AO4292 N-Channel MOSFET 100V 8A Equivalent & Substitute Parts

Part Overview

The AO4292 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 100V drain-to-source voltage with 8A continuous drain current in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The AO4292 operates across a temperature range of -55°C to 150°C and is suitable for switching applications requiring moderate current handling in compact form factors.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	100	V
Current - Continuous Drain (Id) @ 25°C	8	A (Ta)
Rds On (Max) @ Id, Vgs	23 mOhm @ 8A, 10V	—
Vgs(th) (Max) @ Id	2.7	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	25	nC @ 10V
Vgs (Max)	±20	V
Input Capacitance (Ciss) (Max) @ Vds	1190	pF @ 50V
Power Dissipation (Max)	3.1	W (Ta)
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AO4292 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 100V
Continuous Drain Current (Id): Must support 8A or higher at 25°C
On-State Resistance (Rds On): Must not exceed 23 mOhm at rated conditions to maintain thermal performance
Gate-Source Voltage (Vgs): Must support ±20V maximum rating
Operating Temperature Range: Must span -55°C to 150°C

Mechanical Compatibility Criteria:

Package Type: 8-SOIC surface mount form factor
Mounting Type: Surface mount only
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling consistency
Pin Configuration: 8-pin SOIC footprint compatibility

All substitute parts listed maintain these electrical and mechanical parameters within acceptable tolerances for direct replacement in existing designs. Variations in gate charge, input capacitance, and power dissipation are acceptable provided they do not degrade circuit performance or thermal management.

Parameter Comparison

Parameter	AO4292	AO4292E	FDS3672	FDS86141	IRF7495TRPBF	IRF7853TRPBF	SI4056DY-T1-GE3
Manufacturer	Alpha & Omega	Alpha & Omega	onsemi	onsemi	Infineon	Infineon	Vishay Siliconix
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	100	100	100	100	100	100	100
Id @ 25°C (A)	8	8	7.5	7	7.3	8.3	11.1
Rds On (Max) @ 10V (mOhm)	23 @ 8A	—	23 @ 7.5A	23 @ 7A	22 @ 4.4A	18 @ 8.3A	23 @ 15A
Vgs(th) (Max) @ Id (V)	2.7 @ 250µA	—	4 @ 250µA	4 @ 250µA	4 @ 250µA	4.9 @ 100µA	2.8 @ 250µA
Qg (Max) @ 10V (nC)	25	—	37	16.5	51	39	29.5
Ciss (Max) @ Vds (pF)	1190 @ 50V	—	2015 @ 25V	934 @ 50V	1530 @ 25V	1640 @ 25V	900 @ 50V
Vgs (Max) (V)	±20	±20	±20	±20	±20	±20	±20
Power Dissipation (Max) (W)	3.1 (Ta)	—	2.5 (Ta)	2.5 (Ta)	2.5 (Ta)	2.5 (Ta)	2.5 (Ta) / 5.7 (Tc)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SO	8-SO	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: AO4292E

The AO4292E is the direct successor to the AO4292, manufactured by Alpha & Omega Semiconductor Inc. This part maintains identical electrical specifications and package configuration while offering active product status. The AO4292E is ROHS3 compliant and available in Tape & Reel packaging, providing superior supply chain continuity. Selection of the AO4292E eliminates design re-qualification requirements and maintains full compatibility with existing PCB layouts and assembly processes.

Secondary Substitutes: FDS3672, FDS86141, IRF7495TRPBF, IRF7853TRPBF, SI4056DY-T1-GE3

These alternatives are suitable when AO4292E availability is constrained. All substitute parts meet the 100V Vdss and 8-SOIC package requirements. Each part maintains electrical performance within acceptable operating margins:

FDS3672 (onsemi): Rated for 7.5A continuous drain current with 23 mOhm Rds On. Suitable for applications where current margin below 8A is acceptable.
FDS86141 (onsemi): Rated for 7A continuous drain current with 23 mOhm Rds On and lowest gate charge (16.5 nC). Appropriate for switching applications prioritizing reduced gate drive requirements.
IRF7495TRPBF (Infineon): Rated for 7.3A continuous drain current with 22 mOhm Rds On. Infineon HEXFET series provides established reliability in industrial applications.
IRF7853TRPBF (Infineon): Rated for 8.3A continuous drain current with 18 mOhm Rds On, offering superior current handling and lower on-state resistance. Recommended for designs requiring enhanced thermal performance.
SI4056DY-T1-GE3 (Vishay Siliconix): Rated for 11.1A continuous drain current with 23 mOhm Rds On. Provides highest current capacity and lowest input capacitance (900 pF). Suitable for high-current switching applications requiring minimal gate drive power.

All substitute parts are ROHS3 compliant, carry MSL 1 rating, and operate across the full -55°C to 150°C temperature range. Selection among secondary substitutes depends on specific application requirements for current margin, gate charge, and thermal dissipation characteristics.

Frequently Asked Questions (FAQ)

Q: Can the AO4292E be used as a direct replacement for the AO4292?

A: Yes. The AO4292E is the active production equivalent of the obsolete AO4292. Both parts share identical electrical specifications, gate-source voltage ratings, and 8-SOIC package configuration. No circuit modifications are required for substitution.

Q: What is the primary reason for substituting the AO4292?

A: The AO4292 is classified as obsolete. Substitution is necessary to ensure continued design support, production availability, and compliance with current manufacturing standards. The AO4292E provides seamless replacement with active product status.

Q: Are all listed substitute parts compatible with existing AO4292 PCB layouts?

A: All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Pin configurations are compatible for direct PCB footprint replacement. However, IRF7495TRPBF and IRF7853TRPBF use 8-SO packaging, which may require footprint verification despite dimensional similarity to 8-SOIC.

Q: What is the significance of the 100V Vdss rating in substitution?

A: The 100V Vdss rating defines the maximum drain-to-source voltage the MOSFET can withstand. All substitute parts maintain this 100V rating, ensuring compatibility with circuits designed for the AO4292. Substitutes with higher Vdss ratings are acceptable; lower ratings are not.

Q: How does continuous drain current (Id) affect substitution suitability?

A: The AO4292 is rated for 8A continuous drain current at 25°C. Substitute parts with equal or higher Id ratings (8A or greater) provide full compatibility. Parts with lower Id ratings (FDS3672 at 7.5A, FDS86141 at 7A, IRF7495TRPBF at 7.3A) are acceptable only if circuit design margins accommodate reduced current capacity.

Q: What role does on-state resistance (Rds On) play in substitution?

A: Rds On determines power dissipation and thermal performance. The AO4292 specifies 23 mOhm maximum at 8A and 10V gate-source voltage. Substitute parts with equal or lower Rds On values maintain or improve thermal characteristics. IRF7853TRPBF (18 mOhm) and SI4056DY-T1-GE3 (23 mOhm) provide superior or equivalent performance.

Q: Is gate charge (Qg) a critical parameter for substitution?

A: Gate charge affects gate drive circuit requirements and switching speed. The AO4292 specifies 25 nC at 10V. Variations in gate charge among substitutes (ranging from 16.5 nC to 51 nC) are acceptable provided the gate drive circuit can supply sufficient current. Lower gate charge reduces drive power requirements; higher gate charge may require circuit optimization.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts carry MSL 1 rating, ensuring consistent handling procedures and eliminating moisture-related reliability concerns.

Q: Are there differences in operating temperature range among substitute parts?

A: No. All substitute parts, including the AO4292, operate across the identical temperature range of -55°C to 150°C (junction temperature). Temperature performance is equivalent across all options.

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

A: Ta (ambient temperature) represents power dissipation under standard ambient conditions. Tc (case temperature) represents dissipation measured at the component case. SI4056DY-T1-GE3 specifies both: 2.5W (Ta) and 5.7W (Tc), indicating enhanced thermal performance when case temperature is controlled. Other parts specify Ta only.

Q: Why do some substitute parts have higher input capacitance (Ciss)?

A: Input capacitance affects gate drive circuit performance and switching characteristics. The AO4292 specifies 1190 pF at 50V. Substitutes with higher Ciss (such as FDS3672 at 2015 pF and IRF7853TRPBF at 1640 pF) require slightly higher gate drive current but remain compatible with standard gate drive circuits. SI4056DY-T1-GE3 offers lower Ciss (900 pF), reducing gate drive requirements.

Q: Is ROHS3 compliance required for substitution?

A: ROHS3 compliance is not a substitution requirement but indicates adherence to current environmental and manufacturing standards. All active substitute parts are ROHS3 compliant. The obsolete AO4292 does not carry this certification, making ROHS3-compliant substitutes preferable for new designs and production continuity.

Q: Can I substitute an IRF7853TRPBF for an AO4292 in a current-limited application?

A: Yes. The IRF7853TRPBF is rated for 8.3A continuous drain current, exceeding the AO4292's 8A rating. Its lower on-state resistance (18 mOhm versus 23 mOhm) provides improved thermal performance. The 8-SO package is dimensionally compatible with 8-SOIC footprints for direct replacement.

Q: What advantage does SI4056DY-T1-GE3 offer over other substitutes?

A: The SI4056DY-T1-GE3 provides the highest continuous drain current rating (11.1A) and lowest input capacitance (900 pF) among all substitutes. These characteristics make it suitable for high-current switching applications and circuits requiring minimal gate drive power. Its 23 mOhm Rds On matches the AO4292 specification.

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