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Alpha & Omega Semiconductor Inc. AOZ8302ACI-12
- Part No.:
- AOZ8302ACI-12
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AOZ8302ACI-12.pdf
- Description:
- TVS DIODE 12VWM 27VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,703
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Product details
Overview
AOZ8302ACI-12 from Alpha and Omega Semiconductor is a dual-line, bidirectional transient voltage suppression (TVS) diode in SOT23-3L package, rated for 12V reverse working voltage, 24A IEC 61000-4-5 peak pulse current, ±30kV ESD contact/air immunity, and 20pF junction capacitance. It protects Ethernet and telecom interface lines against lightning surges and electrostatic discharge.
For engineers reviewing the AOZ8302ACI-12 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 27V at −24A, low dynamic resistance (0.1Ω), bidirectional operation, and RoHS-compliant SOT23-3L footprint for space-constrained datacom layouts.
Technical Context
The AOZ8302ACI-12 integrates two independent, symmetrical TVS diodes in a single SOT23-3L package with pins 1 and 3 as protected I/O lines and pin 2 as common cathode/anode reference. Its bidirectional clamping architecture delivers matched positive/negative VCL performance: 19V/−4.5V at 30A TLP and 23V/−5V at 24A (8/20µs).
Designed for IEC 61000-4-2 Level 4 and IEC 61000-4-5 compliance, it sustains 12V VRWM with 13V minimum breakdown, <1µA leakage at 12V, and 0.85V forward voltage at 15mA - enabling low-loss protection without signal distortion in high-speed interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12V reverse working voltage - sets maximum continuous operating voltage before conduction begins |
| VBR (min) | 13V breakdown at 1mA - ensures reliable turn-on during transients above system rail |
| VCL (max, +24A) | 27V clamping at 24A 8/20µs surge - limits downstream IC stress to safe voltage margin |
| VCL (max, −24A) | −7V clamping at −24A 8/20µs surge - maintains symmetric protection for AC-coupled lines |
| CJ | 20pF at 0V - minimizes signal integrity impact on 100BASE-TX and USB 2.0 data paths |
| RDNY | 0.1Ω dynamic resistance - enables fast, low-voltage overshoot suppression during fast-rising transients |
| ESD Rating | ±30kV contact & air per IEC 61000-4-2 - exceeds Level 4 immunity for handheld and field-deployed equipment |
Pinout & Package
SOT23-3L package: surface-mount, gull-wing leads, 1.3mm × 2.9mm × 1.1mm body, RoHS-compliant, rated for −40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O Line 1 Anode/Cathode | Bidirectional terminal for first protected signal line (e.g., ETH_MDIO or RS-485 A) |
| 2 | Common Reference | Shared cathode connection for both TVS diodes - ties to system ground or local reference plane |
| 3 | I/O Line 2 Anode/Cathode | Bidirectional terminal for second protected signal line (e.g., ETH_MDC or RS-485 B) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line bidirectional TVS | Single SOT23-3L device protects two independent signal paths with matched clamping in both polarities |
| Low clamping voltage asymmetry | +23V / −5V at 24A (8/20µs) ensures balanced overvoltage limiting across differential pairs |
| 20pF junction capacitance | Preserves signal rise/fall times on 100 Mbps Ethernet and USB Full-Speed interfaces |
| 0.1Ω dynamic resistance | Reduces voltage overshoot during sub-10ns transients, critical for ESD event suppression |
| ±30kV ESD robustness | Eliminates need for secondary ESD stages in industrial port designs meeting IEC 61000-4-2 Level 4 |
Applications
| Ethernet PHY Protection | Datacom Interface Protection |
|---|---|
Use Scenario: Protecting 100BASE-TX MDI/MDI-X differential pairs in industrial switches against cable-induced surges and connector ESD. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed directly at RJ45 connector, clamping transients before reaching magnetics and PHY IC. Use Value: 24A IEC 61000-4-5 rating and 20pF capacitance prevent link dropouts while maintaining IEEE 802.3 timing margins. | Use Scenario: Shielding SFP+ module host-side lanes from hot-plug ESD and backplane coupling noise. IC Role / Device Role / Timing Role: Dual-line TVS on TX+/TX− and RX+/RX− pairs, referenced to chassis ground via pin 2. Use Value: Matched ±30kV ESD immunity and <27V clamping ensure bit-error-rate stability during field maintenance. |
| Telecom Line Interface | Industrial RS-485 Transceiver Protection |
Use Scenario: Safeguarding DSL line drivers and receivers against lightning-induced common-mode surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Common-cathode TVS on tip/ring lines with pin 2 tied to isolated telecom ground. Use Value: 12V VRWM aligns with typical line driver supply rails; 23V/−5V clamping avoids latch-up in analog front-end circuits. | Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., MAX13487) in factory automation nodes exposed to motor drive noise. IC Role / Device Role / Timing Role: Dual TVS on A/B bus lines referenced to local logic ground, absorbing 24A 8/20µs transients from nearby VFD switching. Use Value: Low 0.1Ω RDNY ensures <50ns response, preventing false triggering of receiver fail-safe thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-line TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Single-line, unidirectional, SMA package (4.5×2.7mm), 27.7V VBR, 32.9V VCL @ 17.3A | Requires two devices and larger PCB area; no integrated dual-line symmetry | Use only when discrete layout and higher power handling (>30A) outweigh space and matching constraints |
| SP1003-010 | Single-line, bidirectional, SOD-323, 12V VRWM, 23V VCL @ 12A, 35pF CJ | Half the surge rating (12A vs. 24A); higher capacitance degrades >48Mbps signal integrity | Select only for cost-sensitive, low-speed (<10Mbps) UART or GPIO protection where layout density is secondary |
Compared with SMAJ12A and SP1003-010, the AOZ8302ACI-12 uniquely delivers dual-line symmetry, 24A surge capability, and 20pF capacitance in a 2.9mm² footprint - making it optimal for compact, high-reliability datacom interfaces requiring matched differential protection.
Availability
AOZ8302ACI-12 is available at Aetrix Electronics and suitable for Ethernet PHY protection, industrial RS-485 networks, and telecom line interface designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AOZ8302ACI-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 AOZ8302ACI product line targets high-density, high-reliability transient protection for datacom and telecom infrastructure - delivering dual-line TVS performance in ultra-small packages without sacrificing surge current or ESD robustness.
FAQ
What is the maximum peak pulse current rating for AOZ8302ACI-12 per IEC 61000-4-5?
The AOZ8302ACI-12 is rated for 24A peak pulse current under the 8/20µs waveform per IEC 61000-4-5. This value is specified for both positive and negative polarity surges and is validated by characterization per Rev. 2.1 datasheet page 2. The AOZ8302ACI-12 achieves this with a clamping voltage of 23V at +24A and −5V at −24A, ensuring downstream circuit protection within safe voltage margins.
Does AOZ8302ACI-12 support bidirectional transient suppression on both I/O lines simultaneously?
Yes, the AOZ8302ACI-12 provides true bidirectional suppression on both pin 1 and pin 3 relative to pin 2 (common reference). Its internal structure consists of two back-to-back TVS diodes sharing pin 2, enabling symmetric clamping for positive and negative transients on each line - confirmed by matched VCL values in the Electrical Characteristics table for AOZ8302ACI-12 on datasheet page 4.
What is the junction capacitance of AOZ8302ACI-12 and how does it affect high-speed signal lines?
The AOZ8302ACI-12 has a typical junction capacitance of 20pF measured at 0V and 1MHz between any I/O pin and ground. This low capacitance minimizes signal attenuation and timing skew on 100BASE-TX, USB 2.0, and RS-485 lines operating up to 100 Mbps, as verified in the Typical Performance Characteristics on datasheet page 5.
Can AOZ8302ACI-12 replace AOZ8302ACI-05 in a 5V system design?
No - the AOZ8302ACI-12 has a 12V reverse working voltage (VRWM) and 13V minimum breakdown, making it unsuitable for direct substitution in 5V systems. Using AOZ8302ACI-12 in place of AOZ8302ACI-05 risks premature conduction and increased leakage, as its VRWM exceeds the 5V rail by >140%. Always match VRWM to the protected line's maximum steady-state voltage.
Is AOZ8302ACI-12 compliant with RoHS and halogen-free standards?
Yes, the AOZ8302ACI-12 is an AOS Green Product: RoHS compliant and halogen-free per AOS Green Policy (document ID AOSGreenPolicy.pdf). The SOT23-3L package contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and meets JEDEC J-STD-609 Category 1 for moisture sensitivity level (MSL) 1.
AOZ8302ACI-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13V
- Voltage - Clamping (Max) @ Ipp:
- 27V
- Current - Peak Pulse (10/1000µs):
- 24A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- Ethernet, Telecom
- Capacitance @ Frequency:
- 20pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AOZ8302ACI-12 FAQ
1.How can I place an order for AOZ8302ACI-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8302ACI-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 AOZ8302ACI-12 reliable?
The price and inventory of AOZ8302ACI-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8302ACI-12 is usually 5 days.
3.What payment methods are accepted for AOZ8302ACI-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8302ACI-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8302ACI-12?
AOZ8302ACI-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8302ACI-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 AOZ8302ACI-12?
For technical support, including AOZ8302ACI-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8302ACI-12 requirements.
6.How does Aetrix verify that AOZ8302ACI-12 is sourced from the original manufacturer or authorized distributors?
All AOZ8302ACI-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 AOZ8302ACI-12 meets industry standards.
7.What is the process for return or replacement of AOZ8302ACI-12?
All AOZ8302ACI-12 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8302ACI-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 AOZ8302ACI-12 part is unused and in its original packaging.
Return procedure for AOZ8302ACI-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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