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Alpha & Omega Semiconductor Inc. AOZ8310DI-18
- Part No.:
- AOZ8310DI-18
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 2-UDFN
- Datasheet:
-
AOZ8310DI-18.pdf
- Description:
- TVS DIODE 18VWM 39VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,454
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Product details
Overview
AOZ8310DI-18 from Alpha and Omega Semiconductor is a unidirectional high-power TVS diode in a 1.6mm × 1.0mm DFN-2L package, designed to protect 18V power rails against IEC 61000-4-5 surges (35A, 8/20µs), ESD (±30kV contact/air), and EFT (80A). It delivers 1200W peak pulse power with clamping voltage of 35V at 35A and operates from −40°C to +125°C ambient.
For engineers reviewing the AOZ8310DI-18 datasheet, pinout, applications, or equivalent options, this device serves as a compact, high-energy transient suppressor for battery input lines, USB power buses, and industrial DC power rails where low leakage (<100nA at 18V), tight clamping, and ultra-small footprint are critical.
Technical Context
The AOZ8310DI-18 implements a single unidirectional avalanche junction optimized for fast response to 8/20µs surge transients and sub-nanosecond ESD events. Its dynamic resistance of 0.1Ω (1A–30A) ensures stable clamping behavior under high-current stress, while junction capacitance of 200pF at 1MHz supports compatibility with moderate-speed power bus applications without signal integrity compromise.
It is rated for continuous reverse working voltage (VRWM) of 18V, breakdown voltage (VBR) of 19–24V at 1mA, and clamps to ≤39V (negative polarity) / ≤35V (positive polarity) at full 35A IEC 61000-4-5 peak current - enabling robust overvoltage protection for 18V nominal systems without false triggering during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18V - maximum continuous DC voltage the device blocks without conduction; matches standard 18V power rail systems. |
| VBR (min/typ/max) | 19V / 21.5V / 24V at 1mA - defines reliable turn-on threshold for transient suppression without premature conduction. |
| IPP (8/20µs) | 35A - peak surge current it safely shunts per IEC 61000-4-5, enabling protection against severe lightning-induced transients. |
| VCL (at IPP) | 35V (positive) / −39V (negative) - clamped voltage during full 35A surge, limiting downstream voltage stress to safe levels. |
| PPP (8/20µs) | 1200W - peak pulse power handling capacity, confirming thermal survivability under short-duration high-energy events. |
| CJ (1MHz) | 200pF - junction capacitance at 0V bias, low enough to avoid loading 18V supply lines in typical industrial or portable applications. |
| IR (at VRWM) | 10–100nA - ultra-low reverse leakage ensures minimal standby power loss in battery-powered systems. |
Pinout & Package
AOZ8310DI-18 is housed in a RoHS-compliant, halogen-free 1.6mm × 1.0mm DFN-2L package with exposed pad (no thermal pad connection required). The two terminals are configured for unidirectional protection of a single line relative to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected power rail (e.g., 18V input); conducts during negative transients only. |
| Cathode | Ground reference terminal | Connected directly to system ground; establishes reference for clamping and provides return path for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30kV air and contact discharge - exceeds Level 4 requirement, eliminating need for external ESD staging in handheld and portable designs. |
| IEC 61000-4-5 surge rating | 35A (8/20µs) - enables direct protection of 18V DC inputs against induced surges per EN 61000-4-5, reducing BOM count. |
| Low dynamic resistance | 0.1Ω (1A–30A range) - minimizes voltage overshoot during fast-rising transients, improving clamping precision. |
| Ultra-small DFN-2L footprint | 1.6mm × 1.0mm - saves PCB area versus SOD-123 or SMA packages, critical for space-constrained mobile and IoT power stages. |
| −40°C to +125°C operation | Rated ambient temperature range - supports deployment in automotive cabin, industrial control, and outdoor power electronics. |
Applications
| Battery Input Protection | USB Type-C Power Delivery Bus |
|---|---|
|
Use Scenario: Protecting lithium-ion battery input circuits in portable medical devices from hot-plug transients and ESD during charging. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery terminal and PMIC input to clamp overvoltage before reaching sensitive charge management ICs. Use Value: With 18V VRWM and 35V clamping at 35A, AOZ8310DI-18 prevents latch-up or damage to 18V-rated battery fuel gauges and protection ICs during field-relevant surge events. |
Use Scenario: Safeguarding 18V auxiliary power paths in USB PD 3.0 sink applications (e.g., docking stations) against cable-discharge events and load-dump spikes. IC Role / Device Role / Timing Role: Standalone TVS on VBUS line upstream of buck converter, providing nanosecond-level response to ±30kV ESD and 8/20µs surges. Use Value: 200pF capacitance avoids signal integrity issues on 18V PD lines, while 1200W PPP ensures survival of repeated 35A surges without degradation. |
| Industrial 18V DC Power Rail | Automotive Body Control Module (BCM) Supply |
|
Use Scenario: Securing 18V logic supply rails in programmable logic controllers (PLCs) exposed to inductive switching noise and long-cable surges. IC Role / Device Role / Timing Role: Primary surge suppressor on 18V input stage, coordinated with upstream fuse and downstream LDO to form layered protection. Use Value: 35A IEC 61000-4-5 rating and −40°C to +125°C operation ensure reliability across factory environments with wide ambient swings and repetitive transients. |
Use Scenario: Protecting 18V auxiliary supply inputs in BCMs from load-dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: First-line TVS on 18V battery feed, absorbing energy before it reaches microcontroller power domains and CAN transceivers. Use Value: Clamping voltage ≤39V at −35A ensures downstream 24V-tolerant regulators remain within safe operating area during worst-case negative transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | DO-214AC package (4.5mm × 2.7mm), 400W PPP, 38.9V clamping at 32.4A | Larger footprint, lower surge rating, higher clamping voltage - suitable only for less demanding 18V rail protection. | Choose SMAJ18A only if board space permits larger package and 1200W surge margin is not required. |
| TPD1E05U06DPYR | 0.65mm × 0.65mm X2SON-2, 5V VRWM, 120W PPP, ±30kV ESD only - no IEC 61000-4-5 surge rating | Designed exclusively for ESD, not surge; incompatible with 18V systems due to low VRWM. | TPD1E05U06DPYR is unsuitable for AOZ8310DI-18's 18V surge protection role; use only for low-voltage signal-line ESD. |
Compared with SMAJ18A and TPD1E05U06DPYR, AOZ8310DI-18 uniquely combines 18V VRWM, 1200W surge capability, and 1.6mm × 1.0mm footprint - making it the only viable option for space-constrained, high-energy 18V rail protection where both ESD and IEC 61000-4-5 compliance are mandatory.
Availability
AOZ8310DI-18 is available at Aetrix Electronics and suitable for battery protection, USB power delivery bus design, and industrial 18V DC power rail applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for AOZ8310DI-18 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 high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The AOZ8310DI series was developed to deliver high-power, ultra-compact transient protection for modern DC power rails - addressing demand for smaller footprints, higher surge ratings, and broader temperature operation than legacy TVS solutions.
FAQ
What is the maximum continuous reverse working voltage for AOZ8310DI-18?
The AOZ8310DI-18 has a guaranteed reverse working voltage (VRWM) of 18V, meaning it reliably blocks up to 18V DC in normal operation without significant leakage. This value is confirmed in the Electrical Characteristics table on page 6 of the Rev. 3.0 datasheet, with IR ≤100nA at 18V and TA = 25°C. AOZ8310DI-18 must not be used on rails exceeding 18V nominal to avoid premature conduction.
Does AOZ8310DI-18 meet IEC 61000-4-5 surge immunity requirements?
Yes, AOZ8310DI-18 is rated for IEC 61000-4-5 (8/20µs) with a peak pulse current (IPP) of 35A and peak pulse power (PPP) of 1200W. These values are specified in the Absolute Maximum Ratings and Electrical Characteristics sections (pages 2 and 6), and the device is explicitly described in the General Description as "IEC 61000-4-5 8/20µs 22–85A" across the family, with AOZ8310DI-18 validated at 35A.
What is the clamping voltage of AOZ8310DI-18 at its rated 35A surge current?
At 35A (8/20µs), AOZ8310DI-18 clamps to a maximum of 35V for positive polarity and −39V for negative polarity, as specified in the "Clamping Voltage" row under AOZ8310DI-18 on page 6. This ensures downstream 18V-rated components experience no more than ~2× nominal voltage during worst-case surge events, preserving functional safety margins.
Is AOZ8310DI-18 suitable for automotive applications?
AOZ8310DI-18 is rated for −40°C to +125°C ambient operation and meets IEC 61000-4-2 (±30kV), IEC 61000-4-4 (80A EFT), and IEC 61000-4-5 (35A surge), making it suitable for non-safety-critical automotive subsystems such as body control modules, infotainment power rails, and lighting drivers. However, AOS explicitly prohibits use in life-support or safety-critical automotive systems per its Life Support Policy on page 9.
What package type and dimensions does AOZ8310DI-18 use?
AOZ8310DI-18 uses a DFN-2L package measuring 1.6mm × 1.0mm with 0.5mm pitch, as stated in the Ordering Information table (page 2) and Pin Configuration diagram (page 1). The package is RoHS-compliant and halogen-free, and features two terminals: Anode and Cathode - no thermal pad or additional pins are present.
AOZ8310DI-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 2-UDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V (Max)
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 35A (8/20µs)
- Power - Peak Pulse:
- 1200W (1.2kW)
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 200pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1.6x1)
AOZ8310DI-18 FAQ
1.How can I place an order for AOZ8310DI-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8310DI-18 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 AOZ8310DI-18 reliable?
The price and inventory of AOZ8310DI-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8310DI-18 is usually 5 days.
3.What payment methods are accepted for AOZ8310DI-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8310DI-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8310DI-18?
AOZ8310DI-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8310DI-18 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 AOZ8310DI-18?
For technical support, including AOZ8310DI-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8310DI-18 requirements.
6.How does Aetrix verify that AOZ8310DI-18 is sourced from the original manufacturer or authorized distributors?
All AOZ8310DI-18 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 AOZ8310DI-18 meets industry standards.
7.What is the process for return or replacement of AOZ8310DI-18?
All AOZ8310DI-18 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8310DI-18, 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 AOZ8310DI-18 part is unused and in its original packaging.
Return procedure for AOZ8310DI-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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