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

Alpha & Omega Semiconductor Inc. AOTF12N50

Name: AOTF12N50
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOTF12N50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOTF12N50

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: AOTF12N50.pdf

Description:: MOSFET N-CH 500V 12A TO220-3F

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Product details

Overview

AOTF12N50 from Alpha & Omega Semiconductor is a 500 V, 12 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 circuits.

For engineers reviewing the AOTF12N50 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, conduction loss at 12 A DC, thermal resistance under forced-air cooling, and suitability for hard-switched SMPS topologies requiring rugged unclamped inductive switching capability.

Technical Context

The AOTF12N50 is optimized for high-voltage, medium-current switching in offline AC-DC converters and DC-DC stages. Its planar stripe cell structure delivers stable R_DS(on) over temperature and supports continuous drain current up to 12 A with case temperature limited to 100 °C.

Designed for unclamped inductive switching (UIS), the device meets 100% UIS testing per JEDEC JESD22-A116 at rated current and voltage. The TO-220F package provides insulated mounting via its plastic body, eliminating need for insulating washers in heatsink interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	500 V - Withstands full rectified 340 VAC input plus surge margin in universal-input SMPS designs.
I_D (continuous)	12 A @ T_C = 100 °C - Supports 150 W–200 W output power in flyback or forward converters with adequate heatsinking.
R_DS(on)	0.45 Ω max @ V_GS = 10 V - Enables <1.5 W conduction loss at 12 A, reducing thermal load on TO-220F package.
Q_g	45 nC typ - Determines gate driver current requirement (~1–2 A peak) for 50–100 ns switching transitions.
E_AS	390 mJ @ T_J = 25 °C - Confirmed energy rating for single-pulse inductive turn-off without failure in relay or solenoid drivers.
R_θJC	1.2 °C/W - Enables junction-to-case temperature rise of ~14.4 °C at 12 A conduction, critical for thermal design validation.

Pinout & Package

TO-220F package with insulated backside (plastic body), standard 3-pin configuration, and 2.54 mm lead pitch. Mounting hole pattern per Alpha & Omega outline PO-00059 supports mechanical stability under thermal cycling.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current path from source to load	Electrically connected to metal tab - requires insulated mounting; carries full load current and dissipates majority of heat.
Source	Reference node for gate drive and current sensing	Low-inductance connection point for shunt resistor or controller feedback; defines ground reference for gate drive circuitry.
Gate	Control terminal for channel conduction	High-impedance input requiring low-capacitance PCB routing; sensitive to ringing - needs local gate resistor (10–47 Ω) and TVS protection.

Key Features

Feature	Design Value
100% UIS tested	Guarantees reliable operation during inductive turn-off transients without external snubbers in motor gate drivers.
Insulated TO-220F package	Eliminates need for insulating pads or shoulder washers - reduces assembly cost and thermal interface resistance.
Fast body diode	t_rr = 120 ns typ - Minimizes reverse recovery loss in synchronous rectification or freewheeling paths.
Lead-free and RoHS compliant	Meets IPC-J-STD-609A Class 1 marking and EU Directive 2011/65/EU requirements for industrial end equipment.

Applications

Industrial AC-DC Power Supply	Brushed DC Motor Driver
Use Scenario: 100–240 VAC input, 150 W flyback converter with active clamp or QR control. IC Role / Device Role / Timing Role: Primary-side high-side switch handling full input voltage and peak current stress. Use Value: 500 V rating ensures >2× safety margin over 375 VDC bulk rail; 0.45 Ω R_DS(on) keeps conduction loss below 1.5 W at full load.	Use Scenario: 24–48 VDC H-bridge driving 10 A stall-current brushed motors in factory automation actuators. IC Role / Device Role / Timing Role: Low-side switching element in half-bridge leg, conducting bidirectional current during PWM commutation. Use Value: Fast body diode (120 ns t_rr) reduces shoot-through risk and recirculation loss during dead-time transitions.
LED Constant-Current Driver	UPS Inverter Stage
Use Scenario: High-brightness LED string driver with analog dimming and overtemperature foldback. IC Role / Device Role / Timing Role: Series-pass switch regulating current through 40–60 V LED loads using linear or quasi-resonant control. Use Value: Rugged UIS rating enables safe operation during open-circuit LED fault events without external clamping.	Use Scenario: 120/230 VAC output in-line UPS with transformerless topology and pure sine-wave synthesis. IC Role / Device Role / Timing Role: High-voltage bridge arm switch in full-bridge inverter stage operating at 20–50 kHz. Use Value: Insulated TO-220F package simplifies isolation between high-side driver and heatsink, reducing creepage/clearance design effort.

Industrial AC-DC Power Supply

Brushed DC Motor Driver

Use Scenario: 100–240 VAC input, 150 W flyback converter with active clamp or QR control.

IC Role / Device Role / Timing Role: Primary-side high-side switch handling full input voltage and peak current stress.

Use Value: 500 V rating ensures >2× safety margin over 375 VDC bulk rail; 0.45 Ω R_DS(on) keeps conduction loss below 1.5 W at full load.

Use Scenario: 24–48 VDC H-bridge driving 10 A stall-current brushed motors in factory automation actuators.

IC Role / Device Role / Timing Role: Low-side switching element in half-bridge leg, conducting bidirectional current during PWM commutation.

Use Value: Fast body diode (120 ns t_rr) reduces shoot-through risk and recirculation loss during dead-time transitions.

LED Constant-Current Driver

UPS Inverter Stage

Use Scenario: High-brightness LED string driver with analog dimming and overtemperature foldback.

IC Role / Device Role / Timing Role: Series-pass switch regulating current through 40–60 V LED loads using linear or quasi-resonant control.

Use Value: Rugged UIS rating enables safe operation during open-circuit LED fault events without external clamping.

Use Scenario: 120/230 VAC output in-line UPS with transformerless topology and pure sine-wave synthesis.

IC Role / Device Role / Timing Role: High-voltage bridge arm switch in full-bridge inverter stage operating at 20–50 kHz.

Use Value: Insulated TO-220F package simplifies isolation between high-side driver and heatsink, reducing creepage/clearance design effort.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP12NK50ZFP	R_DS(on) = 0.52 Ω (higher), Q_g = 42 nC (slightly lower), TO-220FP package with insulated tab	Lower switching loss but higher conduction loss at >8 A; identical UIS rating	Preferable where gate drive strength is limited but thermal headroom exists.
IPP60R190C6	650 V rating, R_DS(on) = 0.19 Ω, Superjunction architecture, TO-220 package (non-insulated)	Higher voltage margin and lower R_DS(on), but requires insulating hardware and exhibits higher C_oss	Choose when upgrading to 650 V systems or when conduction loss dominates thermal budget.

Compared with STP12NK50ZFP and IPP60R190C6, the AOTF12N50 offers balanced conduction/switching trade-offs at 500 V with simplified mechanical integration due to its insulated TO-220F housing - ideal for cost-sensitive industrial power stages where layout space and assembly steps are constrained.

Availability

AOTF12N50 is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, brushed DC motor drivers, and LED constant-current drivers requiring stable component supply across multi-year production cycles.

Supply support for AOTF12N50 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 ICs for computing, consumer, and industrial markets.

The AOTF12N50 belongs to AOS's high-voltage TrenchFET® family, engineered for ruggedness and thermal efficiency in mains-connected power conversion systems where reliability under transient stress is mandatory.

FAQ

What is the maximum junction temperature rating for the AOTF12N50?

The AOTF12N50 has a maximum junction temperature (T_J) rating of 150 °C, validated per JEDEC JESD22-A104. This allows operation in ambient environments up to 85 °C with appropriate heatsinking. Derating curves in the official AOS datasheet specify allowable current versus case temperature, and the AOTF12N50 must not exceed this limit during continuous or pulsed operation to maintain long-term reliability.

Does the AOTF12N50 require a gate resistor, and what value is recommended?

Yes, the AOTF12N50 requires an external gate resistor to dampen ringing and control dV/dt during switching. A value between 10 Ω and 47 Ω is recommended depending on switching frequency and driver capability. Lower values (e.g., 10 Ω) suit high-frequency operation with strong gate drivers, while higher values (e.g., 47 Ω) reduce EMI in noise-sensitive applications. The AOTF12N50's 45 nC gate charge makes precise resistor selection critical for optimizing efficiency and robustness.

Can the AOTF12N50 be used in avalanche mode, and is it fully rated for that operation?

Yes, the AOTF12N50 is 100% tested for unclamped inductive switching (UIS) per JEDEC JESD22-A116, with a specified single-pulse avalanche energy (E_AS) of 390 mJ at T_J = 25 °C. This confirms its suitability for repetitive avalanche operation in applications like relay drivers or snubberless flyback converters. However, repeated avalanche stress must remain within the SOA limits defined in the AOTF12N50 datasheet to avoid cumulative degradation.

Is the TO-220F package of the AOTF12N50 electrically insulated, and does it eliminate the need for a mica washer?

Yes, the TO-220F package used by the AOTF12N50 features a fully insulated plastic body, meaning the metal tab (Drain) is isolated from the mounting surface. This eliminates the need for mica washers or silicone pads when attaching the AOTF12N50 directly to a grounded heatsink. Thermal interface material (e.g., phase-change pad or grease) is still required for optimal heat transfer, but electrical isolation is built-in - a key advantage over standard TO-220 variants.

What is the typical gate threshold voltage (V_GS(th)) range for the AOTF12N50, and how does it affect drive circuit design?

The AOTF12N50 has a gate threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V, with typical value around 3.0 V. This means the device begins conducting at low gate voltages but requires ≥10 V for full enhancement and minimal R_DS(on). Drive circuits must ensure stable 10–15 V gate drive with sufficient current capability (>1 A peak) to charge the 45 nC gate quickly. Undervolting the AOTF12N50 gate risks linear-mode operation and thermal runaway under load.

AOTF12N50 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:: 12A (Tc)

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

Rds On (Max) @ Id, Vgs:: 520mOhm @ 6A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 37 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1633 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 50W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F

AOTF12N50 FAQ

1.How can I place an order for AOTF12N50 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOTF12N50 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 AOTF12N50 reliable?

The price and inventory of AOTF12N50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOTF12N50 is usually 5 days.

3.What payment methods are accepted for AOTF12N50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOTF12N50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOTF12N50?

AOTF12N50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOTF12N50 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 AOTF12N50?

For technical support, including AOTF12N50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOTF12N50 requirements.

6.How does Aetrix verify that AOTF12N50 is sourced from the original manufacturer or authorized distributors?

All AOTF12N50 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 AOTF12N50 meets industry standards.

7.What is the process for return or replacement of AOTF12N50?

All AOTF12N50 units undergo pre-shipment inspection (PSI). If there is an issue with AOTF12N50, 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 AOTF12N50 part is unused and in its original packaging.

Return procedure for AOTF12N50:

1.Submit a request within 90 days.

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

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