AO4433 MOSFET P-Channel 30V 11A Equivalent & Substitute Parts

Part Overview

The AO4433 is a P-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 11A continuous drain current at 25°C. The device is housed in an 8-SOIC surface mount package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing production, maintenance, and new design implementations where P-Channel MOSFET functionality at 30V is required.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	11	A
Rds(on) Max @ Id, Vgs	14 mOhm @ 11A, 20V	—
Gate Threshold Voltage (Vgs(th)) Max	3.5	V @ 250µA
Power Dissipation (Max)	3	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-SOIC	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AO4433 is determined by the following critical parameters:

Primary Substitution Criteria:

FET Type: P-Channel (required)
Drain-to-Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 11A or greater
Package: 8-SOIC or equivalent surface mount package
Operating Temperature Range: -55°C to 150°C minimum
Rds(on) performance: 14 mOhm or lower at rated conditions

Secondary Compatibility Factors:

Gate Threshold Voltage (Vgs(th)): 3.5V or lower
Power Dissipation: 3W or greater
Moisture Sensitivity Level: 1 (Unlimited)
RoHS3 Compliance and REACH Unaffected status

Substitute parts are grouped into two categories:

Category A – Direct P-Channel Replacements (Same Channel Type): Parts maintaining P-Channel topology with equivalent or superior electrical performance at 30V and 11A or higher current ratings.

Category B – Alternative Channel Type (N-Channel): The AO4468 (N-Channel) is listed as a manufacturer-recommended substitute despite channel type difference. This substitution applies only to circuit topologies where N-Channel operation is functionally equivalent.

Parameter Comparison

Part Number	Manufacturer	FET Type	Vdss (V)	Id @ 25°C (A)	Rds(on) Max (mOhm)	Vgs(th) Max (V)	Power Diss. (W)	Package	Product Status
AO4433	Alpha & Omega	P-Channel	30	11	14 @ 11A, 20V	3.5 @ 250µA	3	8-SOIC	Obsolete
FDS6681Z	onsemi	P-Channel	30	20	4.6 @ 20A, 10V	3 @ 250µA	2.5	8-SOIC	Active
FDS4435BZ	onsemi	P-Channel	30	8.8	20 @ 8.8A, 10V	3 @ 250µA	2.5	8-SOIC	Active
NTMS4177PR2G	onsemi	P-Channel	30	6.6	12 @ 11.4A, 10V	2.5 @ 250µA	0.84	8-SOIC	Active
SQ4425EY-T1_GE3	Vishay Siliconix	P-Channel	30	18	12 @ 13A, 10V	2.5 @ 250µA	6.8	8-SOIC	Active
RRH100P03GZETB	Rohm Semiconductor	P-Channel	30	10	12.6 @ 10A, 10V	2.5 @ 1mA	0.65	8-SOP	Not For New Designs
RSS090P03TB	Rohm Semiconductor	P-Channel	30	9	14 @ 9A, 10V	2.5 @ 1mA	2	8-SOP	Active
RRH090P03GZETB	Rohm Semiconductor	P-Channel	30	9	15.4 @ 9A, 10V	2.5 @ 1mA	0.65	8-SOP	Not For New Designs
AO4468	Alpha & Omega	N-Channel	30	10.5	14 @ 11.6A, 10V	3 @ 250µA	3.1	8-SOIC	Not For New Designs

Engineering Selection Recommendations

For Active Production and New Designs:

FDS6681Z (onsemi) is the primary recommended substitute. This part exceeds the AO4433 specifications with 20A continuous drain current, maintains 30V Vdss rating, and achieves superior Rds(on) performance of 4.6 mOhm at 20A. The device is Active status, RoHS3 compliant, and housed in the identical 8-SOIC package. Higher power dissipation rating (2.5W) accommodates thermal margin.

SQ4425EY-T1_GE3 (Vishay Siliconix) provides an alternative with 18A current rating and automotive-grade qualification (AEC-Q101). This part is Active status, RoHS3 compliant, and rated to 175°C junction temperature, exceeding the AO4433 operating range. The 8-SOIC package ensures direct footprint compatibility.

RSS090P03TB (Rohm Semiconductor) is suitable for applications where current requirements are lower (9A). This part is Active status, RoHS3 compliant, and provides Rds(on) matching at 14 mOhm. Package is 8-SOP, which maintains 0.154" width and 3.90mm footprint compatibility with 8-SOIC.

For Legacy System Maintenance:

RRH100P03GZETB (Rohm Semiconductor) provides 10A current capability with 12.6 mOhm Rds(on) performance. Although classified as Not For New Designs, this part maintains compatibility with existing designs. 8-SOP package is mechanically compatible with 8-SOIC footprints.

Not Recommended for New Designs:

AO4468 is listed as a manufacturer-recommended substitute but is classified as Not For New Designs. This N-Channel device requires circuit topology modification and is not suitable for direct replacement in P-Channel applications.

NTMS4177PR2G and RRH090P03GZETB have reduced current ratings (6.6A and 9A respectively) and lower power dissipation, making them unsuitable for applications requiring the full 11A capability of the AO4433.

Frequently Asked Questions (FAQ)

Q: Can the AO4433 be directly replaced with the AO4468?

A: The AO4468 is an N-Channel device, whereas the AO4433 is P-Channel. Direct replacement requires circuit topology modification. The AO4468 is listed as a manufacturer-recommended substitute only for applications where N-Channel operation is functionally equivalent. For standard P-Channel applications, use FDS6681Z or SQ4425EY-T1_GE3.

Q: What is the difference between 8-SOIC and 8-SOP packages?

A: Both packages are surface mount with identical 0.154" width and 3.90mm footprint dimensions. The primary difference is in lead geometry and solder joint formation. Parts in 8-SOP packages (such as RSS090P03TB and RRH100P03GZETB) are mechanically compatible with 8-SOIC PCB layouts, though verification with your assembly partner is recommended.

Q: Why is FDS6681Z recommended over other substitutes?

A: FDS6681Z exceeds the AO4433 specifications in all critical parameters: 20A continuous drain current (versus 11A), superior Rds(on) of 4.6 mOhm, Active product status, RoHS3 compliance, and identical 8-SOIC package. The device provides performance headroom and long-term availability assurance.

Q: Are Rohm Semiconductor parts suitable for new designs?

A: RSS090P03TB is Active status and suitable for new designs. RRH100P03GZETB and RRH090P03GZETB are classified as Not For New Designs and should be used only for legacy system maintenance or repair.

Q: What is the significance of the Vgs(th) difference between AO4433 and substitute parts?

A: The AO4433 has Vgs(th) of 3.5V at 250µA, while most substitutes specify 2.5V to 3V. Lower threshold voltage improves gate drive efficiency and reduces switching losses. This difference is not a compatibility issue; lower Vgs(th) is a performance advantage in most applications.

Q: Does the AO4433 require specific gate drive voltage?

A: The AO4433 specifies drive voltages of 5V (Min Rds On) and 20V (Max Rds On). Substitute parts specify 4.5V to 10V drive voltage ranges. Verify your gate drive circuit operates within the specified range of your selected substitute part.

Q: What is the impact of power dissipation differences?

A: The AO4433 is rated for 3W power dissipation. FDS6681Z is rated for 2.5W, while SQ4425EY-T1_GE3 is rated for 6.8W. Higher power dissipation rating provides thermal margin. Lower ratings require verification that your application does not exceed the specified power envelope.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts are RoHS3 compliant. The AO4433 does not specify RoHS status. Verify RoHS compliance requirements for your application before final part selection.

Q: Can NTMS4177PR2G be used as a substitute?

A: NTMS4177PR2G has a continuous drain current rating of only 6.6A, which is below the AO4433 specification of 11A. This part is suitable only for applications with reduced current requirements and is not a direct substitute for the full-rated AO4433 functionality.

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