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Alpha & Omega Semiconductor Inc. AOZ8621UNI-15
- Part No.:
- AOZ8621UNI-15
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 3-PowerUDFN
- Datasheet:
-
AOZ8621UNI-15.pdf
- Description:
- 1CH 15V UNIDIRECTIONAL HIGH SURG
- Quantity:
- Payment:
- Shipping:
Inventory:5,832
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Product details
Overview
AOZ8621UNI-15 from Alpha and Omega Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary-side power rail protection in battery and VBUS lines. It features 15 V maximum reverse working voltage (VRWM), ±30 kV IEC 61000-4-2 ESD rating, 140 A peak pulse current (IPP), 21 V clamping voltage at 1 A, and operates from −40°C to +125°C junction temperature.
For engineers reviewing the AOZ8621UNI-15 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN2×2-3L package mapping, real-world clamping behavior, and validated alternatives for mobile power rail surge protection design.
Technical Context
The AOZ8621UNI-15 implements a single unidirectional silicon avalanche diode structure optimized for fast response to ESD and lightning-induced transients on DC power lines. Its low dynamic resistance (0.04 Ω) and tight VBR tolerance (16.5–19.5 V) ensure consistent clamping under 8/20 μs surge conditions up to 3800 W peak pulse power.
This device operates exclusively in reverse-biased mode during overvoltage events, shunting surge current to ground while maintaining low leakage (<10 nA at 15 V) during normal operation. It is not intended for bidirectional signal line protection or AC applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse voltage before conduction; sets operating margin for 12–15 V power rails. |
| VBR (min/max) | 16.5 V / 19.5 V - Breakdown initiates within this range at 1 mA; defines turn-on threshold consistency. |
| VCL @ 1 A | 21 V - Clamped voltage during low-current surge; critical for downstream IC overvoltage margin. |
| VCL @ IPP | 28 V - Clamped voltage at rated 140 A surge; determines worst-case stress on protected circuitry. |
| IPP | 140 A - Peak 8/20 μs surge current it safely diverts without failure; supports IEC 61000-4-5 Level 4. |
| CJ @ 1 MHz | 880 pF - Junction capacitance at zero bias; low enough for VBUS protection without signal integrity impact. |
| Dynamic R | 0.04 Ω - Low impedance during clamping; minimizes voltage overshoot during high di/dt events. |
Pinout & Package
AOZ8621UNI-15 is housed in a RoHS-compliant, halogen-free DFN2.0×2.0-3L package (2.0 mm × 2.0 mm × 0.55 mm), with exposed thermal pad for enhanced power dissipation. The package is rated for −40°C to +125°C junction temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to protected power rail (e.g., VBUS or battery+); reverse-biased during surge. |
| 2 | Cathode | Connected to system ground; provides low-impedance path for transient current during clamping. |
| 3 | Thermal Pad (EP) | Exposed copper pad on bottom surface; must be soldered to PCB ground plane for thermal management and ESD return path. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact/air - Enables direct integration into USB-C, battery charging, and portable device interfaces without external shielding. |
| Low clamping voltage (21 V @ 1 A) | Provides ≥3 V headroom for 15 V nominal rails - protects downstream PMICs and load switches rated to 24 V absolute max. |
| High surge current rating (140 A) | Meets IEC 61000-4-5 Level 4 (2 kV line-to-ground) - suitable for industrial-grade USB PD adapters and automotive accessory ports. |
| Low leakage current (<10 nA @ VRWM) | Minimizes standby power loss in always-on battery systems - critical for multi-week shelf life in IoT sensors and wearables. |
| DFN2×2-3L footprint | Enables compact placement near connectors - reduces trace inductance and improves high-frequency surge suppression efficacy. |
Applications
| Battery Protection | USB VBUS Line Protection |
|---|---|
Use Scenario: Protecting lithium-ion battery input terminals from ESD during hot-plug insertion of chargers or accessories. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery+ and system ground to clamp transients before reaching battery protection IC. Use Value: Prevents false overvoltage trips and gate oxide damage in battery fuel gauges and charge controllers by limiting surge voltage to ≤28 V at 140 A. | Use Scenario: Safeguarding USB Type-C VBUS pins against electrostatic discharge during cable mating and lightning-induced surges in host devices. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on VBUS rail, positioned upstream of USB PD controller and load switch. Use Value: Maintains VBUS integrity below 28 V during 8/20 μs surges, ensuring uninterrupted power negotiation and preventing brownout resets in PD-enabled laptops. |
| Notebook Power Input | Mobile Phone Charging Circuit |
Use Scenario: Securing DC input jacks on ultrabooks against surge events from wall adapters or docking stations. IC Role / Device Role / Timing Role: Standalone unidirectional TVS integrated into 12–20 V input stage to absorb energy before buck converter input capacitors. Use Value: Eliminates need for secondary TVS stages by sustaining 3800 W peak pulse power, reducing BOM count and board area. | Use Scenario: Protecting fast-charging circuits (e.g., Qualcomm Quick Charge, USB PD 3.0) from ESD during cable insertion and removal. IC Role / Device Role / Timing Role: First-line defense on VBUS path between USB connector and charging IC, operating in reverse-bias conduction mode. Use Value: Achieves <10 nA leakage at 15 V VRWM, preserving battery runtime in standby without compromising surge robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | DO-214AC package (4.5×2.7 mm), higher VCL (33.2 V @ 14.3 A), lower IPP (14.3 A), 10× larger footprint. | Designed for board-level surge protection where space is not constrained; unsuitable for ultra-thin mobile PCBs. | Select SMAJ15A only when thermal mass requirements exceed DFN2×2 limits or legacy through-hole compatibility is needed. |
| TPD4E001DPYR | Quad-channel, bidirectional, 5.5 V VRWM, 3.5 pF CJ, rated for ±12 kV ESD - not a 1-channel unidirectional replacement. | Targeted at high-speed data lines (USB 2.0, HDMI), not power rail protection; cannot handle 140 A surge current. | TPD4E001DPYR is incompatible with AOZ8621UNI-15's power rail role; use only for signal-line ESD, never as direct substitute. |
Compared with SMAJ15A and TPD4E001DPYR, AOZ8621UNI-15 uniquely combines 140 A surge capability, 21 V low-clamp performance, and 2×2 mm DFN packaging-enabling high-power rail protection in space-constrained mobile designs where neither alternative meets all three criteria simultaneously.
Availability
AOZ8621UNI-15 is available at Aetrix Electronics and suitable for battery protection, USB VBUS line hardening, and notebook power input applications requiring stable component supply across consumer electronics and industrial embedded programs.
Supply support for AOZ8621UNI-15 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 AOZ8621UNI series was developed specifically for high-surge, low-clamp protection of DC power rails in portable electronics, addressing the need for compact, high-reliability TVS solutions in USB-C, battery, and adapter interfaces.
FAQ
What is the maximum clamping voltage of AOZ8621UNI-15 during a full-rated surge event?
The AOZ8621UNI-15 clamps to 28 V at its rated 140 A peak pulse current (8/20 μs waveform). This value is guaranteed per the Electrical Characteristics table on page 3 of Rev. 2.1 datasheet and reflects worst-case voltage seen by downstream components during IEC 61000-4-5 Level 4 compliance testing. The AOZ8621UNI-15 maintains this clamping performance across its full operating temperature range.
Can AOZ8621UNI-15 be used for bidirectional signal line protection such as USB data lines?
No. The AOZ8621UNI-15 is a unidirectional TVS diode intended solely for DC power rail protection (e.g., battery+, VBUS). It lacks symmetrical breakdown characteristics required for bidirectional data line protection. Using AOZ8621UNI-15 on differential signal pairs would cause DC bias disruption and signal integrity failure. For USB 2.0/3.x data lines, AOS recommends dedicated low-capacitance bidirectional arrays like AOZ8804DI.
What is the recommended PCB layout practice for the thermal pad of AOZ8621UNI-15?
The exposed thermal pad (Pin 3) of AOZ8621UNI-15 must be soldered to a minimum 10 mm² copper pour connected directly to the system ground plane using at least four 0.3 mm diameter thermal vias. This ensures effective heat dissipation during surge events and establishes a low-inductance ESD return path. Failure to properly land the thermal pad risks thermal runaway and premature failure under repeated 140 A surges.
Does AOZ8621UNI-15 meet automotive AEC-Q200 requirements?
No. AOZ8621UNI-15 is not AEC-Q200 qualified. While it operates from −40°C to +125°C junction temperature, it has not undergone the full stress test suite (including temperature cycling, humidity bias, and mechanical shock) required for automotive qualification. For AEC-Q200-compliant TVS diodes, consider AOS's AOZ8621Q series or Vishay's SMAJ15AQ series.
How does the leakage current of AOZ8621UNI-15 compare to other 15 V TVS diodes in DFN packages?
At 25°C and 15 V reverse bias, AOZ8621UNI-15 exhibits ≤10 nA leakage current - among the lowest in its class. Competing DFN-packaged 15 V TVS diodes (e.g., ON Semi's NSP1501MUTAG) typically specify ≤50 nA. This ultra-low leakage extends battery shelf life in always-connected IoT and wearable devices, making AOZ8621UNI-15 especially valuable where standby current budgets are sub-100 nA.
AOZ8621UNI-15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 3-PowerUDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.5V
- Voltage - Clamping (Max) @ Ipp:
- 28V
- Current - Peak Pulse (10/1000µs):
- 140A (8/20µs)
- Power - Peak Pulse:
- 3800W (3.8kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 880pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-DFN (2x2)
AOZ8621UNI-15 FAQ
1.How can I place an order for AOZ8621UNI-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8621UNI-15 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 AOZ8621UNI-15 reliable?
The price and inventory of AOZ8621UNI-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8621UNI-15 is usually 5 days.
3.What payment methods are accepted for AOZ8621UNI-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8621UNI-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8621UNI-15?
AOZ8621UNI-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8621UNI-15 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 AOZ8621UNI-15?
For technical support, including AOZ8621UNI-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8621UNI-15 requirements.
6.How does Aetrix verify that AOZ8621UNI-15 is sourced from the original manufacturer or authorized distributors?
All AOZ8621UNI-15 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 AOZ8621UNI-15 meets industry standards.
7.What is the process for return or replacement of AOZ8621UNI-15?
All AOZ8621UNI-15 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8621UNI-15, 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 AOZ8621UNI-15 part is unused and in its original packaging.
Return procedure for AOZ8621UNI-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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