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

Alpha & Omega Semiconductor Inc. AOD458

Name: AOD458
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOD458
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOD458

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: AOD458.pdf

Description:: MOSFET N CH 250V 14A TO252

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOD458 from Alpha & Omega Semiconductor is a 250V, 14A N-Channel enhancement-mode MOSFET in TO-252 (DPAK) package, featuring R_DS(on) ≤ 0.28 Ω at V_GS = 10 V, 100% UIS-tested avalanche ruggedness, and optimized for high-efficiency boost converters and synchronous rectifiers in offline AC-DC power supplies.

For engineers reviewing the AOD458 datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed unclamped inductive switching capability (E_AS = 346 mJ), low C_iss/C_rss (637 pF / 7.1 pF typ), and thermal performance with R_θJC = 0.7 °C/W - critical for compact industrial and LED backlighting designs.

Technical Context

The AOD458 employs a high-voltage trench MOSFET process enabling robust operation up to T_J = 175°C, with BVDSS = 250 V (min) and temperature coefficient of 0.27 V/°C. Its gate threshold voltage (V_GS(th) = 3.0–4.5 V) ensures reliable turn-on under wide input conditions while maintaining low leakage (I_GSS ≤ ±100 nA).

Designed for hard-switched topologies, it delivers fast switching with t_D(on) = 21 ns, t_r = 58 ns, and Q_g = 12 nC (typ), supported by low gate resistance (R_g = 2.6 Ω typ) and body diode recovery time t_rr = 150 ns (typ) at I_F = 14 A, dI/dt = 100 A/μs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	250 V - supports primary-side switching in universal-input (85–265 VAC) offline SMPS without derating
R_DS(on) @ V_GS=10 V	≤ 0.28 Ω - enables <1.6 W conduction loss at 14 A DC, reducing heatsink requirements
I_D (continuous)	14 A @ T_C = 25°C - rated for sustained current in boost PFC and LLC secondary-side rectification
E_AS	346 mJ - guarantees single-pulse avalanche survival in inductive load transients without snubbers
C_iss/C_rss	637 pF / 7.1 pF (typ) - minimizes Miller effect and improves dv/dt immunity in high-frequency operation
Q_g	12 nC (typ) - allows efficient gate drive with standard 1-A controllers, reducing driver losses
R_θJC	0.7 °C/W - enables >15 W dissipation with modest heatsinking, supporting high-power density layouts

Pinout & Package

Package: TO-252 (DPAK), surface-mount, thermally enhanced with exposed drain pad on bottom side.

Pin/Terminal	Circuit Role	Design Meaning
Drain (D)	Main current path from source to load	Connected to exposed copper pad - must be soldered to large PCB copper area for thermal management
Gate (G)	Control terminal for channel conduction	High-impedance input requiring low-inductance gate loop; sensitive to ESD (±30 V max rating)
Source (S)	Reference node for gate drive and current return	Common connection point for gate driver ground and load return; defines V_GS reference

Key Features

Feature	Design Value
100% UIS tested	Guarantees avalanche energy handling up to 346 mJ per pulse - eliminates need for external clamping in boost/PFC stages
Low C_rss (7.1 pF typ)	Reduces Miller-induced false turn-on during high dv/dt switching, improving reliability in high-side configurations
Optimized body diode (t_rr = 150 ns)	Enables efficient synchronous rectification in flyback/LLC converters without excessive reverse recovery loss
Rugged gate oxide (V_GS = ±30 V)	Withstands gate drive overshoot and noise in noisy power environments without degradation
Thermal performance (R_θJC = 0.7 °C/W)	Supports >15 W continuous power dissipation with minimal heatsink - ideal for space-constrained industrial modules

Applications

Boost PFC Converter	Synchronous Rectifier
Use Scenario: Used as active switch in continuous conduction mode (CCM) boost PFC stage for 100–300 W telecom and industrial power supplies. IC Role / Device Role / Timing Role: Main switching device controlling inductor current and shaping input current waveform. Use Value: Low R_DS(on) and high avalanche rating reduce conduction loss and eliminate need for snubber circuits, improving efficiency and reliability.	Use Scenario: Replaces Schottky diode in secondary-side rectification of isolated DC-DC converters for LED backlighting and consumer adapters. IC Role / Device Role / Timing Role: Synchronously gated switch replacing passive diode to minimize forward voltage drop and reverse recovery loss. Use Value: Body diode t_rr = 150 ns and low Q_rr = 1.24 mC enable clean commutation at 100–300 kHz, increasing efficiency by 2–3% over diodes.
Industrial AC-DC Adapter	LED Driver Power Stage
Use Scenario: Primary-side switch in 65–150 W open-frame industrial adapters operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-voltage switching transistor in quasi-resonant (QR) or fixed-frequency flyback topology. Use Value: BVDSS = 250 V with 300 V surge rating and T_J = 175°C rating ensure long-term reliability under line surges and thermal stress.	Use Scenario: High-side switch in constant-current LED driver for commercial signage and architectural lighting systems. IC Role / Device Role / Timing Role: PWM-controlled current regulator modulating LED string current at 1–20 kHz. Use Value: Low Q_g = 12 nC and fast t_f = 33 ns support precise dimming control with minimal switching loss at high PWM frequencies.

Boost PFC Converter

Synchronous Rectifier

Use Scenario: Used as active switch in continuous conduction mode (CCM) boost PFC stage for 100–300 W telecom and industrial power supplies.

IC Role / Device Role / Timing Role: Main switching device controlling inductor current and shaping input current waveform.

Use Value: Low R_DS(on) and high avalanche rating reduce conduction loss and eliminate need for snubber circuits, improving efficiency and reliability.

Use Scenario: Replaces Schottky diode in secondary-side rectification of isolated DC-DC converters for LED backlighting and consumer adapters.

IC Role / Device Role / Timing Role: Synchronously gated switch replacing passive diode to minimize forward voltage drop and reverse recovery loss.

Use Value: Body diode t_rr = 150 ns and low Q_rr = 1.24 mC enable clean commutation at 100–300 kHz, increasing efficiency by 2–3% over diodes.

Industrial AC-DC Adapter

LED Driver Power Stage

Use Scenario: Primary-side switch in 65–150 W open-frame industrial adapters operating across -40°C to +85°C ambient.

IC Role / Device Role / Timing Role: High-voltage switching transistor in quasi-resonant (QR) or fixed-frequency flyback topology.

Use Value: BVDSS = 250 V with 300 V surge rating and T_J = 175°C rating ensure long-term reliability under line surges and thermal stress.

Use Scenario: High-side switch in constant-current LED driver for commercial signage and architectural lighting systems.

IC Role / Device Role / Timing Role: PWM-controlled current regulator modulating LED string current at 1–20 kHz.

Use Value: Low Q_g = 12 nC and fast t_f = 33 ns support precise dimming control with minimal switching loss at high PWM frequencies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-Channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP20NM50FP	Higher R_DS(on) (0.26 Ω min vs. 0.22 Ω typ), TO-220FP package, no UIS rating specified	Limited to lower-frequency (<100 kHz) applications due to higher C_iss (950 pF)	Acceptable where avalanche ruggedness is not required and board space permits through-hole mounting
IRF640NPBF	Lower voltage rating (200 V), higher R_DS(on) (0.18 Ω min), TO-220 package, no UIS test data published	Not suitable for 230 VAC mains-derived 250 V bus; requires additional overvoltage protection	Only viable in low-line (115 VAC) or DC-fed systems with strict voltage derating

Compared with STP20NM50FP and IRF640NPBF, the AOD458 offers superior avalanche ruggedness, lower gate charge, and surface-mount compatibility - making it the preferred choice for compact, high-reliability AC-DC and LED driver designs where thermal and layout constraints are critical.

Availability

AOD458 is available at Aetrix Electronics and suitable for boost PFC converters, synchronous rectifiers, and industrial AC-DC adapters requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for AOD458 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 power conversion and management.

The AOD458 belongs to AOS's high-voltage trench MOSFET product line, engineered specifically for rugged, high-efficiency offline power supply topologies including PFC, flyback, and resonant converters.

FAQ

What is the maximum continuous drain current rating for the AOD458?

The AOD458 has a continuous drain current rating of 14 A at case temperature T_C = 25°C. This rating decreases with rising case temperature - e.g., ~10 A at T_C = 100°C - per the derating curve in Figure 13. The AOD458 must be mounted on adequate copper area to maintain safe junction temperature under load.

Does the AOD458 have avalanche capability, and is it tested?

Yes, the AOD458 is 100% unclamped inductive switching (UIS) tested with E_AS = 346 mJ at T_J = 25°C. This rating is validated per JEDEC JESD24-11 and ensures reliable operation during inductive turn-off transients without external clamping - a key feature confirmed in the AOD458 datasheet, page 1.

What is the gate threshold voltage range for the AOD458?

The AOD458 has a gate threshold voltage V_GS(th) ranging from 3.0 V to 4.5 V at I_D = 250 μA, ensuring consistent turn-on behavior across temperature and process variation. This range allows compatibility with standard 5 V and 12 V gate drivers while avoiding unintended conduction near 0 V.

Can the AOD458 be used in synchronous rectification applications?

Yes, the AOD458 is explicitly recommended for synchronous rectification in the datasheet. Its body diode exhibits t_rr = 150 ns (typ) and Q_rr = 1.24 mC at I_F = 14 A, enabling efficient replacement of Schottky diodes in flyback and LLC converters up to 300 kHz.

What is the thermal resistance from junction to case (R_θJC) for the AOD458?

The AOD458 has a maximum junction-to-case thermal resistance R_θJC of 0.7 °C/W, measured with the device mounted to a large heatsink. This value is critical for calculating power dissipation limits when using external heatsinking - for example, enabling >15 W continuous dissipation with ΔT = 10.5°C rise above case temperature.

AOD458 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 250 V

Current - Continuous Drain (Id) @ 25°C:: 14A (Tc)

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

Rds On (Max) @ Id, Vgs:: 280mOhm @ 7A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 15 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 770 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 150W (Tc)

Operating Temperature:: -50°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

AOD458 FAQ

1.How can I place an order for AOD458 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOD458 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 AOD458 reliable?

The price and inventory of AOD458 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD458 is usually 5 days.

3.What payment methods are accepted for AOD458?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD458 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOD458?

AOD458 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOD458 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 AOD458?

For technical support, including AOD458 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD458 requirements.

6.How does Aetrix verify that AOD458 is sourced from the original manufacturer or authorized distributors?

All AOD458 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 AOD458 meets industry standards.

7.What is the process for return or replacement of AOD458?

All AOD458 units undergo pre-shipment inspection (PSI). If there is an issue with AOD458, 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 AOD458 part is unused and in its original packaging.

Return procedure for AOD458:

1.Submit a request within 90 days.

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

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