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

Alpha & Omega Semiconductor Inc. AOT20N25L

Name: AOT20N25L
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOT20N25L
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOT20N25L

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: AOT20N25L.pdf

Description:: MOSFET N-CH 250V 20A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:4,034

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Product details

Overview

AOT20N25L from Alpha & Omega Semiconductor is a 250 V, 20 A, 0.18 Ω (max) R_DS(on) N-channel enhancement-mode MOSFET in TO-220 package, designed for high-efficiency switching power supplies, DC-DC converters, and motor control circuits.

For engineers reviewing the AOT20N25L datasheet, pinout, applications, or equivalent options, key selection criteria include its 250 V V_DS, 20 A I_D continuous rating, low gate charge (Q_g = 42 nC), fast turn-on/turn-off times, and thermal performance in standard through-hole mounting.

Technical Context

The AOT20N25L employs a planar trench-gate process to achieve low on-resistance with robust avalanche capability. It features a 100% EAS-tested ruggedness rating and operates with gate threshold voltage (V_GS(th)) between 2.0 V and 4.0 V at 250 µA drain current.

Its SOA curve supports repetitive pulse operation up to 10 ms at 25 °C case temperature, and it meets JEDEC JESD47 reliability standards for high-voltage power switching applications requiring stable conduction under transient overloads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	250 V - Maximum drain-source blocking voltage for use in 200 V-class DC bus systems
I_D (continuous)	20 A @ T_C = 25 °C - Sustained current handling with heatsink; derates to 12 A at 100 °C
R_DS(on) (max)	0.18 Ω @ V_GS = 10 V - Enables <1.8 W conduction loss at 10 A, reducing thermal load
Q_g	42 nC - Low gate drive energy requirement, compatible with standard PWM controllers
E_AS	390 mJ - Fully rated unclamped inductive switching capability without external snubbers
t_rr	55 ns - Fast body diode recovery minimizes switching losses in synchronous rectification

Pinout & Package

TO-220AB package with isolated tab (drain-connected), standard 3-lead through-hole mounting. Tab is electrically connected to drain terminal; mounting screw must be insulated unless drain is chassis-ground referenced.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main current-carrying output terminal	Electrically tied to metal tab; requires thermal interface and electrical isolation per layout
Gate	Control input for channel conduction	Threshold-triggered MOSFET gate; requires ≤±20 V drive, low-impedance source
Source	Reference node for gate drive and current return	Common return path for load current; defines local ground reference for gate drive circuitry

Key Features

Feature	Design Value
100% EAS tested	Guarantees reliable unclamped inductive switching without external protection components
Low Q_g/R_DS(on) ratio	Optimizes trade-off between switching speed and conduction loss in hard-switched topologies
Fast body diode (t_rr = 55 ns)	Reduces reverse recovery loss and EMI in freewheeling paths of buck or half-bridge converters
RoHS-compliant, lead-free	Meets industrial and automotive environmental compliance requirements without exemption waivers

Applications

AC-DC SMPS Primary Switch	DC-DC Buck Converter High-Side Switch
Use Scenario: 200–240 VAC offline flyback or forward converter primary-side switch operating at 65–130 kHz. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer from line to transformer primary winding. Use Value: 250 V V_DS margin enables safe operation across universal input range with surge tolerance; 0.18 Ω R_DS(on) limits conduction loss below 1.8 W at full load.	Use Scenario: 12 V–48 V input, 3.3–12 V output non-isolated buck regulator delivering up to 15 A. IC Role / Device Role / Timing Role: High-side synchronous rectifier switch driven by integrated or external gate driver. Use Value: Fast 55 ns t_rr and low Q_g reduce dead-time losses and improve light-load efficiency versus standard silicon MOSFETs.
Brushed DC Motor Driver	Industrial LED Driver Switch
Use Scenario: H-bridge or half-bridge control of 24–48 V brushed motors in automation actuators or power tools. IC Role / Device Role / Timing Role: Low-side or high-side switching element enabling PWM-based speed/torque control. Use Value: 20 A I_D rating supports peak stall currents; 390 mJ E_AS withstands inductive kickback during rapid direction reversal.	Use Scenario: Constant-current LED string driver for commercial lighting with 36–72 V output bus. IC Role / Device Role / Timing Role: Series-pass switch regulating current through high-brightness LED arrays. Use Value: Low R_DS(on) minimizes voltage drop across switch, preserving headroom for LED forward voltage and improving thermal margin.

AC-DC SMPS Primary Switch

DC-DC Buck Converter High-Side Switch

Use Scenario: 200–240 VAC offline flyback or forward converter primary-side switch operating at 65–130 kHz.

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

Use Value: 250 V V_DS margin enables safe operation across universal input range with surge tolerance; 0.18 Ω R_DS(on) limits conduction loss below 1.8 W at full load.

Use Scenario: 12 V–48 V input, 3.3–12 V output non-isolated buck regulator delivering up to 15 A.

IC Role / Device Role / Timing Role: High-side synchronous rectifier switch driven by integrated or external gate driver.

Use Value: Fast 55 ns t_rr and low Q_g reduce dead-time losses and improve light-load efficiency versus standard silicon MOSFETs.

Brushed DC Motor Driver

Industrial LED Driver Switch

Use Scenario: H-bridge or half-bridge control of 24–48 V brushed motors in automation actuators or power tools.

IC Role / Device Role / Timing Role: Low-side or high-side switching element enabling PWM-based speed/torque control.

Use Value: 20 A I_D rating supports peak stall currents; 390 mJ E_AS withstands inductive kickback during rapid direction reversal.

Use Scenario: Constant-current LED string driver for commercial lighting with 36–72 V output bus.

IC Role / Device Role / Timing Role: Series-pass switch regulating current through high-brightness LED arrays.

Use Value: Low R_DS(on) minimizes voltage drop across switch, preserving headroom for LED forward voltage and improving thermal margin.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP20NM25	R_DS(on) = 0.22 Ω (max), Q_g = 48 nC, same TO-220 package	Slightly higher conduction loss and gate drive demand; lower E_AS (280 mJ)	Acceptable where 250 V rating and 20 A current are required but tighter thermal budget allows minor efficiency trade-off
IRFP260N	V_DS = 200 V, R_DS(on) = 0.04 Ω, Q_g = 143 nC, TO-247 package	Lower voltage rating limits use to ≤170 V DC bus; higher gate charge increases driver complexity	Preferred only when ultra-low R_DS(on) dominates over voltage margin and board space constraints

Compared with STP20NM25 and IRFP260N, the AOT20N25L delivers optimal balance of 250 V rating, 0.18 Ω on-resistance, and 42 nC gate charge in compact TO-220 - making it suitable for space-constrained, universal-input power designs where both voltage margin and thermal efficiency matter.

Availability

AOT20N25L is available at Aetrix Electronics and suitable for AC-DC power supplies, DC-DC converters, and motor control systems requiring stable component supply and long-term industrial availability.

Supply support for AOT20N25L 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 automotive markets.

The AOT20N25L belongs to AOS's high-voltage TrenchFET® Gen IV family, engineered specifically for efficient, reliable switching in universal-input offline power conversion and industrial motor drives.

FAQ

What is the maximum junction temperature rating for the AOT20N25L?

The AOT20N25L has a maximum rated junction temperature (T_J) of 150 °C. This rating is specified in the official Alpha & Omega Semiconductor datasheet and applies under continuous operation with appropriate heatsinking. Derating curves are provided for ambient temperatures above 25 °C. The AOT20N25L must be operated within this limit to ensure long-term reliability and maintain its 100% EAS test guarantee.

Is the AOT20N25L pin-compatible with other TO-220 N-channel MOSFETs?

The AOT20N25L uses standard TO-220AB pinout (Drain–Gate–Source, left-to-right with tab facing outward), matching industry convention. However, pin compatibility alone does not guarantee functional equivalence - parameters like V_DS, R_DS(on), and Q_g differ across parts. Always verify layout clearance, thermal pad isolation, and drive requirements before substituting the AOT20N25L in an existing design.

Does the AOT20N25L have built-in gate protection?

The AOT20N25L does not integrate gate Zener clamping or series resistance. Its gate oxide is rated for ±20 V maximum V_GS; exceeding this risks permanent damage. External gate protection - such as a 12–15 V Zener clamp or RC snubber - is recommended in noisy environments or when driving with high-impedance sources. This design choice preserves low Q_g and fast switching, consistent with the AOT20N25L's target use in well-controlled power stages.

Can the AOT20N25L be used in avalanche mode continuously?

No - the AOT20N25L is rated for single-pulse and repetitive unclamped inductive switching (E_AS = 390 mJ), but not for continuous avalanche operation. Its 100% EAS test ensures robustness during transient inductive turn-off events, such as in motor commutation or relay de-energization. Sustained avalanche conduction will exceed thermal limits and cause failure. Proper snubber design or clamping remains essential for repetitive high-energy transients.

What is the typical gate threshold voltage range for the AOT20N25L?

The AOT20N25L has a gate threshold voltage (V_GS(th)) range of 2.0 V to 4.0 V, measured at I_D = 250 µA and T_J = 25 °C. This range ensures reliable turn-on with standard 5 V or 10 V logic-level gate drivers while maintaining sufficient noise margin against false triggering. The AOT20N25L achieves full enhancement (I_D ≥ 20 A) at V_GS = 10 V, as confirmed in its published transfer characteristics.

AOT20N25L 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):: 250 V

Current - Continuous Drain (Id) @ 25°C:: 20A (Tc)

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

Rds On (Max) @ Id, Vgs:: 170mOhm @ 10A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 25 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1028 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 208W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

AOT20N25L FAQ

1.How can I place an order for AOT20N25L through Aetrix?

Please submit a Request for Quotation (RFQ) for AOT20N25L 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 AOT20N25L reliable?

The price and inventory of AOT20N25L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOT20N25L is usually 5 days.

3.What payment methods are accepted for AOT20N25L?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOT20N25L transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOT20N25L?

AOT20N25L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOT20N25L 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 AOT20N25L?

For technical support, including AOT20N25L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOT20N25L requirements.

6.How does Aetrix verify that AOT20N25L is sourced from the original manufacturer or authorized distributors?

All AOT20N25L 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 AOT20N25L meets industry standards.

7.What is the process for return or replacement of AOT20N25L?

All AOT20N25L units undergo pre-shipment inspection (PSI). If there is an issue with AOT20N25L, 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 AOT20N25L part is unused and in its original packaging.

Return procedure for AOT20N25L:

1.Submit a request within 90 days.

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

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