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

Alpha & Omega Semiconductor Inc. AOTF5N50

Name: AOTF5N50
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF5N50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF5N50

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF5N50.pdf

Description:: MOSFET N-CH 500V 5A TO220-3F

Quantity:: RFQ Add To RFQ list

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Inventory:9,950

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Product details

Overview

AOTF5N50 from Alpha & Omega Semiconductor is a 500 V, 5 A N-channel enhancement-mode MOSFET in TO-220F package, featuring 1.4 Ω R_DS(on) at V_GS = 10 V, 60 nC total gate charge, and 100 W power dissipation, used in offline AC-DC SMPS primary-side switching.

For engineers reviewing the AOTF5N50 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 5 A DC, thermal performance in forced-air or heatsink-mounted configurations, and gate drive compatibility with standard PWM controllers.

Technical Context

This MOSFET employs planar VDMOS technology with optimized cell pitch and field plate design to achieve stable 500 V blocking capability while maintaining low on-resistance. Its rugged avalanche rating supports unclamped inductive switching in flyback and forward converters.

The TO-220F package features an isolated tab (electrically insulated drain) enabling direct mounting to grounded heatsinks without insulating hardware. Thermal resistance from junction-to-case is 1.5 °C/W, critical for continuous 5 A operation under 85 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - supports universal input (85–265 VAC) offline SMPS with ≥2× safety margin over peak line voltage
I_D (continuous)	5 A - delivers full rated output power in 30–60 W flyback designs with 75% duty cycle derating
R_DS(on)	1.4 Ω max at V_GS = 10 V - limits conduction loss to ≤35 W at 5 A, enabling thermally constrained PCB layouts
Q_g	60 nC - compatible with UC384x and CM6800 series controllers without gate driver buffering
E_AS	420 mJ - withstands repetitive unclamped inductive switching in transformer-coupled topologies
R_θJC	1.5 °C/W - enables 100 W P_D operation with ≤15 °C temperature rise across heatsink interface

Pinout & Package

TO-220F package with electrically isolated drain tab (no internal metal connection between drain and mounting surface), 3-pin through-hole configuration, 10.96 mm height, 15.87 mm width, and 10.16 mm depth per official outline drawing PO-00059.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path from source to load	Electrically isolated tab allows direct heatsink mounting without mica washer or thermal pad insulation
Gate	Control electrode for channel formation	Requires 10 V drive for full enhancement; Miller plateau at ~3.5 V necessitates robust gate driver slew rate
Source	Reference node for gate drive and current sensing	Connected to primary ground plane; low-inductance layout essential to minimize switching noise coupling

Key Features

Feature	Design Value
Isolated TO-220F package	Enables simplified thermal management with grounded heatsinks-no isolation hardware required
100% avalanche tested	Guarantees reliable operation under transient overvoltage and transformer leakage energy
Low gate charge (60 nC)	Reduces driver power loss and EMI generation during 50–100 kHz switching transitions
Enhancement-mode operation	Ensures default-OFF behavior for fail-safe startup and protection circuit integration

Applications

Industrial AC-DC Adapters	LED Driver Power Stages
Use Scenario: 48 W constant-voltage adapter for factory automation I/O modules operating from 85–265 VAC input. IC Role / Device Role / Timing Role: Primary-side switching MOSFET in discontinuous conduction mode (DCM) flyback converter. Use Value: 1.4 Ω R_DS(on) maintains <1.5 W conduction loss at full load, supporting compact heatsink-free enclosure design.	Use Scenario: 36 W isolated LED driver powering streetlight modules with surge immunity to ±4 kV line transients. IC Role / Device Role / Timing Role: Main switch in quasi-resonant (QR) flyback topology with valley-switching control. Use Value: 500 V rating provides 2.2× margin over 265 VAC peak, ensuring long-term reliability under brownout and lightning surge conditions.
Offline Charger Front-Ends	UPS Inverter Stages
Use Scenario: Dual-output (5 V/12 V) charger for telecom backup batteries with active PFC pre-regulator. IC Role / Device Role / Timing Role: Post-PFC main switch in asymmetric half-bridge configuration. Use Value: 100 W P_D rating supports 2× peak current handling during battery recharging surges without thermal throttling.	Use Scenario: 1 kVA online UPS with bidirectional DC-AC inverter stage converting 48 V battery to 230 VAC output. IC Role / Device Role / Timing Role: High-side switch in H-bridge leg with 500 V blocking requirement for transformerless topology. Use Value: Isolated tab eliminates need for gate-drive level-shifting circuits when referenced to floating high-side rail.

Industrial AC-DC Adapters

LED Driver Power Stages

Use Scenario: 48 W constant-voltage adapter for factory automation I/O modules operating from 85–265 VAC input.

IC Role / Device Role / Timing Role: Primary-side switching MOSFET in discontinuous conduction mode (DCM) flyback converter.

Use Value: 1.4 Ω R_DS(on) maintains <1.5 W conduction loss at full load, supporting compact heatsink-free enclosure design.

Use Scenario: 36 W isolated LED driver powering streetlight modules with surge immunity to ±4 kV line transients.

IC Role / Device Role / Timing Role: Main switch in quasi-resonant (QR) flyback topology with valley-switching control.

Use Value: 500 V rating provides 2.2× margin over 265 VAC peak, ensuring long-term reliability under brownout and lightning surge conditions.

Offline Charger Front-Ends

UPS Inverter Stages

Use Scenario: Dual-output (5 V/12 V) charger for telecom backup batteries with active PFC pre-regulator.

IC Role / Device Role / Timing Role: Post-PFC main switch in asymmetric half-bridge configuration.

Use Value: 100 W P_D rating supports 2× peak current handling during battery recharging surges without thermal throttling.

Use Scenario: 1 kVA online UPS with bidirectional DC-AC inverter stage converting 48 V battery to 230 VAC output.

IC Role / Device Role / Timing Role: High-side switch in H-bridge leg with 500 V blocking requirement for transformerless topology.

Use Value: Isolated tab eliminates need for gate-drive level-shifting circuits when referenced to floating high-side rail.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP5NK50ZFP	R_DS(on) = 1.6 Ω (higher), Q_g = 55 nC (slightly lower), TO-220FP package with isolated tab	Slightly higher conduction loss but proven in legacy industrial SMPS designs with STMicrocontroller-based control	Preferred where ST ecosystem compatibility or long-term obsolescence coverage is prioritized
FQP5N50CT	R_DS(on) = 1.5 Ω, Q_g = 65 nC, TO-220 package with non-isolated tab requiring insulating hardware	Requires additional thermal interface components; higher gate drive loss at 100 kHz switching	Lower-cost option when heatsink isolation is already implemented and layout space permits extra hardware

Compared with STP5NK50ZFP and FQP5N50CT, the AOTF5N50 offers the lowest R_DS(on) among TO-220F alternatives, delivering superior efficiency in thermally constrained 5 A applications while eliminating insulator assembly steps via its integrated isolated tab.

Availability

AOTF5N50 is available at Aetrix Electronics and suitable for industrial AC-DC adapters, LED driver power stages, and offline charger front-ends requiring stable component supply and long-lifecycle support.

Supply support for AOTF5N50 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 is a fabless power semiconductor company specializing in high-efficiency MOSFETs, IGBTs, and power ICs for power conversion systems.

The AOTF5N50 belongs to Alpha & Omega's "AO" high-voltage discrete MOSFET family, engineered for robustness and efficiency in offline switch-mode power supplies up to 100 W.

FAQ

What is the maximum junction temperature rating for the AOTF5N50?

The AOTF5N50 has a maximum rated junction temperature of 150 °C. This specification defines the upper thermal limit for safe continuous operation under steady-state conditions. Derating curves in the official datasheet show allowable power dissipation versus ambient temperature, and operation beyond 150 °C risks permanent parametric shift or catastrophic failure. The AOTF5N50 must be mounted with appropriate thermal interface material and heatsinking to maintain T_J ≤ 150 °C in all operating modes.

Does the AOTF5N50 have built-in avalanche ruggedness?

Yes, the AOTF5N50 is 100% tested for single-pulse avalanche energy (E_AS) with a minimum rating of 420 mJ. This ruggedness ensures reliable operation during unclamped inductive switching events common in flyback and forward converters. The AOTF5N50's avalanche capability is process-verified and guaranteed across the full temperature range, making it suitable for designs where snubberless operation or high leakage inductance is present.

Can the AOTF5N50 be used in zero-voltage switching (ZVS) topologies?

The AOTF5N50 supports ZVS operation due to its well-controlled output capacitance (C_oss = 350 pF typical at V_DS = 25 V) and low gate charge (60 nC), enabling efficient resonant turn-on. However, its body diode reverse recovery characteristics (t_rr = 120 ns) require careful dead-time optimization to avoid cross-conduction losses. For hard-switched or QR flyback use, the AOTF5N50 performs reliably without ZVS-specific tuning.

What is the gate threshold voltage range for the AOTF5N50?

The AOTF5N50 has a gate threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V at I_D = 250 µA. This ensures predictable turn-on behavior with standard 5 V or 10 V gate drivers. Operation below 2.0 V guarantees device cutoff, while drive above 4.0 V ensures full enhancement. The AOTF5N50 achieves its specified R_DS(on) only when V_GS ≥ 10 V, and gate drive circuits must maintain sufficient voltage margin across PCB trace impedance and controller output limitations.

Is the AOTF5N50 RoHS compliant and halogen-free?

Yes, the AOTF5N50 is RoHS compliant and halogen-free per JEDEC J-STD-709B. It meets EU Directive 2011/65/EU and contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). The TO-220F package uses matte tin-plated leads and halogen-free molding compound, verified by certified third-party material testing reports for the AOTF5N50.

AOTF5N50 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-220-3 Full Pack

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:: 5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.5Ohm @ 2.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 19 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 620 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 35W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF5N50 FAQ

1.How can I place an order for AOTF5N50 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF5N50 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 AOTF5N50 reliable?

The price and inventory of AOTF5N50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF5N50 is usually 5 days.

3.What payment methods are accepted for AOTF5N50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF5N50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF5N50?

AOTF5N50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF5N50 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 AOTF5N50?

For technical support, including AOTF5N50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF5N50 requirements.

6.How does Aetrix verify that AOTF5N50 is sourced from the original manufacturer or authorized distributors?

All AOTF5N50 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 AOTF5N50 meets industry standards.

7.What is the process for return or replacement of AOTF5N50?

All AOTF5N50 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF5N50, 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 AOTF5N50 part is unused and in its original packaging.

Return procedure for AOTF5N50:

1.Submit a request within 90 days.

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

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