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Alpha & Omega Semiconductor Inc. AOZ1321DI-01
- Part No.:
- AOZ1321DI-01
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package:
- 4-UFDFN Exposed Pad
- Datasheet:
-
AOZ1321DI-01.pdf
- Description:
- IC PWR SWITCH P-CHANNEL 1:1 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
AOZ1321DI-01 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 open-drain overcurrent fault flag - designed for USB power switching in notebook and desktop computers.
For engineers reviewing the AOZ1321DI-01 datasheet, pinout, applications, or equivalent options, this device delivers controlled inrush current management, thermal shutdown protection, reverse current blocking, and deglitched fault reporting in compact eMSOP-8 packaging.
Technical Context
The AOZ1321DI-01 integrates an internal charge pump enabling gate drive above VIN to fully enhance the N-channel MOSFET, supporting operation down to 2.7 V while maintaining low RDS(ON). Its proprietary driver circuitry controls output rise/fall times (0.4–1.5 ms rise, 0.05–0.5 ms fall) to suppress inrush surges during hot-plug events.
It implements overcurrent detection with 1.6–2.7 A trip threshold and 4–15 ms deglitch timing, plus thermal shutdown at 135 °C with 30 °C hysteresis. The device operates as a high-side switch with reverse current blocking and undervoltage lockout (2.5 V rising threshold, 200 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(ON) | 70 mΩ typical at 5.5 V VIN - 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 bus-powered peripheral switching without derating. |
| VIN Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V rail systems. |
| Fault Flag | Open-drain OC output with 4–15 ms deglitch - prevents false triggering during transient load spikes. |
| Enable Logic | Active-high EN input - TTL/CMOS-compatible, reduces supply current to ~1 μA when disabled. |
| Thermal Shutdown | 135 °C trip with 30 °C hysteresis - ensures safe recovery after short-circuit removal without manual reset. |
| Reverse Blocking | Yes - prevents backfeed from OUT to IN, critical for isolated USB port power domains. |
Pinout & Package
eMSOP-8 package with exposed pad (EPAD MSOP-8), 3.0 mm × 3.0 mm footprint, ΘJA = 60 °C/W - optimized for thermal performance in space-constrained USB hub designs.
| 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 heat dissipation. |
| IN | Input voltage supply | Connects to upstream 2.7–5.5 V rail; supplies both power switch and internal charge pump. |
| EN | Enable control input | Logic-high signal (>2.0 V) activates switch; logic-low disables all circuitry, reducing quiescent current to ~1 μA. |
| OC | Overcurrent fault flag | Open-drain output asserted low during overcurrent or thermal shutdown; requires external pull-up resistor. |
| OUT | Switched output | Delivers controlled power to downstream USB load; features reverse current blocking when disabled. |
| NC | No connection | Pin 8 is unconnected internally - must be left floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charge pump | Enables full enhancement of N-channel MOSFET from 2.7 V input - eliminates need for external boost circuitry. |
| Controlled slew rate | Rise time 0.4–1.5 ms and fall time 0.05–0.5 ms - limits inrush current to prevent system rail droop during hot-plug. |
| Reverse current blocking | Prevents backflow from OUT to IN when disabled - essential for preventing cross-port power contention in multi-port hubs. |
| Deglitched OC flag | 4–15 ms blanking window on OC assertion - rejects transient overloads (e.g., capacitor charging) without false fault latching. |
| UVLO protection | 2.5 V rising threshold with 200 mV hysteresis - prevents erratic switching during brown-out conditions. |
Applications
| USB 2.0 Hub Power Switching | Notebook USB Port Protection |
|---|---|
|
Use Scenario: Isolating individual downstream USB ports in a 4-port hub to prevent one faulty device from collapsing the entire VBUS rail. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery per port, with fast OC response (<15 ms) and automatic thermal recovery. Use Value: Enables per-port current limiting and fault isolation without requiring host controller intervention or firmware overhead. |
Use Scenario: Protecting the main system VBUS rail from short circuits caused by damaged cables or peripherals plugged into user-accessible USB-A ports. IC Role / Device Role / Timing Role: Primary USB power distribution switch with reverse current blocking and 1.5 A continuous rating. Use Value: Prevents backfeed into the system during sleep states and avoids system-wide resets due to downstream shorts. |
| Desktop Motherboard USB Controller Interface | External USB 3.0 Docking Station |
|
Use Scenario: Providing clean, sequenced power to USB 3.0 controller ICs and associated SuperSpeed signal conditioning circuitry. IC Role / Device Role / Timing Role: Controlled power enable with precise rise/fall timing to meet USB specification voltage ramp requirements. Use Value: Eliminates voltage overshoot and undershoot during power-on, ensuring reliable enumeration of high-speed peripherals. |
Use Scenario: Managing power delivery to multiple high-capacitance loads (HDDs, SSDs, displays) connected via USB-C alternate mode. IC Role / Device Role / Timing Role: High-current (1.5 A) distribution switch with thermal shutdown and OC flag for system-level fault logging. Use Value: Supports hot-plug of storage devices while providing real-time fault visibility to dock firmware via OC pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side USB power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AOZ1312EI-1 | Same SO-8/eMSOP-8 family; identical RDS(ON), current rating, and feature set; differs only in marking and minor revision. | No functional difference - AOZ1312EI-1 is documented as pin- and function-compatible with AOZ1321DI-01 in AOS ordering tables. | Select AOZ1312EI-1 if SO-8 footprint is preferred or for legacy design continuity. |
| TUSB2036IPW | Integrated USB 2.0 hub controller + power switches; includes built-in transceivers, PLL, and configuration EEPROM - not a discrete switch. | Replaces discrete switch + microcontroller logic; adds protocol-aware control but increases BOM count and layout complexity. | Choose TUSB2036IPW only when full hub functionality (4 downstream ports, suspend/resume, enumeration) is required. |
Compared with AOZ1321DI-01, AOZ1312EI-1 offers identical electrical behavior in eMSOP-8 packaging, while TUSB2036IPW embeds switching within a full hub IC - making AOZ1321DI-01 optimal for discrete, low-overhead USB power control where protocol handling resides elsewhere.
Availability
AOZ1321DI-01 is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, and USB docking stations requiring stable component supply, RoHS-compliant green packaging, and production-ready lead times.
Supply support for AOZ1321DI-01 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 for power management applications.
The AOZ13xx family - including AOZ1321DI-01 - was designed specifically for robust, low-RDS(ON) USB and general-purpose power distribution switching in consumer and computing platforms.
FAQ
What is the maximum continuous current rating for AOZ1321DI-01?
The AOZ1321DI-01 is rated for 1.5 A maximum continuous current at ambient temperatures up to +85 °C. This rating assumes proper PCB thermal design with the EPAD soldered to a sufficient copper area. At higher junction temperatures, derating applies per the thermal resistance (ΘJA = 60 °C/W for eMSOP-8) and power dissipation equation PD = RDS(ON) × I².
Does AOZ1321DI-01 support reverse current blocking?
Yes, AOZ1321DI-01 provides inherent reverse current blocking when disabled - it prevents current flow from OUT to IN. This is achieved by the high-side N-channel MOSFET configuration and gate drive architecture. The datasheet confirms this behavior under "Power Switch" and "Detailed Description" sections, specifying no backfeed during disable state.
What is the purpose of the OC pin on AOZ1321DI-01?
The OC (Overcurrent) pin on AOZ1321DI-01 is an open-drain, active-low fault flag that asserts during overcurrent events (1.6–2.7 A trip threshold) or thermal shutdown. It includes a 4–15 ms deglitch circuit to reject transient spikes. The pin requires an external pull-up resistor and interfaces directly with host microcontrollers or PMICs for system-level fault monitoring and recovery sequencing.
Can AOZ1321DI-01 operate from a 3.3 V supply?
Yes, AOZ1321DI-01 operates across 2.7 V to 5.5 V input voltage range. At 3.3 V, the internal charge pump maintains sufficient gate drive to keep RDS(ON) near its specified 70 mΩ typical value, and all protections (UVLO, OC, thermal shutdown) remain fully functional. Electrical characteristics tables confirm performance at VIN = 3.3 V across multiple parameters.
Is AOZ1321DI-01 pin-compatible with AOZ1312EI-1?
Yes, AOZ1321DI-01 and AOZ1312EI-1 share identical pin configuration, electrical specifications, and functional behavior in eMSOP-8 packaging. The AOS ordering table explicitly lists both part numbers under the same package type and performance column, confirming pin-to-pin and functionally equivalent status for design reuse and second-source flexibility.
AOZ1321DI-01 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-01 FAQ
1.How can I place an order for AOZ1321DI-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ1321DI-01 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-01 reliable?
The price and inventory of AOZ1321DI-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ1321DI-01 is usually 5 days.
3.What payment methods are accepted for AOZ1321DI-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ1321DI-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ1321DI-01?
AOZ1321DI-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ1321DI-01 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-01?
For technical support, including AOZ1321DI-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ1321DI-01 requirements.
6.How does Aetrix verify that AOZ1321DI-01 is sourced from the original manufacturer or authorized distributors?
All AOZ1321DI-01 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-01 meets industry standards.
7.What is the process for return or replacement of AOZ1321DI-01?
All AOZ1321DI-01 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ1321DI-01, 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-01 part is unused and in its original packaging.
Return procedure for AOZ1321DI-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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