Alpha & Omega Semiconductor Inc. AONH36334

Overview

AONH36334 from Alpha & Omega Semiconductor is a 30V dual asymmetric N-channel MOSFET in a DFN3x3A package, integrating two discrete power switches with distinct R_DS(on) and current ratings (Q1: 16A/10.2mΩ, Q2: 18A/7.7mΩ at V_GS=10V) for high-efficiency synchronous rectification and half-bridge operation in DC/DC converters.

For engineers reviewing the AONH36334 datasheet, pinout, applications, or equivalent options, this device supports critical design decisions in computing POL supplies, telecom isolated DC/DC stages, and high-density power modules where low gate charge (Q_g(10V)=8–18nC), tight thermal resistance (R_θJC=4.2–5.4°C/W), and 100% UIS testing are essential selection criteria.

Technical Context

The AONH36334 implements a trench-based dual-channel architecture with independent Q1 and Q2 die optimized for asymmetrical conduction roles: Q1 serves as high-side switch with lower gate charge (Q_g(4.5V)=3.9–8.0nC), while Q2 delivers higher continuous current (18A) and lower on-resistance (7.7mΩ max at 10V). Both channels share identical 30V BVDSS rating and operate within -55°C to 150°C junction range.

Thermal performance is defined by separate junction-to-case resistances (Q1: 5.4°C/W, Q2: 5.0°C/W) and validated avalanche robustness (E_AS=5–15mJ), enabling reliable operation under transient overloads in unclamped inductive switching conditions without external snubbers.

Key Specifications

Pinout & Package

DFN3x3A package with bottom-side thermal pad and dual drain-source terminals. Pin assignment verified from official AOS top/bottom view diagrams (Rev.3.2, Oct 2023).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AONH36334, AON6920 sacrifices channel asymmetry for lower unit cost, while SiR626DP trades package size for marginally better R_DS(on) but reduced thermal headroom-making AONH36334 optimal for space-constrained, thermally aggressive POL and telecom applications.

Availability

AONH36334 is available at Aetrix Electronics and suitable for server point-of-load converters, telecom isolated DC/DC modules, and industrial motor drive half-bridges requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AONH36334 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, telecom, and industrial markets.

The AONH36334 belongs to AOS's Trench Power MOSFET family, engineered specifically for high-frequency, high-current DC/DC conversion where asymmetric channel optimization delivers measurable efficiency and thermal advantages over conventional dual-MOSFET solutions.

FAQ

What is the maximum continuous drain current rating for each channel of the AONH36334?

The AONH36334 specifies 16A continuous drain current for Q1 and 18A for Q2 at T_C=100°C. These values are limited by package thermal constraints-not silicon capability-and assume proper PCB copper area (1in² FR-4, 2oz Cu) for heat dissipation. At T_C=25°C, Q1 supports 72A and Q2 supports 80A in pulsed operation (t ≤ 10s), per the Absolute Maximum Ratings table.

Does the AONH36334 support 5V gate drive, and what is its R_DS(on) at that voltage?

Yes, the AONH36334 is fully specified for 4.5V gate drive: R_DS(on) is <15.8mΩ for Q1 and <11.6mΩ for Q2 at V_GS=4.5V and I_D=10A. This enables direct interfacing with standard 5V logic-level gate drivers without level-shifting circuitry, confirmed by Figure 5 in the datasheet showing R_DS(on) vs. V_GS curves down to 3V.

How is the common D1/S1/D2 terminal used in circuit design for the AONH36334?

The D1/S1/D2 terminal is an internal connection between Q1's drain, Q1's source, and Q2's drain-forming a shared node that enables cascode, half-bridge, or active-clamp topologies. In a typical half-bridge, this pin connects to the switching node; Q1's source (S1) is tied to the high-side rail, and Q2's source (S2) connects to ground. Layout must maintain low-inductance routing to this node to minimize voltage spikes.

What thermal metrics define the AONH36334's cooling requirements?

The AONH36334 provides two key thermal resistances: R_θJC = 5.4°C/W (Q1) and 5.0°C/W (Q2) for junction-to-case transfer, and R_θJA = 90°C/W (both channels) for junction-to-ambient on a 1in² FR-4 board with 2oz Cu. These values determine heatsink sizing (using R_θJC) or PCB copper area requirements (using R_θJA), with maximum junction temperature capped at 150°C.

Is the AONH36334 qualified for automotive applications?

The AONH36334 is not AEC-Q101 qualified and is not recommended for automotive safety-critical systems. Its -55°C to 150°C operating temperature range supports under-hood environments, but AOS does not certify it for ASIL-B or higher functional safety levels. For ADAS power supplies, it may be used in non-safety subsystems provided customer validation confirms reliability under required thermal and vibration profiles.