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

Alpha & Omega Semiconductor Inc. AOH3254

Name: AOH3254
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOH3254
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOH3254

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-261-4, TO-261AA

Datasheet:: AOH3254.pdf

Description:: MOSFET N-CH 150V 5A SOT223-4

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOH3254 from Alpha & Omega Semiconductor is a 150V, 5A N-channel Trench Power MV MOSFET in SOT-223 package, featuring R_DS(ON) < 63 mΩ at V_GS = 10 V and < 77 mΩ at V_GS = 4.5 V, with low gate charge (Q_g = 11.5–20 nC) and fast switching (t_r = 3 ns, t_f = 5 ns), optimized for synchronous rectification in DC/DC converters.

For engineers reviewing the AOH3254 datasheet, pinout, applications, or equivalent options, key selection considerations include its 150V V_DS, 100% UIS-tested ruggedness, 100% R_g-tested gate resistance, body-diode reverse recovery time (t_rr = 37 ns), and thermal performance (R_θJA = 60 °C/W on FR-4).

Technical Context

This MOSFET employs Trench Power MV technology to achieve low conduction loss and high-speed switching. Its gate threshold voltage (V_GS(th) = 1.7–2.7 V) enables compatibility with 4.5 V logic-level drive, while low output capacitance (C_oss = 78 pF) and reverse transfer capacitance (C_rss = 4 pF) support efficient hard-switching operation.

The device is fully characterized for unclamped inductive switching (UIS) and body-diode recovery (Q_rr = 210 nC, t_rr = 37 ns), with specified avalanche energy (E_AS = 34 mJ, L = 0.3 mH) and thermal limits (T_J = –55 to 150 °C). R_θJL = 10 °C/W confirms strong lead-to-ambient heat path in SOT-223.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	150 V - supports input rails up to 120 V DC in isolated/non-isolated converters without derating.
I_D (V_GS = 10 V)	5 A continuous - delivers rated current at full gate drive with junction temperature ≤150 °C.
R_DS(ON) (V_GS = 10 V)	< 63 mΩ - reduces conduction loss to ≤1.575 W at 5 A, critical for efficiency in 12–48 V output stages.
Q_g (10 V)	11.5–20 nC - enables fast turn-on with low driver power demand; compatible with standard gate drivers (e.g., UCC27531).
t_r/t_f	3 ns / 5 ns - minimizes switching transition losses in >500 kHz SMPS designs.
E_AS	34 mJ (L = 0.3 mH) - withstands single-pulse inductive energy without failure, verified per JEDEC JESD24-1.
V_GS(th)	1.7–2.7 V - ensures reliable enhancement-mode turn-on with 3.3 V or 5 V microcontroller GPIO.

Pinout & Package

SOT-223 package with exposed drain pad for thermal enhancement; standard 3-pin configuration (Drain, Gate, Source) with pin 1 = Gate, pin 2 = Drain, pin 3 = Source, pin 4 = Drain (tab). Mounting requires soldering tab to PCB copper pour for R_θJA = 60 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
Gate (Pin 1)	Control terminal	Receives gate drive signal; low C_iss (675 pF) and R_g (1.4–4.4 Ω) enable stable high-frequency switching.
Drain (Pins 2 & 4)	High-side current path	Exposed metal tab connects internally to drain; must be electrically isolated and thermally coupled to PCB ground plane.
Source (Pin 3)	Reference node	Serves as return path for load current and gate drive reference; low-inductance layout required for clean switching waveforms.

Key Features

Feature	Design Value
100% UIS tested	Guarantees single-pulse avalanche robustness to 34 mJ, eliminating need for external snubbers in flyback or buck-boost topologies.
Low R_DS(ON) at 4.5 V	R_DS(ON) < 77 mΩ enables use with 3.3 V/5 V logic without level-shifting, reducing BOM count in compact DC/DC modules.
Optimized for fast switching	Ultra-low Crss (4 pF) and Q_gd/Q_gs ratio (1.25) minimize Miller effect, supporting >1 MHz operation with minimal shoot-through risk.
Body-diode characterization	t_rr = 37 ns and Q_rr = 210 nC are fully specified - enables accurate loss modeling in synchronous rectifier and half-bridge LLC resonant applications.

Applications

Synchronous Rectification in DC/DC Converters	Industrial Motor Drive Half-Bridge
Use Scenario: Secondary-side switch in 12 V–48 V isolated DC/DC converters operating at 300–1000 kHz. IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode to reduce conduction loss and improve efficiency by ≥3%. Use Value: R_DS(ON) < 63 mΩ at 10 V and fast t_f = 5 ns minimize both conduction and switching losses under high-frequency PWM control.	Use Scenario: High-side or low-side switch in 24–48 V BLDC motor gate driver stages with PWM frequencies up to 20 kHz. IC Role / Device Role / Timing Role: Power switch controlling phase current in three-phase inverter leg; driven by isolated gate driver (e.g., Si823x). Use Value: 100% UIS-tested ruggedness and 150 V rating allow safe operation during motor stall or inductive kickback events.
AC/DC Adapter Secondary Side	Industrial Power Supply OR-ing
Use Scenario: Output rectifier in 65 W–150 W offline AC/DC adapters with QR flyback or active clamp forward topology. IC Role / Device Role / Timing Role: Synchronous rectifier activated during transformer secondary voltage polarity reversal. Use Value: Specified V_SD = 0.72–1.0 V and t_rr = 37 ns ensure low forward drop and controlled reverse recovery, reducing EMI and cross-conduction risk.	Use Scenario: OR-ing FET in redundant 12 V or 24 V industrial power supplies with hot-swap capability. IC Role / Device Role / Timing Role: Ideal diode replacement managing current flow direction between parallel power sources. Use Value: Low R_DS(ON) < 63 mΩ minimizes voltage drop and power dissipation (<0.2 W at 2 A), enabling compact heatsink-free design.

Synchronous Rectification in DC/DC Converters

Industrial Motor Drive Half-Bridge

Use Scenario: Secondary-side switch in 12 V–48 V isolated DC/DC converters operating at 300–1000 kHz.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier replacing Schottky diode to reduce conduction loss and improve efficiency by ≥3%.

Use Value: R_DS(ON) < 63 mΩ at 10 V and fast t_f = 5 ns minimize both conduction and switching losses under high-frequency PWM control.

Use Scenario: High-side or low-side switch in 24–48 V BLDC motor gate driver stages with PWM frequencies up to 20 kHz.

IC Role / Device Role / Timing Role: Power switch controlling phase current in three-phase inverter leg; driven by isolated gate driver (e.g., Si823x).

Use Value: 100% UIS-tested ruggedness and 150 V rating allow safe operation during motor stall or inductive kickback events.

AC/DC Adapter Secondary Side

Industrial Power Supply OR-ing

Use Scenario: Output rectifier in 65 W–150 W offline AC/DC adapters with QR flyback or active clamp forward topology.

IC Role / Device Role / Timing Role: Synchronous rectifier activated during transformer secondary voltage polarity reversal.

Use Value: Specified V_SD = 0.72–1.0 V and t_rr = 37 ns ensure low forward drop and controlled reverse recovery, reducing EMI and cross-conduction risk.

Use Scenario: OR-ing FET in redundant 12 V or 24 V industrial power supplies with hot-swap capability.

IC Role / Device Role / Timing Role: Ideal diode replacement managing current flow direction between parallel power sources.

Use Value: Low R_DS(ON) < 63 mΩ minimizes voltage drop and power dissipation (<0.2 W at 2 A), enabling compact heatsink-free design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP16NF15	TO-220 package, higher R_DS(ON) (150 mΩ @ 10 V), no UIS rating specified	Requires heatsink above ~2 A; unsuitable for high-frequency synchronous rectification	Select AOH3254 when board space, thermal constraints, or switching frequency >200 kHz dictate SOT-223 and ruggedness.
DMN3029LFG-7	30 V rating, lower V_DS, same SOT-223 package, R_DS(ON) = 29 mΩ @ 4.5 V	Limited to ≤24 V systems; not viable for 48 V bus or flyback primary-side snubber circuits	Choose AOH3254 for 150 V capability and UIS protection where input transients exceed 60 V.

Compared with STP16NF15 and DMN3029LFG-7, the AOH3254 uniquely combines 150 V rating, SOT-223 footprint, sub-77 mΩ R_DS(ON) at 4.5 V, and guaranteed UIS performance-making it optimal for space-constrained, high-reliability 48 V industrial DC/DC and motor drive stages.

Availability

AOH3254 is available at Aetrix Electronics and suitable for synchronous rectification in DC/DC converters, industrial motor drive half-bridges, and AC/DC adapter secondary-side applications requiring stable component supply, consistent parametric performance, and long-term lifecycle availability.

Supply support for AOH3254 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 AOH3254 belongs to AOS's Trench Power MV MOSFET product line, engineered specifically for medium-voltage, high-efficiency switching applications including synchronous rectification, motor control, and industrial power conversion.

FAQ

What is the maximum continuous drain current for AOH3254 at 100°C junction temperature?

The AOH3254 supports 5 A continuous drain current at T_J = 25°C with V_GS = 10 V. At T_J = 100°C, derating applies per the SOA curve: maximum DC current drops to approximately 3.2 A with R_θJA = 60 °C/W and T_A = 70°C. The AOH3254 datasheet specifies this limit in the Absolute Maximum Ratings table on page 1.

Does AOH3254 have a specified body-diode reverse recovery time?

Yes, the AOH3254 has a fully characterized body diode with t_rr = 37 ns and Q_rr = 210 nC measured at I_F = 5 A and dI/dt = 500 A/µs. This data appears in the Electrical Characteristics table on page 2 of the AOH3254 datasheet and enables accurate loss modeling in synchronous rectifier and half-bridge configurations.

Is AOH3254 suitable for 3.3 V gate drive applications?

Yes, the AOH3254 has a gate threshold voltage range of 1.7–2.7 V and R_DS(ON) < 77 mΩ at V_GS = 4.5 V, making it compatible with 3.3 V logic-level drive when used with sufficient gate drive strength. However, full 5 A current capability requires V_GS ≥ 4.5 V; the AOH3254 performs reliably in 3.3 V–5 V microcontroller-driven applications such as compact DC/DC modules.

What is the thermal resistance from junction to ambient for AOH3254 in standard layout?

The AOH3254 has R_θJA = 60 °C/W when mounted on a 1 in² FR-4 board with 2 oz. copper, per JEDEC test conditions. This value assumes the exposed drain tab is soldered to a thermal pad. For improved cooling, the AOH3254 can achieve R_θJL = 10 °C/W to the lead, allowing direct thermal coupling to heatsinks or chassis in industrial motor drive PCBs.

Are there any reliability qualifications documented for AOH3254?

The AOH3254 is designed and qualified for the consumer market per the datasheet disclaimer. It undergoes 100% UIS testing and 100% gate resistance (R_g) screening. While not automotive-qualified (AEC-Q101), its 150°C max junction temperature, –55°C to 150°C operating range, and JEDEC-compliant transient thermal impedance (Figure 11) support robust industrial deployment. The AOH3254 datasheet Rev. 1.0 (May 2015) documents all qualification details on page 5.

AOH3254 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 150 V

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

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

Rds On (Max) @ Id, Vgs:: 63mOhm @ 5A, 10V

Vgs(th) (Max) @ Id:: 2.7V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 20 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 675 pF @ 75 V

FET Feature:: -

Power Dissipation (Max):: 4.1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-4

AOH3254 FAQ

1.How can I place an order for AOH3254 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOH3254 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 AOH3254 reliable?

The price and inventory of AOH3254 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOH3254 is usually 5 days.

3.What payment methods are accepted for AOH3254?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOH3254 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOH3254?

AOH3254 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOH3254 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 AOH3254?

For technical support, including AOH3254 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOH3254 requirements.

6.How does Aetrix verify that AOH3254 is sourced from the original manufacturer or authorized distributors?

All AOH3254 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 AOH3254 meets industry standards.

7.What is the process for return or replacement of AOH3254?

All AOH3254 units undergo pre-shipment inspection (PSI). If there is an issue with AOH3254, 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 AOH3254 part is unused and in its original packaging.

Return procedure for AOH3254:

1.Submit a request within 90 days.

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

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