AOB254L N-Channel 150V MOSFET Equivalent & Substitute Parts

Part Overview

The AOB254L is an N-Channel 150V MOSFET manufactured by Alpha & Omega Semiconductor Inc., housed in a TO-263 (D2PAK) surface mount package. This device is rated for 4.2A continuous drain current at ambient temperature (Ta) and 32A at case temperature (Tc), with a maximum power dissipation of 2.1W (Ta) and 125W (Tc). The part is currently in active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the AOB254L reaches end-of-life, experiences supply constraints, or when application requirements demand enhanced electrical performance characteristics such as higher continuous current ratings, improved on-resistance specifications, or increased power dissipation capabilities. All substitute parts listed maintain the same 150V drain-to-source voltage rating and TO-263 (D2PAK) package configuration, ensuring mechanical and electrical compatibility within the specified parameter envelope.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	150	V
Continuous Drain Current @ 25°C (Tc)	32	A
Continuous Drain Current @ 25°C (Ta)	4.2	A
On-Resistance (Rds On) @ 20A, 10V	46	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.7	V
Gate Charge (Qg) @ 10V	40	nC
Input Capacitance (Ciss) @ 75V	2150	pF
Power Dissipation (Tc)	125	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263 (D2PAK)	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the AOB254L is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): Must equal 150V
Package Type: Must be TO-263 (D2PAK) or TO-263-3 variant
Mounting Type: Must be Surface Mount
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)

Performance Enhancement Parameters (Allowable Variations):

Continuous Drain Current (Id): Substitute parts may exceed 32A (Tc) rating
On-Resistance (Rds On): Substitute parts may have equal or lower values
Power Dissipation (Tc): Substitute parts may exceed 125W rating
Gate Charge (Qg): Substitute parts may have equal or lower values
Operating Temperature Range: Substitute parts must support minimum -55°C to 175°C range

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed maintain 150V Vdss rating and TO-263 (D2PAK) package configuration. Substitutes are grouped by continuous drain current capability and on-resistance performance, enabling selection based on specific application thermal and current requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On @ 10V (mOhm)	Qg @ 10V (nC)	Ciss @ 25V (pF)	Power Diss. Tc (W)	Temp Range (°C)	Product Status
AOB254L	Alpha & Omega Semiconductor	150	32	46	40	2150	125	-55 to 175	Active
FDB390N15A	onsemi	150	27	39	18.6	1285	75	-55 to 175	Active
IRF3415STRLPBF	Infineon Technologies	150	43	42	200	2400	200	-55 to 175	Active
IRFS4615TRLPBF	Infineon Technologies	150	33	42	40	1750	144	-55 to 175	Active
IXTA42N15T	IXYS	150	42	45	21	1880	200	-55 to 175	Active
IXTA56N15T	IXYS	150	56	36	34	2250	300	-55 to 175	Active
IXTA62N15P	IXYS	150	62	40	70	2250	350	-55 to 175	Active
NTB35N15T4G	onsemi	150	37	50	100	3200	178	-55 to 150	Obsolete
PHB45NQ15T,118	Nexperia USA Inc.	150	45.1	42	32	1770	230	-55 to 175	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Temperature Range):

The following parts are recommended as direct substitutes based on active product status and full operating temperature range support (-55°C to 175°C):

IRFS4615TRLPBF: Infineon Technologies HEXFET series. Continuous drain current of 33A (Tc) with 42mOhm on-resistance. Power dissipation of 144W (Tc) exceeds AOB254L capability. Gate charge of 40nC matches AOB254L specification. Suitable for applications requiring equivalent or slightly higher current handling with improved thermal performance.
IXTA42N15T: IXYS Trench series. Continuous drain current of 42A (Tc) with 45mOhm on-resistance. Power dissipation of 200W (Tc) provides significant thermal margin. Gate charge of 21nC is lower than AOB254L, reducing switching losses. Vgs(Max) of ±30V provides extended gate voltage tolerance.
IXTA56N15T: IXYS Trench series. Continuous drain current of 56A (Tc) with 36mOhm on-resistance. Power dissipation of 300W (Tc) supports high-current applications. Gate charge of 34nC and Vgs(Max) of ±30V provide favorable switching characteristics. Recommended for applications requiring maximum current capacity and thermal headroom.
IXTA62N15P: IXYS Polar series. Continuous drain current of 62A (Tc) with 40mOhm on-resistance. Power dissipation of 350W (Tc) provides maximum thermal capability. Gate charge of 70nC is higher than AOB254L, requiring consideration in high-frequency switching applications.
PHB45NQ15T,118: Nexperia USA Inc. TrenchMOS series. Continuous drain current of 45.1A (Tc) with 42mOhm on-resistance. Power dissipation of 230W (Tc) supports enhanced thermal performance. Gate charge of 32nC and input capacitance of 1770pF provide efficient switching characteristics.

Secondary Substitutes (Active Status, Reduced Temperature Range or Performance Trade-offs):

FDB390N15A: onsemi PowerTrench series. Continuous drain current of 27A (Tc) with 39mOhm on-resistance. Power dissipation of 75W (Tc) is lower than AOB254L. Gate charge of 18.6nC and input capacitance of 1285pF provide lowest switching losses among all substitutes. Suitable for applications where current requirements are lower and switching efficiency is prioritized.

Not Recommended:

NTB35N15T4G: onsemi part marked as Obsolete product status. Operating temperature range limited to -55°C to 150°C, below the -55°C to 175°C range of AOB254L. Gate charge of 100nC significantly exceeds AOB254L specification. Not suitable for new designs or long-term supply assurance.

All recommended active substitutes maintain RoHS3 compliance, MSL 1 rating, and REACH Unaffected status consistent with AOB254L specifications.

Frequently Asked Questions (FAQ)

Q: Can I use IXTA56N15T as a direct replacement for AOB254L in my existing circuit?

A: Yes, IXTA56N15T is mechanically and electrically compatible. Both devices share 150V Vdss rating and TO-263 (D2PAK) package configuration. IXTA56N15T provides higher continuous drain current (56A vs. 32A) and lower on-resistance (36mOhm vs. 46mOhm), resulting in improved thermal performance. No circuit modifications are required. Verify that your PCB layout and thermal management accommodate the enhanced performance characteristics.

Q: What is the difference between the continuous drain current ratings (Ta) and (Tc)?

A: (Ta) represents continuous drain current at ambient temperature, typically 25°C, with the device operating in free air. (Tc) represents continuous drain current at case temperature, typically 25°C, with the device mounted on a PCB with defined thermal conditions. (Tc) ratings are higher because case temperature measurement assumes better heat dissipation through the package leads and PCB. For most applications, use the (Tc) rating as it reflects realistic operating conditions with proper PCB thermal design.

Q: Why does NTB35N15T4G show as Obsolete?

A: NTB35N15T4G is marked as Obsolete product status by onsemi, indicating it is no longer in active production and may have limited availability. Additionally, its maximum operating temperature is limited to 150°C, below the 175°C maximum of AOB254L. For new designs and long-term supply assurance, select from the Active status substitutes listed.

Q: How do I choose between IXTA42N15T and IXTA56N15T?

A: Both are IXYS Trench series devices with 150V Vdss and TO-263 (D2PAK) packages. IXTA42N15T provides 42A continuous drain current with 45mOhm on-resistance and 200W power dissipation. IXTA56N15T provides 56A continuous drain current with 36mOhm on-resistance and 300W power dissipation. Select IXTA42N15T for applications with moderate current requirements and cost sensitivity. Select IXTA56N15T for high-current applications or designs requiring maximum thermal margin and lowest on-resistance.

Q: What does Gate Charge (Qg) mean and why does it vary among substitutes?

A: Gate Charge (Qg) is the total charge required to switch the MOSFET from off to on state at a specified gate voltage (typically 10V). Lower gate charge reduces switching losses and allows faster switching speeds, beneficial in high-frequency applications. FDB390N15A has the lowest gate charge (18.6nC), making it suitable for high-frequency switching circuits. IXTA62N15P has the highest gate charge (70nC), which may increase switching losses but does not affect DC performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are RoHS3 compliant and have REACH Unaffected status, matching the AOB254L compliance profile. All parts have MSL 1 (Unlimited) moisture sensitivity level, allowing standard handling and storage procedures.

Q: Can I use PHB45NQ15T,118 in a circuit designed for AOB254L?

A: Yes, PHB45NQ15T,118 is fully compatible. It provides 45.1A continuous drain current with 42mOhm on-resistance, 230W power dissipation, and operates across the full -55°C to 175°C temperature range. Gate charge of 32nC is slightly lower than AOB254L (40nC), resulting in reduced switching losses. No circuit modifications are required.

Q: What is the significance of the TO-263-3 package designation?

A: TO-263-3 indicates a three-terminal surface mount package with two signal leads and one tab (typically connected to the drain). All substitute parts use this same package configuration, ensuring mechanical compatibility with existing PCB layouts. The tab provides the primary thermal path for heat dissipation from the device to the PCB.

Q: Why does IRF3415STRLPBF have a much higher Gate Charge (200nC) compared to other substitutes?

A: IRF3415STRLPBF is an Infineon HEXFET series device optimized for high current capability (43A) and power dissipation (200W). The higher gate charge reflects the larger die size and increased input capacitance (2400pF) required to support these performance levels. This device is suitable for applications where current capacity and thermal performance are prioritized over switching speed. In high-frequency switching applications, lower gate charge devices such as FDB390N15A or IXTA42N15T may be more appropriate.

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