Alpha & Omega Semiconductor Inc. AOB414

Overview

AOB414 from Alpha & Omega Semiconductor is an N-channel SDMOS™ trench power MOSFET rated for 100 V drain-source voltage, 51 A continuous drain current at TC = 25°C, and RDS(ON) < 25 mΩ at VGS = 10 V. It features 100% UIS-tested ruggedness, low gate charge (Qg = 28 nC typ), and TO-263 (D2PAK) surface-mount package - optimized for high-efficiency PWM motor drives and DC-DC synchronous rectification.

For engineers reviewing the AOB414 datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 V breakdown rating, 51 A thermal-current capability, 25 mΩ on-resistance at 10 V gate drive, 1.0 °C/W junction-to-case thermal resistance, and suitability for high-frequency switching in industrial power supplies and BLDC motor controllers.

Technical Context

The AOB414 employs SDMOS™ trench technology to achieve low RDS(ON) and controlled switching behavior via minimized gate charge (Qg = 28 nC typ, Qgd = 10 nC typ) and fast transition times (tr = 4 ns, tf = 5 ns). Its body diode exhibits soft reverse recovery (trr = 20–37 ns, Qrr = 25–47 nC) with 100% avalanche-rated ruggedness (EAS = 150 mJ).

Thermal design is enabled by a 1.0 °C/W RθJC and 50 °C/W RθJA (on 1-in² FR-4 board), supporting continuous operation up to TJ = 175°C. The device is fully characterized for unclamped inductive switching (UIS), gate leakage (IGSS ≤ 100 nA), and gate threshold stability (VGS(th) = 2–4 V).

Key Specifications

Pinout & Package

AOB414 is housed in a TO-263 (D2PAK) surface-mount package with exposed drain pad for thermal and electrical connection. The package measures 10.16 mm × 15.37 mm × 4.83 mm and is RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP110N10F7 and IRF1404ZPBF, the AOB414 delivers optimal balance of low RDS(ON), fast switching, surface-mount compatibility, and factory-validated avalanche ruggedness - making it preferred for compact, high-frequency, high-reliability motor and power supply designs requiring D2PAK thermal performance.

Availability

AOB414 is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC-DC converters, and 48 V power distribution systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AOB414 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 modules for computing, consumer, industrial, and automotive markets.

The AOB414 belongs to AOS's SDMOS™ trench power MOSFET product line, engineered for high-efficiency, high-reliability switching in demanding power conversion and motor control applications.

FAQ

What is the maximum continuous drain current rating for the AOB414 at 100°C case temperature?

The AOB414 supports 28 A continuous drain current at TC = 100°C, as specified in the Absolute Maximum Ratings table. This de-rated value reflects thermal limitations under sustained high-temperature operation and must be validated against actual PCB copper area and airflow in the target application. The AOB414 datasheet confirms this rating applies with proper heatsinking and is distinct from its 51 A rating at TC = 25°C.

Does the AOB414 have a specified gate threshold voltage range, and how does it affect drive circuit design?

Yes, the AOB414 has a gate threshold voltage (VGS(th)) range of 2.0–4.0 V at ID = 250 µA. This means gate drive circuits must supply ≥4.5 V to ensure full enhancement across process and temperature variation, especially at TJ = 125°C. The AOB414's typical VGS(th) of 3.3 V enables compatibility with standard 5 V logic-level drivers while maintaining noise immunity above 2 V.

Is the AOB414 suitable for use in synchronous rectification, and what body diode characteristics support that function?

Yes, the AOB414 is explicitly suited for synchronous rectification due to its soft-recovery body diode: trr = 20–37 ns and Qrr = 25–47 nC (measured at IF = 20 A, dI/dt = 100–500 A/µs). These values - confirmed in the AOB414 datasheet's Dynamic Parameters table - minimize voltage overshoot and EMI, allowing reliable replacement of Schottky diodes in 300–600 kHz DC-DC converters without additional snubbing.

What thermal resistance values are specified for the AOB414, and how do they impact heatsink selection?

The AOB414 specifies RθJC = 1.0 °C/W (junction-to-case) and RθJA = 50 °C/W (junction-to-ambient, measured on 1-in² FR-4 board). The low RθJC indicates efficient heat transfer from die to package backside, making the AOB414 ideal for direct attachment to metal-core PCBs or bolt-down heatsinks. For ambient-limited designs, the 50 °C/W value sets the upper bound for allowable total system thermal resistance to maintain TJ ≤ 175°C.

How is avalanche ruggedness verified for the AOB414, and what energy level is guaranteed?

The AOB414 undergoes 100% Unclamped Inductive Switching (UIS) testing per JEDEC JESD24-11, guaranteeing a minimum single-pulse avalanche energy (EAS) of 150 mJ at TJ = 25°C. This rating - documented in the AOB414 datasheet's Absolute Maximum Ratings table - ensures reliable operation during inductive turn-off transients in motor drives and relay drivers without external protection components.