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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Alpha & Omega Semiconductor Inc. AO4268

Name: AO4268
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4268
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4268

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AO4268.pdf

Description:: MOSFET N-CHANNEL 60V 19A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4268 from Alpha & Omega Semiconductor is a 60V, 19A N-channel Trench Power MOSFET in SO-8 package, featuring <4.8mΩ R_DS(ON) at V_GS=10V and <6.5mΩ at V_GS=4.5V, with 44–65nC total gate charge and 100% UIS-tested ruggedness for high-efficiency synchronous rectification in AC-DC quick chargers.

For engineers reviewing the AO4268 datasheet, pinout, applications, or equivalent options, key selection criteria include its low R_DS(ON) at 4.5V drive, body-diode reverse recovery time of 22ns, avalanche energy rating of 135mJ (L=0.3mH), thermal resistance R_θJA = 75°C/W, and SOIC-8 footprint compatibility with standard PCB layouts.

Technical Context

This MOSFET employs AlphaSGT™ trench technology to achieve optimized conduction and switching trade-offs. Its gate threshold voltage (1.3–2.3V) enables reliable turn-on with 4.5V logic-level drive, while low Q_gd/Q_g ratio (8.5/44–65nC) supports fast, controllable switching transitions.

The device is characterized for unclamped inductive switching (UIS) with 100% testing, and its body diode exhibits 80nC reverse recovery charge and 22ns t_rr under IF=19A, di/dt=500A/µs - critical for minimizing losses in high-frequency synchronous rectifier topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60V - maximum drain-source blocking voltage; defines safe operating range in 48V-input or 24V-output quick charger secondary-side circuits.
I_D (V_GS=10V)	19A - continuous drain current at 25°C ambient; supports ≥30W output power in compact USB PD adapters with adequate heatsinking.
R_DS(ON) (V_GS=4.5V)	<6.5mΩ - ensures low conduction loss when driven by standard 5V PWM controllers or integrated gate drivers in QR flyback designs.
Q_g(10V)	44–65nC - total gate charge determines driver strength requirement; enables efficient 100–300kHz switching with ≤3Ω gate resistor.
t_rr	22ns - body diode reverse recovery time; reduces shoot-through risk and EMI in synchronous rectifier operation with fast voltage transitions.
E_AS	135mJ - single-pulse avalanche energy; provides margin against transient overvoltage during no-load or light-load conditions in unregulated outputs.
R_θJA	75°C/W - junction-to-ambient thermal resistance on 1in² FR-4 board; sets maximum power dissipation limit (~2.4W at ΔT=180°C) for thermally constrained layouts.

Pinout & Package

AO4268 is housed in a standard SOIC-8 (SO-8) surface-mount package with exposed drain pads on pins 1–4 and 6–8, source terminals on pins 5 and 7, and gate on pin 3 - enabling high-current routing and thermal relief via PCB copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1,2,3,4,6,7,8	Drain (D)	Parallel-connected drain terminals form low-inductance, high-current path; pins 1–4 and 6–8 are internally tied to maximize current handling and thermal conduction to PCB.
5,7	Source (S)	Source connection shared across two pins (5 and 7) to reduce loop inductance and improve gate-drive stability in high-dI/dt applications.
3	Gate (G)	Single gate input with 0.5–2Ω gate resistance; requires external series resistor (typically 1–5Ω) to damp ringing and control dV/dt during switching.

Key Features

Feature	Design Value
AlphaSGT™ trench process	Enables sub-5mΩ R_DS(ON) at 60V while maintaining robust avalanche capability and low gate charge.
100% UIS tested	Guarantees minimum 135mJ avalanche energy per device - eliminates screening failures in high-voltage transient environments.
Low Q_gd/Q_g ratio	~0.13–0.19 ratio (8.5/44–65nC) improves Miller immunity and enables stable hard-switching up to 300kHz without oscillation.
Body diode t_rr = 22ns	Reduces reverse recovery loss and associated voltage spikes during synchronous rectifier commutation, lowering EMI filter burden.
SOIC-8 with exposed drain	Standard footprint allows drop-in replacement in existing designs; exposed drain pins enable direct thermal coupling to inner-layer copper planes.

Applications

AC-DC Quick Charger Secondary Side	USB PD Adapter Synchronous Rectifier
Use Scenario: High-efficiency 20–65W USB PD adapter using QR flyback topology with 5–20V output. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode on secondary side; switches in phase with primary controller's demagnetization signal. Use Value: Achieves >94% efficiency at full load by eliminating 0.4–0.7V diode forward drop, reducing heat generation and enabling smaller heatsinks.	Use Scenario: Compact wall-mounted USB-C charger with dual-port output and variable voltage negotiation (5/9/15/20V). IC Role / Device Role / Timing Role: Low-R_DS(ON) N-channel MOSFET used as active rectifier controlled by dedicated SR controller (e.g., MP6908). Use Value: Enables 4.5V-compatible gate drive and 22ns t_rr to minimize cross-conduction loss during voltage reversal, improving light-load efficiency.
High-Density GaN-Based Adapter Output Stage	Industrial DC-DC Converter Secondary Switch
Use Scenario: 100W+ GaN-based adapter where primary-side GaN FET operates at >500kHz and secondary-side rectification must match speed. IC Role / Device Role / Timing Role: Fast-recovery synchronous rectifier co-located with GaN controller; handles 19A peak currents with minimal voltage overshoot. Use Value: 135mJ E_AS withstands voltage spikes from fast primary-side switching, while 6.5mΩ R_DS(ON) at 4.5V ensures low loss even with limited gate drive headroom.	Use Scenario: 48V-to-12V isolated DC-DC converter for industrial PLC I/O modules requiring long-term reliability and surge immunity. IC Role / Device Role / Timing Role: Secondary-side power switch in forward or active-clamp forward topology; conducts continuous 15A output current. Use Value: 100% UIS testing and -55°C to +150°C operating range ensure robustness against line surges and ambient temperature extremes in factory-floor environments.

AC-DC Quick Charger Secondary Side

USB PD Adapter Synchronous Rectifier

Use Scenario: High-efficiency 20–65W USB PD adapter using QR flyback topology with 5–20V output.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode on secondary side; switches in phase with primary controller's demagnetization signal.

Use Value: Achieves >94% efficiency at full load by eliminating 0.4–0.7V diode forward drop, reducing heat generation and enabling smaller heatsinks.

Use Scenario: Compact wall-mounted USB-C charger with dual-port output and variable voltage negotiation (5/9/15/20V).

IC Role / Device Role / Timing Role: Low-R_DS(ON) N-channel MOSFET used as active rectifier controlled by dedicated SR controller (e.g., MP6908).

Use Value: Enables 4.5V-compatible gate drive and 22ns t_rr to minimize cross-conduction loss during voltage reversal, improving light-load efficiency.

High-Density GaN-Based Adapter Output Stage

Industrial DC-DC Converter Secondary Switch

Use Scenario: 100W+ GaN-based adapter where primary-side GaN FET operates at >500kHz and secondary-side rectification must match speed.

IC Role / Device Role / Timing Role: Fast-recovery synchronous rectifier co-located with GaN controller; handles 19A peak currents with minimal voltage overshoot.

Use Value: 135mJ E_AS withstands voltage spikes from fast primary-side switching, while 6.5mΩ R_DS(ON) at 4.5V ensures low loss even with limited gate drive headroom.

Use Scenario: 48V-to-12V isolated DC-DC converter for industrial PLC I/O modules requiring long-term reliability and surge immunity.

IC Role / Device Role / Timing Role: Secondary-side power switch in forward or active-clamp forward topology; conducts continuous 15A output current.

Use Value: 100% UIS testing and -55°C to +150°C operating range ensure robustness against line surges and ambient temperature extremes in factory-floor environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SiR872DP	R_DS(ON) = 4.3mΩ @ 10V (lower), Q_g = 52nC (higher), SO-8 package, same V_DS rating	Better conduction loss but higher gate drive demand; less suitable for 4.5V-only drive systems	Prefer SiR872DP only if gate drive voltage ≥10V and layout allows increased driver power dissipation.
IRF7470PBF	R_DS(ON) = 5.8mΩ @ 10V, Q_g = 32nC (lower), TO-252 package (not SO-8), 60V rating	Lower gate charge eases drive but TO-252 footprint requires PCB redesign; lacks 100% UIS test documentation	Select IRF7470PBF only when thermal performance via DPAK mounting outweighs SO-8 compatibility needs.

Compared with SiR872DP and IRF7470PBF, AO4268 offers optimal balance of 4.5V drivability, 6.5mΩ R_DS(ON), and documented UIS ruggedness in SO-8 - making it uniquely suited for space-constrained, logic-level-driven synchronous rectifiers where reliability under transient stress is mandatory.

Availability

AO4268 is available at Aetrix Electronics and suitable for AC-DC quick chargers, USB PD adapters, and industrial DC-DC converters requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AO4268 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 AO4268 belongs to AOS's AlphaSGT™ trench MOSFET product line, engineered specifically for high-efficiency, high-frequency power conversion in compact AC-DC and DC-DC applications where low R_DS(ON), fast switching, and ruggedness are critical.

FAQ

What is the maximum continuous drain current rating for AO4268 at 70°C ambient temperature?

The AO4268 supports 14.5A continuous drain current at TA=70°C with proper PCB thermal design. This derating reflects its R_θJA = 75°C/W and TJ(MAX)=150°C limit. At 25°C ambient, the rating rises to 19A. The actual usable current depends on copper area, layer count, and airflow - verified via SOA curves in the AO4268 datasheet Figure 9.

Does AO4268 support 4.5V gate drive in synchronous rectifier applications?

Yes, AO4268 is fully specified for 4.5V gate drive: its R_DS(ON) is guaranteed <6.5mΩ at V_GS=4.5V, and V_GS(th) ranges from 1.3V to 2.3V - ensuring strong enhancement-mode turn-on with standard 5V logic or dedicated SR controllers like MP6908. This makes AO4268 suitable for USB PD adapters without level-shifting circuitry.

What is the body diode reverse recovery performance of AO4268?

The AO4268 body diode has t_rr = 22ns and Q_rr = 80nC under IF=19A and di/dt=500A/µs. These values are measured and guaranteed per datasheet page 2, enabling predictable timing margins in synchronous rectifier control loops and reducing voltage overshoot during commutation - a key advantage over standard planar MOSFETs.

Is AO4268 qualified for automotive applications?

No, AO4268 is not AEC-Q101 qualified and is intended for industrial and consumer power supplies only. Its datasheet explicitly excludes life-support or automotive-critical use. For automotive-grade equivalents, consult AOS's AUIRF series or contact Aetrix Electronics for AEC-Q101-compliant alternatives compatible with AO4268's SO-8 footprint.

How is avalanche ruggedness validated for AO4268?

AO4268 undergoes 100% unclamped inductive switching (UIS) testing per JEDEC JESD22-A115, with each unit verified to sustain ≥135mJ avalanche energy (L=0.3mH). This is documented in the "Product Summary" and "Absolute Maximum Ratings" sections of the AO4268 datasheet Rev. 1.0, confirming robustness against inductive transients in real-world power converter operation.

AO4268 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: AlphaSGT™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 19A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 4.8mOhm @ 19A, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 65 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2500 pF @ 30 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

AO4268 FAQ

1.How can I place an order for AO4268 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4268 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 AO4268 reliable?

The price and inventory of AO4268 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4268 is usually 5 days.

3.What payment methods are accepted for AO4268?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4268 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4268?

AO4268 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4268 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 AO4268?

For technical support, including AO4268 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4268 requirements.

6.How does Aetrix verify that AO4268 is sourced from the original manufacturer or authorized distributors?

All AO4268 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 AO4268 meets industry standards.

7.What is the process for return or replacement of AO4268?

All AO4268 units undergo pre-shipment inspection (PSI). If there is an issue with AO4268, 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 AO4268 part is unused and in its original packaging.

Return procedure for AO4268:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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