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Alpha & Omega Semiconductor Inc. AOZ8251BDI-05
- Part No.:
- AOZ8251BDI-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 0201 (0603 Metric)
- Datasheet:
-
AOZ8251BDI-05.pdf
- Description:
- TVS DIODE 5VWM 24VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,337
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Product details
Overview
AOZ8251BDI-05 from Alpha & Omega Semiconductor is a one-line bi-directional TVS diode in a DFN 0.62 mm × 0.32 mm × 0.5 mm package, rated for -40°C to +125°C operation, with 5 V reverse working voltage, ±20 kV IEC 61000-4-2 ESD protection (air/contact), and 4 A peak pulse current (8/20 µs), used to protect high-speed data lines in portable electronics.
For engineers reviewing the AOZ8251BDI-05 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage at 1 A (8–11 V), junction capacitance (5–6.5 pF), dynamic resistance (0.55 Ω), reverse leakage (<100 nA at 5 V), and compliance with IEC 61000-4-5 lightning surge (4 A).
Technical Context
This bi-directional TVS diode operates symmetrically across signal-to-ground paths, enabling robust ESD and transient suppression on single-ended high-speed lines without polarity constraints. Its ultra-low capacitance and sub-1 Ω dynamic resistance ensure minimal signal distortion while maintaining fast response to transients up to 16 A TLP.
The device is characterized per IEC 61000-4-2 (±20 kV contact/air), IEC 61000-4-5 (4 A, 8/20 µs), and HBM (±30 kV), with breakdown voltage tightly specified at 5.5–8 V and clamping voltage bounded at 15–18 V under 4 A surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage | 5 V - Maximum continuous DC voltage applied without significant leakage or conduction. |
| Breakdown Voltage (VBR) | 5.5–8 V at IT = 1 mA - Threshold where device transitions from high-impedance to low-impedance clamping state. |
| Clamping Voltage (VCL) | 15–18 V at IPP = 4 A (8/20 µs) - Peak voltage seen by protected circuit during full-rated lightning surge. |
| Junction Capacitance | 5–6.5 pF at 0 V, 1 MHz - Enables use on USB 2.0, HDMI, or touch interface lines without signal integrity degradation. |
| Dynamic Resistance | 0.55 Ω - Low impedance during clamping ensures efficient energy diversion and tight voltage control. |
| ESD Rating | ±20 kV air / ±20 kV contact per IEC 61000-4-2 - Exceeds Level 4 immunity requirement for handheld consumer devices. |
Pinout & Package
AOZ8251BDI-05 is housed in an RoHS-compliant DFN package measuring 0.62 mm × 0.32 mm × 0.5 mm, with two terminals: Pin 1 (Anode/Cathode shared) and Pin 2 (Cathode/Anode shared), configured for bi-directional signal-line protection between I/O and ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O Terminal | Bi-directional connection point for protected signal line; conducts during both positive and negative transients. |
| Pin 2 | Ground Terminal | Reference node for clamping; must be connected to low-inductance system ground to maintain effective ESD path. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±20 kV contact/air - Ensures reliable operation in real-world handling and environmental discharge events. |
| Low junction capacitance | 5–6.5 pF - Preserves signal rise/fall times on high-speed interfaces like USB, I²C, and touch sensors. |
| Tight clamping performance | 15–18 V at 4 A (8/20 µs) - Limits stress on downstream ICs such as PMICs, microcontrollers, or interface transceivers. |
| Ultra-small DFN footprint | 0.62 mm × 0.32 mm - Reduces PCB area by >50% vs. standard SOD-323, critical for space-constrained mobile designs. |
Applications
| Smartphone Touch Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting capacitive touch controller I/O pins from ESD during user interaction and assembly handling. IC Role / Device Role / Timing Role: Bi-directional transient suppressor placed directly at connector or IC pad to clamp fast-rising ESD pulses before they reach sensitive analog front-end circuitry. Use Value: Prevents latch-up or permanent damage in touch controllers while maintaining <7 pF loading for accurate sensing resolution. | Use Scenario: Safeguarding D+ and D− lines of USB 2.0 ports against electrostatic discharge and cable-induced surges. IC Role / Device Role / Timing Role: Signal-line TVS placed adjacent to USB connector to shunt transients to ground with minimal parasitic impact on 480 Mbps data integrity. Use Value: Enables pass/fail compliance with IEC 61000-4-2 Level 4 without degrading eye diagram margin or bit error rate. |
| Industrial Keypad ESD Shielding | Portable GPS RF Front-End Protection |
Use Scenario: Securing membrane keypad scan lines in outdoor or factory-floor equipment exposed to repeated operator contact discharge. IC Role / Device Role / Timing Role: Single-line bidirectional protector mounted at each key trace entry to MCU GPIO, providing symmetrical clamping regardless of transient polarity. Use Value: Eliminates false keypresses and firmware resets caused by ESD-induced logic glitches in harsh industrial environments. | Use Scenario: Shielding GPS antenna feedline or baseband I/Q signal paths from ESD coupling through plastic enclosures or mounting brackets. IC Role / Device Role / Timing Role: Low-capacitance TVS placed between RF front-end IC and antenna switch to suppress transients without detuning matching networks. Use Value: Maintains GPS sensitivity and time-to-first-fix (TTFF) stability after ±20 kV contact discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | DO-214AC package (4.5 mm × 2.7 mm); 5.0 V VRWM; 10.8 V VCL @ 12.5 A; 100 pF CJ | Higher capacitance and larger footprint limit use on high-speed lines; suited for power rail or lower-frequency signal protection. | Select SMAJ5.0A only when board space permits and signal bandwidth is below 10 MHz. |
| TPD2E001DRYR | DFN 1.0 mm × 0.6 mm; dual-channel; 5.5 V VRWM; 12 V VCL @ 1 A; 3.5 pF CJ per channel | Offers two independent channels in same footprint; optimized for differential pairs like USB or HDMI; slightly higher VRWM. | Choose TPD2E001DRYR when protecting matched differential signals or requiring dual-line coverage in minimal area. |
Compared with SMAJ5.0A and TPD2E001DRYR, AOZ8251BDI-05 delivers the lowest capacitance (5–6.5 pF) and smallest footprint (0.62 × 0.32 mm) among single-line bi-directional TVS diodes rated for ±20 kV ESD, making it optimal for ultra-compact, high-speed interface protection where layout density and signal fidelity are critical.
Availability
AOZ8251BDI-05 is available at Aetrix Electronics and suitable for smartphone touch interfaces, USB 2.0 data line protection, and industrial keypad ESD shielding requiring stable component supply across high-volume production cycles.
Supply support for AOZ8251BDI-05 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 in computing, consumer, and industrial markets.
The AOZ8251BDI series was developed specifically for ultra-compact, high-fidelity ESD protection of high-speed signal lines in portable electronics, balancing low capacitance, fast response, and industry-leading ±20 kV ESD robustness.
FAQ
What is the maximum clamping voltage of AOZ8251BDI-05 under IEC 61000-4-5 surge conditions?
The AOZ8251BDI-05 exhibits a maximum clamping voltage of 18 V when subjected to a 4 A, 8/20 µs lightning surge per IEC 61000-4-5. This value is measured across the I/O-to-ground path and ensures downstream components remain within safe operating voltage limits during transient events. The clamping performance is guaranteed across the full -40°C to +125°C ambient temperature range, and AOZ8251BDI-05 maintains this specification without derating.
Does AOZ8251BDI-05 support bi-directional signal lines without polarity concerns?
Yes, AOZ8251BDI-05 is inherently bi-directional due to its symmetrical avalanche structure, allowing it to protect AC-coupled or floating signal lines without regard to DC bias polarity. It clamps equally for positive and negative transients on the I/O terminal relative to ground, making AOZ8251BDI-05 ideal for USB D+, D−, I²C SDA/SCL, and touch sensor lines where signal swing crosses ground.
What is the junction capacitance of AOZ8251BDI-05 and how does it affect high-speed signal integrity?
The junction capacitance of AOZ8251BDI-05 is 5–6.5 pF at 0 V and 1 MHz, verified per manufacturer characterization. This low value minimizes signal attenuation and timing skew on lines operating up to 480 Mbps (USB 2.0), preserving eye diagram opening and reducing bit error rates. AOZ8251BDI-05 achieves this without compromising ESD robustness, distinguishing it from higher-capacitance alternatives.
Can AOZ8251BDI-05 replace AOZ8251BDI-12 in a design?
No - AOZ8251BDI-05 and AOZ8251BDI-12 are not interchangeable due to differing electrical ratings: AOZ8251BDI-05 has 5 V VRWM and 4 A surge rating, while AOZ8251BDI-12 has 12 V VRWM and 1.5 A surge rating. Substituting AOZ8251BDI-05 for AOZ8251BDI-12 risks premature conduction on 12 V lines, and vice versa may fail to clamp low-voltage transients. AOZ8251BDI-05 must be used only where system operating voltage is ≤5 V.
Is AOZ8251BDI-05 compliant with RoHS and halogen-free standards?
Yes, AOZ8251BDI-05 is RoHS compliant and classified as an AOS Green Product, meaning it meets both RoHS Directive 2011/65/EU and halogen-free requirements (≤900 ppm bromine, ≤900 ppm chlorine, total ≤1500 ppm halogens). The DFN package uses lead-free terminations and conforms to JEDEC J-STD-020 moisture sensitivity level 1, and AOZ8251BDI-05 is qualified for reflow soldering per IPC/JEDEC J-STD-020.
AOZ8251BDI-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 0201 (0603 Metric)
- Series:
- -
- Packaging:
- Tape & Box (TB)
- Product Status:
- Not For New Designs
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- 5.5V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 5pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (0.62x0.32)
AOZ8251BDI-05 FAQ
1.How can I place an order for AOZ8251BDI-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8251BDI-05 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 AOZ8251BDI-05 reliable?
The price and inventory of AOZ8251BDI-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8251BDI-05 is usually 5 days.
3.What payment methods are accepted for AOZ8251BDI-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8251BDI-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8251BDI-05?
AOZ8251BDI-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8251BDI-05 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 AOZ8251BDI-05?
For technical support, including AOZ8251BDI-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8251BDI-05 requirements.
6.How does Aetrix verify that AOZ8251BDI-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8251BDI-05 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 AOZ8251BDI-05 meets industry standards.
7.What is the process for return or replacement of AOZ8251BDI-05?
All AOZ8251BDI-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8251BDI-05, 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 AOZ8251BDI-05 part is unused and in its original packaging.
Return procedure for AOZ8251BDI-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8251BDI-05 Tags
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