEDEC J-STD-020 MSL Level 1 (unlimited floor life at ≤30°C/60% RH). Its DFN2.0×1.25A-2L package supports peak reflow temperatures up to 260°C for 30 seconds. The AOZ8351DI-04 has passed preconditioning per JESD22-A113 (168 hr @ 85°C/85% RH + 3× reflow), confirming robustness in high-volume SMT manufacturing environments.
AOZ8351DI-04 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 0805 (2012 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 4.8V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 15.5V
- Current - Peak Pulse (10/1000µs):
- 160A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1200pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (2x1.25)
AOZ8351DI-04 FAQ
1.How can I place an order for AOZ8351DI-04 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8351DI-04 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 AOZ8351DI-04 reliable?
The price and inventory of AOZ8351DI-04 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8351DI-04 is usually 5 days.
3.What payment methods are accepted for AOZ8351DI-04?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8351DI-04 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8351DI-04?
AOZ8351DI-04 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8351DI-04 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 AOZ8351DI-04?
For technical support, including AOZ8351DI-04 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8351DI-04 requirements.
6.How does Aetrix verify that AOZ8351DI-04 is sourced from the original manufacturer or authorized distributors?
All AOZ8351DI-04 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 AOZ8351DI-04 meets industry standards.
7.What is the process for return or replacement of AOZ8351DI-04?
All AOZ8351DI-04 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8351DI-04, 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 AOZ8351DI-04 part is unused and in its original packaging.
Return procedure for AOZ8351DI-04:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8351DI-04 Tags
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