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

Alpha & Omega Semiconductor Inc. AOB409L

Name: AOB409L
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOB409L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOB409L

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: AOB409L.pdf

Description:: MOSFET P-CH 60V 5A/31.5A TO263

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Product details

Overview

AOB409L from Alpha & Omega Semiconductor is a 60V P-Channel enhancement-mode trench MOSFET with R_DS(ON) < 38 mΩ at V_GS = −10 V, −31.5 A continuous drain current, and TO-263 (D2PAK) package. It serves as a high-efficiency synchronous rectifier or high-side switch in DC-DC boost converters for LED backlighting and industrial power supplies.

For engineers reviewing the AOB409L datasheet, pinout, applications, or equivalent options, key selection criteria include its low R_DS(ON) at −4.5 V (≤ 50 mΩ), 100% UIS-tested ruggedness, gate charge of 43 nC (at 10 V), and thermal resistance R_θJC = 1.8 °C/W - critical for thermally constrained high-current switching designs.

Technical Context

The AOB409L employs advanced trench-gate process technology to achieve low on-resistance while maintaining robust avalanche capability (E_AS rated, 100% tested). Its P-channel configuration enables high-side switching without level-shifting circuitry in buck-derived topologies.

It features a fast body diode with t_rr = 25.7 ns and Q_rr = 167 nC, supporting high-frequency synchronous rectification. The device is characterized across −55°C to +175°C junction temperature range and supports stable operation under repetitive unclamped inductive switching stress.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	−60 V - maximum blocking voltage for use in 48 V input systems and higher-voltage boost stages
I_D (V_GS = −10 V)	−31.5 A - continuous conduction capability at T_C = 25°C, enabling high-power density designs
R_DS(ON) (V_GS = −10 V)	< 38 mΩ - reduces conduction loss in high-current paths; typical value ~30 mΩ at 25°C
R_DS(ON) (V_GS = −4.5 V)	< 50 mΩ - ensures usable on-state performance with logic-level gate drive
Q_g (10 V)	43 nC - determines gate drive power and switching speed; compatible with standard MOSFET drivers
R_θJC	1.8 °C/W - enables >41 W steady-state power dissipation with minimal case-to-heatsink ΔT
E_AS	Rated - 100% unclamped inductive switching tested per JEDEC JESD24-11, ensuring reliability in hard-switched circuits

Pinout & Package

AOB409L is housed in a surface-mount TO-263 (D2PAK) package with exposed drain pad for enhanced thermal performance. The package has three terminals: Gate (G), Drain (D), and Source (S), with Drain electrically connected to the tab.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Controls channel conduction; requires −10 V for full enhancement; gate threshold V_GS(th) = −1.2 to −2.4 V
D	Drain	Main current entry point; internally tied to exposed metal tab for low-inductance, high-current path and thermal conduction
S	Source	Reference node for gate drive and current return; common connection point for load and driver ground in high-side configurations

Key Features

Feature	Design Value
Advanced trench MOSFET technology	Delivers <38 mΩ R_DS(ON) at −10 V while maintaining high V_DS rating and avalanche robustness
100% UIS tested	Guarantees survival under worst-case inductive turn-off transients without derating
Low gate charge (Q_g = 43 nC @ 10 V)	Reduces driver power loss and enables efficient operation at 300–500 kHz switching frequencies
Fast body diode (t_rr = 25.7 ns)	Minimizes reverse recovery loss during synchronous rectification in boost and flyback topologies
TO-263 package with exposed drain	Provides 1.8 °C/W junction-to-case thermal resistance and mechanical stability for automated assembly

Applications

LED Backlighting Power Stage	Industrial DC-DC Boost Converter
Use Scenario: High-efficiency boost converter supplying 30–60 V to parallel LED strings in commercial signage and medical displays. IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to reduce forward voltage drop and improve efficiency above 85%. Use Value: Achieves ≤ 0.5 W conduction loss at 25 A output, reducing thermal load and enabling smaller heatsinks versus diode-based solutions.	Use Scenario: 24 V to 48 V isolated or non-isolated boost stage powering PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-side P-channel switch controlling energy transfer into output inductor; driven directly by microcontroller GPIO. Use Value: Eliminates need for external level shifter due to −2.4 V max V_GS(th), simplifying control circuitry and improving system reliability.
Telecom AC-DC Adapter Output Stage	Consumer Laptop Adapter Secondary Side
Use Scenario: Secondary-side synchronous rectification in 100–200 W telecom offline adapters operating at 100–132 kHz. IC Role / Device Role / Timing Role: Low-loss replacement for 60 V Schottky diodes in LLC resonant or quasi-resonant flyback outputs. Use Value: Reduces diode conduction loss by >60%, lowering secondary-side temperature rise by up to 15°C at full load.	Use Scenario: Compact 65 W laptop adapter using active clamp flyback with synchronous rectification on secondary side. IC Role / Device Role / Timing Role: P-channel MOSFET configured as self-driven synchronous rectifier, leveraging transformer reset voltage for gate control. Use Value: Enables ≥94% full-load efficiency while meeting CoC Tier 2 and DOE Level VI requirements without forced air cooling.

LED Backlighting Power Stage

Industrial DC-DC Boost Converter

Use Scenario: High-efficiency boost converter supplying 30–60 V to parallel LED strings in commercial signage and medical displays.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing Schottky diode to reduce forward voltage drop and improve efficiency above 85%.

Use Value: Achieves ≤ 0.5 W conduction loss at 25 A output, reducing thermal load and enabling smaller heatsinks versus diode-based solutions.

Use Scenario: 24 V to 48 V isolated or non-isolated boost stage powering PLC I/O modules and sensor interfaces.

IC Role / Device Role / Timing Role: High-side P-channel switch controlling energy transfer into output inductor; driven directly by microcontroller GPIO.

Use Value: Eliminates need for external level shifter due to −2.4 V max V_GS(th), simplifying control circuitry and improving system reliability.

Telecom AC-DC Adapter Output Stage

Consumer Laptop Adapter Secondary Side

Use Scenario: Secondary-side synchronous rectification in 100–200 W telecom offline adapters operating at 100–132 kHz.

IC Role / Device Role / Timing Role: Low-loss replacement for 60 V Schottky diodes in LLC resonant or quasi-resonant flyback outputs.

Use Value: Reduces diode conduction loss by >60%, lowering secondary-side temperature rise by up to 15°C at full load.

Use Scenario: Compact 65 W laptop adapter using active clamp flyback with synchronous rectification on secondary side.

IC Role / Device Role / Timing Role: P-channel MOSFET configured as self-driven synchronous rectifier, leveraging transformer reset voltage for gate control.

Use Value: Enables ≥94% full-load efficiency while meeting CoC Tier 2 and DOE Level VI requirements without forced air cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF4905PbF	R_DS(ON) = 75 mΩ @ −10 V; higher Q_g = 110 nC; TO-220 package	Larger footprint and higher conduction/switching loss; less suitable for high-density PCBs	Prefer AOB409L where board space, thermal performance, or efficiency >90% is required
SiHFP064	R_DS(ON) = 42 mΩ @ −10 V; lower I_D = −22 A; same TO-263 package	Lower current rating limits use in >20 A continuous applications; slightly higher R_DS(ON)	Acceptable for cost-sensitive designs with margin on current and thermal headroom

Compared with IRF4905PbF and SiHFP064, the AOB409L delivers superior R_DS(ON)/Q_g ratio and lower thermal resistance in the same D2PAK outline, making it optimal for compact, high-efficiency 30–50 A peak current boost and synchronous rectifier designs.

Availability

AOB409L is available at Aetrix Electronics and suitable for LED backlighting power stages, industrial DC-DC boost converters, and telecom AC-DC adapter output stages requiring stable component supply and long-term production continuity.

Supply support for AOB409L 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, industrial, and automotive markets.

The AOB409L belongs to AOS's advanced trench P-channel MOSFET product line, engineered specifically for high-efficiency, high-current synchronous rectification and high-side switching in space-constrained power conversion systems.

FAQ

What is the maximum continuous drain current rating for the AOB409L at 100°C case temperature?

The AOB409L supports −85 A pulsed drain current, but its continuous drain current at T_C = 100°C is −8.5 A per the Absolute Maximum Ratings table. This reflects thermal derating based on R_θJC = 1.8 °C/W and T_J(MAX) = 175°C. For sustained −31.5 A operation, case temperature must be maintained at or below 25°C via heatsinking.

Does the AOB409L have integrated ESD protection on the gate?

The AOB409L does not specify integrated gate ESD protection in its datasheet. Its gate-source voltage rating is ±20 V, and gate oxide integrity relies on proper handling and external gate protection (e.g., Zener clamps or RC snubbers) during PCB assembly and system operation. AOS recommends limiting transient gate voltage to within ±15 V during switching transitions.

Can the AOB409L be used in avalanche mode for energy recovery applications?

Yes - the AOB409L is 100% UIS (unclamped inductive switching) tested per JEDEC JESD24-11, confirming its capability to safely absorb inductive energy during turn-off. Its rated avalanche energy E_AS is specified under controlled test conditions (L = 0.1 mH, I_AR = −37 A), making it suitable for controlled avalanche circuits like snubberless flyback or active clamp topologies where energy recovery is intentional.

What is the typical body diode forward voltage of the AOB409L at −1 A?

The typical body diode forward voltage (V_SD) of the AOB409L is −0.72 V at I_S = −1 A and T_J = 25°C, as stated in the Electrical Characteristics table. This low V_SD contributes to reduced conduction loss during freewheeling intervals in synchronous rectifier applications, especially when compared to discrete Schottky diodes with ~0.45 V drop at same current.

Is the AOB409L RoHS compliant and halogen-free?

Yes - the AOB409L is RoHS compliant and halogen-free per AOS's product compliance documentation. It meets JEDEC JS-709C for halogen content (<900 ppm bromine, <900 ppm chlorine, total halogens <1500 ppm) and is manufactured using lead-free plating and molding compounds. Full compliance data is available in AOS's official material declarations.

AOB409L Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 5A (Ta), 31.5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 38mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 52 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2953 pF @ 30 V

FET Feature:: -

Power Dissipation (Max):: 2.1W (Ta), 83.3W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263 (D2PAK)

AOB409L FAQ

1.How can I place an order for AOB409L through Aetrix?

Please submit a Request for Quotation (RFQ) for AOB409L 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 AOB409L reliable?

The price and inventory of AOB409L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOB409L is usually 5 days.

3.What payment methods are accepted for AOB409L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOB409L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOB409L?

AOB409L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOB409L 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 AOB409L?

For technical support, including AOB409L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOB409L requirements.

6.How does Aetrix verify that AOB409L is sourced from the original manufacturer or authorized distributors?

All AOB409L 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 AOB409L meets industry standards.

7.What is the process for return or replacement of AOB409L?

All AOB409L units undergo pre-shipment inspection (PSI). If there is an issue with AOB409L, 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 AOB409L part is unused and in its original packaging.

Return procedure for AOB409L:

1.Submit a request within 90 days.

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

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