AO7404 N-Channel MOSFET 20V 1A SC70-3 Equivalent & Substitute Parts

Part Overview

The AO7404 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 20V drain-to-source voltage with 1A continuous drain current in a surface mount SC-70-3 package. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -55°C to 150°C and dissipates a maximum of 350mW.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	1	A
Rds On (Max) @ Id, Vgs	225 mOhm @ 1A, 4.5V	—
Power Dissipation (Max)	350	mW
Operating Temperature Range	-55 to 150	°C
Package Type	SC-70, SOT-323	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AO7404 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

FET Type: N-Channel topology
Drain to Source Voltage (Vdss): Minimum 20V rating required
Package Type: SC-70 or SOT-323 surface mount packages
Mounting Type: Surface mount configuration
Operating Temperature Range: -55°C to 150°C minimum

Performance Criteria:

Continuous Drain Current (Id): Equal to or greater than 1A
On-State Resistance (Rds On): Lower values indicate improved performance
Power Dissipation: Adequate thermal handling capability

The substitute parts listed below meet or exceed the mandatory compatibility criteria and provide equivalent or superior electrical performance within the same package family.

Parameter Comparison

Parameter	AO7404 (Main Part)	BSS816NWH6327XTSA1	PMF250XNEX
Manufacturer	Alpha & Omega Semiconductor Inc.	Infineon Technologies	Nexperia USA Inc.
FET Type	N-Channel	N-Channel	N-Channel
Vdss (V)	20	20	30
Id @ 25°C (A)	1	1.4	1
Rds On (Max) @ Vgs (mOhm)	225 @ 4.5V	160 @ 2.5V	254 @ 4.5V
Power Dissipation (Max) (mW)	350	500	342
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150
Package	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BSS816NWH6327XTSA1 (Infineon Technologies)

This substitute provides direct functional equivalence to the AO7404. The device maintains the 20V Vdss rating and exceeds the 1A current requirement at 1.4A continuous drain current. The on-state resistance is improved at 160 mOhm versus 225 mOhm, resulting in lower power dissipation during operation. The part is actively manufactured and carries ROHS3 compliance certification. The OptiMOS™ series designation indicates optimized performance characteristics for modern applications.

PMF250XNEX (Nexperia USA Inc.)

This substitute offers a higher voltage rating of 30V Vdss, providing additional design margin beyond the 20V requirement of the AO7404. The device maintains 1A continuous drain current matching the original specification. The on-state resistance of 254 mOhm is comparable to the original part. This device is actively manufactured with ROHS3 compliance. The elevated voltage rating makes this option suitable for applications requiring enhanced voltage headroom or where circuit topology may benefit from higher voltage capability.

Both substitute parts are actively produced, carry appropriate compliance certifications, and are available in equivalent surface mount packages. Selection between them depends on whether the application benefits from the improved performance characteristics of the BSS816NWH6327XTSA1 or the additional voltage margin provided by the PMF250XNEX.

Frequently Asked Questions (FAQ)

Q: Can the BSS816NWH6327XTSA1 directly replace the AO7404 in existing designs?

A: Yes. Both devices are N-Channel MOSFETs with identical 20V Vdss ratings, compatible SC-70/SOT-323 packages, and matching operating temperature ranges. The BSS816NWH6327XTSA1 provides superior on-state resistance and higher current capability, making it a direct functional upgrade.

Q: What is the primary advantage of the PMF250XNEX over the AO7404?

A: The PMF250XNEX provides a 30V Vdss rating compared to the 20V rating of the AO7404. This higher voltage rating offers additional design margin and may be beneficial in applications where voltage transients or circuit topology require enhanced voltage headroom.

Q: Are both substitute parts available in the same package as the original AO7404?

A: Yes. Both the BSS816NWH6327XTSA1 and PMF250XNEX are supplied in SC-70 and SOT-323 surface mount packages, matching the original AO7404 package configuration.

Q: What compliance certifications do the substitute parts carry?

A: Both substitute parts are ROHS3 compliant and carry REACH Unaffected status, matching the environmental and regulatory requirements of modern manufacturing standards.

Q: Why is the AO7404 classified as obsolete?

A: The AO7404 is no longer in active production. The substitute parts listed represent actively manufactured alternatives that meet or exceed the electrical and mechanical specifications of the original device.

Q: Can I use the PMF250XNEX in a circuit designed for the AO7404 without modification?

A: Yes. The PMF250XNEX is pin-compatible and functionally equivalent. The higher 30V Vdss rating is backward compatible with 20V applications. No circuit modifications are required for direct substitution.

Q: How do the on-state resistance values compare between the three devices?

A: The BSS816NWH6327XTSA1 offers the lowest on-state resistance at 160 mOhm, resulting in reduced power dissipation. The AO7404 and PMF250XNEX have comparable on-state resistance values at 225 mOhm and 254 mOhm respectively, with minimal practical difference in most applications.

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