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Alpha & Omega Semiconductor Inc. AOZ8231ADI-24
- Part No.:
- AOZ8231ADI-24
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 2-UDFN
- Datasheet:
-
AOZ8231ADI-24.pdf
- Description:
- TVS DIODE 24VWM 39VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,151
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Product details
Overview
AOZ8231ADI-24 from Alpha and Omega Semiconductor is a one-line bidirectional TVS diode designed to protect voltage-sensitive electronics against ESD and transient surges. It features a 24 V working peak reverse voltage (VRWM), clamps at ≤39.0 V under 2.5 A 8/20 µs surge current, delivers ±15 kV contact/±18 kV air ESD protection per IEC 61000-4-2, and is housed in a RoHS-compliant, halogen-free DFN 1.0 mm × 0.6 mm package for space-constrained portable data lines.
For engineers reviewing the AOZ8231ADI-24 datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V VRWM rating, low 9.6–15.0 pF capacitance at 0 V, 2.5 A IEC 61000-4-5 lightning surge capability, and suitability for high-speed signal line protection in compact consumer electronics where board area and signal integrity are critical.
Technical Context
The AOZ8231ADI-24 operates as a bidirectional clamping device across a single signal line, leveraging avalanche breakdown to divert transients before they reach downstream ICs. Its symmetrical structure enables protection against both positive and negative polarity surges without polarity dependency.
It is characterized for operation from −40 °C to +85 °C ambient, with a junction temperature range up to +125 °C. The device exhibits low leakage (<0.1 µA at VRWM) and maintains stable clamping performance across its rated pulse current range, supporting robust immunity to EFT (40 A), ESD (IEC 61000-4-2), and lightning surges (2.5 A, 8/20 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected signal line DC bias. |
| VBR (min @ 1 mA) | 27.0 V - Breakdown initiates reliably above this threshold, ensuring no premature conduction during normal operation. |
| VCL (max @ 2.5 A) | 39.0 V - Peak clamped voltage during 8/20 µs lightning surge; defines worst-case overvoltage seen by protected IC. |
| CJ (0 V, 1 MHz) | 9.6–15.0 pF - Low, frequency-stable capacitance minimizes signal distortion on high-speed lines like USB or audio interfaces. |
| ESD Contact/Air | ±15 kV / ±18 kV - Exceeds IEC 61000-4-2 Level 4, enabling compliance in handheld devices subject to frequent human handling. |
| IEC 61000-4-5 | 2.5 A (8/20 µs) - Sustains standardized lightning-induced surge currents without degradation or failure. |
| Package | DFN 1.0 mm × 0.6 mm × 0.5 mm - Ultra-compact footprint saves PCB real estate in thin, portable form factors. |
Pinout & Package
AOZ8231ADI-24 is packaged in a 2-terminal DFN 1.0 mm × 0.6 mm outline with exposed pad (no thermal pad connection required). The device has no internal ground or control pins-both terminals serve as symmetrical, bidirectional signal path connections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal accepts positive or negative surge; no polarity marking required-simplifies layout and eliminates orientation errors. |
| Exposed Pad | Thermal & mechanical anchor | Not electrically connected; improves solder joint reliability and heat dissipation during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential signal lines (e.g., USB D+/D−, audio inputs) without requiring separate unidirectional devices. |
| Low clamping voltage (≤39.0 V) | Ensures downstream 24 V-rated ICs remain within safe absolute maximum ratings during surge events. |
| Low capacitance (9.6–15.0 pF) | Preserves signal rise/fall times and impedance integrity on data lines up to ~100 MHz. |
| RoHS/halogen-free DFN package | Meets global environmental compliance requirements while enabling automated reflow assembly in high-volume production. |
Applications
| USB Data Lines | Industrial Sensor Inputs |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines in portable GPS units against ESD from user finger contact and cable coupling. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed directly at connector entry point to shunt ESD energy before it reaches USB transceiver IC. Use Value: Prevents lockup or damage to USB PHY with <15 pF loading and clamping below 39 V-maintaining full-speed signaling integrity. | Use Scenario: Shielding 24 V analog sensor outputs (e.g., pressure transducers) from induced surges in factory automation wiring harnesses. IC Role / Device Role / Timing Role: Line protector on signal output path, absorbing 2.5 A lightning surges per IEC 61000-4-5 without affecting DC offset or gain accuracy. Use Value: Enables reliable long-term operation in harsh industrial environments where 24 V supply rails are common and surge exposure is frequent. |
| MP3 Player Audio Jacks | Notebook Keyboard Interfaces |
Use Scenario: Guarding 3.5 mm audio jack tip/ring contacts in MP3 players against repeated ESD events during headphone insertion/removal. IC Role / Device Role / Timing Role: Low-capacitance ESD clamp on unbalanced audio paths, preserving wideband frequency response and minimizing noise injection. Use Value: Delivers ±18 kV air discharge protection while adding <15 pF parasitic load-critical for maintaining >20 kHz audio fidelity. | Use Scenario: Securing matrix-scanned keyboard scan lines in ultrabooks against ESD from user fingertip contact on metal keys or chassis. IC Role / Device Role / Timing Role: Point-of-entry TVS on each row/column line, leveraging bidirectional symmetry to handle arbitrary contact polarity. Use Value: Eliminates false keypresses and microcontroller resets with fast response (<1 ns) and low leakage (<0.1 µA) during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | DO-214AC package (4.5 mm × 2.7 mm); 24 V VRWM; 38.9 V VCL @ 5.2 A; 100 pF typical capacitance. | Higher capacitance and larger footprint limit use on high-speed or space-constrained lines. | Select SMAJ24A only when surge current requirement exceeds 2.5 A and PCB area permits larger package. |
| SP1002-24 | SOD-323 package (1.7 mm × 1.3 mm); 24 V VRWM; 38.9 V VCL @ 2.5 A; 15 pF typical capacitance. | Slightly larger footprint than AOZ8231ADI-24 but identical electrical specs; not RoHS/halogen-free certified per datasheet. | Choose SP1002-24 if legacy qualification requires SOD-323 form factor and halogen-free compliance is not mandated. |
Compared with SMAJ24A and SP1002-24, the AOZ8231ADI-24 uniquely combines ultra-small DFN size (1.0 × 0.6 mm), guaranteed low capacitance (≤15 pF), and full RoHS/halogen-free compliance-making it optimal for next-generation portable electronics where miniaturization and regulatory alignment are non-negotiable.
Availability
AOZ8231ADI-24 is available at Aetrix Electronics and suitable for USB data protection, industrial 24 V sensor interfaces, MP3 player audio jacks, and notebook keyboard scan lines requiring stable component supply and consistent ESD immunity performance.
Supply support for AOZ8231ADI-24 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 consumer, computing, and industrial markets.
The AOZ8231ADI family was developed to deliver ultra-compact, high-performance ESD protection for high-speed signal lines in space-constrained portable electronics-balancing low capacitance, precise clamping, and environmental compliance.
FAQ
What is the maximum clamping voltage of AOZ8231ADI-24 under surge conditions?
The AOZ8231ADI-24 has a maximum clamping voltage (VCL) of 39.0 V when subjected to a 2.5 A, 8/20 µs lightning surge current. This value is specified at the peak of the transient and ensures protected downstream components-such as 24 V-rated interface ICs-remain within their absolute maximum voltage limits during surge events. The clamping behavior is verified per IEC 61000-4-5 test conditions.
Does AOZ8231ADI-24 require polarity-aware placement on the PCB?
No, AOZ8231ADI-24 does not require polarity-aware placement. As a bidirectional TVS diode, its symmetrical internal structure allows either terminal to serve as anode or cathode depending on surge polarity. This eliminates orientation errors during automated assembly and simplifies layout for AC-coupled or differential signal lines such as USB or audio paths.
What is the capacitance range of AOZ8231ADI-24 and how does it affect high-speed signals?
The AOZ8231ADI-24 exhibits a capacitance range of 9.6 pF (typical) to 15.0 pF (maximum) at 0 V and 1 MHz. This low, tightly controlled capacitance minimizes signal attenuation and timing skew on high-speed lines-including USB 2.0 and analog audio-preserving signal integrity up to ~100 MHz without requiring compensation or equalization in the host design.
Is AOZ8231ADI-24 compliant with RoHS and halogen-free standards?
Yes, AOZ8231ADI-24 is fully RoHS compliant and halogen-free per AOS Green Product policy. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and meets JEDEC JS709B and IPC-1752A requirements for halogen content (<900 ppm bromine, <900 ppm chlorine). This supports global environmental compliance and lead-free reflow processing.
What ambient temperature range is AOZ8231ADI-24 rated for?
AOZ8231ADI-24 is rated for continuous operation across an ambient temperature range of −40 °C to +85 °C. Its junction temperature can reach up to +125 °C under surge conditions, and storage temperature extends from −65 °C to +150 °C. These ratings ensure reliable performance in portable consumer devices exposed to varying environmental conditions-from cold outdoor use to warm indoor charging scenarios.
AOZ8231ADI-24 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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 29V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 2.5A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 12pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1x0.6)
AOZ8231ADI-24 FAQ
1.How can I place an order for AOZ8231ADI-24 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8231ADI-24 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-24 reliable?
The price and inventory of AOZ8231ADI-24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8231ADI-24 is usually 5 days.
3.What payment methods are accepted for AOZ8231ADI-24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8231ADI-24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8231ADI-24?
AOZ8231ADI-24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8231ADI-24 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-24?
For technical support, including AOZ8231ADI-24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8231ADI-24 requirements.
6.How does Aetrix verify that AOZ8231ADI-24 is sourced from the original manufacturer or authorized distributors?
All AOZ8231ADI-24 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-24 meets industry standards.
7.What is the process for return or replacement of AOZ8231ADI-24?
All AOZ8231ADI-24 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8231ADI-24, 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-24 part is unused and in its original packaging.
Return procedure for AOZ8231ADI-24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8231ADI-24 Tags
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