Alpha & Omega Semiconductor Inc. AOD2816

Overview

AOD2816 from Alpha & Omega Semiconductor is an 80V N-channel Trench MOSFET optimized for high-frequency switching in power conversion stages, featuring R_DS(ON) < 15 mΩ at V_GS = 10 V, 35 A continuous drain current, and 100% UIS-tested ruggedness. It serves as a primary switch or synchronous rectifier in boost converters and LED backlighting systems.

For engineers reviewing the AOD2816 datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge (Q_g = 14.5–22 nC), fast switching (t_r = 4 ns, t_f = 3 ns), and TO-252 (DPAK) thermal performance with R_θJC = 2.8 °C/W.

Technical Context

The AOD2816 employs trench-gate silicon technology to simultaneously minimize conduction loss (via ultra-low R_DS(ON)) and switching loss (via low C_iss = 1109 pF, C_oss = 154 pF, and Q_g = 14.5–22 nC). Its gate threshold voltage (2.5–3.5 V) supports 4.5 V logic-level drive compatibility while maintaining noise immunity.

Designed for unclamped inductive switching (UIS) reliability, the device undergoes 100% avalanche testing (E_AS rated) and 100% gate resistance (R_g) screening. The body diode exhibits V_SD = 0.74–1.0 V at I_S = 1 A and t_rr = 30 ns with Q_rr = 122 nC, enabling efficient synchronous rectification without external Schottky replacement.

Key Specifications

Pinout & Package

Package: TO-252 (DPAK), surface-mount, single-drain tab design with exposed drain pad for thermal conduction and mechanical anchoring.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP80NF55-08 and IRFZ44NPBF, the AOD2816 delivers superior high-frequency efficiency due to its lower R_DS(ON) × Q_g product and TO-252 thermal interface-enabling smaller PCB area, higher power density, and elimination of mechanical heatsinks in most 80 V applications.

Availability

AOD2816 is available at Aetrix Electronics and suitable for boost converters, synchronous rectifiers, LED backlighting, and industrial power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AOD2816 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, consumer, industrial, and telecom markets.

The AOD2816 belongs to AOS's TrenchMOS® family, engineered specifically for high-efficiency, high-frequency DC-DC conversion and synchronous rectification in compact, thermally constrained power systems.

FAQ

What is the maximum junction temperature rating for the AOD2816?

The AOD2816 has a maximum junction temperature (T_J) rating of 175 °C, validated across all absolute maximum ratings and thermal characterization curves. This allows operation in high-ambient environments such as enclosed industrial power supplies. Derating begins at T_C = 100 °C per the power de-rating curve on page 4 of the official AOS datasheet for AOD2816. Thermal design must respect R_θJC = 2.8 °C/W and maintain case temperature within limits to avoid exceeding 175 °C at the die.

Is the AOD2816 suitable for 4.5 V logic-level gate drive?

Yes, the AOD2816 supports 4.5 V logic-level drive: its gate threshold voltage (V_GS(th)) is specified from 2.5 V to 3.5 V, and R_DS(ON) remains < 29 mΩ at V_GS = 6 V. At V_GS = 4.5 V, typical R_DS(ON) is ~22 mΩ (per Figure 5), enabling use with 3.3 V or 5 V microcontrollers and gate drivers without level-shifting. However, full 35 A current capability requires V_GS ≥ 10 V per datasheet conditions.

Does the AOD2816 have avalanche capability, and is it tested?

Yes, the AOD2816 is rated for unclamped inductive switching (UIS) and undergoes 100% avalanche testing per AOS qualification standards. The datasheet specifies E_AS (avalanche energy) as a rated parameter and provides single-pulse avalanche capability curves (Figure 12). This makes the AOD2816 suitable for flyback, boost, and other topologies where inductive energy must be safely absorbed during switching transitions without external snubbers.

What is the thermal resistance from junction to ambient (R_θJA) for the AOD2816 in standard layout?

The AOD2816 has R_θJA = 50 °C/W when mounted on a 1 in² FR-4 board with 2 oz. copper in still air (TA = 25 °C), per Note H on page 2 of the datasheet. This value assumes no additional heatsinking and defines the upper bound for natural-convection cooling. For improved thermal performance, the exposed drain pad should be connected to a large copper pour or internal plane; actual R_θJA will vary based on PCB layout, airflow, and copper area.

Can the AOD2816 replace the AOD2814 in an existing design?

The AOD2816 is not a direct drop-in replacement for the AOD2814: although both are 80 V N-channel TO-252 MOSFETs, the AOD2814 has R_DS(ON) < 12 mΩ at V_GS = 10 V and higher I_D = 42 A. Substituting AOD2816 may increase conduction loss and require thermal re-evaluation. No pinout or package differences exist, but electrical validation-including gate drive strength, SOA, and thermal margin-is required before substitution in production designs using AOD2816.