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

Alpha & Omega Semiconductor Inc. AOD9T40P

Name: AOD9T40P
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOD9T40P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOD9T40P

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: AOD9T40P.pdf

Description:: MOSFET N-CH 400V 6.6A TO252

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Product details

Overview

AOD9T40P from Alpha & Omega Semiconductor is a 400 V, 6.6 A N-channel Trench Power AlphaMOS-II MOSFET in TO-252 (DPAK) package, featuring R_DS(ON) ≤ 0.8 Ω at V_GS = 10 V, 9 nC typical gate charge, and 100% UIS-tested ruggedness-designed for high-efficiency AC/DC power supplies and LED lighting drivers.

For engineers reviewing the AOD9T40P datasheet, pinout, applications, or equivalent options, key selection criteria include its 500 V V_DS rating, 26 A pulsed drain current, low C_iss/C_rss, RoHS-compliant construction, and thermal resistance of R_θJC = 1.5 °C/W for heatsink-integrated industrial power designs.

Technical Context

The AOD9T40P employs Trench Power AlphaMOS-II technology to achieve low on-resistance and fast switching with C_iss = 530 pF and C_rss = 2.8 pF at V_DS = 100 V, enabling high-frequency operation in flyback and PFC stages. Its 1.5 µJ E_oss at 320 V supports efficient hard-switched topologies.

Rated for 150 °C maximum junction temperature, it delivers 83 W power dissipation at T_C = 25 °C with R_θJC = 1.5 °C/W, and exhibits robust dv/dt ruggedness (300 V/ns) and body-diode recovery time t_rr = 233 ns under I_F = 6.6 A, dI/dt = 100 A/µs conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Maximum blocking voltage for primary-side switching in 380 V DC bus applications
R_DS(ON)	≤ 0.8 Ω @ V_GS = 10 V - Enables <1.5 W conduction loss at 6.6 A continuous current
Q_g	9 nC typ - Reduces gate drive power and enables 500 kHz+ PWM operation with low-side driver ICs
E_oss	1.5 µJ @ 320 V - Low output capacitance energy minimizes turn-off losses in hard-switched converters
I_D	6.6 A continuous - Sustains full-load current in 65–100 W LED drivers and auxiliary power supplies
t_rr	233 ns - Limits reverse recovery ringing and EMI in synchronous rectification and freewheeling paths
R_θJC	1.5 °C/W - Allows direct mounting to heatsink for thermal management without thermal interface material penalty

Pinout & Package

TO-252 (DPAK) surface-mount package with exposed drain pad for thermal enhancement and mechanical stability.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Controls channel conduction; requires 10 V drive for full R_DS(ON) specification
D	Drain	Main high-voltage current path; electrically connected to exposed pad for thermal and electrical sinking
S	Source	Reference node for gate drive and current sensing; tied to power ground in low-side configurations

Key Features

Feature	Design Value
Trench Power AlphaMOS-II process	Delivers optimized trade-off between R_DS(ON), Q_g, and C_oss for 400 V-class SMPS
100% UIS tested	Guarantees unclamped inductive switching survival up to 252 mJ at T_J = 150 °C
100% R_g tested	Ensures consistent gate resistance (2.3 Ω typ) for predictable switching timing and EMI control
RoHS & halogen-free	Complies with IPC-1752A material declaration requirements for consumer and industrial end equipment
Low C_iss/C_rss ratio	530 pF / 2.8 pF = ~189:1 - Improves Miller immunity and reduces false turn-on risk in high-dv/dt environments

Applications

LED Lighting Driver	Industrial AC/DC Adapter
Use Scenario: Constant-current buck or flyback driver for commercial LED luminaires operating from 230 VAC input. IC Role / Device Role: Primary-side high-voltage switch regulating LED string current via primary-side sensing. Use Value: 400 V V_DS and 6.6 A I_D support 80–100 W output with >90% efficiency; low Q_g enables compact gate driver design.	Use Scenario: 36 V/3 A isolated adapter for PLC I/O modules and factory automation sensors. IC Role / Device Role: Main switch in active-clamp forward or LLC resonant converter delivering regulated 36 V output. Use Value: 500 V BVDSS margin ensures reliability across 400 V DC link transients; 1.5 °C/W R_θJC simplifies thermal design on metal-core PCB.
Consumer Telecom PSU	CCFL Backlight Inverter
Use Scenario: 12 V/5 A standby and main power supply in VoIP gateways and fiber ONTs. IC Role / Device Role: Primary-side switch in quasi-resonant flyback topology meeting CoC Tier 2 efficiency standards. Use Value: 9 nC Q_g and 233 ns t_rr reduce switching losses below 100 kHz, easing EMI filter sizing and cost.	Use Scenario: High-frequency half-bridge inverter driving cold-cathode fluorescent lamps in legacy LCD monitors. IC Role / Device Role: Low-side switch in push-pull configuration with integrated bootstrap diode path. Use Value: 26 A I_DM handles peak lamp ignition currents; 300 V/ns dv/dt ruggedness prevents spurious turn-on during rapid voltage transitions.

LED Lighting Driver

Industrial AC/DC Adapter

Use Scenario: Constant-current buck or flyback driver for commercial LED luminaires operating from 230 VAC input.

IC Role / Device Role: Primary-side high-voltage switch regulating LED string current via primary-side sensing.

Use Value: 400 V V_DS and 6.6 A I_D support 80–100 W output with >90% efficiency; low Q_g enables compact gate driver design.

Use Scenario: 36 V/3 A isolated adapter for PLC I/O modules and factory automation sensors.

IC Role / Device Role: Main switch in active-clamp forward or LLC resonant converter delivering regulated 36 V output.

Use Value: 500 V BVDSS margin ensures reliability across 400 V DC link transients; 1.5 °C/W R_θJC simplifies thermal design on metal-core PCB.

Consumer Telecom PSU

CCFL Backlight Inverter

Use Scenario: 12 V/5 A standby and main power supply in VoIP gateways and fiber ONTs.

IC Role / Device Role: Primary-side switch in quasi-resonant flyback topology meeting CoC Tier 2 efficiency standards.

Use Value: 9 nC Q_g and 233 ns t_rr reduce switching losses below 100 kHz, easing EMI filter sizing and cost.

Use Scenario: High-frequency half-bridge inverter driving cold-cathode fluorescent lamps in legacy LCD monitors.

IC Role / Device Role: Low-side switch in push-pull configuration with integrated bootstrap diode path.

Use Value: 26 A I_DM handles peak lamp ignition currents; 300 V/ns dv/dt ruggedness prevents spurious turn-on during rapid voltage transitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP4NK40ZFP	400 V, 3.5 A, R_DS(ON) = 1.4 Ω, Q_g = 12 nC, TO-220FP package	Lower current rating and higher R_DS(ON); requires larger heatsink for same power level	Preferred where through-hole assembly and higher surge tolerance are prioritized over board space
IRF640NPBF	500 V, 18 A, R_DS(ON) = 0.18 Ω, Q_g = 67 nC, TO-220 package	Higher current and lower R_DS(ON), but 7.5× higher gate charge increases driver complexity and switching loss	Selected when conduction loss dominates and gate drive capability supports high Q_g

Compared with STP4NK40ZFP and IRF640NPBF, the AOD9T40P offers optimal balance of current capability (6.6 A), low gate charge (9 nC), and surface-mount TO-252 packaging-making it especially suitable for space-constrained, medium-power AC/DC converters where thermal performance and EMI control are critical.

Availability

AOD9T40P is available at Aetrix Electronics and suitable for LED lighting drivers, industrial AC/DC adapters, and consumer telecom power supplies requiring stable component supply and long-term production continuity.

Supply support for AOD9T40P 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 AOD9T40P belongs to AOS's Trench Power AlphaMOS-II family, engineered for high-efficiency, high-reliability switching in medium-voltage AC/DC and DC/DC power conversion systems.

FAQ

What is the maximum continuous drain current rating for the AOD9T40P?

The AOD9T40P has a maximum continuous drain current I_D of 6.6 A at T_C = 25 °C. This rating assumes proper heatsinking and derates linearly above 25 °C per the curve in Figure 12 of the datasheet, reaching zero at T_C = 150 °C. The AOD9T40P also supports 26 A pulsed drain current (I_DM) for short-duration events.

Does the AOD9T40P have avalanche capability, and how is it rated?

Yes, the AOD9T40P is 100% UIS (unclamped inductive switching) tested and rated for repetitive avalanche energy E_AR = 50 mJ and single-pulsed avalanche energy E_AS = 252 mJ at T_J = 25 °C. These values are measured under standardized test conditions (L = 1 mH, I_AR = 6.6 A) and confirm ruggedness against inductive load transients in real-world AOD9T40P applications.

What is the gate threshold voltage range for the AOD9T40P?

The AOD9T40P has a gate threshold voltage V_GS(th) ranging from 3 V to 5 V at I_D = 250 µA and T_J = 25 °C. This ensures reliable turn-on with standard 5 V or 10 V logic-level gate drivers while maintaining noise immunity-critical for stable operation in noisy industrial AOD9T40P power supply environments.

Can the AOD9T40P be used in surface-mount reflow processes, and what is its lead temperature limit?

Yes, the AOD9T40P in TO-252 package is qualified for standard Pb-free reflow soldering. Its maximum lead temperature is 250 °C for 5 seconds at 1/8" from the case, per JEDEC J-STD-020. This allows compatibility with common IR and vapor-phase reflow profiles used for AOD9T40P assembly in high-volume LED driver and adapter manufacturing.

How does the AOD9T40P's body diode performance compare to discrete Schottky alternatives?

The AOD9T40P features an integrated body diode with V_SD = 0.77 V typ at I_S = 1 A and T_J = 25 °C, and t_rr = 233 ns under specified conditions. While not as fast or low-V_F as dedicated Schottky diodes, its co-packaged integration eliminates layout parasitics and simplifies PCB routing in flyback snubber or freewheeling paths where AOD9T40P serves dual switching/diode roles.

AOD9T40P Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 6.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 800mOhm @ 4A, 10V

Vgs(th) (Max) @ Id:: 5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 18 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 530 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 83W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

AOD9T40P FAQ

1.How can I place an order for AOD9T40P through Aetrix?

Please submit a Request for Quotation (RFQ) for AOD9T40P 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 AOD9T40P reliable?

The price and inventory of AOD9T40P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD9T40P is usually 5 days.

3.What payment methods are accepted for AOD9T40P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD9T40P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOD9T40P?

AOD9T40P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOD9T40P 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 AOD9T40P?

For technical support, including AOD9T40P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD9T40P requirements.

6.How does Aetrix verify that AOD9T40P is sourced from the original manufacturer or authorized distributors?

All AOD9T40P 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 AOD9T40P meets industry standards.

7.What is the process for return or replacement of AOD9T40P?

All AOD9T40P units undergo pre-shipment inspection (PSI). If there is an issue with AOD9T40P, 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 AOD9T40P part is unused and in its original packaging.

Return procedure for AOD9T40P:

1.Submit a request within 90 days.

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

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