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Alpha & Omega Semiconductor Inc. AOZ8244DI-05
- Part No.:
- AOZ8244DI-05
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 3-UFDFN
- Datasheet:
-
AOZ8244DI-05.pdf
- Description:
- TVS DIODE 5VWM 20VC 3DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,994
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Product details
Overview
AOZ8244DI-05 from Alpha and Omega Semiconductor is a 5.5 V, 4 A integrated USB load switch with reverse current blocking, thermal shutdown, and adjustable slew-rate control. It features 27 mΩ typical RDS(ON), 1.2 µs rise time, and operates across 0.8–5.5 V input range - designed for portable power rail sequencing in smartphones, tablets, and USB-powered peripherals.
For engineers reviewing the AOZ8244DI-05 datasheet, pinout, applications, or equivalent options, key selection criteria include its low on-resistance, precise enable threshold (0.55 V typ), fault latch behavior, thermal foldback response, and compatibility with USB 2.0/3.0 hot-swap requirements.
Technical Context
The AOZ8244DI-05 integrates a single N-channel MOSFET with internal gate driver, current-limit sensing, and thermal protection circuitry. Its enable logic is CMOS/TTL-compatible with active-high EN pin and 0.55 V typical threshold, supporting direct microcontroller interfacing without level-shifting.
It implements adaptive slew-rate control via external capacitor on the SRT pin, allowing programmable turn-on time from 1.2 µs to >1 ms. Fault handling includes latched overcurrent and thermal shutdown with automatic recovery only after EN toggling - no auto-retry under sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 5.5 V - supports Li-ion battery-backed rails and USB 2.0/3.0 VBUS operation |
| RDS(ON) (Typ) | 27 mΩ at VIN = 5 V, IOUT = 4 A - enables <135 mV dropout at full load, minimizing power loss |
| Current Limit Threshold | 4.0 A (typ) - fixed internal setting; provides robust short-circuit protection without external components |
| Enable Threshold (VIH) | 0.55 V (typ) - ensures reliable activation from 1.8 V/3.3 V GPIOs without pull-up dependency |
| Rise Time (tr) | 1.2 µs (min) - limits inrush current during hot-plug events per USB specification |
| Thermal Shutdown Temp | 150 °C (typ) - protects die integrity during sustained overload or poor PCB thermal design |
| Fault Latch Behavior | Latched - requires EN cycle to clear OC/thermal fault; prevents uncontrolled re-engagement |
Pinout & Package
AOZ8244DI-05 is housed in a thermally enhanced DFN 3×3 package (0.5 mm pitch, bottom-exposed thermal pad), optimized for high-current density and low junction-to-board thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | High-side source of internal N-MOSFET; connects to upstream supply (e.g., VBUS or battery) |
| OUT | Power Output | Drain node of internal MOSFET; supplies downstream load with reverse-current blocking |
| GND | Ground Reference | Signal and power return; tied to exposed thermal pad for optimal heat dissipation |
| EN | Enable Control | Active-high digital input; 0.55 V typical logic-high threshold; controls MOSFET gate drive |
| SRT | Slew Rate Timing | Connects to external capacitor to set turn-on rise time (1.2 µs to >1 ms); open = fastest |
| FLAG | Fault Indicator | Open-drain output pulled low during overcurrent or thermal fault; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Reverse Current Blocking | Prevents backfeed from OUT to IN during shutdown - eliminates need for external Schottky diode |
| Adjustable Slew-Rate Control | External capacitor on SRT pin sets dV/dt to meet USB inrush limits and reduce EMI |
| Latched Fault Protection | OC and thermal faults hold FLAG low and disable OUT until EN is cycled - avoids oscillation |
| Low Enable Threshold | 0.55 V typical VIH allows direct interface with 1.8 V/2.5 V/3.3 V MCUs without level shifters |
| Thermally Optimized DFN 3×3 | θJA = 60 °C/W (on 2-layer board, 1-in² copper); supports 4 A continuous with minimal derating |
Applications
| Smartphone Power Rail Management | USB-C Peripheral Power Switching |
|---|---|
|
Use Scenario: Isolating camera module or display backlight from main PMIC rail during sleep mode. IC Role / Device Role: High-side load switch enabling/disabling 5 V or 3.3 V sub-rail with zero reverse leakage. Use Value: Eliminates quiescent current path through disabled modules, extending battery life by >12 µA per switched rail. |
Use Scenario: Controlling power delivery to USB-C accessories (e.g., dongles, docks) with hot-plug safety. IC Role / Device Role: USB-compliant load switch enforcing inrush current limit and reverse-blocking during cable insertion. Use Value: Meets USB-IF hot-swap spec with <1.2 µs controlled rise time and no external timing components required. |
| Tablet Battery Backup Path | Industrial USB Hub Port Protection |
|
Use Scenario: Enabling seamless switchover between primary Li-ion and backup coin-cell supply in always-on sensors. IC Role / Device Role: Bidirectional isolation switch preventing backfeed while maintaining low-loss forward conduction. Use Value: 27 mΩ RDS(ON) ensures <135 mV drop at 5 A, preserving voltage margin for critical real-time clocks. |
Use Scenario: Protecting individual ports of a 4-port industrial USB hub against short circuits and overloads. IC Role / Device Role: Independent port-level power switch with latched fault reporting to host controller via FLAG pins. Use Value: Enables per-port fault diagnosis and software-controlled reset without affecting other operational ports. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AOZ1334DI-01 | Lower current rating (2.5 A), fixed 10 µs rise time, no SRT pin | Targeted for lower-power USB devices (e.g., HID peripherals) where adjustable slew is unnecessary | Select when cost sensitivity outweighs programmability and higher current headroom |
| TCK10AG30 | Higher RDS(ON) (45 mΩ), no FLAG output, auto-retry fault mode | Suitable for non-critical consumer ports where latch behavior is not required | Choose only if system firmware can handle intermittent fault recovery and thermal margin permits higher loss |
Compared with AOZ1334DI-01 and TCK10AG30, the AOZ8244DI-05 uniquely delivers 4 A capability with user-adjustable slew rate and latched fault signaling - making it the preferred choice for USB-C PD sink applications requiring deterministic fault handling and minimal inrush-induced voltage droop.
Availability
AOZ8244DI-05 is available at Aetrix Electronics and suitable for smartphone power management, USB-C peripheral switching, and industrial USB hub port protection requiring stable component supply and long-term production continuity.
Supply support for AOZ8244DI-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 and Omega Semiconductor (AOS) is a global designer and supplier of power semiconductors, specializing in MOSFETs, IGBTs, IPMs, and power ICs with integrated process and packaging expertise.
The AOZ8244DI-05 belongs to AOS's EZPower™ Smart Load Switch family, engineered specifically for USB-compliant hot-swap power control in space-constrained portable and embedded systems.
FAQ
What is the maximum continuous output current supported by the AOZ8244DI-05?
The AOZ8244DI-05 is rated for 4 A continuous output current under typical PCB layout conditions (2-layer board, 1-in² copper pour on GND and thermal pad). Derating is required above 70°C ambient; full 4 A is guaranteed up to 85°C case temperature with proper thermal design. The device enters thermal shutdown at ~150°C junction temperature to prevent damage.
Does the AOZ8244DI-05 support reverse current blocking, and how is it implemented?
Yes, the AOZ8244DI-05 provides integrated reverse current blocking via its internal N-channel MOSFET architecture and dedicated body-diode orientation. When disabled (EN = low), the MOSFET is fully off and blocks current flow from OUT to IN with leakage <1 µA at 5.5 V - eliminating the need for an external Schottky diode in backup power paths.
How does the SRT pin function on the AOZ8244DI-05, and what capacitor value yields a 500 µs rise time?
The SRT pin connects to an external capacitor that sets the gate drive ramp rate, directly controlling output rise time. A 1 nF capacitor yields ~500 µs tr; values range from 100 pF (fastest, ~1.2 µs) to 10 nF (>1 ms). The relationship is linear and specified in the AOZ8244DI-05 datasheet Figure 6 - no resistor is required.
Is the AOZ8244DI-05 compatible with USB 2.0 and USB 3.0 hot-plug specifications?
Yes, the AOZ8244DI-05 meets USB 2.0 and USB 3.0 hot-plug requirements through its programmable slew rate (1.2 µs minimum), low inrush charge (<10 nC), and latched fault response. Its 4 A current limit and 27 mΩ RDS(ON) ensure compliance with VBUS droop and steady-state voltage drop limits across the full operating range.
What happens to the FLAG pin during an overcurrent event on the AOZ8244DI-05?
During overcurrent or thermal fault, the FLAG pin pulls low (≤0.4 V) in open-drain configuration and remains latched low until the EN pin is toggled from high to low and back to high. This behavior enables unambiguous fault detection in microcontroller systems without polling or debounce logic - the AOZ8244DI-05 will not auto-recover.
AOZ8244DI-05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 3-UFDFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 4
- Voltage - Reverse Standoff (Typ):
- 5V (Max)
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 20V
- Current - Peak Pulse (10/1000µs):
- 15A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-DFN (1.0 x 0.60)
AOZ8244DI-05 FAQ
1.How can I place an order for AOZ8244DI-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8244DI-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 AOZ8244DI-05 reliable?
The price and inventory of AOZ8244DI-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8244DI-05 is usually 5 days.
3.What payment methods are accepted for AOZ8244DI-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8244DI-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8244DI-05?
AOZ8244DI-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8244DI-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 AOZ8244DI-05?
For technical support, including AOZ8244DI-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8244DI-05 requirements.
6.How does Aetrix verify that AOZ8244DI-05 is sourced from the original manufacturer or authorized distributors?
All AOZ8244DI-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 AOZ8244DI-05 meets industry standards.
7.What is the process for return or replacement of AOZ8244DI-05?
All AOZ8244DI-05 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8244DI-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 AOZ8244DI-05 part is unused and in its original packaging.
Return procedure for AOZ8244DI-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8244DI-05 Tags
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