AOB280L N-Channel MOSFET 80V 20.5A/140A TO-263 Equivalent & Substitute Parts

Part Overview

The AOB280L is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 80V drain-to-source voltage with continuous drain current ratings of 20.5A at Ta (ambient temperature) and 140A at Tc (case temperature). The device is housed in a Surface Mount TO-263 (D2PAK) package and is currently in Active product status with 4533 pieces in stock inventory.

Substitute parts become necessary when the AOB280L reaches end-of-life status, when supply chain constraints limit availability, or when design requirements call for alternative qualified sources. The substitute parts listed maintain electrical and mechanical compatibility within the specified parameter ranges for this MOSFET category.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	80	V
Continuous Drain Current @ 25°C (Ta)	20.5	A
Continuous Drain Current @ 25°C (Tc)	140	A
On-Resistance (Rds On) @ 20A, 10V	2.2	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3.4	V
Gate Charge (Qg) @ 10V	224	nC
Input Capacitance (Ciss) @ 40V	11135	pF
Power Dissipation (Tc)	333	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263 (D2PAK)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AOB280L is determined by the following critical parameters that must remain within acceptable ranges:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 80V
Continuous Drain Current (Tc): Must meet or exceed 140A at case temperature
On-Resistance (Rds On): Must not significantly exceed 2.2mOhm to maintain thermal performance
Gate Threshold Voltage (Vgs(th)): Must fall within the ±20V gate voltage specification
Operating Temperature Range: Must span -55°C to 175°C minimum

Mechanical Compatibility Criteria:

Package Type: Must be TO-263 (D2PAK) Surface Mount configuration
Mounting Type: Surface Mount only
Lead Configuration: 2 Leads + Tab (D2PAK standard)

Regulatory Compliance:

RoHS3 Compliance: Required
Moisture Sensitivity Level (MSL): Level 1 (Unlimited) preferred
REACH Status: REACH Unaffected

The substitute parts FDB86363-F085 and IPB025N08N3GATMA1 meet these criteria and are therefore electrically and mechanically interchangeable with the AOB280L within the specified parameter tolerances.

Parameter Comparison

Parameter	AOB280L (Alpha & Omega)	FDB86363-F085 (onsemi)	IPB025N08N3GATMA1 (Infineon)	Unit
Manufacturer	Alpha & Omega Semiconductor Inc.	onsemi	Infineon Technologies	—
Drain-to-Source Voltage (Vdss)	80	80	80	V
Continuous Drain Current (Tc)	140	110	120	A
On-Resistance (Rds On) @ 10V	2.2 @ 20A	2.4 @ 80A	2.5 @ 100A	mOhm
Gate Threshold Voltage (Vgs(th))	3.4 @ 250µA	4.0 @ 250µA	3.5 @ 270µA	V
Gate Charge (Qg) @ 10V	224	150	206	nC
Input Capacitance (Ciss) @ 40V	11135	10000	14200	pF
Power Dissipation (Tc)	333	300	300	W
Operating Temperature Range	-55 to 175	-55 to 175	-55 to 175	°C
Package Type	TO-263 (D2PAK)	TO-263 (D2PAK)	TO-263 (D2PAK)	—
Product Status	Active	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

Primary Substitute: IPB025N08N3GATMA1 (Infineon Technologies)

The IPB025N08N3GATMA1 is the preferred substitute for the AOB280L. This part maintains Active product status, ensuring long-term availability and supply chain stability. It meets all electrical specifications with a continuous drain current of 120A at Tc, which is within acceptable operating margins relative to the AOB280L's 140A rating. The device is RoHS3 compliant and carries MSL Level 1 (Unlimited) moisture sensitivity rating. The OptiMOS™ series designation indicates mature technology with established manufacturing processes. Current inventory of 16811 pieces provides supply security.

Secondary Substitute: FDB86363-F085 (onsemi)

The FDB86363-F085 is an alternative substitute with equivalent electrical characteristics. However, this part carries Obsolete product status, which limits its suitability for new designs or long-term production commitments. The PowerTrench® series technology is established, and the part is AEC-Q101 qualified for automotive applications. The continuous drain current rating of 110A at Tc is lower than the AOB280L's 140A, requiring thermal design verification in high-current applications. Current inventory of 1900 pieces is available but may not support extended production runs. This substitute is suitable only for replacement or repair applications where immediate availability is critical.

Both substitute parts are housed in identical TO-263 (D2PAK) Surface Mount packages and are pin-compatible with the AOB280L. All three devices operate across the -55°C to 175°C temperature range and comply with RoHS3 and REACH regulations.

Frequently Asked Questions (FAQ)

Q: Can the IPB025N08N3GATMA1 be used as a direct replacement for the AOB280L in all applications?

A: The IPB025N08N3GATMA1 is electrically and mechanically compatible with the AOB280L. Both devices share identical Vdss (80V), operating temperature range (-55°C to 175°C), and TO-263 (D2PAK) package configuration. The continuous drain current of 120A at Tc is lower than the AOB280L's 140A; therefore, applications operating at or near the AOB280L's maximum current rating require thermal analysis to confirm adequate performance margins.

Q: Why is the FDB86363-F085 listed as Obsolete when it is still in stock?

A: Product status reflects the manufacturer's commitment to continued production and support. Obsolete status indicates that onsemi has discontinued active manufacturing of the FDB86363-F085 and will not introduce design improvements or process enhancements. Existing inventory may remain available through distributors, but long-term supply cannot be guaranteed. For new designs, the Active-status IPB025N08N3GATMA1 is the recommended choice.

Q: Are there package compatibility concerns when substituting these parts?

A: All three parts—AOB280L, FDB86363-F085, and IPB025N08N3GATMA1—use the TO-263 (D2PAK) Surface Mount package with identical pin configurations (2 Leads + Tab). No PCB layout modifications are required for substitution. Thermal pad design and copper area should remain consistent to maintain power dissipation performance.

Q: What is the significance of the different On-Resistance (Rds On) values among these parts?

A: On-Resistance directly affects power dissipation and thermal performance. The AOB280L specifies 2.2mOhm @ 20A, 10V; the FDB86363-F085 specifies 2.4mOhm @ 80A, 10V; and the IPB025N08N3GATMA1 specifies 2.5mOhm @ 100A, 10V. These measurements are taken at different current levels, reflecting each manufacturer's characterization methodology. All values remain within acceptable ranges for 80V MOSFET applications. Higher current applications should prioritize the IPB025N08N3GATMA1 due to its Active status and established supply chain.

Q: Do all substitute parts meet the same regulatory compliance standards?

A: Yes. All three parts are RoHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. The FDB86363-F085 additionally carries AEC-Q101 automotive qualification, which is not specified for the AOB280L or IPB025N08N3GATMA1. This qualification is relevant only for automotive applications requiring explicit AEC-Q101 certification.

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

A: Ta (ambient temperature) current ratings assume operation in a 25°C ambient environment without active cooling. Tc (case temperature) ratings assume the device case is maintained at 25°C through thermal management (heatsinking). The AOB280L specifies 20.5A @ Ta and 140A @ Tc, indicating that proper thermal management is essential to achieve the higher current rating. Substitute parts should be evaluated using the same thermal design assumptions as the original AOB280L.

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