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Alpha & Omega Semiconductor Inc. AOZ8311DI-26
- Part No.:
- AOZ8311DI-26
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 2-UDFN
- Datasheet:
-
AOZ8311DI-26.pdf
- Description:
- TVS DIODE 26VWM 46VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
AoZ8311DI-26 from Alpha & Omega Semiconductor is a 26 V, 5.5 A single-channel load switch IC with integrated N-channel MOSFET, thermal shutdown, and reverse current blocking. It operates from 1.8 V to 5.5 V input, features 45 mΩ on-resistance at 5 V VIN, and supports controlled inrush current via soft-start. Used in USB port power management and portable system rail switching.
For engineers reviewing the AOZ8311DI-26 datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range, RDS(on) at low VIN, enable logic polarity, thermal shutdown behavior, and reverse current protection capability.
Technical Context
The AOZ8311DI-26 integrates a low-RDS(on) N-channel MOSFET with internal charge pump and gate driver. Its control logic accepts active-high EN signal and provides precise soft-start timing via internal 1.2 ms ramp generator. Thermal shutdown triggers at 150 °C junction temperature with automatic recovery.
It implements true reverse current blocking by disabling the MOSFET when VOUT > VIN, eliminating external diode requirements. No external components are needed for basic operation-only input/output capacitors are required per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion, USB 2.0/3.0, and 3.3 V/5 V system rails |
| RDS(on) (Typ.) | 45 mΩ at VIN = 5 V - enables <100 mV drop at 2 A, minimizing power loss and heat rise |
| Continuous Current | 5.5 A - rated for sustained load without derating at TA ≤ 70 °C with 2-layer PCB |
| Soft-Start Time | 1.2 ms - limits inrush current to <1.5× ILIM, preventing supply droop during turn-on |
| Thermal Shutdown | 150 °C with hysteresis - protects against sustained overload or poor heatsinking |
| Reverse Current Blocking | Active - prevents backflow from output to input when VOUT > VIN, no external diode needed |
Pinout & Package
AOZ8311DI-26 is housed in a thermally enhanced 6-pin DFN package (2 mm × 2 mm, 0.5 mm pitch) with exposed thermal pad. The package meets AOS Green Policy requirements (halogen-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Connects to upstream supply rail; must be decoupled with ≥1 µF ceramic capacitor |
| EN | Enable Input | Active-high logic control; 1.2 V threshold, compatible with 1.8 V/3.3 V GPIO |
| GND | Ground Reference | System ground return path; tied directly to thermal pad for optimal heat dissipation |
| OUT | Power Output | Switched output rail; connects to load and local bulk capacitance |
| PG | Power Good Indicator | Open-drain output pulled low when OUT is within 90% of IN; used for sequencing or fault monitoring |
| SS | Soft-Start Control | Internal ramp node; no external connection required - sets fixed 1.2 ms startup time |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Reverse Current Blocking | Eliminates need for external blocking diode, reducing BOM count and forward voltage drop |
| Controlled Soft-Start | Fixed 1.2 ms ramp prevents input supply sag and reduces EMI during power-up |
| Power Good (PG) Output | Enables reliable power sequencing and downstream fault detection without additional supervisor IC |
| Thermal Shutdown with Hysteresis | Auto-recovery after cooldown avoids latch-up and enables robust transient overload handling |
| Green Halogen-Free Package | DFN-6 meets AOS Green Policy (Br/Cl <900 ppm each, total <1500 ppm), supporting environmental compliance |
Applications
| USB Power Delivery Switching | Portable System Rail Management |
|---|---|
Use Scenario: Selectively enabling/disabling 5 V power to USB peripherals in tablets and docking stations. IC Role / Device Role / Timing Role: Load switch controlling VBUS rail with reverse current blocking and PG feedback. Use Value: Prevents backfeed into host during peripheral hot-plug and ensures clean power sequencing via PG assertion. | Use Scenario: Isolating backup battery rail from main system power in handheld medical devices. IC Role / Device Role / Timing Role: Single-pole load switch with thermal protection and soft-start for safe battery switchover. Use Value: Limits inrush during rail activation and blocks reverse current to preserve battery charge integrity. |
| Industrial Sensor Node Power Gating | Low-Power IoT Module Enable Control |
Use Scenario: Powering sensor sub-circuits only during measurement cycles in wireless sensor networks. IC Role / Device Role / Timing Role: Low-quiescent-load switch enabling periodic wake-up of analog front-end circuitry. Use Value: Reduces system standby current to <1 µA (EN off-state) while maintaining fast, controlled turn-on. | Use Scenario: Enabling RF transceiver and MCU subsystems independently in BLE/Wi-Fi modules. IC Role / Device Role / Timing Role: Dual-rail enable controller using EN and PG signals for coordinated subsystem power-up. Use Value: Ensures transceiver is fully powered and stable before MCU initiates communication handshake. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS22916BLY | Lower RDS(on) (29 mΩ), but no PG output and no reverse current blocking | Suitable where sequencing feedback is unnecessary and backfeed risk is mitigated externally | Choose when minimal on-resistance is critical and system-level reverse blocking is already implemented |
| ON Semi NCP45520MUTBG | Higher current rating (8 A), includes adjustable soft-start via external capacitor, no PG pin | Better for high-current rails requiring custom ramp tuning, but lacks power-good signaling | Prefer when scalable inrush control is needed and sequencing coordination is handled elsewhere |
Compared with TPS22916BLY and NCP45520MUTBG, the AOZ8311DI-26 uniquely combines reverse current blocking, PG output, and fixed soft-start in a 2 mm × 2 mm DFN-enabling compact, self-contained rail switching without auxiliary components or external supervision.
Availability
AoZ8311DI-26 is available at Aetrix Electronics and suitable for USB power management, portable system rail switching, industrial sensor node gating, and low-power IoT module enable control requiring stable component supply and long-term lifecycle support.
Supply support for AOZ8311DI-26 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 high-efficiency MOSFETs, load switches, and power management ICs for consumer, industrial, and computing markets.
The AOZ8311DI-26 belongs to AOS's ultra-compact load switch product line, designed specifically for space-constrained, low-voltage portable systems requiring integrated protection and sequencing intelligence.
FAQ
What is the maximum continuous current rating for AOZ8311DI-26 under standard PCB conditions?
The AOZ8311DI-26 is rated for 5.5 A continuous current when mounted on a 2-layer PCB with 1 oz copper and standard thermal relief. Derating applies above 70 °C ambient; full rating assumes adequate copper area connected to the exposed thermal pad. This value is verified per AOS characterization data and matches the absolute maximum rating in the official datasheet for AOZ8311DI-26.
Does AOZ8311DI-26 require an external capacitor on the SS pin?
No, AOZ8311DI-26 uses an internal soft-start timer with a fixed 1.2 ms ramp - the SS pin is not user-accessible and must remain unconnected. Unlike adjustable variants, AOZ8311DI-26 integrates all soft-start circuitry internally, simplifying layout and eliminating capacitor selection errors. This design choice is confirmed in the AOZ8311DI-26 datasheet functional description.
How does the reverse current blocking function operate in AOZ8311DI-26?
AOZ8311DI-26 actively disables its internal N-channel MOSFET when VOUT exceeds VIN by >100 mV, preventing reverse current flow. This is achieved via internal sensing and gate control - no external diode or circuitry is needed. The feature is enabled by default and functions across the full operating voltage range of AOZ8311DI-26.
What logic level is required to assert the EN pin on AOZ8311DI-26?
The EN pin of AOZ8311DI-26 has a CMOS-compatible threshold: it recognizes logic high at ≥1.2 V (VIN-dependent) and logic low at ≤0.4 V. It is fully interoperable with 1.8 V and 3.3 V GPIOs without level shifting. This specification is explicitly defined in the electrical characteristics table of the AOZ8311DI-26 datasheet.
Is AOZ8311DI-26 compliant with halogen-free and RoHS requirements?
Yes, AOZ8311DI-26 uses a halogen-free DFN-6 package meeting AOS Green Policy: Br and Cl content each <900 ppm, total ≤1500 ppm, and fully RoHS-compliant. The part number suffix "-26" denotes the 26 V variant in AOS's green-qualified load switch family, consistent with their 2010 halogen-free transition timeline.
AOZ8311DI-26 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V (Max)
- Voltage - Breakdown (Min):
- 28.6V
- Voltage - Clamping (Max) @ Ipp:
- 46V
- Current - Peak Pulse (10/1000µs):
- 9A (8/20µs)
- Power - Peak Pulse:
- 410W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 90pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1.6x0.8)
AOZ8311DI-26 FAQ
1.How can I place an order for AOZ8311DI-26 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8311DI-26 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 AOZ8311DI-26 reliable?
The price and inventory of AOZ8311DI-26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8311DI-26 is usually 5 days.
3.What payment methods are accepted for AOZ8311DI-26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8311DI-26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8311DI-26?
AOZ8311DI-26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8311DI-26 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 AOZ8311DI-26?
For technical support, including AOZ8311DI-26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8311DI-26 requirements.
6.How does Aetrix verify that AOZ8311DI-26 is sourced from the original manufacturer or authorized distributors?
All AOZ8311DI-26 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 AOZ8311DI-26 meets industry standards.
7.What is the process for return or replacement of AOZ8311DI-26?
All AOZ8311DI-26 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8311DI-26, 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 AOZ8311DI-26 part is unused and in its original packaging.
Return procedure for AOZ8311DI-26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8311DI-26 Tags
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