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Alpha & Omega Semiconductor Inc. AOSS32128
- Part No.:
- AOSS32128
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 3-SMD, SOT-23-3 Variant
- Datasheet:
-
AOSS32128.pdf
- Description:
- N
- Quantity:
- Payment:
- Shipping:
Inventory:5,773
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Product details
Overview
AOSS32128 from Alpha & Omega Semiconductor is a 20V N-channel Trench Power MOSFET in SOT23-3 package, rated for 3.6A continuous drain current at VGS=10V, with RDS(ON) < 75mΩ at VGS=4.5V and < 120mΩ at VGS=1.8V, designed for low-voltage load switch applications in portable power management.
For engineers reviewing the AOSS32128 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.8V logic-level gate drive capability, HBM Class 2 ESD rating, 150°C maximum junction temperature, and verified Rg test compliance for consistent switching performance.
Technical Context
This device uses Trench Power MOSFET technology to achieve low RDS(ON) and low gate charge (Qg=2.2–6nC at VGS=4.5V), enabling efficient operation in battery-powered DC-DC and load-switch circuits where gate drive voltage may be limited to 1.8–4.5V.
Its body diode exhibits trr=3.7ns and Qrr=1.7nC under IF=3.6A/di/dt=300A/μs conditions, supporting fast recovery in synchronous rectification or reverse-polarity protection topologies without external Schottky supplementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 20V - Maximum drain-source blocking voltage; suitable for 5V/12V rail switching, not for 24V systems. |
| ID (VGS=10V) | 3.6A - Continuous current rating at full gate drive; derates to ~2.8A at TA=70°C per thermal limits. |
| RDS(ON) (VGS=4.5V) | < 75mΩ - Enables ≤270mW conduction loss at 3.6A; critical for thermally constrained SOT23-3 PCB layouts. |
| RDS(ON) (VGS=1.8V) | < 120mΩ - Supports direct interface with 1.8V GPIOs without level-shifting, reducing BOM count. |
| Qg (4.5V) | 2.2–6nC - Low gate charge minimizes driver power and enables high-frequency PWM control up to ~1MHz. |
| TJ Range | −55°C to +150°C - Industrial-grade thermal rating; allows operation in sealed enclosures or near heat sources. |
| HBM ESD | Class 2 (±2kV) - Provides robustness against handling discharge without requiring additional protection circuitry. |
Pinout & Package
SOT23-3 package: small-outline transistor with gull-wing leads, 1.3mm × 2.9mm footprint, 1.1mm height, optimized for automated pick-and-place and space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (G) | Gate | Control terminal; accepts 1.8–8V logic-level input; Rg tested to ensure consistent turn-on timing. |
| Pin 2 (D) | Drain | High-side or low-side switch node; connected to load or supply rail; carries full ID current. |
| Pin 3 (S) | Source | Reference node; tied to ground in low-side configuration or to VIN in high-side; forms body diode anode. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-level gate drive | Operates fully enhanced down to VGS=1.8V, eliminating need for gate drivers in 1.8V/2.5V/3.3V microcontroller interfaces. |
| 100% Rg tested | Guarantees gate resistance between 4–12Ω, ensuring predictable switching speed and reduced gate oscillation risk. |
| Low Qgd/Qgs ratio | Qgd=0.6nC, Qgs=0.2nC → Miller plateau well-controlled, improving noise immunity during hard switching. |
| RoHS 2.0 & Halogen-Free | Complies with EU Directive 2011/65/EU and IEC 61249-2-21, supporting green manufacturing and export compliance. |
Applications
| USB Power Delivery Switch | Smartphone Battery Protection |
|---|---|
Use Scenario: Controlling VBUS path in USB-C PD sink applications with 5V/9V/15V input rails. IC Role / Device Role / Timing Role: Low-side load switch managing power delivery handshake and overcurrent disconnect. Use Value: RDS(ON) < 75mΩ at 4.5V ensures <1.2W loss at 3.6A, meeting USB PD thermal budget in compact phone modules. | Use Scenario: Isolating main Li-ion battery from system during charging, fault, or shutdown. IC Role / Device Role / Timing Role: Reverse-polarity and overcurrent protection switch placed between battery and PMIC. Use Value: Body diode trr=3.7ns prevents shoot-through during fast polarity reversal, enhancing safety in multi-cell battery packs. |
| Wearable Sensor Node Power Gating | IoT Edge Device Wake-Up Switch |
Use Scenario: Enabling/disabling BLE radio, accelerometer, or environmental sensors to extend battery life. IC Role / Device Role / Timing Role: Ultra-low-quiescent-power load switch controlled by MCU GPIO. Use Value: 1.8V gate compatibility allows direct connection to 1.8V sensor hub outputs, eliminating level shifters and saving board area. | Use Scenario: Powering microcontroller peripherals only during active sensing cycles in battery-operated edge nodes. IC Role / Device Role / Timing Role: High-speed enable switch triggered by RTC alarm or motion interrupt. Use Value: tD(on)=5.5ns and tr=6ns support sub-microsecond wake-up latency, minimizing idle power waste. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN2016LFG-7 | RDS(ON) = 60mΩ @ 4.5V; SOT23-3; higher ID rating (4.5A); no Rg test spec. | Better conduction efficiency at 4.5V but lacks guaranteed gate resistance; less predictable drive timing. | Choose when lower RDS(ON) dominates over gate timing consistency. |
| SI2302DS-T1-GE3 | RDS(ON) = 90mΩ @ 4.5V; same SOT23-3; lower Qg (1.9nC); no 1.8V characterization data. | Lower gate charge reduces driver stress but unverified 1.8V operation limits use with ultra-low-voltage MCUs. | Prefer when gate drive power is critical and system operates ≥2.5V logic levels. |
Compared with DMN2016LFG-7 and SI2302DS-T1-GE3, the AOSS32128 uniquely combines 1.8V gate compatibility, 100% Rg testing, and HBM Class 2 ESD in a single SOT23-3 device-making it optimal for space- and voltage-constrained portable designs where timing predictability and low-VGS operation are jointly required.
Availability
AOSS32128 is available at Aetrix Electronics and suitable for USB power delivery switches, smartphone battery protection circuits, wearable sensor node power gating, and IoT edge device wake-up switches requiring stable component supply across production lifecycles.
Supply support for AOSS32128 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-efficiency MOSFETs, IGBTs, and power ICs for computing, consumer, and industrial markets.
The AOSS32128 belongs to AOS's logic-level TrenchMOS® family, engineered specifically for low-voltage load switching in battery-powered electronics where gate drive headroom is limited and thermal density is high.
FAQ
What is the maximum continuous drain current for AOSS32128 at 70°C ambient temperature?
The AOSS32128 supports 2.8A continuous drain current at TA=70°C, derived from its 3.6A rating at 25°C and thermal derating based on RθJA=125°C/W. This value assumes standard 1in² FR-4 PCB with 2oz copper; actual current capacity depends on layout-specific thermal design. The AOSS32128 datasheet specifies this limit under steady-state conditions with proper heatsinking.
Does AOSS32128 support true 1.8V gate drive across temperature and process variation?
Yes, AOSS32128 is characterized with RDS(ON) < 120mΩ at VGS=1.8V and ID=1A over −55°C to +125°C, confirming functional enhancement at 1.8V across full operating range. Its VGS(th) min/max of 0.4V/1.3V ensures reliable turn-on margin even with process spread. The AOSS32128 enables direct interfacing with 1.8V I/O without level translation.
What is the significance of 100% Rg testing for AOSS32128?
100% Rg testing verifies each AOSS32128 unit has gate resistance between 4Ω and 12Ω, ensuring consistent turn-on/turn-off timing and reduced risk of gate ringing or overshoot. This screening improves system reliability in high-frequency switching applications and simplifies gate driver design. The AOSS32128 specification sheet explicitly lists Rg as a tested parameter-not just typical.
Can AOSS32128 be used in high-side load switch configurations?
Yes, AOSS32128 can be used in high-side configuration with appropriate gate drive voltage ≥ VIN + VGS(th), though its 20V VDS rating limits use to ≤12V supply rails. For 5V systems, a simple charge-pump or bootstrap circuit suffices. The AOSS32128 body diode orientation (source-to-drain) supports reverse-current blocking in high-side placement.
Is AOSS32128 compliant with RoHS 2.0 and halogen-free requirements?
Yes, AOSS32128 meets RoHS 2.0 Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21, with bromine and chlorine content below 900ppm each. This compliance is documented in AOS's official material declarations and supports global market access. The AOSS32128 product marking and packaging reflect full environmental compliance.
AOSS32128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- 3-SMD, SOT-23-3 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 20 V
- Current - Continuous Drain (Id) @ 25°C:
- 3.6A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 1.8V, 4.5V
- Rds On (Max) @ Id, Vgs:
- 75mOhm @ 3.6A, 4.5V
- Vgs(th) (Max) @ Id:
- 1.3V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 6 nC @ 4.5 V
- Vgs (Max):
- ±8V
- Input Capacitance (Ciss) (Max) @ Vds:
- 190 pF @ 10 V
- FET Feature:
- -
- Power Dissipation (Max):
- 1.3W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AOSS32128 FAQ
1.How can I place an order for AOSS32128 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOSS32128 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 AOSS32128 reliable?
The price and inventory of AOSS32128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOSS32128 is usually 5 days.
3.What payment methods are accepted for AOSS32128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOSS32128 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOSS32128?
AOSS32128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOSS32128 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 AOSS32128?
For technical support, including AOSS32128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOSS32128 requirements.
6.How does Aetrix verify that AOSS32128 is sourced from the original manufacturer or authorized distributors?
All AOSS32128 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 AOSS32128 meets industry standards.
7.What is the process for return or replacement of AOSS32128?
All AOSS32128 units undergo pre-shipment inspection (PSI). If there is an issue with AOSS32128, 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 AOSS32128 part is unused and in its original packaging.
Return procedure for AOSS32128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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