Alpha & Omega Semiconductor Inc. AON7418A

Overview

AON7418A from Alpha & Omega Semiconductor is a 30V N-channel Trench Power AlphaMOS (αMOS LV) discrete MOSFET optimized for high-efficiency DC/DC conversion, featuring R_DS(on) < 1.7 mΩ at V_GS = 10 V and < 2.8 mΩ at V_GS = 4.5 V, 50 A continuous drain current, and low gate charge (Q_g = 47.7–65 nC). It serves as a primary synchronous rectifier or high-side switch in POL and isolated telecom DC/DC converters.

For engineers reviewing the AON7418A datasheet, pinout, applications, or equivalent options, key selection criteria include its DFN 3.3×3.3 EP package thermal performance (R_θJC = 1.5 °C/W), 100% UIS-tested ruggedness, and verified body-diode recovery (Q_rr = 46 nC, t_rr = 20 ns) for hard-switched topologies.

Technical Context

The AON7418A employs Alpha & Omega's latest αMOS LV trench technology to achieve ultra-low on-resistance with enhanced gate control-evidenced by g_FS = 153 S and V_GS(th) = 1.2–2.2 V (T_J = 25°C). Its dynamic parameters are characterized under standardized conditions: C_iss = 2994 pF, C_oss = 1276 pF, and Cr_ss = 196 pF at V_DS = 15 V.

Thermal design is supported by dual-rated power dissipation: P_D = 66 W (junction-to-case, R_θJC = 1.5 °C/W) and P_DSM = 83 W (junction-to-ambient, R_θJA = 55 °C/W on 1-in² FR-4, 2 oz Cu). The device is 100% R_g-tested and rated for TJ = –55 to +150°C operation.

Key Specifications

Pinout & Package

Package: DFN 3.3 × 3.3 mm with Exposed Pad (EP), thermally enhanced for low R_θJC = 1.5 °C/W. Pin 1 marked per top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BSC014N04LS6 and SiR872DP, the AON7418A delivers superior thermal performance (R_θJC = 1.5 °C/W) and tighter 4.5 V R_DS(on) spec (<2.8 mΩ), making it optimal for high-power-density, logic-level-driven DC/DC converters where junction temperature control is critical.

Availability

AON7418A is available at Aetrix Electronics and suitable for server point-of-load converters, telecom isolated DC/DC modules, and industrial motor drive gate drivers requiring stable component supply and qualified high-reliability MOSFETs.

Supply support for AON7418A 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 AON7418A belongs to AOS' αMOS LV (Low Voltage) trench MOSFET product line, engineered specifically for high-current, high-frequency DC/DC conversion where low R_DS(on), fast switching, and thermal efficiency are essential.

FAQ

What is the maximum continuous drain current rating for the AON7418A?

The AON7418A has a continuous drain current rating of 50 A at T_C = 25°C, limited by package thermal capacity. At T_C = 100°C, the derated current is 39 A, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB layout with adequate copper area for the exposed drain pad. The AON7418A must be operated within these thermal limits to maintain reliability and avoid junction overheating.

Does the AON7418A support 5 V gate drive in practical applications?

Yes, the AON7418A supports robust 5 V gate drive due to its R_DS(on) < 2.8 mΩ at V_GS = 4.5 V and gate threshold voltage V_GS(th) = 1.2–2.2 V (25°C). This ensures full enhancement with standard logic-level controllers. The AON7418A also features low Q_gd (10 nC), minimizing Miller plateau effects during 5 V switching-critical for stable operation in high-frequency synchronous rectifiers and POL converters.

What thermal metrics define the AON7418A's cooling performance?

The AON7418A provides two key thermal metrics: R_θJC = 1.5 °C/W (junction-to-case) and R_θJA = 55 °C/W (junction-to-ambient on 1-in² FR-4, 2 oz Cu). The low R_θJC enables direct heatsinking via the exposed drain pad, while R_θJA guides PCB-level thermal design. These values are validated per JEDEC standards and directly impact the AON7418A's usable power dissipation in real-world layouts.

Is the AON7418A suitable for unclamped inductive switching (UIS) applications?

Yes, the AON7418A is 100% UIS tested with a guaranteed E_AS rating of 109 mJ at T_J = 25°C. This makes it suitable for hard-switched topologies such as flyback, forward, and active clamp converters where inductive energy must be safely absorbed by the MOSFET. The AON7418A's ruggedness eliminates the need for external clamping circuits in many industrial and telecom power designs.

How does the AON7418A's body-diode performance compare to standard MOSFETs?

The AON7418A features optimized body-diode characteristics: V_SD = 0.7–1.0 V at I_S = 1 A, t_rr = 20 ns, and Q_rr = 46 nC (I_F = 20 A, dI/dt = 500 A/μs). These values are significantly improved over generic MOSFETs, enabling efficient synchronous rectification and reducing reverse-recovery-related losses and EMI. In the AON7418A, this translates to measurable efficiency gains in secondary-side switching applications.