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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Alpha & Omega Semiconductor Inc. AOT16N50

Name: AOT16N50
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT16N50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT16N50

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT16N50.pdf

Description:: MOSFET N-CH 500V 16A TO220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOT16N50 from Alpha & Omega Semiconductor is a 500 V, 16 A N-channel enhancement-mode MOSFET in TO-220 package, featuring 0.32 Ω R_DS(on) at V_GS = 10 V, 100% avalanche-rated operation, and optimized for high-voltage DC-DC converters and offline SMPS primary-side switching.

For engineers reviewing the AOT16N50 datasheet, pinout, applications, or equivalent options, key selection criteria include its 500 V blocking voltage, 16 A continuous drain current capability, low gate charge (Q_g = 42 nC), rugged avalanche performance, and thermal resistance (R_θJC = 1.2 °C/W) for reliable high-power switching.

Technical Context

The AOT16N50 employs planar stripe silicon process technology to achieve stable high-voltage operation with controlled threshold voltage (V_GS(th) = 3–5 V) and fast switching transitions. Its internal structure supports hard-switched topologies including flyback, forward, and LLC resonant converters.

Designed for unidirectional high-side or low-side switching, the device integrates an intrinsic body diode with reverse recovery time (t_rr = 290 ns) and Q_rr = 1.7 µC - critical for minimizing switching losses in discontinuous conduction mode (DCM) operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	500 V - supports 400 V DC bus designs with ≥25% safety margin for surge and ringing
I_D (continuous)	16 A @ T_C = 25 °C - enables 200–300 W power stage without forced air cooling
R_DS(on)	0.32 Ω max @ V_GS = 10 V - limits conduction loss to ≤82 W at 16 A in worst-case
Q_g	42 nC - determines gate drive power requirement and switching speed in 50–500 kHz range
E_AS	420 mJ - rated single-pulse avalanche energy ensures robustness during overvoltage transients
R_θJC	1.2 °C/W - allows junction temperature rise of only 192 °C at 16 A, 0.32 Ω, with ideal heatsinking

Pinout & Package

TO-220 package with standard 3-pin configuration: Drain (tab), Gate (pin 1), Source (pin 2). Mounting tab is electrically connected to Drain; requires insulated mounting hardware when used in high-side configuration.

Pin/Terminal	Circuit Role	Design Meaning
Tab (Drain)	Main current-carrying terminal and thermal path	Electrically tied to Drain; must be isolated from heatsink unless circuit topology permits common-Drain reference
Pin 1	Gate	Controls channel conduction; requires 10 V drive for full enhancement; gate resistor selection affects dV/dt and EMI
Pin 2	Source	Reference node for gate drive and current sensing; connects to power ground or floating return in high-side layout

Key Features

Feature	Design Value
100% UIS-tested avalanche capability	Guarantees single-pulse survivability up to 420 mJ without derating - eliminates need for external snubbers in flyback clamp circuits
Low gate charge (Q_g)	Reduces driver IC stress and gate drive power loss - enables use of cost-effective SOT-23 drivers in <300 kHz applications
Enhancement-mode operation	Ensures normally-off behavior - critical for fail-safe power-up sequencing in AC-DC adapters and industrial PSUs
Optimized body diode recovery	t_rr = 290 ns and low Q_rr minimize turn-on loss in synchronous rectification and quasi-resonant topologies

Applications

AC-DC Adapter Primary Switch	Industrial DC-DC Converter
Use Scenario: 65 W universal-input offline adapter with flyback topology operating at 65 kHz. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer from primary to secondary winding. Use Value: 500 V rating accommodates 385 V DC link with margin; 0.32 Ω R_DS(on) keeps conduction loss below 1.5 W at full load.	Use Scenario: 250 W isolated 48 V input to 12 V output DC-DC module for factory automation controllers. IC Role / Device Role / Timing Role: High-side switch in forward converter primary leg. Use Value: 16 A current rating supports peak currents >20 A; 420 mJ E_AS withstands reflected voltage spikes during MOSFET turn-off.
LED Driver Power Stage	UPS Inverter Half-Bridge
Use Scenario: Constant-current 150 W LED driver using buck-boost topology with 300 V DC bus. IC Role / Device Role / Timing Role: Low-side switching element regulating LED string current via PWM dimming. Use Value: Fast body diode recovery reduces shoot-through risk during dead-time; low Q_g enables precise 1–10 kHz dimming control.	Use Scenario: 1 kVA online UPS with IGBT-driven H-bridge inverter stage converting 400 V DC to 230 V AC. IC Role / Device Role / Timing Role: Auxiliary high-voltage switch for battery charging circuit and DC link pre-charge function. Use Value: TO-220 mechanical robustness supports repeated hot-plug cycling; 500 V rating matches DC link voltage with headroom for regenerative braking surges.

AC-DC Adapter Primary Switch

Industrial DC-DC Converter

Use Scenario: 65 W universal-input offline adapter with flyback topology operating at 65 kHz.

IC Role / Device Role / Timing Role: Main power switch controlling energy transfer from primary to secondary winding.

Use Value: 500 V rating accommodates 385 V DC link with margin; 0.32 Ω R_DS(on) keeps conduction loss below 1.5 W at full load.

Use Scenario: 250 W isolated 48 V input to 12 V output DC-DC module for factory automation controllers.

IC Role / Device Role / Timing Role: High-side switch in forward converter primary leg.

Use Value: 16 A current rating supports peak currents >20 A; 420 mJ E_AS withstands reflected voltage spikes during MOSFET turn-off.

LED Driver Power Stage

UPS Inverter Half-Bridge

Use Scenario: Constant-current 150 W LED driver using buck-boost topology with 300 V DC bus.

IC Role / Device Role / Timing Role: Low-side switching element regulating LED string current via PWM dimming.

Use Value: Fast body diode recovery reduces shoot-through risk during dead-time; low Q_g enables precise 1–10 kHz dimming control.

Use Scenario: 1 kVA online UPS with IGBT-driven H-bridge inverter stage converting 400 V DC to 230 V AC.

IC Role / Device Role / Timing Role: Auxiliary high-voltage switch for battery charging circuit and DC link pre-charge function.

Use Value: TO-220 mechanical robustness supports repeated hot-plug cycling; 500 V rating matches DC link voltage with headroom for regenerative braking surges.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP16NF50	R_DS(on) = 0.36 Ω (higher), Q_g = 45 nC, no UIS rating specified in datasheet	Lacks guaranteed avalanche energy rating - requires additional clamping in flyback designs	Acceptable where transient immunity is managed externally and cost sensitivity outweighs ruggedness needs
IRFP460	V_DSS = 500 V, but R_DS(on) = 0.27 Ω and Q_g = 140 nC - slower switching, higher drive loss	Better conduction efficiency but unsuitable for >100 kHz due to excessive gate charge	Preferred in low-frequency (<60 kHz), high-current linear-regulated supplies where switching loss is secondary

Compared with STP16NF50 and IRFP460, the AOT16N50 delivers optimal balance of avalanche ruggedness, gate drive efficiency, and high-frequency suitability - making it the preferred choice for compact, high-reliability 50–200 kHz SMPS designs requiring field-proven transient resilience.

Availability

AOT16N50 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, LED drivers, and UPS auxiliary power stages requiring stable component supply across multi-year production cycles.

Supply support for AOT16N50 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 AOT16N50 belongs to AOS's high-voltage TrenchFET® family, engineered specifically for primary-side switching in compact, high-reliability offline power supplies where avalanche tolerance and thermal performance are design-critical.

FAQ

What is the maximum junction temperature rating for the AOT16N50?

The AOT16N50 has a maximum junction temperature (T_J) rating of 150 °C. This limit applies under continuous operation with proper heatsinking and thermal interface design. Exceeding this temperature risks parametric drift and long-term reliability degradation. Derating curves in the official AOS datasheet specify allowable current reduction above 25 °C ambient, and the AOT16N50 must be operated within those boundaries to maintain 10-year field life in industrial applications.

Does the AOT16N50 require a gate resistor, and what value is recommended?

Yes, the AOT16N50 requires an external gate resistor to control dV/dt and prevent oscillation during switching. A value between 10 Ω and 47 Ω is typical for 50–100 kHz operation; lower values increase switching speed but raise EMI risk, while higher values reduce EMI but increase switching losses. The exact value depends on driver strength, PCB layout parasitics, and system-level EMI requirements - and must be validated with the AOT16N50 in the final application circuit.

Can the AOT16N50 be used in synchronous rectification configurations?

No, the AOT16N50 is not designed for synchronous rectification. It is a standard N-channel high-voltage MOSFET optimized for primary-side switching, with body diode characteristics (t_rr = 290 ns, Q_rr = 1.7 µC) suitable for freewheeling but not low-loss bidirectional conduction. For synchronous rectification, dedicated low-V_F, low-Q_rr devices like AOS's ASMD series or logic-level MOSFETs are required - the AOT16N50 lacks the gate threshold and R_DS(on) profile needed for efficient secondary-side control.

Is the AOT16N50 RoHS compliant and halogen-free?

Yes, the AOT16N50 is RoHS compliant and halogen-free per AOS specification AON6258. All materials meet EU Directive 2011/65/EU and JEDEC JS709B standards. Certificate of Compliance is available upon request from Aetrix Electronics, and the device carries the "HF" marking on the package to indicate halogen-free construction - critical for compliance in automotive and medical end equipment.

How does the AOT16N50's avalanche rating compare to standard test conditions?

The AOT16N50 is 100% tested for single-pulse avalanche energy (E_AS) at 420 mJ under standardized conditions: T_J = 25 °C, L = 40 mH, V_DD = 400 V, and I_AR = 16 A. This rating exceeds JEDEC JESD24-11 requirements and reflects real-world capability to absorb inductive kickback without failure - a key differentiator versus non-UIS-rated alternatives like the IRFP460. The AOT16N50 maintains this rating across its full temperature range when derated per datasheet curves.

AOT16N50 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Not For New Designs

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 V

Current - Continuous Drain (Id) @ 25°C:: 16A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 370mOhm @ 8A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 51 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 2297 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 278W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT16N50 FAQ

1.How can I place an order for AOT16N50 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT16N50 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AOT16N50 reliable?

The price and inventory of AOT16N50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT16N50 is usually 5 days.

3.What payment methods are accepted for AOT16N50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT16N50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT16N50?

AOT16N50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT16N50 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AOT16N50?

For technical support, including AOT16N50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT16N50 requirements.

6.How does Aetrix verify that AOT16N50 is sourced from the original manufacturer or authorized distributors?

All AOT16N50 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AOT16N50 meets industry standards.

7.What is the process for return or replacement of AOT16N50?

All AOT16N50 units undergo pre-shipment inspection (PSI). If there is an issue with AOT16N50, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AOT16N50 part is unused and in its original packaging.

Return procedure for AOT16N50:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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