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Alpha & Omega Semiconductor Inc. AOZ8212CI-24
- Part No.:
- AOZ8212CI-24
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AOZ8212CI-24.pdf
- Description:
- TVS DIODE 24VWM 40VC SOT23A-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,710
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Product details
Overview
AOZ8212CI-24 from Alpha & Omega Semiconductor is a two-line bidirectional TVS diode in SOT-23A package, rated for 24 V working peak reverse voltage (VRWM), 29 V minimum breakdown voltage (VBR), and clamping voltage of 37 V at 1 A and 40 V at 10 A. It delivers ±15 kV contact / ±18 kV air ESD protection per IEC 61000-4-2 and 2.5 A peak pulse current (8/20 µs) for transient suppression on data or control lines in portable electronics.
For engineers reviewing the AOZ8212CI-24 datasheet, pinout, applications, or equivalent options, key selection criteria include its 24 V operating voltage rating, low 11 pF typical capacitance, bidirectional dual-line protection architecture, and compatibility with space-constrained PCB layouts requiring IEC-compliant ESD hardening.
Technical Context
The AOZ8212CI-24 integrates two identical bidirectional TVS elements in a single SOT-23A package, enabling simultaneous protection of two independent signal or data lines without polarity constraints. Its silicon avalanche structure provides fast response (<1 ns) to transients and maintains low clamping voltage under 2.5 A surge conditions.
Designed for DC-coupled signal paths, it operates across –40 °C to +85 °C ambient, supports IEC 61000-4-4 (EFT ±40 A), and meets IEC 61000-4-5 (lightning) with 2.5 A (8/20 µs) surge capability - lower than AOZ8212CI-05L/CI-12 due to higher VRWM and optimized junction design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - maximum continuous reverse voltage before conduction; sets upper limit for protected line operating voltage |
| VBR (min @ 5 mA) | 29 V - guaranteed avalanche onset threshold; ensures reliable triggering above normal operating range |
| VCL @ IPP = 1 A | 37 V - clamped voltage during low-energy transients; limits stress on downstream ICs |
| VCL @ IPP = 10 A | 40 V - clamped voltage under high-energy surges; defines worst-case overvoltage exposure |
| CJ (typ @ 0 V, 1 MHz) | 11 pF - low signal-line capacitance; preserves integrity of high-speed interfaces like USB 2.0 or I²C |
| ESD Contact (IEC 61000-4-2) | ±15 kV - certified immunity level for direct human touch events on exposed connectors or buttons |
| Peak Pulse Current (8/20 µs) | 2.5 A - surge-handling capacity for lightning-induced transients per IEC 61000-4-5 |
Pinout & Package
SOT-23A package: 3-pin surface-mount, 2.90 mm × 1.30 mm × 0.95 mm body, gull-wing leads, JEDEC TO-236HAA compliant. Pin 1 and Pin 3 are bidirectional I/O terminals; Pin 2 is common cathode/anode reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O Line 1 | Bidirectional transient path for first protected signal line; connects directly to connector or IC pin |
| Pin 2 | Common Terminal | Shared reference node for both TVS junctions; must be tied to system ground or common return |
| Pin 3 | I/O Line 2 | Bidirectional transient path for second protected signal line; electrically symmetric to Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional dual-line protection | Single device safeguards two independent signal paths without polarity awareness or external biasing |
| Low clamping voltage (37 V @ 1 A) | Minimizes voltage overshoot during ESD events, reducing risk of latch-up or damage to 24 V-rated interface ICs |
| 11 pF typical junction capacitance | Enables use on 10–50 Mbps digital lines (e.g., CAN FD, RS-485, industrial I/O) without signal distortion |
| IEC 61000-4-4 EFT immunity (±40 A) | Withstands repetitive electrical fast transients common in industrial power supply environments |
| RoHS-compliant Green Product | Halogen-free construction meets environmental compliance requirements for global consumer and industrial shipments |
Applications
| Portable GPS Receivers | Digital Cameras |
|---|---|
Use Scenario: Protecting UART/USB data lines between GPS module and host MCU from ESD during user handling or antenna coupling. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on serial communication lines operating near 24 V rail in automotive-grade portable units. Use Value: Prevents firmware lockup or sensor corruption caused by ±15 kV contact discharge while maintaining <12 pF loading on 115.2 kbps UART signals. | Use Scenario: Shielding image sensor control lines (e.g., I²C clock/data) from ESD during lens cap removal or battery insertion. IC Role / Device Role / Timing Role: Dual-line ESD clamp for low-voltage control bus shared between CMOS sensor and baseband processor. Use Value: Ensures uninterrupted auto-focus and exposure calibration by limiting transient voltage to ≤40 V during ±18 kV air discharge events. |
| Notebook Computer Keypads | Industrial Handheld Terminals |
Use Scenario: Guarding mechanical keypad scan matrix lines against user-induced ESD in clamshell-form factor notebooks. IC Role / Device Role / Timing Role: Two-channel TVS for row/column scan lines referenced to 24 V backlight or system rail. Use Value: Eliminates false keypresses and microcontroller resets by clamping transients within 1 ns while adding only 11 pF per line. | Use Scenario: Hardening RS-485 differential pair and auxiliary GPIO lines in warehouse barcode scanners exposed to 4 kV EFT noise. IC Role / Device Role / Timing Role: Dual-line protector for half-duplex data interface and status LED control lines sharing 24 V supply. Use Value: Maintains communication uptime under combined IEC 61000-4-2 (±15 kV) and IEC 61000-4-4 (±40 A) stress without degrading signal edge rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Unidirectional, SMA package (4.5 × 2.7 mm), 38.9 V VBR min, 38.9 V clamping @ 1 A, 100 pF CJ | Requires separate devices per line; unsuitable for space-constrained dual-line routing | Select when board area allows discrete placement and unidirectional protection suffices |
| TPD2E001DRSR | Two-line bidirectional, SOT-23-6, 5 V VRWM, 1.5 pF CJ, ±8 kV contact ESD | Lower voltage rating and ESD level; optimized for USB/low-voltage logic, not 24 V systems | Select only for sub-6 V interfaces where ultra-low capacitance outweighs voltage and ESD margin needs |
Compared with SMAJ24A and TPD2E001DRSR, the AOZ8212CI-24 uniquely balances 24 V operation, ±15 kV contact ESD rating, and 11 pF capacitance in a 3-pin SOT-23A footprint - making it the only option that simultaneously satisfies dual-line protection, industrial voltage levels, and compact layout requirements.
Availability
AOZ8212CI-24 is available at Aetrix Electronics and suitable for portable GPS receivers, digital cameras, notebook computer keypads, and industrial handheld terminals requiring stable component supply with full traceability and lifecycle support.
Supply support for AOZ8212CI-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 & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, TVS diodes, and power ICs for efficiency-critical applications.
The AOZ8212 family targets compact, high-reliability ESD protection for multi-line interfaces in portable and industrial electronics - emphasizing low capacitance, precise voltage ratings, and standardized SOT-23A packaging.
FAQ
What is the working peak reverse voltage rating of the AOZ8212CI-24?
The AOZ8212CI-24 has a working peak reverse voltage (VRWM) of 24 V, meaning it can continuously block up to 24 V in normal operation without conducting. This rating makes it suitable for protecting circuits powered from or referenced to 24 V rails, such as industrial sensors or automotive accessory modules. Exceeding this voltage may cause unintended conduction and compromise protection integrity.
Does the AOZ8212CI-24 support bidirectional transient suppression on both lines simultaneously?
Yes, the AOZ8212CI-24 integrates two symmetrical bidirectional TVS elements sharing a common terminal (Pin 2), allowing independent and simultaneous suppression of positive and negative transients on Pin 1 and Pin 3. This architecture eliminates the need for polarity-aware routing and enables protection of AC-coupled or floating signal pairs without external components.
What is the clamping voltage behavior of the AOZ8212CI-24 under surge conditions?
The AOZ8212CI-24 clamps to 37 V at 1 A and 40 V at 10 A (8/20 µs waveform). These values represent the maximum voltage imposed on protected lines during standardized surge events. The relatively flat clamping curve ensures predictable overvoltage limiting across its rated surge range, critical for safeguarding 24 V-tolerant interface ICs like RS-485 transceivers or CAN controllers.
Can the AOZ8212CI-24 be used in place of the AOZ8212CI-12 or AOZ8212CI-05L?
No - the AOZ8212CI-24 is not a drop-in replacement for AOZ8212CI-12 or AOZ8212CI-05L due to different VRWM (24 V vs. 12 V or 5 V), VBR, and ESD/surge ratings. Substituting it into a 5 V circuit risks premature conduction; using a lower-voltage variant in a 24 V system forfeits protection margin. Each variant must be selected based on the protected line's operating voltage and required immunity level.
Is the AOZ8212CI-24 RoHS and halogen-free compliant?
Yes, the AOZ8212CI-24 is an AOS Green Product, fully RoHS compliant and manufactured with reduced halogen content per AOS environmental policy. This compliance is documented in the official datasheet and verified through material declarations, supporting export to EU, China, and other regulated markets requiring strict substance restrictions.
AOZ8212CI-24 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 29V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 2.5A (8/20µs)
- Power - Peak Pulse:
- 100W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 11pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23A-3
AOZ8212CI-24 FAQ
1.How can I place an order for AOZ8212CI-24 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8212CI-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 AOZ8212CI-24 reliable?
The price and inventory of AOZ8212CI-24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8212CI-24 is usually 5 days.
3.What payment methods are accepted for AOZ8212CI-24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8212CI-24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8212CI-24?
AOZ8212CI-24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8212CI-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 AOZ8212CI-24?
For technical support, including AOZ8212CI-24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8212CI-24 requirements.
6.How does Aetrix verify that AOZ8212CI-24 is sourced from the original manufacturer or authorized distributors?
All AOZ8212CI-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 AOZ8212CI-24 meets industry standards.
7.What is the process for return or replacement of AOZ8212CI-24?
All AOZ8212CI-24 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8212CI-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 AOZ8212CI-24 part is unused and in its original packaging.
Return procedure for AOZ8212CI-24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8212CI-24 Tags
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