AO4423 MOSFET P-Channel 30V 17A Equivalent & Substitute Parts

Part Overview

The AO4423 is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 17A continuous drain current at 25°C. The device is packaged in an 8-SOIC surface mount configuration with a maximum power dissipation of 3.1W and operates across the temperature range of -55°C to 150°C (TJ).

The AO4423 is classified as an obsolete product. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this MOSFET topology.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	17	A (Ta)
Rds On (Max) @ Id, Vgs	6.2	mOhm @ 15A, 20V
Vgs(th) (Max) @ Id	2.6	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	57	nC @ 10V
Vgs (Max)	±25	V
Input Capacitance (Ciss) (Max) @ Vds	3033	pF @ 15V
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)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AO4423 MOSFET is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

FET Type: P-Channel topology
Drain to Source Voltage (Vdss): 30V minimum rating
Mounting Type: Surface Mount
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Operating Temperature Range: -55°C to 150°C (TJ)
RoHS Compliance: ROHS3 Compliant

Performance Parameters for Functional Equivalence:

Current - Continuous Drain (Id) @ 25°C: 13A to 17A range
Rds On (Max): 6.2mOhm to 9.3mOhm
Vgs(th) (Max): 2.3V to 3V
Gate Charge (Qg): 57nC to 150nC
Input Capacitance (Ciss): 2830pF to 8000pF
Power Dissipation (Max): 650mW to 3.1W
Vgs (Max): ±20V to ±25V

All substitute parts listed meet the core electrical and mechanical requirements for direct substitution in applications designed for the AO4423.

Parameter Comparison

Parameter	AO4423	AOSP21357	FDS6673BZ	FDS6679AZ	RRH140P03GZETB
Manufacturer	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	onsemi	onsemi	Rohm Semiconductor
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss	30V	30V	30V	30V	30V
Id @ 25°C	17A	16A	14.5A	13A	14A
Rds On (Max) @ Id, Vgs	6.2mOhm @ 15A, 20V	8.5mOhm @ 16A, 10V	7.8mOhm @ 14.5A, 10V	9.3mOhm @ 13A, 10V	7mOhm @ 14A, 10V
Vgs(th) (Max) @ Id	2.6V @ 250µA	2.3V @ 250µA	3V @ 250µA	3V @ 250µA	2.5V @ 1mA
Gate Charge (Qg) (Max) @ Vgs	57nC @ 10V	70nC @ 10V	124nC @ 10V	96nC @ 10V	150nC @ 10V
Vgs (Max)	±25V	±25V	±25V	±25V	±20V
Input Capacitance (Ciss) (Max) @ Vds	3033pF @ 15V	2830pF @ 15V	4700pF @ 15V	3845pF @ 15V	8000pF @ 10V
Power Dissipation (Max)	3.1W	3.1W	2.5W	2.5W	650mW
Operating Temperature	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

AOSP21357 (Alpha & Omega Semiconductor Inc.)

The AOSP21357 is an Active product from the same manufacturer as the AO4423. It provides the closest electrical performance match with 16A continuous drain current, matching the 3.1W power dissipation specification. The AOSP21357 maintains full ROHS3 compliance and MSL 1 rating. This part is recommended as the primary substitute for direct replacement in existing designs.

FDS6673BZ (onsemi PowerTrench® Series)

The FDS6673BZ is an Active product offering 14.5A continuous drain current with 7.8mOhm Rds On specification. The part maintains full ROHS3 compliance and MSL 1 rating. The FDS6673BZ is suitable for applications where the 14.5A current rating is acceptable within design margins.

FDS6679AZ (onsemi PowerTrench® Series)

The FDS6679AZ is an Active product offering 13A continuous drain current with 9.3mOhm Rds On specification. The part maintains full ROHS3 compliance and MSL 1 rating. The FDS6679AZ is suitable for applications where the 13A current rating is acceptable within design margins.

RRH140P03GZETB (Rohm Semiconductor)

The RRH140P03GZETB is classified as Not For New Designs. While it meets the 30V Vdss and 14A current specifications, its product status restricts its use to legacy support only. The part exhibits lower power dissipation (650mW) and higher gate charge (150nC) compared to the AO4423. This part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can the AOSP21357 be used as a direct replacement for the AO4423?

A: Yes. The AOSP21357 meets all critical substitution parameters: P-Channel topology, 30V Vdss rating, 8-SOIC package, -55°C to 150°C operating temperature range, and ROHS3 compliance. The 16A continuous drain current and 3.1W power dissipation match the AO4423 specifications. The AOSP21357 is an Active product from the same manufacturer.

Q: What is the difference between the onsemi FDS6673BZ and FDS6679AZ?

A: Both parts are onsemi PowerTrench® series P-Channel MOSFETs rated for 30V Vdss. The FDS6673BZ provides 14.5A continuous drain current with 7.8mOhm Rds On, while the FDS6679AZ provides 13A continuous drain current with 9.3mOhm Rds On. Both maintain identical operating temperature range, ROHS3 compliance, and MSL 1 rating. Selection depends on application current requirements.

Q: Why is the RRH140P03GZETB marked as Not For New Designs?

A: The RRH140P03GZETB is classified as Not For New Designs by Rohm Semiconductor. While it meets the core electrical specifications (30V Vdss, 14A Id), its product status restricts its use to legacy applications only. New designs should utilize Active products such as AOSP21357, FDS6673BZ, or FDS6679AZ.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration, ensuring mechanical compatibility with existing PCB layouts designed for the AO4423.

Q: What is the significance of the gate charge (Qg) parameter in substitution?

A: Gate charge affects switching speed and driver circuit requirements. The AO4423 specifies 57nC @ 10V. Substitute parts range from 70nC to 150nC. Higher gate charge values require longer switching times and may impact circuit performance in high-frequency applications. The AOSP21357 (70nC) provides the closest match to the original specification.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All substitute parts listed are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance of the AO4423.

Q: What is the impact of Rds On variation among substitute parts?

A: Rds On (on-resistance) directly affects power dissipation and thermal performance. The AO4423 specifies 6.2mOhm @ 15A, 20V. Substitute parts range from 7mOhm to 9.3mOhm. Higher Rds On values result in increased power dissipation at equivalent current levels. Applications with tight thermal budgets should prioritize parts with lower Rds On specifications.

Q: Can the substitute parts handle the full 17A rating of the AO4423?

A: The AOSP21357 is rated for 16A continuous drain current, which approaches the AO4423 specification. The FDS6673BZ (14.5A) and FDS6679AZ (13A) have lower current ratings. Applications requiring the full 17A specification should use the AOSP21357 or verify that design margins accommodate the reduced current ratings of alternative parts.

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