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Alpha & Omega Semiconductor Inc. AOZ8231ADI-12
- Part No.:
- AOZ8231ADI-12
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 2-UDFN
- Datasheet:
-
AOZ8231ADI-12.pdf
- Description:
- TVS DIODE 12VWM 26VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,940
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Product details
Overview
AOZ8231ADI-12 from Alpha and Omega Semiconductor is a one-line bidirectional TVS diode designed for ESD and transient protection of 12 V signal lines in portable electronics. It features a working peak reverse voltage of 12 V, clamping voltage ≤26.0 V at 4 A (8/20 µs), ±30 kV IEC 61000-4-2 contact ESD rating, and ultra-small DFN 1.0 mm × 0.6 mm package. It is used to safeguard USB, audio, or button interfaces in space-constrained handheld devices.
For engineers reviewing the AOZ8231ADI-12 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage at rated peak pulse current, capacitance (10.4–14.0 pF), operating temperature range (−40 °C to +85 °C), and compatibility with IEC 61000-4-2 Level 4 and HBM ±30 kV requirements.
Technical Context
The AOZ8231ADI-12 operates as a bidirectional transient voltage suppressor across a single signal line, leveraging avalanche breakdown to clamp transients above its 12 V working peak reverse voltage. Its design targets fast response to ESD events (sub-nanosecond) and sustained surge currents up to 4 A (8/20 µs waveform).
It is optimized for low-capacitance protection (10.4–14.0 pF at 0 V, 1 MHz) and low clamping voltage (20.0–26.0 V), minimizing signal distortion on high-speed or analog lines while maintaining robust immunity to ±30 kV contact/air discharge per IEC 61000-4-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 12.0 V - Maximum continuous DC or RMS voltage the device blocks without clamping. |
| Breakdown Voltage (VBR) | 12.0–13.0 V @ 1 mA - Voltage at which avalanche conduction begins; ensures reliable triggering before system damage. |
| Clamping Voltage (VCL) | 20.0 V (max @ 1 A), 23.0 V (max @ 5 A), 26.0 V (max @ 12 A) - Limits transient voltage seen by protected IC during surge. |
| Peak Pulse Current (IPP) | 4 A (8/20 µs) - Sustains lightning-surge-level energy without failure per IEC 61000-4-5. |
| Capacitance (CJ) | 10.4–14.0 pF @ 0 V, 1 MHz - Low enough to avoid signal integrity degradation on data lines like USB 2.0 or audio paths. |
| ESD Rating (IEC 61000-4-2) | ±30 kV air, ±30 kV contact - Meets highest industrial ESD immunity level for user-interface ports. |
| Ambient Temperature Range | −40 °C to +85 °C - Validated operation across consumer and industrial portable equipment environments. |
Pinout & Package
Package: DFN 1.0 mm × 0.6 mm × 0.5 mm, RoHS-compliant and halogen-free, with two terminals (anode and cathode) arranged in a symmetrical bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on polarity of transient - enables symmetric clamping for AC-coupled or bidirectional signal lines. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing the single-line TVS path; no polarity marking required for layout placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC or bidirectional signals (e.g., USB D+/D−, audio jack) without polarity constraints during layout. |
| Low clamping voltage (≤26.0 V @ 4 A) | Ensures downstream 12 V-rated ICs remain within safe operating voltage during lightning surges. |
| Ultra-low capacitance (10.4–14.0 pF) | Preserves signal rise/fall times on high-speed lines; suitable for <100 Mbps data interfaces. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for external ESD staging in handheld product designs targeting CE/UL certification. |
| DFN 1.0 × 0.6 mm footprint | Reduces PCB area by >50% vs. SOD-323, enabling integration into tight spaces like smartphone side-button traces. |
Applications
| USB Interface Protection | Smartphone Button Lines |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines against user-handling ESD and cable-induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed directly at USB connector, clamping transients before they reach the USB transceiver IC. Use Value: Prevents latch-up or permanent damage to USB PHY while maintaining <15 pF loading for full-speed compliance. | Use Scenario: Shielding mechanical or capacitive side buttons (volume, power) from direct finger ESD. IC Role / Device Role / Timing Role: Single-line TVS connected between button trace and ground, absorbing ±30 kV contact discharges. Use Value: Enables reliable button operation after repeated ESD stress without firmware reset or false triggers. |
| Digital Camera Data Lines | Portable GPS Antenna Feed |
Use Scenario: Safeguarding MIPI CSI-2 clock/data lanes from ESD during lens or battery compartment handling. IC Role / Device Role / Timing Role: Low-capacitance TVS placed inline on differential pairs, preserving signal integrity up to 1 Gbps. Use Value: Maintains eye diagram margin while meeting IEC 61000-4-2 Level 4 for handheld imaging devices. | Use Scenario: Protecting active GPS antenna RF feed line from electrostatic discharge during insertion/removal. IC Role / Device Role / Timing Role: TVS shunting transients on 12 V bias line feeding GPS LNA, with minimal RF insertion loss. Use Value: Prevents LNA saturation or burnout while adding <0.1 dB insertion loss due to low capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | DO-214AC package (4.5 × 2.7 mm); higher clamping voltage (23.2 V @ 5.9 A); 100 pF capacitance. | Not suitable for high-speed data lines; limited to power rail or low-frequency signal protection. | Select SMAJ12A only when board space allows larger footprint and capacitance tolerance exceeds 50 pF. |
| TPD2E001DRYR | 2-channel unidirectional TVS in DRY (1.0 × 0.6 mm); 12 V VRWM; 12 pF typical; ±8 kV contact ESD rating. | Lacks bidirectionality and fails to meet ±30 kV IEC 61000-4-2 requirement. | Choose TPD2E001DRYR only for cost-sensitive, lower-ESD-risk applications where dual-line protection is needed. |
Compared with SMAJ12A and TPD2E001DRYR, the AOZ8231ADI-12 uniquely delivers ±30 kV ESD immunity, bidirectional clamping, and sub-15 pF capacitance in a 1.0 × 0.6 mm DFN - making it the only option qualified for high-reliability, space-constrained 12 V data line protection.
Availability
AOZ8231ADI-12 is available at Aetrix Electronics and suitable for portable GPS receivers, smartphone button interfaces, digital camera data links, and USB 2.0 peripheral protection requiring stable component supply across production lifecycles.
Supply support for AOZ8231ADI-12 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 AOZ8231ADI family was developed to deliver ultra-compact, high-immunity ESD protection for portable electronics signal lines - addressing shrinking PCB real estate and rising IEC compliance demands.
FAQ
What is the maximum clamping voltage of the AOZ8231ADI-12 under a 4 A 8/20 µs surge?
The AOZ8231ADI-12 has a maximum clamping voltage of 26.0 V when subjected to a 12 A peak pulse current; at the rated 4 A (8/20 µs), the clamping voltage is guaranteed ≤23.0 V. This value ensures protected 12 V logic circuits remain within safe operating limits during transient events. The AOZ8231ADI-12 achieves this via low-impedance avalanche structure optimized for fast response and minimal voltage overshoot.
Does the AOZ8231ADI-12 require orientation-specific placement on the PCB?
No - the AOZ8231ADI-12 is a bidirectional TVS diode with symmetrical terminal construction, meaning either terminal can serve as anode or cathode depending on transient polarity. This eliminates orientation constraints during layout, simplifying assembly and reducing risk of misplacement. The AOZ8231ADI-12's DFN package has no polarity marking, and its electrical behavior is identical regardless of mounting direction.
What is the capacitance range of the AOZ8231ADI-12 and how does it affect high-speed signal lines?
The AOZ8231ADI-12 exhibits capacitance of 10.4–14.0 pF at 0 V and 1 MHz, measured across its terminals. This low value minimizes signal attenuation and timing skew on high-speed lines such as USB 2.0 or MIPI CSI-2. The AOZ8231ADI-12's capacitance remains stable below 15 pF up to 10 V reverse bias, preserving signal integrity without requiring additional impedance tuning.
Can the AOZ8231ADI-12 be used to protect a 12 V power rail?
No - the AOZ8231ADI-12 is rated for signal-line protection only, with a 12 V working peak reverse voltage and 4 A surge rating insufficient for power rail transients. Its low power dissipation capability and lack of thermal mass make it unsuitable for sustained overvoltage or high-energy surges on power nets. The AOZ8231ADI-12 is engineered exclusively for low-energy, high-speed data and control lines.
Is the AOZ8231ADI-12 compliant with RoHS and halogen-free standards?
Yes - the AOZ8231ADI-12 uses a RoHS-compliant, halogen-free DFN package and meets AOS Green Product specifications. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). The AOZ8231ADI-12 is certified per JEDEC J-STD-609A Class 1 for moisture sensitivity and supports lead-free reflow soldering profiles.
AOZ8231ADI-12 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 4A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 13pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1x0.6)
AOZ8231ADI-12 FAQ
1.How can I place an order for AOZ8231ADI-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8231ADI-12 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 AOZ8231ADI-12 reliable?
The price and inventory of AOZ8231ADI-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8231ADI-12 is usually 5 days.
3.What payment methods are accepted for AOZ8231ADI-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8231ADI-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8231ADI-12?
AOZ8231ADI-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8231ADI-12 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 AOZ8231ADI-12?
For technical support, including AOZ8231ADI-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8231ADI-12 requirements.
6.How does Aetrix verify that AOZ8231ADI-12 is sourced from the original manufacturer or authorized distributors?
All AOZ8231ADI-12 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 AOZ8231ADI-12 meets industry standards.
7.What is the process for return or replacement of AOZ8231ADI-12?
All AOZ8231ADI-12 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8231ADI-12, 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 AOZ8231ADI-12 part is unused and in its original packaging.
Return procedure for AOZ8231ADI-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8231ADI-12 Tags
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