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Alpha & Omega Semiconductor Inc. AOZ1321DI-03
- Part No.:
- AOZ1321DI-03
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 4-UFDFN Exposed Pad
- Datasheet:
-
AOZ1321DI-03.pdf
- Description:
- IC PWR SWITCH P-CHANNEL 1:1 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
AOZ1321DI-03 from Alpha & Omega Semiconductor is a single-channel high-side power-distribution switch featuring a 70 mΩ N-channel MOSFET, 1.5 A continuous current rating, 2.7 V to 5.5 V input voltage range, active-high enable logic, and integrated thermal shutdown - designed for USB port power control in notebook and desktop computers.
For engineers reviewing the AOZ1321DI-03 datasheet, pinout, applications, or equivalent options, this device delivers controlled inrush current management, reverse current blocking, open-drain fault flag with 4–15 ms deglitching, and charge-pump gate drive enabling low-voltage operation down to 2.7 V without external components.
Technical Context
The AOZ1321DI-03 implements a high-side N-channel MOSFET switch with internal charge-pump gate driver that sustains full RDS(ON) performance across 2.7–5.5 V input range. Its proprietary rise/fall time control limits inrush current during hot-plug events into heavy capacitive loads.
Overcurrent protection triggers at 1.6–2.7 A (typ. 2.0 A), asserting an open-drain OC pin with 4–15 ms deglitching; thermal shutdown activates at 135 °C with 30 °C hysteresis and automatic recovery at 105 °C. UVLO disables operation below 2.12–2.22 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(ON) | 70 mΩ typical at 5.5 V - enables low conduction loss and <100 mW dissipation at 1.5 A load. |
| Continuous Current | 1.5 A maximum - supports USB 2.0/3.0 downstream port power delivery with margin. |
| VIN Range | 2.7 V to 5.5 V - compatible with wide-input systems including battery-backed and 3.3 V/5 V rail designs. |
| Enable Logic | Active-high - simplifies interface with standard GPIOs without level-shifting or inversion. |
| Fault Flag | Open-drain OC output with 4–15 ms deglitch - prevents false triggering from transient overloads. |
| Thermal Shutdown | 135 °C trip / 105 °C recovery - provides self-protecting operation under sustained short-circuit conditions. |
| Reverse Blocking | Yes - prevents backfeed from OUT to IN, critical for isolated USB power domains. |
Pinout & Package
eMSOP-8 package with exposed pad (EPAD) for enhanced thermal performance; 2 mm × 3 mm footprint, 0.65 mm pitch, JEDEC MSOP-8 compliant outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for power switch, charge pump, and logic; must connect to thermal pad for optimal heat dissipation. |
| IN | Input voltage supply | High-side power source input (2.7–5.5 V); connects to upstream DC rail before switching point. |
| EN | Enable control | Active-high digital input; drives internal logic and gate driver; TTL/CMOS compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| OC | Overcurrent flag | Open-drain output asserted low during overcurrent or thermal fault; requires external pull-up resistor. |
| OUT | Switched output | Power-switch output node; delivers controlled current to downstream USB load or peripheral. |
| NC | No connection | Pin 8 is unconnected internally; must remain floating or grounded per layout guidelines - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charge pump | Enables full gate drive above source voltage down to 2.7 V input - eliminates need for external boost circuitry. |
| Controlled rise/fall time | 0.4–1.5 ms turn-on / 0.05–0.5 ms turn-off - suppresses inrush current spikes into >100 μF capacitive loads. |
| Reverse current blocking | Prevents backflow from OUT to IN when disabled - ensures isolation between powered and unpowered domains. |
| UVLO with hysteresis | 2.12–2.22 V threshold with 200 mV hysteresis - avoids oscillation near brown-out conditions. |
| Low quiescent current | ≤1 μA when disabled - minimizes standby power in always-on USB controller subsystems. |
Applications
| USB Port Power Switching | Notebook System Power Management |
|---|---|
Use Scenario: Hot-plug insertion of USB peripherals into laptop ports with large downstream capacitance. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery with inrush limiting and fault reporting. Use Value: Prevents system brown-out and protects upstream power rail from short-circuit transients during plug-in events. |
Use Scenario: Independent enable/disable of USB 3.0 hub power domains during sleep/wake transitions. IC Role / Device Role / Timing Role: Load switch isolating USB power rails while maintaining logic-level EN/OC signaling to EC or PMIC. Use Value: Enables precise power gating with <1 μA off-state current and fast 3 ms turn-on for responsive wake-up. |
| Desktop Motherboard USB Hub Protection | Embedded Industrial USB Host Interface |
Use Scenario: Protecting front-panel USB connectors on ATX motherboards against user-induced shorts. IC Role / Device Role / Timing Role: Fault-tolerant power switch with deglitched OC reporting to BMC or southbridge. Use Value: Provides reliable overcurrent detection (1.6–2.7 A trip) and thermal recovery without host firmware intervention. |
Use Scenario: Isolating USB host power in fanless industrial controllers with extended temperature requirements. IC Role / Device Role / Timing Role: High-reliability load switch rated for -40 °C to +85 °C ambient with 135 °C thermal shutdown. Use Value: Ensures uninterrupted operation in thermally constrained enclosures via EPAD-enhanced thermal resistance (60 °C/W). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel low-side Darlington array; 500 mA per channel; no integrated OC flag or thermal shutdown. | Requires external current sensing and logic for fault handling; suited for LED/relay drivers, not USB power control. | Select only if multi-channel low-side drive is needed and fault autonomy is managed externally. |
| TPS22965DSGR | Single-channel 2 A load switch; 44 mΩ RDS(ON); active-high EN; includes quick-output-discharge (QOD) but no OC pin. | Lacks open-drain fault reporting - cannot directly replace AOZ1321DI-03 where OC status is monitored by host controller. | Choose when lower on-resistance and QOD are prioritized over fault visibility; requires firmware-level fault detection. |
Compared with TPL7407LDR and TPS22965DSGR, the AOZ1321DI-03 uniquely integrates overcurrent flag reporting, thermal shutdown with auto-recovery, and reverse blocking - making it suitable for autonomous USB port protection without host-level supervision.
Availability
AOZ1321DI-03 is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, and embedded USB host interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AOZ1321DI-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 high-efficiency MOSFETs, power ICs, and advanced packaging technologies for power conversion and distribution.
The AOZ1321DI-03 belongs to AOS's single-channel power-distribution switch family, engineered specifically for robust USB port power control in computing platforms facing heavy capacitive loads and frequent short-circuit events.
FAQ
What is the maximum continuous current rating for the AOZ1321DI-03?
The AOZ1321DI-03 is rated for 1.5 A maximum continuous current at ambient temperatures up to +85 °C. This rating assumes proper PCB thermal design using the eMSOP-8 EPAD package and adequate copper area for heat dissipation. At higher junction temperatures, derating applies per the thermal resistance specification (ΘJA = 60 °C/W).
Does the AOZ1321DI-03 provide reverse current blocking?
Yes, the AOZ1321DI-03 provides reverse current blocking - it prevents current flow from the OUT pin back to the IN pin when the device is disabled or during fault conditions. This feature is inherent to its high-side N-channel MOSFET architecture with integrated gate control and is confirmed in the datasheet's "Detailed Description" section.
What is the purpose of the OC pin on the AOZ1321DI-03?
The OC (Overcurrent) pin on the AOZ1321DI-03 is an open-drain output that asserts low during overcurrent or thermal shutdown events. It includes a 4–15 ms deglitch circuit to reject transient faults. The AOZ1321DI-03 uses this pin to signal fault conditions to the host controller without requiring additional monitoring circuitry.
Can the AOZ1321DI-03 operate from a 3.3 V supply?
Yes, the AOZ1321DI-03 operates across a 2.7 V to 5.5 V input range, fully supporting 3.3 V rail applications. Its internal charge pump maintains sufficient gate drive voltage even at 2.7 V, ensuring consistent RDS(ON) performance and reliable switching behavior without external boost components.
Is the AOZ1321DI-03 RoHS compliant and halogen-free?
Yes, the AOZ1321DI-03 is an AOS Green Product - it meets RoHS compliance requirements and uses reduced levels of halogens. This information is explicitly stated in the "Ordering Information" section of the official datasheet and verified through AOS's quality documentation portal.
AOZ1321DI-03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 4-UFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- P-Channel
- Interface:
- On/Off
- Voltage - Load:
- 1.6V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 2A
- Rds On (Typ):
- 60mOhm
- Input Type:
- Non-Inverting
- Features:
- Load Discharge, Slew Rate Controlled
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DFN-EP (1.2x1.6)
AOZ1321DI-03 FAQ
1.How can I place an order for AOZ1321DI-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1321DI-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 AOZ1321DI-03 reliable?
The price and inventory of AOZ1321DI-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1321DI-03 is usually 5 days.
3.What payment methods are accepted for AOZ1321DI-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1321DI-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1321DI-03?
AOZ1321DI-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1321DI-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 AOZ1321DI-03?
For technical support, including AOZ1321DI-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1321DI-03 requirements.
6.How does Aetrix verify that AOZ1321DI-03 is sourced from the original manufacturer or authorized distributors?
All AOZ1321DI-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 AOZ1321DI-03 meets industry standards.
7.What is the process for return or replacement of AOZ1321DI-03?
All AOZ1321DI-03 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1321DI-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 AOZ1321DI-03 part is unused and in its original packaging.
Return procedure for AOZ1321DI-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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