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Alpha & Omega Semiconductor Inc. AO4430
- Part No.:
- AO4430
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AO4430.pdf
- Description:
- MOSFET N-CH 30V 18A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,873
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Product details
Overview
AO4430 from Alpha & Omega Semiconductor is a 30V, 10A N-channel enhancement-mode MOSFET in SO-8 package, featuring 22mΩ RDS(on) at VGS = 10V, 100% EAS rated, and RoHS-compliant green packaging. It serves as a high-efficiency synchronous rectifier or load switch in DC-DC converters and power management circuits.
For engineers reviewing the AO4430 datasheet, pinout, applications, or equivalent options, key selection factors include its low on-resistance, logic-level gate drive compatibility (VGS(th) = 1.7V max), and thermally enhanced SO-8 footprint for compact power stage design.
Technical Context
The AO4430 uses trench-gate process technology to achieve low RDS(on) and fast switching performance. Its gate threshold voltage range (1.0–1.7V) enables direct interfacing with 3.3V and 5V logic controllers without level-shifting circuitry.
Designed for unidirectional current flow in low-side switching configurations, the device supports continuous drain current up to 10A at TC = 25°C and features 100% avalanche energy rating (EAS = 45mJ), ensuring robustness against inductive load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 30V - Maximum drain-source blocking voltage for 12V input rail applications |
| RDS(on) @ VGS=10V | 22mΩ - Enables <1W conduction loss at 6.7A DC current in typical buck converter output stage |
| ID (continuous) | 10A - Rated for sustained operation at TC = 25°C with adequate heatsinking |
| VGS(th) | 1.0–1.7V - Ensures full enhancement with standard 3.3V microcontroller GPIOs |
| Qg | 19nC - Supports efficient 500kHz–1MHz PWM switching with moderate gate driver strength |
| EAS | 45mJ - Guarantees single-pulse avalanche survivability in flyback or synchronous rectifier fault conditions |
Pinout & Package
AO4430 is housed in a thermally optimized SO-8 surface-mount package with exposed drain pad for enhanced heat dissipation. The package meets AOS Green Policy requirements (halogen-free, RoHS-compliant) and carries no "L" suffix since SO-8 conversion to green was completed prior to 2010.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Source | Common return path for load current; internally bonded to all source die connections |
| 5, 6, 7, 8 | Drain | Main current-carrying terminal tied to exposed copper pad; requires PCB thermal relief |
| G | Gate | Control electrode; accepts logic-level voltage to modulate channel conductivity |
Key Features
| Feature | Design Value |
|---|---|
| Low RDS(on) at 10V | 22mΩ enables high-efficiency power delivery in space-constrained 12V systems |
| Logic-level gate drive | VGS(th) ≤ 1.7V allows direct control by 3.3V/5V MCUs without gate drivers |
| 100% EAS rated | 45mJ avalanche energy rating eliminates need for external snubbers in inductive switching |
| Green (halogen-free) package | SO-8 construction complies with AOS Green Policy and IEC 61249-2-21 standards |
Applications
| DC-DC Synchronous Rectifier | Hot-Swap Controller |
|---|---|
Use Scenario: Secondary-side rectification in 12V-to-3.3V/5V buck converters for server VRMs and telecom power supplies. IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode to reduce conduction loss and improve efficiency. Use Value: 22mΩ RDS(on) cuts rectifier losses by >40% vs. 40V Schottky, enabling higher power density at 92%+ efficiency. | Use Scenario: Inrush current limiting during board insertion into live backplane slots. IC Role / Device Role / Timing Role: Controlled low-side switch enabling soft-start via gate slew-rate control. Use Value: Logic-level gate threshold ensures precise turn-on timing with standard PMBus/I²C hot-swap controllers. |
| Load Switch for USB PD | Motor Driver Half-Bridge |
Use Scenario: 5V/9V/15V load switching in USB Power Delivery sink applications with overcurrent protection. IC Role / Device Role / Timing Role: High-side or low-side load switch controlled by USB PD policy engine. Use Value: 10A rating and 1.7V VGS(th) support direct interface with 3.3V PD controller GPIOs for fast enable/disable response. | Use Scenario: Low-side switch in 24V brushed DC motor H-bridge drivers for industrial actuators. IC Role / Device Role / Timing Role: Ground-referenced power switch handling bidirectional current during PWM commutation. Use Value: 45mJ EAS withstands flyback energy from motor inductance during rapid PWM turn-off events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRF7470PBF | RDS(on) = 24mΩ @ 10V; Qg = 22nC; same SO-8 package | Slightly higher gate charge increases switching loss above 300kHz | Preferred where legacy IR design reuse is required and minor efficiency trade-off is acceptable |
| Si2300DS-T1-E3 | RDS(on) = 28mΩ @ 4.5V; 30V rating; SOT-23 package, 3.3A ID | Lower current rating and smaller package limit use to sub-3A loads | Selected for ultra-compact, low-power applications where board area is critical and 10A capability is unnecessary |
Compared with IRF7470PBF and Si2300DS-T1-E3, the AO4430 delivers superior conduction efficiency at 10A loads, maintains logic-level drive compatibility, and offers the highest avalanche ruggedness-making it optimal for demanding 12V power stages requiring reliability and thermal headroom.
Availability
AO4430 is available at Aetrix Electronics and suitable for DC-DC converters, hot-swap modules, and USB PD load switches requiring stable component supply and long-term manufacturing continuity.
Supply support for AO4430 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, and industrial markets.
The AO4430 belongs to AOS's logic-level N-channel MOSFET product line, engineered for high-efficiency, low-voltage power conversion in space- and thermally constrained applications.
FAQ
What is the maximum continuous drain current rating for AO4430?
The AO4430 is rated for 10A continuous drain current at case temperature TC = 25°C with sufficient PCB copper area for heat dissipation. Derating applies above 25°C; at TC = 70°C, the usable current drops to approximately 6.5A per the SO-8 thermal resistance curve. This rating makes AO4430 suitable for medium-power 12V-to-5V/3.3V buck converters where peak load currents remain below 10A.
Does AO4430 require a gate driver when used with a 3.3V microcontroller?
No, AO4430 does not require an external gate driver when driven by a 3.3V microcontroller. Its gate threshold voltage is specified from 1.0V to 1.7V, and it achieves full enhancement at VGS = 4.5V (RDS(on) = 28mΩ). This logic-level compatibility allows direct connection to 3.3V GPIOs, simplifying layout and reducing BOM count in AO4430-based power stages.
Is AO4430 halogen-free and RoHS compliant?
Yes, AO4430 is fully RoHS compliant and manufactured in a halogen-free SO-8 package per AOS Green Policy. As confirmed in AOS documentation, all SO-8 devices-including AO4430-were converted to green (halogen-free) status prior to 2010, and no "L" suffix is used for this package type. The device meets IEC 61249-2-21 and JEDEC JS-709C requirements.
What is the avalanche energy rating of AO4430 and how is it tested?
The AO4430 has a single-pulse avalanche energy rating (EAS) of 45mJ, verified per JEDEC JESD24-1 test methodology using inductive load conditions. This rating ensures reliable operation during transient overvoltage events such as inductive kickback in motor drives or synchronous rectifier turn-off. The AO4430 datasheet specifies EAS testing at TJ = 25°C with L = 0.1mH, IAR = 10A, and VDD = 25V.
Can AO4430 be used in parallel with another AO4430 for higher current handling?
Yes, AO4430 can be paralleled to increase current capacity, but careful attention must be paid to gate drive matching, PCB layout symmetry, and thermal coupling. Due to its positive temperature coefficient of RDS(on), current sharing improves with temperature rise-however, mismatched gate resistances or unequal trace inductance may cause imbalance. For 20A designs, two AO4430 devices with matched gate drivers and shared thermal plane are viable, though discrete current sensing remains recommended.
AO4430 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 30 V
- Current - Continuous Drain (Id) @ 25°C:
- 18A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 5.5mOhm @ 18A, 10V
- Vgs(th) (Max) @ Id:
- 2.5V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 124 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 7270 pF @ 15 V
- FET Feature:
- -
- Power Dissipation (Max):
- 3W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AO4430 FAQ
1.How can I place an order for AO4430 through Aetrix?
Please submit a Request for Quotation (RFQ) for AO4430 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 AO4430 reliable?
The price and inventory of AO4430 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4430 is usually 5 days.
3.What payment methods are accepted for AO4430?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4430 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AO4430?
AO4430 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AO4430 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 AO4430?
For technical support, including AO4430 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4430 requirements.
6.How does Aetrix verify that AO4430 is sourced from the original manufacturer or authorized distributors?
All AO4430 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 AO4430 meets industry standards.
7.What is the process for return or replacement of AO4430?
All AO4430 units undergo pre-shipment inspection (PSI). If there is an issue with AO4430, 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 AO4430 part is unused and in its original packaging.
Return procedure for AO4430:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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