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

Alpha & Omega Semiconductor Inc. AOI442

Name: AOI442
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOI442
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOI442

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-251-3 Stub Leads, IPAK

Datasheet:: AOI442.pdf

Description:: MOSFET N-CH 60V 7A/37A TO251A

Quantity:: RFQ Add To RFQ list

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Inventory:3,573

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Product details

Overview

AOI442 from Alpha & Omega Semiconductor is a 60V N-Channel MOSFET fabricated with advanced trench technology, delivering R_DS(ON) < 20 mΩ at V_GS = 10 V and < 25 mΩ at V_GS = 4.5 V, with 37 A continuous drain current (T_A = 25°C). It serves as a high-efficiency load switch or PWM power stage in DC-DC converters and motor drivers.

For engineers reviewing the AOI442 datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-252 (DPAK) package thermal performance (R_θJC = 2.5°C/W), 100% UIS-tested ruggedness, gate charge (Q_g = 47.6 nC @ 10 V), and body-diode reverse recovery characteristics (t_rr = 41 ns, Q_rr = 46 nC).

Technical Context

The AOI442 operates as a unidirectional voltage-controlled switch with enhancement-mode N-channel topology. Its trench-gate structure enables low on-resistance and fast switching, supported by verified gate resistance (R_g = 0.65 Ω typ) and transconductance (g_FS = 65 S).

It features a robust 60 V V_DS rating, 175°C maximum junction temperature, and full avalanche energy rating (E_AS specified). The device includes 100% R_g and UIS testing for production reliability in repetitive inductive switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	60 V - Maximum blocking voltage before avalanche onset; defines usable input voltage range in buck converters and H-bridge arms.
R_DS(ON) @ V_GS=10 V	< 20 mΩ - Enables <1.5 W conduction loss at 30 A, critical for high-current 12–48 V systems.
I_D Continuous (T_A=25°C)	37 A - Package-limited current capacity under standard PCB mounting; supports >100 W power stages.
Q_g @ 10 V	47.6 nC - Determines gate drive power and switching speed; compatible with standard 1-A peak gate drivers.
t_rr / Q_rr	41 ns / 46 nC - Low reverse recovery charge minimizes shoot-through risk and EMI in synchronous rectification.
R_θJC	2.5°C/W - Enables direct heatsink attachment for >60 W continuous dissipation with minimal thermal interface resistance.

Pinout & Package

AOI442 is housed in a TO-252 (DPAK) surface-mount package with exposed drain pad for thermal and electrical performance. Pin assignment is standardized across AOS DPAK MOSFETs.

Pin/Terminal	Circuit Role	Design Meaning
G (Gate)	Control terminal	Receives voltage-controlled signal to modulate channel conductivity; requires ≤ ±20 V rating and low-impedance drive.
D (Drain)	High-side current path	Connected to load or bus side; electrically tied to exposed copper pad for thermal conduction and low-inductance return path.
S (Source)	Reference node	Serves as return path for load current and gate drive reference; must be routed with low inductance to minimize switching oscillation.

Key Features

Feature	Design Value
Advanced trench process	Enables sub-20 mΩ R_DS(ON) at 60 V while maintaining high cell density and gate oxide integrity.
100% UIS tested	Guarantees single-pulse unclamped inductive switching survival up to rated E_AS, critical for motor drive fault tolerance.
Low Q_gd/Q_g ratio	0.30 typ (14.4/47.6) - Reduces Miller-induced switching delay and improves hard-switching efficiency.
Body diode with soft recovery	t_rr = 41 ns, Q_rr = 46 nC - Limits voltage overshoot and ringing during freewheeling in synchronous buck topologies.

Applications

DC-DC Buck Converter	Brushed DC Motor Driver
Use Scenario: High-efficiency 12–48 V input to 3.3–15 V output conversion in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Synchronous high-side switch operating at 200–500 kHz with forced PWM control. Use Value: Sub-20 mΩ R_DS(ON) reduces conduction loss by >35% vs. legacy 60 V MOSFETs, enabling >95% peak efficiency at 20 A.	Use Scenario: Full-H-bridge driver for 24 V, 15 A brushed motors in automated gate actuators. IC Role / Device Role / Timing Role: Low-side switching element with fast turn-off (t_f = 5.5 ns) to minimize dead-time losses. Use Value: 100% UIS testing ensures survivability during motor stall and inductive kickback events without external snubbers.
LED Constant-Current Driver	Hot-Swap Controller
Use Scenario: High-brightness LED string regulation in outdoor signage with 36 V bus and 2 A per channel. IC Role / Device Role / Timing Role: Precision current-sense FET in constant-current sink configuration with analog dimming. Use Value: Tight V_GS(th) (1.6–2.7 V) and low R_DS(ON) tolerance enable stable current regulation across temperature without trimming.	Use Scenario: Inrush current limiting and fault protection in 48 V telecom shelf power distribution units. IC Role / Device Role / Timing Role: Load switch controlled by external hot-swap controller IC with precise current limiting. Use Value: 37 A continuous rating and 2.5°C/W R_θJC support 100+ W hot-plug operation with minimal derating on standard FR-4.

DC-DC Buck Converter

Brushed DC Motor Driver

Use Scenario: High-efficiency 12–48 V input to 3.3–15 V output conversion in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Synchronous high-side switch operating at 200–500 kHz with forced PWM control.

Use Value: Sub-20 mΩ R_DS(ON) reduces conduction loss by >35% vs. legacy 60 V MOSFETs, enabling >95% peak efficiency at 20 A.

Use Scenario: Full-H-bridge driver for 24 V, 15 A brushed motors in automated gate actuators.

IC Role / Device Role / Timing Role: Low-side switching element with fast turn-off (t_f = 5.5 ns) to minimize dead-time losses.

Use Value: 100% UIS testing ensures survivability during motor stall and inductive kickback events without external snubbers.

LED Constant-Current Driver

Hot-Swap Controller

Use Scenario: High-brightness LED string regulation in outdoor signage with 36 V bus and 2 A per channel.

IC Role / Device Role / Timing Role: Precision current-sense FET in constant-current sink configuration with analog dimming.

Use Value: Tight V_GS(th) (1.6–2.7 V) and low R_DS(ON) tolerance enable stable current regulation across temperature without trimming.

Use Scenario: Inrush current limiting and fault protection in 48 V telecom shelf power distribution units.

IC Role / Device Role / Timing Role: Load switch controlled by external hot-swap controller IC with precise current limiting.

Use Value: 37 A continuous rating and 2.5°C/W R_θJC support 100+ W hot-plug operation with minimal derating on standard FR-4.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFZ44NPBF	R_DS(ON) = 28 mΩ @ 10 V; higher Q_g (67 nC); TO-220 package	Larger footprint, lower current density, less suitable for compact high-frequency designs	Prefer AOI442 where board space, thermal resistance, or switching speed are constrained.
DMN6070LSD-13	R_DS(ON) = 19 mΩ @ 10 V but only 20 A I_D; SO-8 package; no UIS rating	Lower current capability and missing avalanche ruggedness limit use in motor or inductive loads	Select AOI442 when 37 A continuous current and 100% UIS validation are required.

Compared with IRFZ44NPBF and DMN6070LSD-13, the AOI442 delivers superior current density, lower thermal resistance, and production-validated avalanche robustness-making it optimal for space-constrained, high-reliability 60 V power switching where both conduction and switching losses must be minimized.

Availability

AOI442 is available at Aetrix Electronics and suitable for DC-DC converters, motor drives, LED drivers, and hot-swap controllers requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for AOI442 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 AOI442 belongs to AOS's TrenchMOS® family, engineered for high-efficiency, high-current switching in compact surface-mount power supplies and motor control systems.

FAQ

What is the maximum junction temperature rating for AOI442?

The AOI442 has a maximum junction temperature (T_J) of 175°C, validated across all absolute maximum ratings and thermal characterization curves. This rating enables operation in high-ambient environments such as enclosed industrial enclosures or under-hood automotive auxiliary systems, provided thermal design maintains T_J ≤ 175°C. The AOI442 datasheet specifies derating curves for power and current versus case temperature, confirming sustained operation up to this limit.

Does AOI442 support 4.5 V logic-level gate drive?

Yes, the AOI442 is fully characterized at V_GS = 4.5 V, with R_DS(ON) guaranteed at < 25 mΩ and I_D = 20 A. Its gate threshold voltage (V_GS(th)) ranges from 1.6 V to 2.7 V, ensuring reliable turn-on with standard 3.3 V or 5 V microcontroller outputs. This makes AOI442 suitable for direct interfacing with low-voltage logic without level-shifting circuitry.

Is AOI442 pin-compatible with AOD442?

Yes, AOI442 and AOD442 share identical TO-252 (DPAK) package dimensions, pinout (G-D-S), and thermal pad layout. Both devices are electrically and mechanically interchangeable in existing PCB designs. However, AOI442 is the isolated-gate variant optimized for enhanced isolation in high-noise environments, while AOD442 uses standard DPAK construction-designers should verify layout clearance requirements per application safety standards.

What is the body diode forward voltage of AOI442 at 20 A?

The AOI442 body diode forward voltage (V_SD) is 1.0 V typical at I_S = 20 A and T_J = 25°C, as confirmed in Figure 6 of the datasheet. At 125°C, V_SD drops to ~0.75 V due to negative temperature coefficient. This low V_SD reduces conduction loss during freewheeling in synchronous rectifier configurations and improves efficiency in bidirectional current paths.

How is avalanche ruggedness validated for AOI442?

Avalanche ruggedness for AOI442 is validated via 100% Unclamped Inductive Switching (UIS) testing per JEDEC JESD24-11. Each unit undergoes single-pulse inductive stress at rated I_AR and V_DS, with energy calculated as E = ½·L·I². The datasheet specifies E_AS and plots single-pulse avalanche capability (Figure 12), confirming robustness for motor commutation, relay driving, and other inductive load switching where voltage transients exceed V_DS.

AOI442 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-251-3 Stub Leads, IPAK

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 60 V

Current - Continuous Drain (Id) @ 25°C:: 7A (Ta), 37A (Tc)

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

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

Vgs(th) (Max) @ Id:: 2.7V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 68 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2300 pF @ 30 V

FET Feature:: -

Power Dissipation (Max):: 2.1W (Ta), 60W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251A

AOI442 FAQ

1.How can I place an order for AOI442 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOI442 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 AOI442 reliable?

The price and inventory of AOI442 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOI442 is usually 5 days.

3.What payment methods are accepted for AOI442?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOI442 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOI442?

AOI442 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOI442 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 AOI442?

For technical support, including AOI442 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOI442 requirements.

6.How does Aetrix verify that AOI442 is sourced from the original manufacturer or authorized distributors?

All AOI442 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 AOI442 meets industry standards.

7.What is the process for return or replacement of AOI442?

All AOI442 units undergo pre-shipment inspection (PSI). If there is an issue with AOI442, 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 AOI442 part is unused and in its original packaging.

Return procedure for AOI442:

1.Submit a request within 90 days.

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

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