AOD492 N-Channel MOSFET 30V 85A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD492 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 85A continuous drain current in the TO-252 (DPAK) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The AOD492 belongs to the SRFET™ series and features a Schottky diode body with integrated gate charge characteristics suitable for switching applications requiring moderate to high current handling in compact form factors.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	85	A (Tc)
On-Resistance (Rds On) @ 20A, 10V	4.4	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.2	V
Gate Charge (Qg) @ 10V	74	nC
Input Capacitance (Ciss) @ 15V	4512	pF
Power Dissipation (Max)	2.5 (Ta), 100 (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3, DPAK	Surface Mount
FET Type	N-Channel	MOSFET
Technology	Metal Oxide	MOSFET

Substitute Part Grouping Explanation

Substitution of the AOD492 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 30V
Package Type: Must be TO-252-3, DPAK (2 Leads + Tab), SC-63 surface mount
FET Type: Must be N-Channel MOSFET
Operating Temperature Range: Must support -55°C to 175°C (TJ) minimum
Continuous Drain Current (Id): Must meet or exceed 85A (Tc) rating

Secondary Compatibility Parameters:

Gate Threshold Voltage (Vgs(th)): Acceptable range 2.2V to 2.5V @ 250µA
On-Resistance (Rds On): Lower values indicate improved performance; acceptable range 3.9mOhm to 5.5mOhm @ 10V
Gate Charge (Qg): Lower values reduce switching losses; range 14nC to 118nC @ 4.5V to 10V
Input Capacitance (Ciss): Range 1710pF to 5160pF @ 15V to 25V
Maximum Gate Voltage (Vgs): Must support ±20V minimum

Mechanical Compatibility:

All substitute parts must use identical TO-252-3 DPAK package footprint
Moisture Sensitivity Level (MSL): 1 (Unlimited) acceptable
REACH and ECCN compliance maintained across all substitutes

Substitutes are grouped by current rating capability and on-resistance characteristics, with active product status preferred for long-term availability.

Parameter Comparison

Parameter	AOD492	FDD8870	IPD040N03LGATMA1	NTD4965NT4G	NVD4C05NT4G	STD100N3LF3	STD86N3LH5	STD96N3LLH6	TSM040N03CP ROG
Vdss (V)	30	30	30	30	30	30	30	30	30
Id @ 25°C (A, Tc)	85	160	90	68	90	80	80	80	90
Rds On (mOhm) @ 10V	4.4	3.9	4.0	4.7	4.1	5.5	5.0	4.2	4.0
Vgs(th) (V) @ 250µA	2.2	2.5	2.2	2.5	2.2	2.5	2.5	2.5	2.5
Qg (nC) @ Vgs	74 @ 10V	118 @ 10V	38 @ 10V	17.2 @ 4.5V	14 @ 4.5V	27 @ 5V	14 @ 5V	20 @ 4.5V	53 @ 4.5V
Ciss (pF) @ Vds	4512 @ 15V	5160 @ 15V	3900 @ 15V	1710 @ 15V	1950 @ 25V	2060 @ 25V	1850 @ 25V	2200 @ 25V	2200 @ 25V
Power Dissipation (W, Tc)	100	160	79	N/A	57	110	70	70	88
Operating Temp (°C, TJ)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	175	175	150
Package	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Product Status	Obsolete	Obsolete	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	N/A	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

IPD040N03LGATMA1 (Infineon Technologies) is the preferred substitute for new designs. This part maintains active product status, ensuring long-term availability and supply chain stability. It delivers 90A continuous drain current, exceeding the AOD492 specification by 5A, with superior on-resistance of 4.0mOhm and reduced gate charge of 38nC. ROHS3 compliance and AEC-Q101 qualification support automotive and industrial applications. The OptiMOS™ series technology provides improved thermal performance with 79W power dissipation capability.

NVD4C05NT4G (onsemi) provides an alternative with active status and automotive-grade AEC-Q101 qualification. This part delivers 90A continuous drain current with 4.1mOhm on-resistance and significantly reduced gate charge of 14nC, resulting in lower switching losses. ROHS3 compliance and Digi-Reel® packaging support high-volume production environments.

STD86N3LH5 (STMicroelectronics) offers active product status with automotive-grade AEC-Q101 qualification. Rated for 80A continuous drain current with 5.0mOhm on-resistance and 14nC gate charge, this STripFET™ V series device provides reliable performance in cost-sensitive applications. ROHS3 compliance is maintained.

Secondary Substitutes (Extended Current Capability):

FDD8870 (onsemi) provides the highest current rating at 160A continuous drain current, suitable for applications requiring maximum current handling. Despite obsolete status, this PowerTrench® device offers superior thermal performance with 160W power dissipation. On-resistance of 3.9mOhm and 118nC gate charge characterize this high-performance option.

STD100N3LF3 (STMicroelectronics) delivers 80A continuous drain current with 110W power dissipation capability. Although obsolete, this STripFET™ II series device provides higher power handling than the AOD492 with 5.5mOhm on-resistance and 27nC gate charge.

TSM040N03CP ROG (Taiwan Semiconductor Corporation) offers active status with 90A continuous drain current and 88W power dissipation. This device provides balanced performance with 4.0mOhm on-resistance and 53nC gate charge. Note: Operating temperature maximum of 150°C (TJ) is lower than the AOD492 specification.

Tertiary Substitute (Lower Current Applications):

NTD4965NT4G (onsemi) is suitable only for applications where 68A continuous drain current is acceptable. This active-status device features the lowest gate charge at 17.2nC and lowest input capacitance at 1710pF, optimizing switching performance in low-power applications. On-resistance of 4.7mOhm and 1.39W power dissipation (Ta) indicate reduced thermal capability.

Compliance and Availability Considerations:

All active-status substitutes (IPD040N03LGATMA1, NVD4C05NT4G, STD86N3LH5, NTD4965NT4G, TSM040N03CP ROG) provide ROHS3 compliance and REACH unaffected status. Obsolete-status parts (FDD8870, STD100N3LF3) remain available in current inventory but lack long-term procurement guarantees. For new designs, active-status parts are recommended to ensure supply chain continuity beyond current inventory levels.

Frequently Asked Questions (FAQ)

Q: Can the AOD492 be directly replaced with any of these substitutes without PCB modification?

A: Yes. All substitute parts use identical TO-252-3 DPAK package footprint with 2 leads plus tab configuration. PCB layout and thermal management remain unchanged. No modifications to printed circuit board traces or component placement are required.

Q: What is the primary reason for finding substitutes for the AOD492?

A: The AOD492 is classified as obsolete. Obsolete status indicates the manufacturer has discontinued production and support. Substitute parts with active product status ensure continued availability, technical support, and compliance with current industry standards.

Q: Which substitute provides the closest electrical match to the AOD492?

A: IPD040N03LGATMA1 and NVD4C05NT4G provide the closest electrical match. Both deliver 90A continuous drain current (5A above AOD492 specification), maintain 2.2V gate threshold voltage, and support the full -55°C to 175°C operating temperature range. IPD040N03LGATMA1 offers superior on-resistance at 4.0mOhm with reduced gate charge of 38nC.

Q: Are there current rating differences between substitutes?

A: Yes. Continuous drain current (Id) ratings vary: FDD8870 (160A), IPD040N03LGATMA1 (90A), NVD4C05NT4G (90A), TSM040N03CP ROG (90A), STD100N3LF3 (80A), STD86N3LH5 (80A), STD96N3LLH6 (80A), and NTD4965NT4G (68A). Select substitutes based on application current requirements. Higher-rated devices provide design margin but may increase cost.

Q: What is the significance of on-resistance (Rds On) differences?

A: On-resistance directly affects power dissipation and thermal performance. Lower Rds On values reduce I²R losses during conduction. FDD8870 (3.9mOhm) and IPD040N03LGATMA1 (4.0mOhm) provide superior efficiency compared to STD100N3LF3 (5.5mOhm). For high-current applications, lower Rds On reduces heat generation and improves overall system efficiency.

Q: How does gate charge (Qg) affect circuit performance?

A: Gate charge determines switching speed and driver power requirements. Lower Qg values enable faster switching transitions and reduce gate driver power consumption. NVD4C05NT4G (14nC) and STD86N3LH5 (14nC) provide the lowest gate charge, optimizing switching frequency performance. AOD492 (74nC) and FDD8870 (118nC) require higher gate drive energy.

Q: Which substitutes are recommended for automotive applications?

A: NVD4C05NT4G and STD86N3LH5 carry AEC-Q101 automotive qualification. These parts meet automotive industry reliability and quality standards. IPD040N03LGATMA1 also supports automotive applications through Infineon's OptiMOS™ series qualification. Verify specific automotive requirements with application engineering before final selection.

Q: What is the difference between Ta and Tc current ratings?

A: Ta (ambient temperature) ratings specify continuous current at 25°C ambient conditions without forced cooling. Tc (case temperature) ratings specify continuous current with active thermal management at the device case. Tc ratings are typically higher and represent maximum sustainable current under proper thermal design. Select based on actual thermal management capability in the application.

Q: Are there packaging format differences among substitutes?

A: All substitutes use TO-252-3 DPAK surface mount package. Packaging formats vary: Cut Tape (CT), Tape & Reel (TR), and Digi-Reel® options. These represent different supply formats for manufacturing processes. Electrical and mechanical compatibility remains identical across all packaging formats.

Q: What is the impact of input capacitance (Ciss) on circuit design?

A: Input capacitance affects gate drive circuit impedance and switching transient response. Higher Ciss values increase gate charge requirements and may require higher gate drive current. NTD4965NT4G (1710pF) and NVD4C05NT4G (1950pF) provide lower capacitance, reducing gate driver stress. AOD492 (4512pF) and FDD8870 (5160pF) require more robust gate drive circuits.

Q: Can substitutes with lower current ratings be used in AOD492 applications?

A: NTD4965NT4G (68A) can be used only if application current requirements do not exceed 68A continuous drain current. This device provides reduced thermal capability (1.39W Ta) and lower power dissipation. Verify application current profile and thermal requirements before selecting lower-rated substitutes.

Q: What is the operating temperature range impact on substitute selection?

A: AOD492 supports -55°C to 175°C (TJ). Most substitutes maintain this range. TSM040N03CP ROG operates to 150°C (TJ) maximum, limiting use in high-temperature applications. STD86N3LH5 and STD96N3LLH6 specify 175°C (TJ) without lower temperature specification. Verify application temperature extremes match substitute specifications.

Q: How do ROHS3 compliance and REACH status affect substitute selection?

A: All active-status substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Obsolete-status parts (FDD8870, STD100N3LF3) maintain ROHS3 compliance but lack ongoing regulatory support. For new designs and long-term applications, active-status parts ensure compliance continuity.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates ongoing manufacturer production, technical support, and supply availability. Obsolete status indicates discontinued production with limited remaining inventory. For new designs, active-status substitutes (IPD040N03LGATMA1, NVD4C05NT4G, STD86N3LH5, NTD4965NT4G, TSM040N03CP ROG) ensure long-term design support and procurement continuity.

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