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Alpha & Omega Semiconductor Inc. AOL1440
- Part No.:
- AOL1440
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 3-PowerSMD, Flat Leads
- Datasheet:
-
AOL1440.pdf
- Description:
- MOSFET N-CH 25V 21A/85A ULTRASO8
- Quantity:
- Payment:
- Shipping:
Inventory:8,987
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Product details
Overview
AOL1440 from Alpha & Omega Semiconductor is an N-channel enhancement-mode trench MOSFET optimized as a low-side switch in CPU core power conversion stages. It features 25 V drain-source breakdown voltage, 75 A continuous drain current at VGS = 10 V, <3.2 mΩ RDS(ON) at VGS = 20 V, and ultra-low gate charge (Qg = 40–50 nC), enabling high-efficiency synchronous buck operation.
For engineers reviewing the AOL1440 datasheet, pinout, applications, or equivalent options, key selection criteria include its 25 V rating, sub-4 mΩ on-resistance at 10 V drive, UIS-tested ruggedness, body-diode reverse recovery performance (trr = 42 ns, Qrr = 34 nC), and SO-8 package with bottom-tab drain connection for thermal management.
Technical Context
The AOL1440 employs advanced trench-gate technology to achieve low RDS(ON) while maintaining robust unclamped inductive switching (UIS) capability and fast, controlled body-diode recovery. Its gate threshold voltage (2–4 V) ensures compatibility with standard 3.3 V and 5 V logic-level drivers.
Thermal design is supported by a low junction-to-case resistance (RθJC = 1.5 °C/W) and a thermally enhanced Ultra SO-8 package with drain-connected bottom tab. The device operates across –55 °C to +175 °C junction temperature range and is rated for consumer-market applications only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 25 V - Maximum blocking voltage compatible with 12 V input bus and 1.8 V/1.2 V CPU core rails. |
| ID (continuous) | 75 A @ VGS = 10 V, TC = 25 °C - Supports high-current CPU VRM phases without parallel devices. |
| RDS(ON) | < 4.0 mΩ @ VGS = 10 V, TJ = 25 °C - Minimizes conduction loss in high-duty-cycle low-side switching. |
| Qg | 40–50 nC @ VGS = 12 V - Enables efficient high-frequency PWM control with moderate gate driver strength. |
| trr / Qrr | 42 ns / 34 nC @ IF = 20 A, dI/dt = 100 A/µs - Reduces shoot-through risk and switching loss during synchronous rectification. |
| RθJC | 1.5 °C/W - Allows direct heatsinking via PCB copper or external thermal pad for sustained 100+ W dissipation. |
| Package | Ultra SO-8 with drain-connected bottom tab - Provides mechanical robustness and superior thermal path vs. standard SO-8. |
Pinout & Package
Ultra SO-8 package with exposed drain tab on bottom surface; tab electrically connected to Drain (D). Standard top-view pin assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Control terminal; requires 10–20 V drive for full enhancement; gate resistance Rg = 0.35–1 Ω affects switching speed. |
| D | Drain | Main power output node; internally bonded to bottom thermal tab; connects to input rail or inductor node. |
| S | Source | Power return reference; tied to ground or low-side shunt; defines VGS control voltage reference. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced trench process | Enables <4 mΩ RDS(ON) at 10 V drive while maintaining 25 V BVDSS and high UIS energy rating. |
| Low Qgd/Qg ratio | Qgd = 14 nC, Qg = 40–50 nC → ~28–35% - Improves Miller immunity and reduces turn-off delay in hard-switching. |
| Body diode with soft recovery | trr = 42 ns, Qrr = 34 nC - Limits voltage overshoot and EMI during freewheeling in synchronous buck converters. |
| UIS tested | Rated for unclamped inductive switching events - Ensures reliability under transient overcurrent conditions without external snubbers. |
Applications
| CPU Core Power Delivery | GPU Voltage Regulator Modules |
|---|---|
|
Use Scenario: High-current, high-frequency synchronous buck converter supplying 1.2 V/100 A to modern x86 or ARM CPU cores. IC Role / Device Role: Low-side synchronous rectifier MOSFET, conducting during freewheeling phase with minimal conduction loss. Use Value: Sub-4 mΩ RDS(ON) at 10 V drive directly reduces I²R losses below 3 W at 75 A, improving VR efficiency >92%. |
Use Scenario: Multi-phase VRM powering discrete graphics processing units requiring dynamic load steps up to 200 A/µs. IC Role / Device Role: Low-side switch handling high RMS current and fast transient response in compact 3×3 mm² per-phase layout. Use Value: Low Qg and fast tf = 8.5 ns enable clean turn-off during aggressive load transients, minimizing shoot-through risk. |
| Point-of-Load DC-DC Converters | Server Memory Regulators |
|
Use Scenario: 12 V input to 0.85 V output converter for DDR5 memory subsystems in enterprise servers. IC Role / Device Role: Secondary-side switch in high-density, thermally constrained POL modules mounted directly on memory DIMMs. Use Value: Ultra SO-8 package with drain tab allows direct thermal coupling to DIMM PCB copper, sustaining 60 W dissipation at TC = 100 °C. |
Use Scenario: Dual-rail regulator delivering 1.1 V and 1.8 V to LPDDR5 controllers and PHYs in AI accelerator cards. IC Role / Device Role: Low-side FET in dual-output interleaved buck stage where body-diode conduction occurs during light-load discontinuous mode. Use Value: Controlled Qrr = 34 nC and soft trr = 42 ns reduce reverse recovery ringing and EMI, easing EMC compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-side MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRLHS6242 | 20 V VDS, 60 A ID, RDS(ON) = 3.8 mΩ @ 10 V, SO-8 package with drain tab. | Limited to ≤12 V input systems; lower current rating reduces margin in 75 A CPU VRM designs. | Select when system VIN ≤ 12 V and thermal budget permits higher RDS(ON). |
| SiR872DP | 30 V VDS, 80 A ID, RDS(ON) = 3.0 mΩ @ 10 V, PowerPAK SO-8 with drain tab. | Higher voltage rating adds margin but increases gate charge (Qg = 62 nC) and cost. | Prefer for 19 V input systems or where extended avalanche robustness is required beyond AOL1440's UIS rating. |
Compared with IRLHS6242 and SiR872DP, the AOL1440 delivers optimal balance of 25 V rating, 75 A current capability, and 40–50 nC gate charge for 12 V-input CPU VRMs-offering lower switching loss than the IRLHS6242 and lower drive complexity than the SiR872DP.
Availability
AOL1440 is available at Aetrix Electronics and suitable for CPU core power delivery, GPU voltage regulator modules, and point-of-load DC-DC converters requiring stable component supply and consistent thermal performance across production batches.
Supply support for AOL1440 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 AOL1440 belongs to AOS's Ultra Low RDS(ON) trench MOSFET product line, engineered specifically for high-efficiency, high-current synchronous buck converters in CPU/GPU power delivery applications.
FAQ
What is the maximum continuous drain current rating for the AOL1440?
The AOL1440 supports 75 A continuous drain current at VGS = 10 V and case temperature TC = 25 °C. At TC = 100 °C, the derated current is 66 A. This rating is bond-wire limited and validated per JEDEC standards. The AOL1440 must be mounted with adequate thermal interface to sustain these currents in production systems.
Does the AOL1440 have a drain-connected thermal pad, and how should it be implemented on PCB?
Yes, the AOL1440 uses an Ultra SO-8 package with a bottom-exposed drain tab electrically and thermally connected to the Drain terminal. For optimal thermal performance, the PCB footprint must include a large copper pour (≥200 mm²) with ≥6 thermal vias (0.3 mm diameter) connecting to inner or backside ground/power planes. The AOL1440's RθJC = 1.5 °C/W assumes this implementation.
Is the AOL1440 suitable for automotive applications?
No, the AOL1440 is explicitly qualified for the consumer market only. Alpha & Omega Semiconductor states that applications in life-support devices or automotive systems are not authorized. The AOL1440 does not meet AEC-Q101 stress test requirements or automotive temperature grade specifications (e.g., –40 °C to +150 °C).
What is the gate threshold voltage range for the AOL1440, and how does it affect drive circuit design?
The AOL1440 has a gate threshold voltage VGS(th) of 2–4 V (typical 3 V) at ID = 250 µA. This enables reliable turn-on with 3.3 V or 5 V logic-level gate drivers. However, full enhancement requires ≥10 V to achieve specified RDS(ON); using 5 V drive yields significantly higher on-resistance. Drive circuits for the AOL1440 must ensure stable 10–20 V gate bias.
How is the AOL1440's body diode performance characterized, and why does it matter in synchronous buck operation?
The AOL1440's body diode is characterized with trr = 42 ns and Qrr = 34 nC at IF = 20 A and dI/dt = 100 A/µs. In synchronous buck converters, this determines reverse recovery loss and voltage spike magnitude during high-side switch turn-on. The AOL1440's soft, low-Qrr body diode minimizes shoot-through risk and EMI generation, critical for stable 500 kHz–1 MHz operation.
AOL1440 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- 3-PowerSMD, Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 25 V
- Current - Continuous Drain (Id) @ 25°C:
- 21A (Ta), 85A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V, 20V
- Rds On (Max) @ Id, Vgs:
- 3.2mOhm @ 20A, 20V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 50 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2400 pF @ 12.5 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.3W (Ta), 75W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- UltraSO-8™
AOL1440 FAQ
1.How can I place an order for AOL1440 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOL1440 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 AOL1440 reliable?
The price and inventory of AOL1440 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOL1440 is usually 5 days.
3.What payment methods are accepted for AOL1440?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOL1440 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOL1440?
AOL1440 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOL1440 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 AOL1440?
For technical support, including AOL1440 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOL1440 requirements.
6.How does Aetrix verify that AOL1440 is sourced from the original manufacturer or authorized distributors?
All AOL1440 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 AOL1440 meets industry standards.
7.What is the process for return or replacement of AOL1440?
All AOL1440 units undergo pre-shipment inspection (PSI). If there is an issue with AOL1440, 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 AOL1440 part is unused and in its original packaging.
Return procedure for AOL1440:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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