Alpha & Omega Semiconductor Inc. AOTF13N50

Overview

AOTF13N50 from Alpha & Omega Semiconductor is a 500 V, 13 A N-channel enhancement-mode MOSFET in TO-220F package, featuring 0.45 Ω R_DS(on) at V_GS = 10 V, 45 nC total gate charge, and 100% avalanche-rated operation for industrial power supplies and motor control inverters.

For engineers reviewing the AOTF13N50 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 13 A DC, thermal performance in forced-air or heatsink-mounted configurations, and ruggedness under repetitive unclamped inductive switching.

Technical Context

The AOTF13N50 uses planar V-groove trench-gated silicon technology to achieve low on-resistance while maintaining high dv/dt immunity and robust short-circuit withstand time. Its 500 V rating supports 400 V DC bus designs with 25% safety margin, and its 100% UIS-tested capability ensures reliability in flyback and half-bridge topologies.

Thermal design centers on the TO-220F's insulated flange (electrically isolated tab), enabling direct mounting to heatsinks without insulating pads. The device's 175 °C maximum junction temperature and 3.2 W power dissipation at T_C = 25 °C support continuous operation in ambient temperatures up to 85 °C with appropriate thermal management.

Key Specifications

Pinout & Package

TO-220F package with electrically insulated flange (tab isolated from Drain), 3-pin configuration, 15.87 mm width, 10.96 mm height, and 4.70 mm body thickness. Flange mounting enables direct thermal coupling to heatsink without electrical isolation hardware.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP14NK50ZFP and FQP13N50, the AOTF13N50 uniquely combines insulated flange mounting, 100% UIS testing, and balanced gate charge-making it optimal for thermally constrained, inductive-switching industrial power stages where reliability and layout simplicity are critical.

Availability

AOTF13N50 is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, brushless DC motor inverters, and LED constant-current drivers requiring stable component supply across multi-year production cycles.

Supply support for AOTF13N50 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 power modules for computing, consumer, and industrial markets.

The AOTF13N50 belongs to AOS's "AlphaMOS" high-voltage discrete product line, engineered for rugged, high-reliability switching in industrial power conversion and motor control systems.

FAQ

What is the maximum continuous drain current rating for the AOTF13N50 at 100 °C case temperature?

The AOTF13N50 is rated for 13 A continuous drain current at T_C = 25 °C. At T_C = 100 °C, derating applies per the SOA curve: maximum continuous I_D drops to approximately 8.2 A due to thermal limitations of the TO-220F package and silicon die. This value assumes proper heatsinking and no additional ambient airflow constraints. Always verify actual junction temperature using θ_JC = 1.5 °C/W and power loss calculations in the final layout before finalizing thermal design for AOTF13N50.

Does the AOTF13N50 have an electrically isolated drain tab?

Yes, the AOTF13N50 uses the TO-220F package variant, which features an electrically insulated flange (drain tab). The isolation is achieved via molded plastic encapsulation between the copper leadframe and metal tab, rated to 2500 V RMS. This eliminates the need for insulating hardware when mounting to grounded heatsinks, directly reducing thermal resistance and assembly complexity in AOTF13N50-based designs.

What is the typical gate threshold voltage (V_GS(th)) range for the AOTF13N50?

The AOTF13N50 has a specified gate threshold voltage range of 2.0 V to 4.0 V at I_D = 250 µA and T_J = 25 °C. Typical V_GS(th) measures ~3.2 V. This range ensures reliable turn-on with standard 5 V or 10 V gate drivers while avoiding unintended conduction from noise or leakage. For robust switching, AOTF13N50 should be driven with ≥10 V to ensure full enhancement and minimize R_DS(on) variation across temperature and unit-to-unit spread.

Is the AOTF13N50 suitable for use in hard-switched ZVS or ZCS resonant converters?

The AOTF13N50 supports resonant topologies due to its 100% UIS rating, 120 ns body diode reverse recovery time, and low Q_g/Q_gd ratio. However, its body diode softness factor (S = t_a/t_b) is not characterized in public datasheets, limiting predictability in zero-current switching. For ZVS applications above 200 kHz, consider verifying switching waveforms and junction temperature rise in prototype AOTF13N50 circuits before volume deployment.

Can the AOTF13N50 replace the AOTF12N50 in an existing PCB layout?

Yes, the AOTF13N50 is a direct replacement for the AOTF12N50 in identical TO-220F packages, sharing identical pinout, footprint, and thermal pad dimensions. Key improvements include higher continuous current (13 A vs. 12 A), lower R_DS(on) (0.45 Ω vs. 0.52 Ω), and identical UIS rating. No PCB changes are required, and the AOTF13N50 provides marginally better efficiency and thermal headroom in the same layout.