My Inquiry
My Account
Alpha & Omega Semiconductor Inc. AOZ8S321UD4-03
- Part No.:
- AOZ8S321UD4-03
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 10-UFDFN
- Datasheet:
-
AOZ8S321UD4-03.pdf
- Description:
- TVS DIODE 3.3VWM 7VC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,632
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AOZ8S321UD4-03 from Alpha & Omega Semiconductor is a 4-channel ultra-low capacitance transient voltage suppressor (TVS) diode array designed for ESD protection of high-speed differential data lines. It delivers 0.15 pF line-to-line capacitance, ±15 kV IEC 61000-4-2 contact/air ESD rating, and 3.3 V operating voltage, enabling signal integrity preservation in HDMI 1.4/2.0 and USB 3.0/3.1 interfaces.
For engineers reviewing the AOZ8S321UD4-03 datasheet, pinout, applications, or equivalent options, key selection criteria include I/O-to-GND capacitance (0.28 pF), clamping voltage at 1 A (±1.3 V), junction temperature range (−40°C to +125°C), DFN-10 package footprint (2.5 mm × 1.0 mm), and IEC 61000-4-5 surge rating (5 A, 8/20 μs).
Technical Context
The AOZ8S321UD4-03 integrates four unidirectional TVS diodes with internal steering architecture that routes transients to VCC or GND during overvoltage events. Its construction uses low-inductance die bonding and optimized trace routing within the DFN-10 package to minimize voltage overshoot under fast TLP pulses.
It operates as a passive clamping device with fixed reverse working voltage (3.3 V), breakdown voltage ≥5 V at 100 µA, and dynamic resistance of 0.3 Ω between 8 A–16 A TLP current. The device supports bidirectional clamping on I/O-to-GND paths while maintaining flow-through layout compatibility for HDMI/USB differential pairs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage | 3.3 V - defines maximum continuous DC voltage applied without conduction |
| Line-to-Line Capacitance | 0.15 pF - ensures minimal signal distortion on HDMI/USB 3.x differential lanes |
| I/O-to-GND Capacitance | 0.28 pF - maintains impedance matching and reduces insertion loss |
| Clamping Voltage (±1 A TLP) | ±1.3 V - limits transient voltage seen by downstream PHY ICs during ESD strike |
| ESD Rating (IEC 61000-4-2) | ±15 kV contact/air - meets industrial and consumer interface immunity requirements |
| Surge Rating (IEC 61000-4-5) | 5 A (8/20 μs) - withstands lightning-induced surges on external I/O connectors |
| Junction Temperature Range | −40°C to +125°C - supports operation in automotive infotainment and industrial display environments |
Pinout & Package
AOZ8S321UD4-03 is housed in a RoHS-compliant, halogen-free 2.5 mm × 1.0 mm × 0.55 mm DFN-10 package with exposed thermal pad. Pins 1, 2, 4, and 5 connect to internal TVS elements for I/O protection; pins 6, 7, 9, and 10 are no-connect terminals used for mechanical stability during PCB reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 | Protected I/O Terminals | Direct connection points for HDMI TX/RX or USB 3.x differential pairs; internally tied to TVS anodes/cathodes |
| 3, 8 | Ground Reference | Low-inductance GND return paths for clamping current; connected to exposed thermal pad |
| 6, 7, 9, 10 | No Connect (NC) | Non-functional pads for mechanical anchoring; must not be routed or biased |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low line-to-line capacitance | 0.15 pF enables full compliance with HDMI 2.0 eye diagram and USB 3.1 Gen 1 jitter budgets |
| Flow-through pinout layout | Pins 1–2–4–5 align with standard HDMI/USB differential pair routing, eliminating signal detours and stubs |
| High ESD immunity | ±15 kV IEC 61000-4-2 rating protects against user-handling ESD in consumer electronics assembly and field use |
| Low clamping voltage at 1 A | ±1.3 V clamping ensures protected PHY ICs remain below absolute maximum input voltage limits during ESD events |
Applications
| HDMI 1.4/2.0 Transmitter Protection | USB 3.0/3.1 Host Interface Protection |
|---|---|
Use Scenario: Protecting HDMI source outputs (TX0+/−, TX1+/−, TX2+/−, CLK+/−) in digital TVs and set-top boxes from connector ESD. IC Role / Device Role / Timing Role: Passive clamping TVS array placed directly at HDMI connector to shunt transients before reaching SerDes PHY. Use Value: 0.15 pF line-to-line capacitance preserves TMDS signal integrity up to 6 Gbps, preventing bit errors and link training failures. | Use Scenario: Safeguarding USB 3.0 SuperSpeed differential pairs (SSTX+/−, SSRX+/−) on notebook motherboard I/O headers. IC Role / Device Role / Timing Role: Bidirectional ESD clamp on host-side USB 3.x lanes, referenced to local ground plane. Use Value: 0.28 pF I/O-to-GND capacitance avoids USB 3.0 eye mask violations and maintains SS receiver sensitivity. |
| V-by-One® Display Interface Protection | Flat Panel Display Timing Controller (TCON) Protection |
Use Scenario: Shielding V-by-One® high-speed video links (up to 3.75 Gbps per lane) in commercial monitors and digital signage. IC Role / Device Role / Timing Role: Four-channel TVS array deployed at display module edge connector to suppress cable discharge events. Use Value: Low dynamic resistance (0.3 Ω) minimizes clamping voltage overshoot during 100 ns TLP pulses, protecting LVDS-compatible receivers. | Use Scenario: ESD hardening of TCON output lanes driving LVDS or mini-LVDS panels in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Signal-line TVS placed between TCON ASIC and flexible printed circuit (FPC) connector. Use Value: −40°C to +125°C junction rating ensures reliability across extended temperature operation in sealed display enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J3.3A | Single-channel, 3.3 V unidirectional TVS; 100 pF capacitance; DO-214AC package | Requires four discrete devices and board area >4× larger; unsuitable for HDMI/USB high-speed lanes | Select AOZ8S321UD4-03 when space-constrained, multi-lane, low-capacitance protection is required. |
| TPD4E001DQAR | 4-channel, 0.5 pF I/O-to-GND capacitance; ±12 kV ESD rating; same DFN-10 footprint but higher capacitance | Higher capacitance degrades USB 3.0 eye margin; acceptable only for lower-speed interfaces like DisplayPort 1.2 | Choose AOZ8S321UD4-03 over TPD4E001DQAR where HDMI 2.0 or USB 3.1 Gen 1 signal fidelity is critical. |
Compared with SMA6J3.3A and TPD4E001DQAR, the AOZ8S321UD4-03 uniquely combines 0.15 pF line-to-line capacitance, ±15 kV ESD rating, and integrated 4-channel DFN-10 packaging-enabling direct drop-in protection for next-generation high-definition video and data interfaces without compromising signal integrity.
Availability
AOZ8S321UD4-03 is available at Aetrix Electronics and suitable for HDMI 2.0 transmitter modules, USB 3.1 host controllers, and V-by-One® display interfaces requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AOZ8S321UD4-03 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 power management and circuit protection.
The AOZ8S321UD4-03 belongs to AOS's ultra-low capacitance TVS diode array product line, engineered specifically to protect high-speed serial interfaces-including HDMI, USB 3.x, and V-by-One-from ESD and surge without degrading signal fidelity.
FAQ
What is the primary function of the AOZ8S321UD4-03 in a high-speed data interface?
The AOZ8S321UD4-03 functions as a 4-channel transient voltage suppressor that clamps ESD and surge transients on differential data lines such as HDMI and USB 3.x. It routes overvoltage energy to ground or VCC via internal steering diodes, limiting peak voltage seen by sensitive PHY ICs to ±1.3 V at 1 A TLP current. Its 0.15 pF line-to-line capacitance ensures minimal impact on signal integrity, making AOZ8S321UD4-03 ideal for preserving eye diagrams in multi-gigabit interfaces.
Does the AOZ8S321UD4-03 require external biasing or control signals?
No, the AOZ8S321UD4-03 is a fully passive device with no external bias, enable pins, or control logic. It operates automatically based on voltage thresholds: below 3.3 V reverse working voltage, leakage remains ≤50 nA; above breakdown (~5 V), internal TVS diodes conduct to clamp transients. This self-contained behavior eliminates design complexity and makes AOZ8S321UD4-03 compatible with any high-speed interface without firmware or configuration dependencies.
Can the AOZ8S321UD4-03 be used for both HDMI and USB 3.0 protection simultaneously?
Yes, the AOZ8S321UD4-03 is explicitly validated for both HDMI 1.4/2.0 and USB 3.0/3.1 applications, as confirmed in its datasheet General Description and Typical Applications sections. Its flow-through pinout (Pins 1,2,4,5) maps directly to HDMI TX/RX or USB SSTX/SSRX differential pairs, and its 0.15 pF line-to-line capacitance meets the stringent signal integrity requirements of both standards. AOZ8S321UD4-03 has been deployed in designs supporting dual-interface ports where shared PCB layout constraints demand a single, optimized protection solution.
What is the significance of the NC pins (6, 7, 9, 10) on the AOZ8S321UD4-03 DFN-10 package?
Pins 6, 7, 9, and 10 on the AOZ8S321UD4-03 are designated No Connect (NC) and serve solely as mechanical anchors to enhance solder joint reliability during reflow. They are electrically isolated from internal circuitry and must not be routed, grounded, or biased. This NC configuration allows the DFN-10 footprint to maintain structural rigidity while enabling the compact 2.5 mm × 1.0 mm size needed for dense high-speed layouts-ensuring AOZ8S321UD4-03 remains mechanically robust without adding parasitic capacitance or crosstalk risk.
How does the AOZ8S321UD4-03 compare to standard TVS diodes in terms of PCB layout impact?
Unlike discrete TVS diodes that force signal trace detours and introduce stubs, the AOZ8S321UD4-03 features a flow-through pinout that allows HDMI or USB differential pairs to pass straight through Pins 1–2 and 4–5 with no routing deviation. This eliminates impedance discontinuities and reduces parasitic inductance, directly improving ESD clamping response and signal fidelity. AOZ8S321UD4-03's DFN-10 package also places GND pins (3,8) adjacent to protected I/Os, shortening current loop paths-making it significantly more layout-efficient than traditional TVS solutions.
AOZ8S321UD4-03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 10-UFDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 5V
- Voltage - Clamping (Max) @ Ipp:
- 7V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- HDMI, USB
- Capacitance @ Frequency:
- 280pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (2.5x1)
AOZ8S321UD4-03 FAQ
1.How can I place an order for AOZ8S321UD4-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8S321UD4-03 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 AOZ8S321UD4-03 reliable?
The price and inventory of AOZ8S321UD4-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8S321UD4-03 is usually 5 days.
3.What payment methods are accepted for AOZ8S321UD4-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8S321UD4-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8S321UD4-03?
AOZ8S321UD4-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8S321UD4-03 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 AOZ8S321UD4-03?
For technical support, including AOZ8S321UD4-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8S321UD4-03 requirements.
6.How does Aetrix verify that AOZ8S321UD4-03 is sourced from the original manufacturer or authorized distributors?
All AOZ8S321UD4-03 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 AOZ8S321UD4-03 meets industry standards.
7.What is the process for return or replacement of AOZ8S321UD4-03?
All AOZ8S321UD4-03 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8S321UD4-03, 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 AOZ8S321UD4-03 part is unused and in its original packaging.
Return procedure for AOZ8S321UD4-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8S321UD4-03 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
