Alpha & Omega Semiconductor Inc. AOD452

Overview

AOD452 from Alpha & Omega Semiconductor is an N-channel enhancement-mode MOSFET in TO-252 (D-PAK) package, rated for 25 V V_DS, 55 A continuous drain current at T_C = 25°C, and R_DS(ON) < 8.5 mΩ at V_GS = 10 V. It features low gate charge (Q_g = 32 nC max), 100% UIS tested, and is optimized for PWM motor control and high-efficiency load switching in consumer-grade power supplies.

For engineers reviewing the AOD452 datasheet, pinout, applications, or equivalent options, key selection criteria include its 25 V breakdown voltage, 55 A thermal-limited current rating, trench-based low-R_DS(ON) performance, and suitability for compact DC-DC and battery protection circuits where fast switching and low conduction loss are critical.

Technical Context

The AOD452 employs advanced trench-gate process technology to achieve low on-resistance and high cell density while maintaining robust avalanche capability (E_AR = 61 mJ). Its gate threshold voltage (1.2–3.0 V) supports logic-level drive, and it delivers stable R_DS(ON) across temperature (11.5 mΩ max at 125°C, V_GS = 10 V).

Thermal design is supported by a low junction-to-case resistance (R_θJC = 2.9°C/W) and validated safe operating area up to 175°C junction temperature. The device includes integrated body diode with t_rr = 28 ns and Q_rr = 18 nC, enabling synchronous rectification in buck converters without external Schottky replacement.

Key Specifications

Pinout & Package

Package: TO-252 (D-PAK), surface-mount, single-drain-tab configuration with exposed thermal pad on bottom side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRLML6344TRPBF and DMN3025LSD-13, the AOD452 delivers 5× higher current capacity and 3× lower R_DS(ON) in a thermally superior TO-252 package-making it optimal for high-power consumer switching where thermal management and conduction loss dominate design trade-offs.

Availability

AOD452 is available at Aetrix Electronics and suitable for motor drive modules, USB-C power delivery switches, and battery protection circuits requiring stable component supply and consistent parametric performance across production batches.

Supply support for AOD452 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 consumer, computing, and industrial markets.

The AOD452 belongs to AOS's low-voltage trench MOSFET product line, engineered for high-current, high-efficiency switching in cost-sensitive consumer electronics where thermal density and gate drive simplicity are critical.

FAQ

What is the maximum continuous drain current rating for the AOD452?

The AOD452 has a maximum continuous drain current of 55 A at case temperature T_C = 25°C. At T_C = 100°C, this rating drops to 35 A due to thermal derating. The actual usable current depends on PCB layout, heatsinking, and ambient conditions-designers should reference the Figure 13 de-rating curve and ensure junction temperature remains ≤175°C. The AOD452's 2.9°C/W R_θJC enables robust thermal performance when mounted to a copper pour or external heatsink.

Does the AOD452 support logic-level gate drive?

Yes, the AOD452 supports logic-level gate drive with a gate threshold voltage V_GS(th) ranging from 1.2 V to 3.0 V. It delivers full enhancement (R_DS(ON) < 8.5 mΩ) at V_GS = 10 V and maintains usable conduction (R_DS(ON) < 14 mΩ) at V_GS = 4.5 V-making it compatible with standard 3.3 V and 5 V microcontrollers without external level shifters. This behavior is confirmed in the Figure 5 and Figure 3 characterization curves in the AOD452 datasheet.

Is the AOD452 suitable for avalanche-rated applications?

Yes, the AOD452 is 100% UIS (unclamped inductive switching) tested and rated for repetitive avalanche energy E_AR = 61 mJ with L = 0.1 mH. This specification validates its use in inductive load switching (e.g., solenoids, relays, motor windings) where voltage spikes exceed V_DS. The Figure 12 avalanche capability curve confirms safe operation up to 50 A peak current for pulse widths ≤100 µs. Designers must ensure gate drive remains active during avalanche to avoid thermal runaway.

What is the thermal resistance from junction to ambient (R_θJA) for the AOD452?

The AOD452 has a typical R_θJA of 50°C/W when mounted on a 1 in² FR-4 board with 2 oz. copper in still air (per Note H). However, this value is highly layout-dependent: adding thermal vias under the drain tab and increasing copper area can reduce R_θJA significantly. For thermal design, R_θJC = 2.9°C/W is more reliable-it defines the fixed junction-to-case path and enables accurate heatsink sizing when the tab is directly attached to metal.

Can the AOD452 be used as a synchronous rectifier?

Yes, the AOD452 is suitable as a synchronous rectifier due to its fast body diode characteristics: t_rr = 28 ns and Q_rr = 18 nC (measured at I_F = 20 A, dI/dt = 100 A/µs). These values enable efficient operation in buck converters up to 500 kHz, especially in discontinuous conduction mode (DCM). Its low R_DS(ON) further reduces forward conduction loss compared to Schottky diodes. The AOD452's gate charge profile (Q_g = 32 nC, Q_gd = 10 nC) also supports clean, low-loss turn-on timing when driven by dedicated gate controllers.