AOB266L N-Channel 60V 18A/140A MOSFET Equivalent & Substitute Parts

Part Overview

The AOB266L is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 60V drain-to-source voltage with continuous drain current of 18A at Ta (ambient temperature) and 140A at Tc (case temperature). The device is packaged in TO-263 (D2PAK) surface mount configuration and is currently in active production status with 10,165 pieces in stock.

This part is used in power switching applications requiring moderate to high current handling in a compact surface mount package. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the N-Channel MOSFET category.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current @ 25°C (Ta)	18	A
Continuous Drain Current @ 25°C (Tc)	140	A
On-Resistance (Rds On) @ 20A, 10V	3.2	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3.2	V
Gate Charge (Qg) @ 10V	80	nC
Input Capacitance (Ciss) @ 30V	6800	pF
Power Dissipation (Tc)	268	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263-3 (D2PAK)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the AOB266L are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 60V (exact match required)
Package Type: TO-263-3 (D2PAK) surface mount (exact match required)
FET Type: N-Channel MOSFET (exact match required)
Operating Temperature Range: -55°C to 175°C (exact match required)
Continuous Drain Current (Tc): 75A or greater (meets or exceeds 140A case temperature rating)
On-Resistance (Rds On): 3.0 to 4.0 mOhm range (comparable switching performance)
Gate Threshold Voltage (Vgs(th)): 2.1V to 4.5V (compatible gate drive requirements)
Maximum Gate Voltage (Vgs): ±20V (compatible with standard gate drive circuits)

Secondary Considerations:

RoHS3 compliance and REACH status alignment
Moisture Sensitivity Level (MSL): Level 1 (unlimited shelf life)
Product status: Active or Automotive-qualified parts preferred

Substitute parts are organized into two categories: Primary Substitutes (120A continuous drain current at Tc, superior performance margin) and Secondary Substitutes (75A to 90A continuous drain current at Tc, reduced performance margin but functionally compatible).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Power Diss. Tc (W)	Package	Status
AOB266L	Alpha & Omega Semiconductor	60	140	3.2	3.2	80	6800	268	TO-263-3	Active
BUK763R1-60E,118	Nexperia USA Inc.	60	120	3.1	4.0	114	8920	293	D2PAK	Active
BUK963R3-60E,118	Nexperia USA Inc.	60	120	3.0	2.1	95	13490	293	D2PAK	Active
FDB029N06	Fairchild Semiconductor	60	120	3.1	4.5	151	9815	231	TO-263	Active
FDB035AN06A0	Fairchild Semiconductor	60	80	3.5	4.0	124	6400	310	TO-263	Active
IPB029N06N3GATMA1	Infineon Technologies	60	120	2.9	4.0	165	13000	188	PG-TO263-3	Active
IPB034N06L3GATMA1	Infineon Technologies	60	90	3.4	2.2	79	13000	167	PG-TO263-3	Not For New Designs
IPB037N06N3GATMA1	Infineon Technologies	60	90	3.7	4.0	98	11000	188	PG-TO263-3	Active
IPB90N06S404ATMA2	Infineon Technologies	60	90	4.0	4.0	128	10400	150	PG-TO263-3	Obsolete
IRFS3206TRRPBF	Infineon Technologies	60	120	3.0	4.0	170	6540	300	D2PAK	Active
PSMN004-60B,118	Nexperia USA Inc.	60	75	3.6	4.0	168	8300	230	D2PAK	Active

Engineering Selection Recommendations

Primary Substitute Selection (120A Continuous Drain Current at Tc):

The following parts provide equivalent or superior electrical performance with active product status and full compliance certifications:

IPB029N06N3GATMA1 (Infineon Technologies): Lowest on-resistance at 2.9 mOhm, active status, ROHS3 compliant, MSL Level 1. Suitable for applications requiring maximum efficiency.
BUK963R3-60E,118 (Nexperia USA Inc.): Lowest gate threshold voltage at 2.1V, active status, automotive-qualified (AEC-Q101), ROHS3 compliant. Suitable for low-voltage gate drive circuits.
IRFS3206TRRPBF (Infineon Technologies): Highest power dissipation rating at 300W (Tc), active status, ROHS3 compliant, MSL Level 1. Suitable for high-power applications.
BUK763R1-60E,118 (Nexperia USA Inc.): Balanced performance, active status, automotive-qualified (AEC-Q101), ROHS3 compliant.
FDB029N06 (Fairchild Semiconductor): Active status, ROHS3 compliant. Suitable for general-purpose switching applications.

Secondary Substitute Selection (75A to 90A Continuous Drain Current at Tc):

These parts provide reduced current capacity but maintain electrical compatibility:

IPB037N06N3GATMA1 (Infineon Technologies): 90A continuous drain current, active status, ROHS3 compliant, MSL Level 1. Suitable for moderate-current applications.
FDB035AN06A0 (Fairchild Semiconductor): 80A continuous drain current, active status, highest power dissipation at 310W (Tc). Suitable for applications with thermal margin requirements.
PSMN004-60B,118 (Nexperia USA Inc.): 75A continuous drain current, active status, ROHS3 compliant, MSL Level 1. Suitable for lower-current switching applications.

Parts Not Recommended for New Designs:

IPB034N06L3GATMA1: Product status "Not For New Designs" indicates manufacturer discontinuation trajectory.
IPB90N06S404ATMA2: Obsolete product status. Avoid for new applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower continuous drain current (75A to 90A) in place of the AOB266L (140A)?

A: Substitution with lower current ratings is possible only if the application's actual current requirements do not exceed the substitute part's continuous drain current specification at case temperature (Tc). The AOB266L's 140A rating provides thermal margin; lower-rated substitutes reduce this margin. Verify application current requirements before selection.

Q: What is the difference between Ta (ambient temperature) and Tc (case temperature) ratings?

A: Ta represents continuous drain current at 25°C ambient temperature without active cooling. Tc represents continuous drain current at 25°C case temperature with thermal management (heatsinking). The AOB266L specifies 18A (Ta) and 140A (Tc), indicating significant performance improvement with proper thermal management. Substitute parts follow the same rating methodology.

Q: Are all substitute parts compatible with the same PCB layout and heatsink?

A: All substitute parts use TO-263-3 (D2PAK) or equivalent package designations, ensuring mechanical compatibility with standard TO-263 footprints and heatsinks. However, verify specific package dimensions with manufacturer datasheets, as minor variations may exist between manufacturers (e.g., Infineon's PG-TO263-3 versus standard TO-263-3).

Q: Which substitute part has the lowest on-resistance?

A: IPB029N06N3GATMA1 has the lowest on-resistance at 2.9 mOhm (measured at 100A, 10V gate voltage). Lower on-resistance reduces power dissipation and heat generation in switching applications.

Q: Are automotive-qualified parts required for this application?

A: Automotive qualification (AEC-Q101) is not required unless the application is automotive-grade. BUK763R1-60E,118 and BUK963R3-60E,118 carry AEC-Q101 qualification; other parts do not. Selection depends on application requirements, not part availability.

Q: What is the significance of gate threshold voltage (Vgs(th)) differences?

A: Gate threshold voltage determines the minimum gate-to-source voltage required to turn the MOSFET on. The AOB266L specifies 3.2V at 250µA. Substitute parts range from 2.1V to 4.5V. Lower threshold voltages (e.g., BUK963R3-60E,118 at 2.1V) allow operation with lower gate drive voltages; higher thresholds require stronger gate drive circuits. Verify gate drive circuit compatibility before substitution.

Q: Why do some substitute parts have higher gate charge (Qg) values?

A: Gate charge represents the total charge required to switch the MOSFET from off to on state. Higher gate charge (e.g., IRFS3206TRRPBF at 170 nC) requires more gate drive current and longer switching times. Lower gate charge (e.g., IPB034N06L3GATMA1 at 79 nC) enables faster switching and reduced gate drive power. Selection depends on gate driver circuit capabilities and switching frequency requirements.

Q: Can I substitute parts with different input capacitance (Ciss) values?

A: Input capacitance affects gate charge and switching speed. The AOB266L specifies 6800 pF at 30V. Substitute parts range from 6400 pF to 13,490 pF. Higher capacitance increases switching losses and gate drive requirements; lower capacitance reduces these factors. Verify gate driver circuit can supply required gate charge within specified switching frequency before substitution.

Q: What does RoHS3 compliance mean?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. All listed substitute parts are ROHS3 compliant, ensuring environmental and regulatory compatibility.

Q: Is MSL Level 1 important for my application?

A: Moisture Sensitivity Level (MSL) 1 indicates unlimited shelf life without moisture-control packaging. All listed parts carry MSL Level 1, allowing standard storage and handling without desiccant requirements or time-limited shelf life constraints.

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