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        Triconex AO3481
        Triconex AO3481
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        Triconex AO3481
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        AO3481

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        1001 reviews ｜ Need a Specific Revision?
        The AO3481 is a -30V P‑Channel MOSFET in SOT‑23 package with 4.0A continuous drain current, low RDS(ON) of 50mΩ at -10V VGS, and RoHS compliance.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
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        Technical specifications for AO3481

        • Manufacturer:
          Invensys
        • Part Number:
          AO3481
        • Product Family:
          Triconex
        • Product Type:
          P‑Channel MOSFET
        • VDS (Drain‑Source Voltage):
          -30 V
        • ID (Continuous Drain Current) @ TA=25°C:
          -4.0 A
        • RDS(ON) @ VGS = -10V:
          <50 mΩ
        • VGS(th) (Gate Threshold Voltage):
          -0.5 to -1.3 V
        • gFS (Forward Transconductance):
          17 S
        • CISS (Input Capacitance):
          645 pF
        • td(on) (Turn‑On Delay Time):
          6.5 ns
        • trr (Body Diode Reverse Recovery Time):
          11 ns
        • RθJA (Junction‑to‑Ambient, steady‑state):
          125 °C/W
        • TJ, TSTG (Junction/Storage Temp):
          -55 to 150 °C
        • Weight:
          1.45 kg
        • Estimated shipping dimensions:
          4.3x18.8x21.8cm
        • Tariff Code:
          8538900000
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Application Firmware & Updates Configuration

        Features:

        • Minimizes conduction loss; 60mΩ at -4.5V; 85mΩ at -2.5V; suitable for load switching and power management.
        • Turn‑on delay 6.5ns, turn‑off delay 41ns; ideal for high‑frequency PWM applications such as LED dimming and small motor drives.
        • Suitable for space‑constrained designs; RoHS and halogen‑free compliant.
        The AO3481 achieves a maximum RDS(ON) of 50mΩ at VGS = -10V and ID = -4.0A. This low on‑resistance minimizes voltage drop across the MOSFET when it is conducting, which reduces power dissipation (I²R losses). For a load current of 4A, the voltage drop is only 0.2V and power loss is 0.8W. At lower gate drive voltages, RDS(ON) is still acceptable: 60mΩ at -4.5V and 85mΩ at -2.5V.

        The AO3481 has a total gate charge (Qg) of only 14nC at VGS = -10V and VDS = -15V. At 4.5V gate drive, Qg drops to 7nC. This low gate charge reduces the power consumed by the gate driver, especially at high switching frequencies. The gate driver only needs to supply a small amount of charge to turn the MOSFET on and off quickly. The switching times are also fast: turn‑on delay (td(on)) is 6.5ns, rise time (tr) is 3.5ns, turn‑off delay (td(off)) is 41ns, and fall time (tf) is 9ns (typical). These fast switching speeds allow the AO3481 to be used in PWM (pulse‑width modulation) applications up to several hundred kilohertz.

        The AO3481 is housed in a SOT‑23 (Surface‑Mount) package, which measures approximately 3.0mm in length, 1.4mm in width, and 1.1mm in height (typical). This compact footprint is ideal for space‑constrained PCBs, such as those found in portable electronics, wearables, and embedded modules. Despite its small size, the AO3481 is rated for a continuous drain current of -4.0A at 25°C ambient (derated to -3.2A at 70°C). To achieve this current rating, the device must be mounted on a PCB with adequate copper area for heat spreading.

        The AO3481 Triconex P‑Channel MOSFET may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

        Triconex AO3481 P‑Channel MOSFET Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
        Triconex AO3481 P-Channel MOSFET Specs

        General

        • Manufacturer Triconex
        • Model AO3481
        • Condition New Original ready stock
        • Product Family 9753-110,9853-610,9760-210,9662-110
        Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
        • Safety Control Valve Actuation: Converts digital commands from the main processors into 8 independent 4–20 mA analog signals to precisely modulate control valves, steam governors, and chemical injection regulators.
        • Turbine & Compressor Anti-Surge Systems: Deployed in high-pressure steam/gas turbines and compressor control networks to provide sub-millisecond dynamic analog outputs for surge prevention.
        • Emergency Depressurization & Isolation: Executes safety-related proportional throttling for emergency blowdown valves, safety relief valves, and motor-operated valves (MOVs) during thermal or pressure overruns.
        • Firmware Compatibility Lock: The onboard firmware is locked and certified by international safety bodies (such as TÜV). It cannot be casually patched. The firmware version must strictly match the Tricon System Compatibility List (TS113) defined for your core Tricon controller.
        • Update Execution Path: Daily operational maintenance requires no firmware adjustments since the module contains embedded self-calibration logic. If a critical safety patch or a major system upgrade (e.g., migrating from Tricon v9 to v10) is required, the update must be performed during a planned plant turnaround by a certified Schneider Electric engineer using proprietary flash utilities.
        • Load Fault Monitoring: Diagnostic thresholds are configured to trigger system alarms if a field circuit loop experiences an open circuit (broken wire) or a short-circuit overload condition.
        • Hardware Voting Mechanism: In the programming code, engineers only interact with a single logical variable tag. Internally, the 3481 module replicates this variable across three isolated, independent channels.
        • Programming Standards: Logic is authored using IEC 61131-3 standard languages (such as Function Block Diagrams - FBD, or Structured Text - ST).
        • Automatic Zero-Drift Calibration: Each channel features a dedicated internal voltage reference source that conducts automatic background self-calibrations, ensuring the 4–20 mA loop does not suffer from long-term thermal or signal drift.
        Description
        The AO3481 is a P‑Channel enhancement‑mode MOSFET from Alpha & Omega Semiconductor. It is packaged in a compact SOT‑23 outline, making it suitable for space‑constrained applications. The device features a drain‑source voltage (VDS) of -30V and a continuous drain current (ID) of -4.0A at 25°C. 

        When using the AO3481, engineers benefit from low gate charge (Qg = 14nC typical) and fast switching speeds. The turn‑on delay time is 6.5ns, and turn‑off delay time is 41ns typical. The device can operate at gate voltages as low as 2.5V, with RDS(ON) of 85mΩ at VGS = -2.5V. 


        For load switching and power management designs, the AO3481 provides an excellent combination of low on‑resistance and small footprint. Its SOT‑23 package occupies very little board space. The AO3481 is suitable for battery‑powered applications due to its low gate drive voltage requirement (2.5V). 
        Alternative Names
        AO348I A03481 9674-810 9761-210 9853-610 3503E 9760-210 9662-110 9753-110
        Technical notes
        The AO3481 is a -30V P‑Channel MOSFET in SOT‑23 package with 4.0A continuous drain current and low RDS(ON) of 50mΩ at -10V. It features low gate charge (14nC) and fast switching (ton=6.5ns). The device operates with gate voltages as low as 2.5V.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Can AO3481 be used as a load switch?
        Yes, the AO3481 is ideal for load switch applications. Its low RDS(ON) (50mΩ at -10V) minimizes voltage drop and power loss. The low gate threshold voltage (as low as -2.5V) allows direct control from 3V logic, making it perfect for battery‑powered systems.
        Does AO3481 work with low gate drive voltages?
        Yes. The AO3481 operates with gate voltages as low as -2.5V. At VGS = -2.5V, RDS(ON) is 85mΩ (max), still acceptable for many applications. At VGS = -4.5V, RDS(ON) drops to 60mΩ. Ensure your gate drive voltage is within the ±12V maximum.
        How fast is the AO3481?
        The AO3481 has fast switching characteristics: turn‑on delay 6.5ns, rise time 3.5ns, turn‑off delay 41ns, fall time 9ns (typical). Total gate charge is only 14nC at -10V. This makes it suitable for high‑frequency PWM applications such as LED dimming and small motor control.
        What is the derating for AO3481 at elevated temperatures?
        At TA=70°C, the continuous drain current derates to -3.2A (from -4.0A at 25°C). Power dissipation derates from 1.4W at 25°C using a typical 125°C/W RθJA. For higher temperatures, use larger copper areas for PCB heat sinking to improve thermal performance.

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