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Alpha & Omega Semiconductor Inc. AOZ8903CI
- Part No.:
- AOZ8903CI
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
AOZ8903CI.pdf
- Description:
- TVS DIODE 5.5VWM 7VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,028
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Product details
Overview
AOZ8903CI from Alpha and Omega Semiconductor is an ultra-low capacitance transient voltage suppressor (TVS) array designed to protect four high-speed data lines-such as USB 2.0 D+/D− and VBUS-from ESD (±20kV air, ±15kV contact), lightning (4A, 8/20µs), and EFT (40A, 5/50ns). It features 0.75 pF typical junction capacitance, 5.5 V reverse working voltage, and clamps transients to ≤4.5 V at 5 A. It is deployed in video graphics cards and flat-panel display interfaces.
For engineers reviewing the AOZ8903CI datasheet, pinout, applications, or equivalent options, key selection criteria include channel count (4 protected I/O lines), ultra-low capacitance (<0.75 pF), clamping voltage under 5 A (≤4.5 V), RoHS-compliant SOT-23-6 packaging, and IEC 61000-4-2 Level 4 compliance.
Technical Context
The AOZ8903CI integrates eight steering diodes and one TVS element in a single SOT-23-6 package to provide bidirectional transient suppression across four independent channels. Each channel connects between an I/O pin and either VP (pin 5) or VN (pin 2), enabling clamping to VCC or ground depending on transient polarity.
Its architecture relies on low-capacitance PN junctions with matched input capacitance (ΔCj ≤ 0.03 pF) to preserve signal integrity on high-speed lines up to 480 Mbps. The device operates within -40°C to +85°C ambient and supports junction temperatures up to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage (VRWM) | 5.5 V - sets maximum continuous DC operating voltage before leakage rises significantly |
| Clamp Voltage (VCL) | 4.5 V at 5 A - limits peak voltage seen by protected IC during lightning surge |
| Junction Capacitance (Cj) | 0.75 pF - preserves signal rise/fall times on USB 2.0 and DVI data lines |
| ESD Rating (IEC 61000-4-2) | ±20 kV air / ±15 kV contact - exceeds Level 4 immunity requirements |
| Peak Pulse Current (IPP) | 4 A (8/20 µs) - handles standard lightning surge waveforms without failure |
| Operating Temp Range | -40°C to +85°C ambient - suitable for industrial and consumer display environments |
Pinout & Package
SOT-23-6 package: 6-pin surface-mount, RoHS-compliant, footprint compatible with JEDEC MO-178AB standard; thermal pad not present; body dimensions 2.9 mm × 1.6 mm × 1.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CH1) | I/O Channel 1 Anode | Connects to first protected data line (e.g., USB D+) |
| Pin 2 (VN) | Negative Reference Rail | Common cathode connection for all negative-side steering paths; tied to system ground |
| Pin 3 (CH2) | I/O Channel 2 Anode | Connects to second protected data line (e.g., USB D−) |
| Pin 4 (CH4) | I/O Channel 4 Anode | Connects to fourth protected line (e.g., DVI TMDS clock) |
| Pin 5 (VP) | Positive Reference Rail | Common anode connection for all positive-side steering paths; tied to +5 V supply |
| Pin 6 (CH3) | I/O Channel 3 Anode | Connects to third protected line (e.g., USB VBUS or DVI hot plug detect) |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low channel capacitance | 0.75 pF max - enables <1% signal distortion on 480 Mbps USB 2.0 links |
| Matched inter-channel capacitance | ΔCj ≤ 0.03 pF - maintains skew control across differential pairs |
| Bidirectional clamping architecture | Steering diodes to both VP (+5 V) and VN (GND) - protects against positive and negative transients without external bias |
| High ESD robustness | ±24 kV HBM - withstands handling-induced discharges during board assembly |
Applications
| USB 2.0 Port Protection | DVI Interface Protection |
|---|---|
Use Scenario: Protecting downstream USB 2.0 host ports from ESD events during cable insertion and hot-plug operation. IC Role / Device Role / Timing Role: Transient voltage suppressor array providing bidirectional clamping on D+, D−, and VBUS lines. Use Value: Maintains 480 Mbps data integrity while limiting clamped voltage to ≤4.5 V at 5 A surge current. | Use Scenario: Shielding DVI TMDS data and clock channels from electrostatic discharge in digital video transmission systems. IC Role / Device Role / Timing Role: Low-capacitance TVS array guarding three TMDS pairs and hot-plug detect line. Use Value: 0.75 pF capacitance prevents signal edge degradation; ±20 kV air ESD rating ensures panel-level compliance. |
| Video Graphics Card I/O | Flat Panel Display Interface |
Use Scenario: Safeguarding GPU output interfaces (DVI/HDMI auxiliary lines) against user-touch ESD in gaming and workstation graphics cards. IC Role / Device Role / Timing Role: Four-channel ESD protector placed at PCB edge connectors before GPU PHY. Use Value: Enables compact layout with ≤2 mm trace length from connector to AOZ8903CI, minimizing inductive overshoot. | Use Scenario: Securing LVDS or mini-DP interface lines on monitor mainboards exposed to front-panel button actuation and cable mating. IC Role / Device Role / Timing Role: Ultra-low-C TVS array protecting four high-speed serial lanes entering display controller ASIC. Use Value: ΔCj ≤ 0.03 pF ensures matched propagation delay across differential channels, preserving eye diagram opening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J5.0A | Single-channel, 5.0 V unidirectional TVS; 600 W peak power; 100 pF capacitance | Requires four discrete devices per port; unsuitable for >100 Mbps data lines due to high Cj | Select AOZ8903CI when protecting multi-lane high-speed interfaces where capacitance and layout density matter. |
| TPD4E05U06DQAR | Quad-channel, 5.5 V, 0.5 pF typical Cj; ±20 kV ESD; same SOT-23-6 package | Identical channel count and footprint; slightly lower clamp voltage (4.2 V @ 5 A) | TPD4E05U06DQAR offers marginally better clamping but lacks IEC 61000-4-5 lightning rating (4A) specified for AOZ8903CI. |
Compared with SMA6J5.0A and TPD4E05U06DQAR, the AOZ8903CI uniquely combines IEC 61000-4-5 lightning surge capability (4A), quad-channel integration in SOT-23-6, and guaranteed ≤0.75 pF capacitance-making it optimal for space-constrained, high-reliability USB/DVI protection where multi-standard compliance is mandatory.
Availability
AOZ8903CI is available at Aetrix Electronics and suitable for USB 2.0 port protection, DVI interface hardening, and flat-panel display interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AOZ8903CI 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 AOZ8903CI belongs to AOS's ultra-low-capacitance TVS array product line, engineered specifically for ESD and surge protection of high-speed digital interfaces without compromising signal fidelity.
FAQ
What is the maximum clamping voltage of the AOZ8903CI under a 5 A transient?
The AOZ8903CI clamps to a maximum of 4.5 V under a 5 A, 100 ns transient pulse applied to any I/O pin relative to ground. This value is measured per Electrical Characteristics table on page 3 of the Rev. 2.1 datasheet and ensures safe operation for 5 V logic interfaces. The clamping performance remains consistent across all four channels due to matched internal diode construction in the AOZ8903CI.
Does the AOZ8903CI support bidirectional ESD protection?
Yes, the AOZ8903CI provides bidirectional protection via integrated steering diodes connected between each I/O pin and both VP (pin 5, +5 V rail) and VN (pin 2, ground). This architecture allows it to clamp positive transients to VP and negative transients to VN, satisfying IEC 61000-4-2 ±20 kV air and ±15 kV contact requirements. No external bias is needed-the AOZ8903CI functions autonomously in either polarity.
What is the junction capacitance specification for the AOZ8903CI, and why does it matter?
The AOZ8903CI has a typical junction capacitance of 0.75 pF per channel at 0 V bias and 1 MHz, with matching tolerance (ΔCj) of ≤0.03 pF between channels. This ultra-low value prevents signal attenuation and timing skew on high-speed lines such as USB 2.0 (480 Mbps) and DVI TMDS, ensuring minimal impact on eye diagram integrity. The AOZ8903CI's Cj is confirmed in the "Electrical Characteristics" table on page 3 of its official datasheet.
Can the AOZ8903CI be used to protect USB VBUS lines?
Yes, the AOZ8903CI is explicitly rated for USB 2.0 power and data line protection, including VBUS. Pin 6 (CH3) is designated for VBUS or hot-plug detect lines, and its 5.5 V VRWM and 6.0 V VBR ensure compatibility with 5 V nominal bus operation. The device clamps overvoltage transients on VBUS to ≤4.5 V at 5 A, safeguarding downstream power switches and load switches without interfering with normal 5 V delivery in the AOZ8903CI's operational envelope.
Is the AOZ8903CI compliant with IEC 61000-4-5 lightning surge standards?
Yes, the AOZ8903CI is rated for IEC 61000-4-5 (lightning) with a peak pulse current of 4 A using the 8/20 µs waveform, as stated in the "Features" section (page 1) and "Absolute Maximum Ratings" table (page 2) of its Rev. 2.1 datasheet. This certification validates its use in equipment exposed to indirect lightning-induced surges on data and power lines-distinct from ESD-only suppressors-and confirms robustness beyond basic ESD protection in the AOZ8903CI.
AOZ8903CI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.5V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 7V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 0.5pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
AOZ8903CI FAQ
1.How can I place an order for AOZ8903CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8903CI 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 AOZ8903CI reliable?
The price and inventory of AOZ8903CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8903CI is usually 5 days.
3.What payment methods are accepted for AOZ8903CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8903CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8903CI?
AOZ8903CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8903CI 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 AOZ8903CI?
For technical support, including AOZ8903CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8903CI requirements.
6.How does Aetrix verify that AOZ8903CI is sourced from the original manufacturer or authorized distributors?
All AOZ8903CI 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 AOZ8903CI meets industry standards.
7.What is the process for return or replacement of AOZ8903CI?
All AOZ8903CI units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8903CI, 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 AOZ8903CI part is unused and in its original packaging.
Return procedure for AOZ8903CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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