AO7412 MOSFET N-Channel 30V 1.7A Equivalent & Substitute Parts

Part Overview

The AO7412 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 1.7A continuous drain current at 25°C. The device is housed in a 6-pin SC-70-6 (SC-88, SOT-363) surface mount package and dissipates a maximum of 350mW. The AO7412 maintains Active product status and is suitable for new designs.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical parameters of alternative devices. The parts listed in this reference have been qualified as direct substitutes based on matching or exceeding the critical electrical specifications and package compatibility of the AO7412.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	1.7	A
Rds On (Max) @ Id, Vgs	90 mOhm @ 2.1A, 10V	—
Vgs(th) (Max) @ Id	1.8	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	3.6	nC @ 4.5V
Power Dissipation (Max)	350	mW
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	6-TSSOP, SC-88, SOT-363	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AO7412 is determined by the following critical parameters:

Electrical Compatibility Criteria:

FET Type: N-Channel topology must be maintained
Drain to Source Voltage (Vdss): Substitute must equal or exceed 30V
Continuous Drain Current (Id): Substitute must equal or exceed 1.7A at 25°C
Power Dissipation: Substitute must equal or exceed 350mW
Operating Temperature Range: Substitute must cover -55°C to 150°C (TJ)
Gate Charge (Qg): Lower values indicate faster switching; values up to the specified maximum are acceptable
Rds On: Lower on-resistance values are acceptable; higher values may impact thermal performance

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount required
Package / Case: 6-TSSOP, SC-88, or SOT-363 packages are compatible

Substitutes are grouped based on whether they meet all electrical requirements while maintaining package compatibility. Parts that do not meet the minimum Vdss or Id specifications are not qualified as direct substitutes.

Parameter Comparison

Parameter	AO7412 (Main)	AO7400 (Substitute)	FDG311N (Substitute)
Manufacturer	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	Fairchild Semiconductor
FET Type	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	30 V	30 V	20 V
Continuous Drain Current (Id) @ 25°C	1.7 A	1.7 A	1.9 A
Rds On (Max) @ Id, Vgs	90 mOhm @ 2.1A, 10V	85 mOhm @ 1.5A, 10V	115 mOhm @ 1.9A, 4.5V
Vgs(th) (Max) @ Id	1.8 V @ 250µA	1.4 V @ 250µA	1.5 V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	3.6 nC @ 4.5V	4.82 nC @ 4.5V	4.5 nC @ 4.5V
Input Capacitance (Ciss) (Max) @ Vds	270 pF @ 15V	390 pF @ 15V	270 pF @ 10V
Power Dissipation (Max)	350 mW	350 mW	750 mW
Operating Temperature Range	-55 to 150 °C (TJ)	-55 to 150 °C (TJ)	-55 to 150 °C (TJ)
Package / Case	6-TSSOP, SC-88, SOT-363	SC-70, SOT-323	6-TSSOP, SC-88, SOT-363
Product Status	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AO7400 Substitution: The AO7400 is a manufacturer-recommended substitute from Alpha & Omega Semiconductor Inc. It matches the AO7412 in Vdss (30V), Id (1.7A), and power dissipation (350mW). The AO7400 features lower on-resistance (85 mOhm vs. 90 mOhm) and lower gate threshold voltage (1.4V vs. 1.8V), indicating improved switching characteristics. However, the AO7400 carries a "Not For New Designs" product status, indicating it is in mature or declining production phase. The AO7400 is packaged in SC-70-3 (SOT-323), which differs from the AO7412's SC-70-6 package. This package difference requires PCB layout modification and is not a direct pin-for-pin replacement. The AO7400 is suitable for legacy design support or when supply of the AO7412 is unavailable and design revision is permissible.

FDG311N Substitution: The FDG311N is manufactured by Fairchild Semiconductor and is rated for 20V Vdss, which is 10V lower than the AO7412's 30V specification. The FDG311N exceeds the AO7412 in continuous drain current (1.9A vs. 1.7A) and power dissipation (750mW vs. 350mW). The FDG311N is housed in SC-88 (SC-70-6) package, which is pin-compatible with the AO7412. The FDG311N maintains Active product status and ROHS3 compliance. The reduced Vdss rating of the FDG311N restricts its use to applications where the maximum operating voltage does not exceed 20V. The FDG311N is suitable as a substitute only when circuit design permits operation at 20V maximum drain-to-source voltage.

Frequently Asked Questions (FAQ)

Q: Can the AO7400 be used as a direct pin-for-pin replacement for the AO7412?

A: No. The AO7400 uses SC-70-3 (SOT-323) packaging, while the AO7412 uses SC-70-6 (SC-88, SOT-363) packaging. These packages have different pin counts and layouts. PCB redesign is required for substitution.

Q: What is the primary limitation of the FDG311N as a substitute for the AO7412?

A: The FDG311N is rated for a maximum drain-to-source voltage of 20V, compared to the AO7412's 30V rating. Substitution is limited to applications where the circuit operates at 20V or below. Applications requiring 30V operation cannot use the FDG311N.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the AO7400 and FDG311N are ROHS3 compliant, matching the AO7412's compliance status.

Q: Does the AO7400's lower gate threshold voltage (1.4V vs. 1.8V) affect circuit operation?

A: The lower gate threshold voltage of the AO7400 indicates it requires less gate voltage to begin conducting. This may affect gate drive circuit design and switching timing. Circuit simulation or testing is necessary to confirm compatibility with existing gate drive circuitry.

Q: Why is the AO7400 marked "Not For New Designs"?

A: This designation indicates the AO7400 is in a mature production phase and may have limited availability or planned discontinuation. New designs should prioritize the AO7412 (Active status) or evaluate the FDG311N (Active status) if voltage requirements permit.

Q: Can the FDG311N be used in a 30V application if the circuit rarely reaches maximum voltage?

A: No. Component selection must be based on the maximum voltage the circuit will experience, not typical operating conditions. The FDG311N's 20V Vdss rating is an absolute maximum rating and must not be exceeded.

Q: What is the significance of the higher input capacitance (Ciss) of the AO7400 compared to the AO7412?

A: The AO7400 has 390 pF input capacitance at 15V, compared to the AO7412's 270 pF at 15V. Higher input capacitance increases gate charge requirements and may affect switching speed and gate drive power consumption. Gate drive circuit design should account for this difference.

Q: Are the AO7412 and FDG311N pin-compatible?

A: Yes. Both devices use the 6-TSSOP, SC-88, SOT-363 package format, making them pin-compatible. However, the FDG311N's lower Vdss rating (20V vs. 30V) restricts its use to applications operating at 20V or below.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message