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Alpha & Omega Semiconductor Inc. AOI444
- Part No.:
- AOI444
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- TO-251-3 Stub Leads, IPAK
- Datasheet:
-
AOI444.pdf
- Description:
- MOSFET N-CH 60V 4A/12A TO251A
- Quantity:
- Payment:
- Shipping:
Inventory:3,591
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Product details
Overview
AOI444 from Alpha & Omega Semiconductor is a 60V N-Channel Trench MOSFET in TO-251A (IPAK) package, rated for 12A continuous drain current at VGS=10V, with RDS(ON) < 60 mΩ at VGS=10V and < 85 mΩ at VGS=4.5V, used in PWM motor control, DC-DC synchronous rectification, and industrial load switching.
For engineers reviewing the AOI444 datasheet, pinout, applications, or equivalent options, key selection criteria include its 100% UIS-tested ruggedness, low gate charge (Qg=10 nC @ 10V), 175°C max junction temperature, and suitability for high-efficiency, thermally constrained power stages.
Technical Context
The AOI444 employs advanced trench-gate silicon technology to achieve low RDS(ON) and fast switching with Qg=10 nC (10V) and Qgd=1.9 nC. Its SOA supports single-pulse operation up to 100W with TC=25°C and features 100% Rg testing for gate robustness.
Thermal design is enabled by RθJC=7.5°C/W and RθJA=60°C/W (1 in² FR-4, 2 oz Cu), with current derating to 9A at TC=100°C. The integrated body diode has trr=35 ns and Qrr=30 nC under IF=12A, dI/dt=100 A/μs conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 60 V - Maximum blocking voltage for 24–48V bus applications without avalanche stress. |
| ID (VGS=10V) | 12 A - Continuous conduction capability at TC=25°C, enabling compact 15W–20W power stages. |
| RDS(ON) (VGS=10V) | < 60 mΩ - Low conduction loss yielding ≤0.86 W I²R loss at 12A, reducing thermal footprint. |
| Qg (10V) | 10 nC - Enables efficient 500 kHz–1 MHz switching with moderate gate driver strength (e.g., 1A peak). |
| tr/tf | 3.4 ns / 2 ns - Fast edge rates support high-frequency PWM with minimal switching loss and EMI. |
| EAS | 100 mJ - 100% unclamped inductive switching tested, ensuring reliability in relay/snubberless inductive loads. |
| TJ max | 175 °C - Allows operation in sealed enclosures or high ambient environments without derating penalty. |
Pinout & Package
AOI444 is housed in TO-251A (IPAK) surface-mount package with exposed drain pad for thermal enhancement. Pin assignment is Gate (G), Drain (D), Source (S) - standard three-terminal configuration with D as tab-connected terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate Control Input | Receives PWM signal; requires 10V drive for full enhancement; Rg=1.4 Ω typical ensures stable turn-on/turn-off timing. |
| D | Drain Current Terminal | High-side or low-side switch node; electrically connected to exposed copper pad for PCB heat sinking. |
| S | Source Reference Node | Return path for load current; ties to ground or low-side shunt; defines VGS reference for gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| 100% UIS Tested | Guarantees survival under unclamped inductive turn-off events up to 100 mJ, eliminating need for external snubbers in solenoid/relay drivers. |
| Low RDS(ON) at 4.5V | RDS(ON) < 85 mΩ enables logic-level drive compatibility with 3.3V/5V microcontrollers in battery-powered systems. |
| Fast Body Diode Recovery | trr=35 ns and Qrr=30 nC minimize reverse recovery loss and shoot-through risk in synchronous buck converters. |
| Enhanced Thermal Performance | RθJC=7.5°C/W allows >15W dissipation with modest heatsinking, supporting high-density power modules. |
| 100% Rg Tested | Ensures gate oxide integrity and consistent switching behavior across production lots, critical for automotive-grade reliability. |
Applications
| Brushed DC Motor Control | Synchronous Buck Converter |
|---|---|
|
Use Scenario: H-bridge or half-bridge driving of 24V/12A brushed motors in industrial actuators and HVAC dampers. IC Role / Device Role / Timing Role: Low-side or high-side power switch handling bidirectional PWM at 20–50 kHz. Use Value: RDS(ON) < 60 mΩ reduces I²R loss to ≤0.86 W, enabling fanless enclosure design with 175°C junction rating. |
Use Scenario: High-efficiency 12V→3.3V/5V point-of-load conversion in programmable logic controllers and sensor nodes. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to cut conduction loss and improve light-load efficiency. Use Value: Fast trr=35 ns and low Qrr=30 nC prevent cross-conduction, while Qg=10 nC supports 1 MHz operation with minimal gate drive loss. |
| Industrial Load Switching | LED Constant-Current Driver |
|
Use Scenario: Solid-state replacement for electromechanical relays controlling 48V lighting banks or solenoid valves. IC Role / Device Role / Timing Role: Single-ended switch with integrated avalanche energy rating for inductive load turn-off. Use Value: 100 mJ EAS eliminates need for external TVS/clamp, simplifying BOM and improving long-term reliability in factory automation. |
Use Scenario: Constant-current dimming of high-brightness LED strings in architectural and signage applications. IC Role / Device Role / Timing Role: PWM-controlled current sink operating in linear or saturated mode depending on dimming resolution. Use Value: Low RDS(ON) at 4.5V enables direct MCU GPIO drive, reducing component count; 175°C rating supports enclosed outdoor fixture designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-Channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AOB444 | Same die in TO-263 (D2PAK) package; RθJC=3.5°C/W vs. AOI444's 7.5°C/W; higher PD rating (60W vs. 30W). | Better thermal performance in high-power, heatsinked designs; larger footprint unsuitable for space-constrained layouts. | Select AOB444 when board area permits and >30W continuous dissipation is required; AOI444 preferred for compact IPAK-restricted footprints. |
| IRF7470PBF | 60V, 10A, RDS(ON)=65 mΩ @ 10V; Qg=12 nC; TO-251 package but not 100% UIS tested. | Lacks guaranteed avalanche ruggedness; slower tr/tf (12/8 ns) limits high-frequency use. | Acceptable for non-critical, lower-frequency switching where cost sensitivity outweighs ruggedness requirements. |
Compared with AOB444 and IRF7470PBF, the AOI444 delivers optimal balance of compact IPAK packaging, 100% UIS assurance, and 10 nC gate charge-making it ideal for space-limited, thermally demanding, and reliability-critical 24–48V industrial power switches.
Availability
AOI444 is available at Aetrix Electronics and suitable for brushed DC motor control, synchronous buck conversion, and industrial load switching requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AOI444 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-performance MOSFETs, IGBTs, and power ICs for computing, consumer, industrial, and automotive markets.
The AOI444 belongs to AOS's "Advanced Trench" discrete MOSFET product line, engineered for high-efficiency, high-reliability power switching in thermally constrained industrial and automation equipment.
FAQ
What is the maximum continuous drain current for AOI444 at 100°C case temperature?
The AOI444 supports 9 A continuous drain current at TC=100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limitations of the TO-251A package and ensures safe operation within the 175°C maximum junction temperature limit. Designers must verify PCB copper area and airflow to maintain TC ≤100°C under full load. The AOI444 datasheet provides current de-rating curves confirming this 9 A value.
Does AOI444 support logic-level gate drive from a 3.3V microcontroller?
The AOI444 is not fully enhanced at 3.3V - its gate threshold voltage (VGS(th)) ranges from 1.0 V to 3.0 V, and RDS(ON) is only specified at VGS=4.5V and 10V. At 3.3V, conduction loss increases significantly and is not characterized. For reliable logic-level operation, use AOI444 with ≥4.5V gate drive; a dedicated level-shifter or gate driver is recommended when interfacing with 3.3V MCUs.
Is AOI444 pin-compatible with AOD444?
No, AOI444 and AOD444 are not pin-compatible. AOI444 uses TO-251A (IPAK) package with G-D-S pinout, while AOD444 uses TO-252 (DPAK) package with identical G-D-S arrangement but different mechanical footprint and thermal pad layout. PCB redesign is required for substitution. Both share identical electrical specifications and die, but their packages are mechanically incompatible.
What does "100% UIS Tested" mean for AOI444?
"100% UIS Tested" means every AOI444 unit undergoes individual unclamped inductive switching stress test per JEDEC JESD22-A110, verifying minimum 100 mJ avalanche energy capability. This ensures robustness against inductive kickback in relay, solenoid, and motor drive applications without external protection. It is a production-screened reliability feature-not just a datasheet limit-and directly impacts field failure rate in real-world inductive loads.
Can AOI444 be used in a synchronous rectifier configuration?
Yes, AOI444 is suitable for synchronous rectification due to its low RDS(ON) (<60 mΩ), fast body diode (trr=35 ns, Qrr=30 nC), and low Qg (10 nC). These parameters reduce conduction and switching losses compared to Schottky diodes, especially at high currents and frequencies above 200 kHz. Its 175°C junction rating also supports high-temperature operation in dense converter layouts.
AOI444 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- TO-251-3 Stub Leads, IPAK
- Packaging:
- Tube
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 60 V
- Current - Continuous Drain (Id) @ 25°C:
- 4A (Ta), 12A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 60mOhm @ 12A, 10V
- Vgs(th) (Max) @ Id:
- 3V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 10 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 540 pF @ 30 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.1W (Ta), 20W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-251A
AOI444 FAQ
1.How can I place an order for AOI444 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOI444 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 AOI444 reliable?
The price and inventory of AOI444 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOI444 is usually 5 days.
3.What payment methods are accepted for AOI444?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOI444 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOI444?
AOI444 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOI444 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 AOI444?
For technical support, including AOI444 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOI444 requirements.
6.How does Aetrix verify that AOI444 is sourced from the original manufacturer or authorized distributors?
All AOI444 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 AOI444 meets industry standards.
7.What is the process for return or replacement of AOI444?
All AOI444 units undergo pre-shipment inspection (PSI). If there is an issue with AOI444, 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 AOI444 part is unused and in its original packaging.
Return procedure for AOI444:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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