AOD254 N-Channel MOSFET 150V Equivalent & Substitute Parts

Part Overview

The AOD254 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 150V drain-to-source voltage with continuous drain current of 4.5A (Ta) and 28A (Tc). The device is housed in a TO-252 (DPAK) surface mount package and is designed for general-purpose switching applications requiring moderate power dissipation capabilities.

The AOD254 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

AOD254

Alpha & Omega Semiconductor Inc.In Stock: 10414AOD254 Datasheet

Current PartRFQ

AOD2544

Alpha & Omega Semiconductor Inc.In Stock: 1459AOD2544 Datasheet

MFR RecommendedRFQ

FDD390N15A

onsemiIn Stock: 43000FDD390N15A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AOD254 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain the 150V Vdss specification to ensure safe operation within the same voltage domain.

Package Compatibility: All substitute parts must use the TO-252 (DPAK) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts and thermal management designs.

Drain Current Capability: Substitute parts must support continuous drain current ratings at or above the application requirements. The AOD254 provides 4.5A (Ta) and 28A (Tc); substitutes may vary within acceptable operating ranges.

On-Resistance (Rds On): The AOD254 specifies 46mOhm @ 20A, 10V. Substitute parts with lower or comparable on-resistance values maintain or improve switching efficiency and thermal performance.

Gate Charge (Qg): The AOD254 specifies 40nC @ 10V. Lower gate charge values in substitutes reduce switching losses and improve gate drive efficiency.

Operating Temperature Range: The AOD254 operates from -55°C to 175°C. Substitute parts must support this range or a compatible subset.

Compliance & Status: All substitute parts must maintain RoHS3 compliance and active or equivalent product status to ensure long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

AOD2544 (Alpha & Omega Semiconductor Inc.)

The AOD2544 is an Active product from the same manufacturer as the AOD254, providing direct design continuity. It maintains the 150V Vdss rating and TO-252 (DPAK) package compatibility. The AOD2544 offers improved performance characteristics: higher continuous drain current (6.5A Ta, 23A Tc), lower gate charge (20nC vs. 40nC), and reduced input capacitance (675pF vs. 2150pF). These improvements result in lower switching losses and improved gate drive efficiency. The AOD2544 supports the full -55°C to 175°C operating temperature range and maintains RoHS3 compliance. This part is recommended as the primary substitute for direct replacement applications.

FDD390N15A (onsemi PowerTrench®)

The FDD390N15A is an Active product from onsemi, featuring the PowerTrench® technology platform. It maintains the 150V Vdss rating and TO-252AA (DPAK) package compatibility. The FDD390N15A delivers superior on-resistance performance (40mOhm @ 26A vs. 46mOhm @ 20A), supporting continuous drain current of 26A (Tc). Gate charge is minimized at 18.6nC, and input capacitance is 1285pF. The operating temperature range is -55°C to 150°C, which is 25°C lower than the AOD254 at the upper limit. The FDD390N15A maintains RoHS3 compliance. This part is suitable for applications where lower on-resistance and reduced switching losses are prioritized, provided the maximum operating temperature requirement does not exceed 150°C.

Both substitute parts are RoHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity ratings, and are REACH Unaffected. Selection between AOD2544 and FDD390N15A depends on specific application requirements regarding operating temperature range, on-resistance performance, and switching loss characteristics.

Frequently Asked Questions (FAQ)

Q: Can the AOD2544 be used as a direct replacement for the AOD254?

A: Yes. The AOD2544 maintains identical voltage rating (150V Vdss), package type (TO-252 DPAK), and operating temperature range (-55°C to 175°C). PCB layout and thermal management designs require no modification. The AOD2544 offers improved electrical performance with lower gate charge and input capacitance.

Q: What is the primary difference between the AOD2544 and FDD390N15A?

A: Both parts share the 150V Vdss rating and TO-252 DPAK package. The AOD2544 supports the full -55°C to 175°C temperature range, while the FDD390N15A operates to 150°C maximum. The FDD390N15A provides lower on-resistance (40mOhm vs. 54mOhm) and slightly lower gate charge (18.6nC vs. 20nC). Selection depends on application temperature requirements and switching loss priorities.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The AOD254, AOD2544, and FDD390N15A are all RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings. All parts are REACH Unaffected.

Q: Does the TO-252AA package used by the FDD390N15A differ from the TO-252 package?

A: The TO-252AA and TO-252 are both DPAK variants with identical mechanical footprints and pin configurations. Both are compatible with existing TO-252 (DPAK) PCB layouts. The "AA" designation indicates a specific onsemi variant within the DPAK family.

Q: What is the significance of lower gate charge in the substitute parts?

A: Lower gate charge (AOD2544: 20nC, FDD390N15A: 18.6nC vs. AOD254: 40nC) reduces the energy required to switch the transistor on and off. This results in lower switching losses, reduced heat generation, and improved overall circuit efficiency, particularly in high-frequency switching applications.

Q: Can the FDD390N15A be used in applications requiring operation above 150°C?

A: No. The FDD390N15A maximum operating temperature is 150°C (TJ). Applications requiring operation up to 175°C must use the AOD254 or AOD2544, both of which support -55°C to 175°C.

Q: How do the on-resistance specifications compare across the three parts?

A: AOD254 specifies 46mOhm @ 20A, 10V. AOD2544 specifies 54mOhm @ 5A, 10V. FDD390N15A specifies 40mOhm @ 26A, 10V. The FDD390N15A provides the lowest on-resistance at higher current levels, resulting in reduced conduction losses during high-current operation.

Q: Are inventory levels a consideration for part selection?

A: Inventory availability is provided for reference: AOD254 (10,365 pcs), AOD2544 (1,380 pcs), FDD390N15A (42,900 pcs). Long-term supply chain planning should account for current stock levels and product status. The AOD2544 and FDD390N15A are Active products with ongoing manufacturing support.