Alpha & Omega Semiconductor Inc. AOK150V120X2Q

Overview

AOK150V120X2Q from Alpha & Omega Semiconductor is a 1200 V, 150 mΩ silicon carbide power MOSFET in TO-247-3L package, rated for 20 A continuous drain current at 25°C and 14 A at 100°C, with AEC-Q101 automotive qualification and 100% UIS testing - deployed in EV traction inverters and on-board chargers.

For engineers reviewing the AOK150V120X2Q datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.3 °C/W junction-to-case thermal resistance, 87.5 nC body diode Qrr, 28.3 nC total gate charge, and optimized 15 V gate drive compatibility for high-efficiency SiC switching in 800 V systems.

Technical Context

This αSiC MOSFET uses proprietary silicon carbide technology to deliver low conduction loss (R_DS(ON) = 150 mΩ typ at 25°C) and fast switching with low C_iss (664 pF), C_oss (42.2 pF), and Cr_ss (5.2 pF) at 800 V, enabling high-frequency operation in hard-switched topologies.

It supports transient gate voltages up to +20 V and −8 V, with recommended operating range of −5/+15 V, and features a low reverse recovery charge (Q_rr = 87.5 nC) and fast trr (39.5 ns), reducing switching losses and EMI in bidirectional power conversion stages.

Key Specifications

Pinout & Package

Package: TO-247-3L - industry-standard through-hole power package with isolated tab, optimized for high-current thermal and electrical performance in automotive and industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage SiC MOSFET applications.

Compared with C3M0120100K and STW48N120K5, the AOK150V120X2Q offers a balanced trade-off: mid-range R_DS(ON) (150 mΩ), industry-leading Q_rr/E_oss ratio, and proven thermal performance (1.3 °C/W) - making it optimal for space-constrained, thermally demanding automotive and industrial inverters where both conduction and switching losses must be tightly managed.

Availability

AOK150V120X2Q is available at Aetrix Electronics and suitable for xEV on-board chargers, EV traction inverters, and industrial motor drives requiring stable component supply across multi-year production cycles.

Supply support for AOK150V120X2Q 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-efficiency MOSFETs, IGBTs, and SiC devices for automotive, computing, and industrial markets.

The AOK150V120X2Q belongs to AOS's αSiC family, engineered specifically for high-reliability, high-voltage power conversion in electric vehicles and renewable energy systems where thermal robustness and switching efficiency are critical.

FAQ

What is the maximum continuous drain current rating for AOK150V120X2Q at 100°C case temperature?

The AOK150V120X2Q is rated for 14 A continuous drain current at T_C = 100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits under real-world heatsink conditions and ensures long-term reliability when operated within the 175°C maximum junction temperature. The AOK150V120X2Q maintains stable R_DS(ON) performance across this range due to its silicon carbide material properties.

Is AOK150V120X2Q suitable for use in AEC-Q101-compliant automotive systems?

Yes, the AOK150V120X2Q is explicitly AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and unbiased highly accelerated stress test (UHAST). Its 175°C maximum junction temperature, 100% UIS testing, and TO-247-3L package construction make it suitable for under-hood traction inverter and charger applications where automotive-grade reliability is mandatory. The AOK150V120X2Q meets all required failure mechanisms and lifetime validation criteria per AEC-Q101 Rev D.

What gate drive voltage is recommended for optimal performance of AOK150V120X2Q?

The recommended operating gate drive voltage for AOK150V120X2Q is −5 V (turn-off) and +15 V (turn-on), as stated in the datasheet's Absolute Maximum Ratings and Features sections. This range fully enhances the channel while maintaining safe margin below the +18 V absolute maximum. Driving the AOK150V120X2Q at +15 V achieves the specified 150 mΩ R_DS(ON) typ, whereas lower voltages increase on-resistance and conduction loss. The AOK150V120X2Q's low 2.1 Ω internal gate resistance supports fast switching with modest external gate driver capability.

How does the body diode performance of AOK150V120X2Q compare to silicon alternatives?

The AOK150V120X2Q features a low-Q_rr body diode (87.5 nC) and fast reverse recovery time (39.5 ns), significantly outperforming equivalent-voltage silicon MOSFETs, which typically exhibit Q_rr > 500 nC and trr > 100 ns. This enables efficient hard-commutation and reduces voltage overshoot and EMI in half-bridge topologies. The AOK150V120X2Q's SiC body diode also operates with lower forward voltage (V_SD = 4–5 V at 3.9 A) than Si counterparts, lowering freewheeling loss during dead-time intervals.

What thermal metrics define the cooling requirements for AOK150V120X2Q in high-power applications?

The AOK150V120X2Q has a maximum junction-to-case thermal resistance (R_θJC) of 1.3 °C/W, measured with the device mounted to a large heatsink. This value directly determines heatsink sizing: for example, dissipating 60 W at T_J = 175°C and T_C = 100°C requires a heatsink with ≤12.5 °C/W thermal resistance. The AOK150V120X2Q's low R_θJC enables compact thermal solutions in space-constrained EV modules, and its normalized transient impedance curve (Figure 18) supports accurate pulse-power thermal modeling.