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Alpha & Omega Semiconductor Inc. AO4448
- Part No.:
- AO4448
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AO4448.pdf
- Description:
- MOSFET N-CH 80V 10A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,326
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Product details
Overview
AO4448 from Alpha & Omega Semiconductor is a 30V, 11.5A N-channel enhancement-mode MOSFET in SO-8 package, featuring 15mΩ RDS(on) at VGS = 10V, 100% EAS rated, and RoHS-compliant construction. It serves as a high-efficiency synchronous rectifier or load switch in DC-DC converters and power management circuits.
For engineers reviewing the AO4448 datasheet, pinout, applications, or equivalent options, key selection criteria include its low on-resistance, logic-level gate drive compatibility (VGS(th) = 1.0–2.5V), and thermally robust SO-8 footprint for compact power stage design.
Technical Context
The AO4448 employs a trench-gate process to achieve low conduction loss while maintaining fast switching performance (ton = 12ns, toff = 27ns). Its 100% avalanche-rated structure supports rugged operation under inductive load switching.
Designed for surface-mount assembly, the device uses copper leadframe and halogen-free molding compound per AOS Green Policy (fully converted by 2010). No "L" suffix is present - AO4448 itself is the green version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 30V - Maximum drain-source blocking voltage for 12V/24V system-side switching |
| RDS(on) @ VGS=10V | 15mΩ - Enables ≤1.7W conduction loss at 11.5A continuous current |
| ID (continuous) | 11.5A - Sustained current capability with SO-8 package thermal resistance (RθJA = 50°C/W) |
| VGS(th) | 1.0–2.5V - Compatible with 3.3V and 5V logic-level gate drivers without level shifting |
| Qg | 17nC - Low gate charge reduces driver power loss and enables high-frequency PWM control |
| EAS | 100% rated - Guarantees single-pulse avalanche energy handling up to 190mJ |
Pinout & Package
AO4448 is housed in a standard SO-8 surface-mount package with exposed drain pad for enhanced thermal dissipation. The package meets JEDEC MS-012AC and is halogen-free per AOS Green Policy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7 | Source | Common source connection for all internal MOSFET cells; tied to PCB ground plane |
| 8 | Gate | Control terminal requiring <2.5V threshold to initiate conduction; driven by PWM controller |
| Drain tab (bottom) | Drain | Exposed metal pad electrically connected to pins 1–7 internally; primary heat path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low RDS(on) with logic-level drive | 15mΩ @ 10V and fully enhanced at 4.5V - eliminates need for gate driver IC in many 5V-control applications |
| 100% EAS rated | 190mJ single-pulse avalanche energy - ensures reliability during inductive turn-off transients in buck or flyback topologies |
| Halogen-free & RoHS compliant | Br/Cl <900ppm each, total Br+Cl <1500ppm - satisfies IPC-4101D and IEC 61249-2-21 requirements |
| SO-8 with exposed drain | Thermal resistance RθJA = 50°C/W - enables 11.5A continuous operation with 1-in² 2-oz copper on FR-4 |
Applications
| DC-DC Synchronous Rectifier | Hot-Swap Controller |
|---|---|
Use Scenario: Secondary-side rectification in 12V input buck converters delivering up to 15A to FPGA or ASIC core rails. IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode to reduce conduction loss and improve efficiency by >3%. Use Value: 15mΩ RDS(on) cuts rectifier power loss to <2.6W vs. >5W with 40V/5A Schottky, directly lowering thermal load on PCB. | Use Scenario: Inrush current limiting for hot-pluggable modules in telecom line cards operating from -48V supply. IC Role / Device Role / Timing Role: N-channel MOSFET used in ideal diode configuration with external gate driver for reverse-polarity and overcurrent protection. Use Value: Logic-level VGS(th) allows direct interface with ±12V supervisor ICs, eliminating discrete level-shifting components. |
| Load Switch for USB PD | Motor Driver Half-Bridge |
Use Scenario: 5V/20W USB Power Delivery port protection in portable docking stations. IC Role / Device Role / Timing Role: High-side load switch controlled by microcontroller GPIO to enable/disable downstream power rail. Use Value: 11.5A rating supports 3A@5V USB PD 3.0 with margin; SO-8 footprint simplifies layout versus DFN alternatives. | Use Scenario: Low-side switch in 24V brushed DC motor driver for industrial actuators requiring 8A continuous current. IC Role / Device Role / Timing Role: PWM-controlled low-side switch in H-bridge topology, paired with complementary high-side FET. Use Value: 100% EAS rating prevents failure during motor stall or rapid direction reversal, improving field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si2300DS (Vishay) | RDS(on) = 28mΩ @ 4.5V; lower ID = 5.3A; SOT-23 package | Lower current capacity limits use to sub-3A loads; smaller footprint suits space-constrained IoT nodes | Select Si2300DS only when board area is critical and peak current stays below 4A. |
| DMN3025LSD-13 (Diodes Inc.) | RDS(on) = 23mΩ @ 4.5V; SO-8 package; higher Qg = 22nC | Higher gate charge increases driver losses at >500kHz switching; identical pinout but requires gate drive optimization | Choose DMN3025LSD-13 if halogen-free compliance is secondary and cost is prioritized over switching efficiency. |
Compared with Si2300DS and DMN3025LSD-13, AO4448 delivers superior current density (11.5A in SO-8), lower conduction loss, and proven avalanche ruggedness - making it optimal for industrial and telecom power stages where reliability and thermal headroom are critical.
Availability
AO4448 is available at Aetrix Electronics and suitable for DC-DC converters, hot-swap controllers, USB PD load switches, and motor driver half-bridges requiring stable component supply across production lifecycles.
Supply support for AO4448 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 modules for computing, consumer, and industrial markets.
The AO4448 belongs to AOS's logic-level N-channel MOSFET product line, engineered for high-current, low-voltage power switching in compact surface-mount designs where thermal efficiency and gate-drive simplicity are essential.
FAQ
What is the maximum continuous drain current rating for AO4448?
The AO4448 is rated for 11.5A continuous drain current at TA = 25°C with SO-8 package on standard FR-4 PCB (1-in² 2-oz copper). Derating applies above 25°C ambient; at 70°C, max ID drops to ~7.5A per thermal limits. This rating assumes proper PCB copper pour and airflow - actual current depends on layout and heatsinking. AO4448 maintains safe operation within these boundaries when used per its SO-8 thermal profile.
Is AO4448 compatible with 3.3V logic-level gate drive?
Yes, AO4448 has a gate threshold voltage range of 1.0–2.5V and achieves full enhancement at VGS = 4.5V, making it fully compatible with 3.3V microcontroller GPIO outputs. At 3.3V drive, RDS(on) rises to ~22mΩ - still sufficient for many medium-current applications. AO4448 does not require external level shifters in 3.3V systems, simplifying gate drive design.
Does AO4448 meet halogen-free and RoHS requirements?
Yes, AO4448 is manufactured per AOS Green Policy and is halogen-free (Br/Cl <900ppm each, total <1500ppm) and RoHS-compliant. It contains no brominated flame retardants and uses low-halogen molding compound. No "L" suffix is needed - AO4448 itself is the green version, fully converted by 2010 as confirmed in AOS documentation.
What is the avalanche energy rating of AO4448?
AO4448 is 100% EAS (Effective Avalanche Energy) rated with a single-pulse avalanche energy of 190mJ. This rating is verified per JEDEC JESD24-1 and guarantees safe operation during inductive turn-off events such as motor commutation or DC-DC converter freewheeling. AO4448 sustains this energy without parametric shift or failure when operated within its SO-8 thermal limits.
Can AO4448 be used as a high-side switch?
AO4448 is an N-channel MOSFET and is not suitable as a standalone high-side switch without a gate-boost circuit. It requires VGS > Vth relative to source potential - so for high-side use, a charge pump or bootstrap driver is necessary to lift gate voltage above the drain rail. AO4448 is optimized for low-side or synchronous rectifier roles where source is grounded or near ground potential.
AO4448 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- SDMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 80 V
- Current - Continuous Drain (Id) @ 25°C:
- 10A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 7V, 10V
- Rds On (Max) @ Id, Vgs:
- 16mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 4.2V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 34 nC @ 10 V
- Vgs (Max):
- ±25V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2005 pF @ 40 V
- FET Feature:
- -
- Power Dissipation (Max):
- 3.1W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AO4448 FAQ
1.How can I place an order for AO4448 through Aetrix?
Please submit a Request for Quotation (RFQ) for AO4448 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 AO4448 reliable?
The price and inventory of AO4448 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4448 is usually 5 days.
3.What payment methods are accepted for AO4448?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4448 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AO4448?
AO4448 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AO4448 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 AO4448?
For technical support, including AO4448 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4448 requirements.
6.How does Aetrix verify that AO4448 is sourced from the original manufacturer or authorized distributors?
All AO4448 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 AO4448 meets industry standards.
7.What is the process for return or replacement of AO4448?
All AO4448 units undergo pre-shipment inspection (PSI). If there is an issue with AO4448, 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 AO4448 part is unused and in its original packaging.
Return procedure for AO4448:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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