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Alpha & Omega Semiconductor Inc. AOZ8S325BDS-40
- Part No.:
- AOZ8S325BDS-40
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 2-UDFN
- Datasheet:
-
AOZ8S325BDS-40.pdf
- Description:
- 1CH 40V BIDIRECTIONAL LOW CAP TV
- Quantity:
- Payment:
- Shipping:
Inventory:5,208
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Product details
Overview
AOZ8S325BDS-40 from Alpha & Omega Semiconductor is a 1-channel bidirectional TVS diode array designed for ESD and surge protection of high-speed data lines. It delivers 0.35 pF typical junction capacitance, ±8 kV IEC 61000-4-2 ESD immunity (contact/air), 40 V reverse working voltage, and 55 V clamping voltage at 1 A TLP - enabling robust signal integrity in USB 2.0, HDMI, and MIPI interfaces.
For engineers reviewing the AOZ8S325BDS-40 datasheet, pinout, applications, or equivalent options, key selection criteria include low-capacitance transient suppression, bidirectional clamping behavior, DFN1.0×0.6-2L package compatibility with space-constrained PCB layouts, and compliance with IEC 61000-4-2/4-4/4-5 standards for mobile and computing end-equipment.
Technical Context
The AOZ8S325BDS-40 integrates two unidirectional TVS diodes in antiparallel configuration to achieve true bidirectional clamping across a single I/O line. Its low 0.35 pF capacitance minimizes signal distortion on high-frequency data paths up to 1 GHz, while maintaining 55 V clamping at 1 A TLP and 58 V at 1 A IEC 61000-4-5 surge.
It operates over -40°C to +125°C junction temperature and features 40 V reverse working voltage with <100 nA leakage at VRWM. The device meets IEC 61000-4-2 (±8 kV contact/air), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (1 A 8/20 µs) immunity requirements without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage | 40 V - defines maximum continuous DC or peak AC signal voltage the device blocks without conduction |
| Junction Capacitance | 0.35 pF (typ) - enables minimal loading on high-speed data lines (e.g., USB 2.0, MIPI D-PHY) |
| Clamping Voltage (TLP, 1 A) | 55 V - limits transient-induced voltage overshoot during fast ESD events (100 ns pulse) |
| ESD Rating (IEC 61000-4-2) | ±8 kV contact / ±8 kV air - ensures reliability against human-body and proximity discharge in handheld devices |
| Surge Rating (IEC 61000-4-5) | 1 A (8/20 µs) - provides line-level protection against induced lightning surges and power cross events |
| Operating Temperature | -40°C to +125°C - supports deployment in automotive infotainment and industrial portable equipment |
Pinout & Package
AOZ8S325BDS-40 is housed in a RoHS-compliant, halogen-free DFN1.0×0.6-2L package (1.0 mm × 0.6 mm × 0.5 mm) with bottom-side thermal pad and two terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of Diode A / Cathode of Diode B | Common I/O terminal - connects directly to protected data line (e.g., USB D+, HDMI TMDS+) |
| 2 | Cathode of Diode A / Anode of Diode B | Ground reference terminal - must be connected to low-impedance system ground plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Antiparallel dual-diode structure enables symmetric positive/negative transient suppression without polarity constraints |
| Ultra-low 0.35 pF junction capacitance | Preserves signal rise/fall times and eye diagram integrity on 480 Mbps USB 2.0 and 1.5 Gbps MIPI links |
| 55 V TLP clamping at 1 A | Ensures downstream ICs (e.g., USB transceivers) remain below absolute maximum ratings during ESD strikes |
| IEC 61000-4-4 EFT immunity (40 A) | Withstands repetitive electrical fast transients common in industrial and automotive power environments |
Applications
| USB 2.0 Data Lines | HDMI TMDS Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+ and D− lines in smartphones, tablets, and docking stations from user-handling ESD. IC Role / Device Role: Bidirectional TVS array placed immediately adjacent to connector, shunting transients to ground before reaching USB PHY. Use Value: 0.35 pF capacitance avoids signal degradation; ±8 kV ESD rating exceeds IEC 61000-4-2 Level 4 requirement. | Use Scenario: Safeguarding HDMI 1.4/2.0 TMDS clock and data channels in monitors, set-top boxes, and gaming consoles. IC Role / Device Role: Single-channel TVS per TMDS pair, mounted at source PCB edge to suppress connector-coupled surges and ESD. Use Value: 55 V clamping prevents HDMI receiver latch-up; 40 V VRWM accommodates TMDS DC bias swing. |
| MIPI D-PHY Interfaces | Industrial Serial Communication |
Use Scenario: Shielding camera sensor module CSI-2 lanes in automotive ADAS cameras and drone vision systems. IC Role / Device Role: Per-lane TVS protection on high-speed MIPI D-PHY differential pairs operating up to 1.5 Gbps. Use Value: Low capacitance preserves 800 mVpp differential swing; -40°C to +125°C rating matches under-hood thermal requirements. | Use Scenario: Securing RS-485/RS-422 data lines in factory automation controllers exposed to motor drive noise and lightning-induced surges. IC Role / Device Role: Point-of-entry TVS on twisted-pair bus lines, referenced to local ground with minimal trace inductance. Use Value: 1 A IEC 61000-4-5 surge rating handles induced line transients; 40 V VRWM aligns with common 3.3 V/5 V bus logic levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Unidirectional, 40 V VRWM, 64.5 V VC @ 1 A, 1.5 pF CJ, SMA package (4.5 mm × 2.7 mm) | Requires external series resistor or dual-device layout for bidirectional protection; higher capacitance degrades >100 Mbps signals | Use only where board space permits larger package and signal bandwidth ≤ 50 Mbps |
| TPD2E001DRYR | Bidirectional, 5 V VRWM, 12 V VC @ 1 A, 0.9 pF CJ, DRY (1.0 mm × 0.6 mm) package | Lower VRWM restricts use to 3.3 V or 5 V logic; insufficient for 12 V–40 V industrial or automotive data buses | Select when protecting low-voltage interfaces like I²C or UART, not high-VRWM applications |
Compared with SMAJ40A and TPD2E001DRYR, the AOZ8S325BDS-40 uniquely combines 40 V VRWM, 0.35 pF capacitance, and DFN1.0×0.6-2L footprint - making it the only option among the three suitable for compact, high-speed, high-voltage data line protection without redesigning layout or sacrificing bandwidth.
Availability
AOZ8S325BDS-40 is available at Aetrix Electronics and suitable for notebook computers, portable devices, digital cameras, and industrial serial communication systems requiring stable component supply and long-term lifecycle support.
Supply support for AOZ8S325BDS-40 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 AOZ8S325BDS-40 belongs to AOS's low-capacitance TVS portfolio, engineered specifically for ESD/surge hardening of high-speed digital interfaces in mobile, computing, and automotive electronics.
FAQ
What is the primary circuit role of the AOZ8S325BDS-40 in a system?
The AOZ8S325BDS-40 serves as a bidirectional transient voltage suppressor on single-ended or differential data lines. It clamps ESD and surge energy to ground or VCC by leveraging its antiparallel dual-diode structure. In practice, the AOZ8S325BDS-40 is placed at the I/O connector to limit transient voltages before they reach sensitive transceivers - ensuring compliance with IEC 61000-4-2 Level 4 and preventing latch-up or permanent damage.
Does the AOZ8S325BDS-40 require an external bias voltage or control signal to operate?
No, the AOZ8S325BDS-40 is a passive, silicon-based TVS diode array with no control pins or bias requirements. It operates solely based on its intrinsic breakdown characteristics: conducting only when voltage across its terminals exceeds the reverse breakdown threshold (~43–53 V). This makes the AOZ8S325BDS-40 inherently compatible with any data line regardless of logic family, speed, or DC bias level within its 40 V VRWM rating.
Can the AOZ8S325BDS-40 protect differential signal pairs such as USB 2.0 or MIPI D-PHY?
Yes - the AOZ8S325BDS-40 is commonly deployed per differential lane (e.g., one AOZ8S325BDS-40 on D+, another on D−) due to its low 0.35 pF capacitance and symmetrical clamping. Its DFN1.0×0.6-2L footprint allows tight placement near connectors without skewing differential impedance. The AOZ8S325BDS-40 has been validated in USB 2.0 eye diagrams and MIPI D-PHY jitter tests, confirming signal integrity preservation up to 480 Mbps and 1.5 Gbps respectively.
What is the thermal performance limitation of the AOZ8S325BDS-40 during repeated ESD events?
The AOZ8S325BDS-40 is rated for junction temperatures from -40°C to +125°C and exhibits no thermal derating for single ESD pulses per IEC 61000-4-2. However, under repetitive 1 A TLP stress (>100 Hz), localized heating may accumulate. Layout best practices - including direct thermal connection of the DFN thermal pad to a solid ground plane and minimizing trace inductance - are essential to dissipate energy and maintain the AOZ8S325BDS-40 within safe operating limits during burst-mode testing.
Is the AOZ8S325BDS-40 compliant with automotive AEC-Q200 or industrial reliability standards?
The AOZ8S325BDS-40 is not AEC-Q200 qualified, but it meets key automotive-relevant stress tests: IEC 61000-4-2 (±8 kV), IEC 61000-4-4 (40 A), and operation from -40°C to +125°C. Its halogen-free, RoHS-compliant DFN1.0×0.6-2L package supports lead-free reflow. While not formally certified, the AOZ8S325BDS-40 is widely used in automotive infotainment and ADAS camera modules where customer-level qualification covers thermal cycling, humidity, and ESD robustness.
AOZ8S325BDS-40 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):
- 40V (Max)
- Voltage - Breakdown (Min):
- 43V
- Voltage - Clamping (Max) @ Ipp:
- 58V (Typ)
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 0.35pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1x0.6)
AOZ8S325BDS-40 FAQ
1.How can I place an order for AOZ8S325BDS-40 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8S325BDS-40 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 AOZ8S325BDS-40 reliable?
The price and inventory of AOZ8S325BDS-40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8S325BDS-40 is usually 5 days.
3.What payment methods are accepted for AOZ8S325BDS-40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8S325BDS-40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8S325BDS-40?
AOZ8S325BDS-40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8S325BDS-40 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 AOZ8S325BDS-40?
For technical support, including AOZ8S325BDS-40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8S325BDS-40 requirements.
6.How does Aetrix verify that AOZ8S325BDS-40 is sourced from the original manufacturer or authorized distributors?
All AOZ8S325BDS-40 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 AOZ8S325BDS-40 meets industry standards.
7.What is the process for return or replacement of AOZ8S325BDS-40?
All AOZ8S325BDS-40 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8S325BDS-40, 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 AOZ8S325BDS-40 part is unused and in its original packaging.
Return procedure for AOZ8S325BDS-40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8S325BDS-40 Tags
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