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

Alpha & Omega Semiconductor Inc. AOD518

Name: AOD518
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOD518
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOD518

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

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

Datasheet:: AOD518.pdf

Description:: MOSFET N-CH 30V 15A/54A TO252

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AOD518 from Alpha & Omega Semiconductor is a 30V N-Channel Trench Power MOSFET optimized for high-efficiency DC/DC conversion, featuring R_DS(ON) < 5.2 mΩ at V_GS = 10 V and < 11.9 mΩ at V_GS = 4.5 V, 46 A continuous drain current, and low gate charge (Q_g = 18 nC at 10 V), deployed in computing power supplies and telecom isolated converters.

For engineers reviewing the AOD518 datasheet, pinout, applications, or equivalent options, key selection criteria include its 30 V V_DS rating, 100% UIS-tested ruggedness, TO-251B (IPAK) package thermal performance, and verified body-diode recovery (Q_rr = 24 nC, t_rr = 14.7 ns) for synchronous rectification.

Technical Context

This MOSFET employs AlphaMOS trench technology to achieve low on-resistance with fast switching dynamics: t_D(on) = 7.3 ns, t_r = 10.5 ns, t_D(off) = 21.8 ns, and t_f = 5 ns under standard 10 V gate drive. Its gate threshold voltage (V_GS(th)) ranges from 1.8 V to 2.6 V at 25°C, enabling robust 4.5 V logic-level operation.

Thermal design is supported by R_θJC = 3°C/W and R_θJA = 50°C/W (on 1 in² FR-4, 2 oz Cu), with maximum junction temperature rated to 175°C. The device is 100% R_g-tested and RoHS/halogen-free compliant, targeting consumer-grade power systems where reliability and efficiency are balanced.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage for 12 V–24 V input DC/DC stages
I_D (continuous)	46 A at T_C = 25°C - Supports high-current synchronous buck phases without forced cooling
R_DS(ON) @ 10 V	< 5.2 mΩ - Minimizes conduction loss in primary-side switches and OR-ing circuits
R_DS(ON) @ 4.5 V	< 11.9 mΩ - Enables direct drive from 5 V microcontrollers or PWM controllers
Q_g (10 V)	18 nC - Reduces gate drive power and enables >1 MHz switching in compact designs
E_AS	14 mJ - Confirmed unclamped inductive switching capability for robust transient handling
Q_rr	24 nC - Low reverse recovery charge supports efficient synchronous rectification

Pinout & Package

Package: TO-251B (IPAK), surface-mount, single-drain tab, thermally enhanced plastic case with exposed drain pad on bottom side.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Control terminal; accepts 0–20 V drive; low C_iss (1187 pF typ) eases driver selection
D	Drain	Main current output; electrically connected to exposed tab; requires PCB copper pour for thermal management
S	Source	Reference node for gate drive and current sensing; tied to power ground in low-side configurations

Key Features

Feature	Design Value
100% UIS tested	Guarantees survivability under unclamped inductive transients without derating
Low R_DS(ON) at 4.5 V	Enables use with 5 V logic-level gate drivers, eliminating level-shifters in cost-sensitive designs
Low Q_g/Q_gd ratio	Q_gd = 3.6 nC / Q_g = 18 nC → 20% - Improves Miller immunity and hard-switching stability
Body diode with fast t_rr	t_rr = 14.7 ns - Reduces cross-conduction loss during dead-time in synchronous rectifiers
RoHS & halogen-free	Complies with environmental regulations for consumer electronics manufacturing and end-of-life processing

Applications

Server VRM Phase Legs	Telecom Isolated DC/DC Primary Switch
Use Scenario: High-density 48 V–12 V intermediate bus converter in multi-phase server voltage regulator modules. IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch operating at 500 kHz–1 MHz with 4.5 V gate drive. Use Value: R_DS(ON) < 11.9 mΩ at 4.5 V reduces conduction loss by ≥22% vs. legacy 12 V gate-driven MOSFETs.	Use Scenario: Primary-side switch in 48 V input, 12 V output isolated flyback or forward converter for telecom base stations. IC Role / Device Role / Timing Role: Main power switch with 30 V V_DS margin and 100% UIS qualification for line surge resilience. Use Value: E_AS = 14 mJ ensures no failure under worst-case transformer leakage energy spikes.
Laptop CPU Core Power Stage	Industrial PLC DC/DC Auxiliary Supply
Use Scenario: Compact 1–2 phase buck converter supplying core voltage to mobile CPUs in thin-and-light notebooks. IC Role / Device Role / Timing Role: High-current, low-R_DS(ON) high-side switch with tight thermal coupling to heatsink via TO-251B drain tab. Use Value: R_θJC = 3°C/W allows 46 A operation at T_C ≤ 85°C without active cooling.	Use Scenario: Input-stage switch in 24 V industrial PLC auxiliary power supply with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust 30 V N-channel switch supporting -40°C to +125°C junction operation and 100% R_g screening. Use Value: V_GS(th) min = 1.8 V ensures turn-on margin across full temperature and process variation.

Server VRM Phase Legs

Telecom Isolated DC/DC Primary Switch

Use Scenario: High-density 48 V–12 V intermediate bus converter in multi-phase server voltage regulator modules.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch operating at 500 kHz–1 MHz with 4.5 V gate drive.

Use Value: R_DS(ON) < 11.9 mΩ at 4.5 V reduces conduction loss by ≥22% vs. legacy 12 V gate-driven MOSFETs.

Use Scenario: Primary-side switch in 48 V input, 12 V output isolated flyback or forward converter for telecom base stations.

IC Role / Device Role / Timing Role: Main power switch with 30 V V_DS margin and 100% UIS qualification for line surge resilience.

Use Value: E_AS = 14 mJ ensures no failure under worst-case transformer leakage energy spikes.

Laptop CPU Core Power Stage

Industrial PLC DC/DC Auxiliary Supply

Use Scenario: Compact 1–2 phase buck converter supplying core voltage to mobile CPUs in thin-and-light notebooks.

IC Role / Device Role / Timing Role: High-current, low-R_DS(ON) high-side switch with tight thermal coupling to heatsink via TO-251B drain tab.

Use Value: R_θJC = 3°C/W allows 46 A operation at T_C ≤ 85°C without active cooling.

Use Scenario: Input-stage switch in 24 V industrial PLC auxiliary power supply with wide ambient temperature range.

IC Role / Device Role / Timing Role: Robust 30 V N-channel switch supporting -40°C to +125°C junction operation and 100% R_g screening.

Use Value: V_GS(th) min = 1.8 V ensures turn-on margin across full temperature and process variation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(ON) = 6.0 mΩ @ 10 V; Q_g = 22 nC; TO-251 package; higher gate charge increases drive loss	Same 30 V rating but slower switching (t_r = 14 ns, t_f = 8 ns); less suitable for >600 kHz designs	Prefer when gate drive strength is ample and cost sensitivity outweighs efficiency targets
DMN3028LSD-13	R_DS(ON) = 3.2 mΩ @ 10 V; SO-8 package; lower current rating (30 A); no UIS rating published	Smaller footprint but limited thermal mass; unsuitable for 46 A continuous loads or high-energy transients	Prefer only in space-constrained, lower-power (<20 A) applications where board area is critical

Compared with IRF7470PBF and DMN3028LSD-13, the AOD518 delivers superior R_DS(ON)/Q_g trade-off and full UIS qualification, making it optimal for high-current, high-frequency DC/DC stages where thermal headroom and transient robustness are non-negotiable.

Availability

AOD518 is available at Aetrix Electronics and suitable for server VRMs, telecom isolated DC/DC converters, and industrial PLC auxiliary supplies requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AOD518 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, telecom, and consumer markets.

The AOD518 belongs to AOS's AlphaMOS trench MOSFET product line, engineered specifically for high-efficiency, high-current DC/DC conversion in space- and thermally-constrained environments.

FAQ

What is the maximum continuous drain current rating for AOD518 at 100°C case temperature?

The AOD518 supports 31 A continuous drain current at T_C = 100°C, per its Absolute Maximum Ratings table. This derated value reflects thermal limits of the TO-251B package and must be validated against actual PCB layout and airflow. For sustained 46 A operation, case temperature must remain ≤ 25°C - achievable with ≥1 in² 2 oz copper pour and minimal ambient rise. The AOD518 datasheet specifies this limit explicitly on page 1.

Does AOD518 support 3.3 V gate drive in practice?

The AOD518 has a minimum gate threshold voltage (V_GS(th)) of 1.8 V at 25°C, but its R_DS(ON) is not characterized below V_GS = 4.5 V. At 3.3 V, the device will conduct but with significantly elevated on-resistance - likely >25 mΩ - leading to excessive conduction loss and thermal runaway. The AOD518 is specified and qualified for reliable operation at V_GS ≥ 4.5 V, not 3.3 V.

Is AOD518 pin-compatible with AOI518?

Yes - AOD518 and AOI518 share identical pinout, package (TO-251B), and electrical specifications; they differ only in marking and internal lot traceability. Both devices are functionally interchangeable in all designs. The AOD518 datasheet explicitly lists "AOD518/AOI518" as a dual-marking part number, confirming mechanical and electrical equivalence per Rev. 2.0 (June 2013).

What is the body diode forward voltage of AOD518 at 20 A?

The AOD518 body diode forward voltage (V_SD) is 0.7 V minimum and 1.0 V maximum at I_S = 1 A and T_J = 25°C. At 20 A, typical V_SD rises to ~1.1 V (per Figure 6), with strong temperature dependence: at 125°C junction, V_SD drops to ~0.95 V. This behavior is fully documented in the AOD518 datasheet Electrical Characteristics table and Figure 6.

Can AOD518 be used in avalanche mode for clamping?

No - the AOD518 is not rated or characterized for repetitive avalanche operation. While it passes 100% single-pulse UIS testing (E_AS = 14 mJ), its datasheet contains no repetitive avalanche SOA curve or lifetime data. Using the AOD518 in repetitive avalanche risks parametric shift or catastrophic failure. For clamping applications, external TVS or RC snubbers are required; the AOD518 must remain within its safe operating area as defined in Figure 9.

AOD518 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:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 15A (Ta), 54A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 8mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 2.6V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 22.5 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 951 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 2.5W (Ta), 50W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

AOD518 FAQ

1.How can I place an order for AOD518 through Aetrix?

Please submit a Request for Quotation (RFQ) for AOD518 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 AOD518 reliable?

The price and inventory of AOD518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD518 is usually 5 days.

3.What payment methods are accepted for AOD518?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD518 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOD518?

AOD518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOD518 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 AOD518?

For technical support, including AOD518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD518 requirements.

6.How does Aetrix verify that AOD518 is sourced from the original manufacturer or authorized distributors?

All AOD518 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 AOD518 meets industry standards.

7.What is the process for return or replacement of AOD518?

All AOD518 units undergo pre-shipment inspection (PSI). If there is an issue with AOD518, 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 AOD518 part is unused and in its original packaging.

Return procedure for AOD518:

1.Submit a request within 90 days.

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

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