AO4411 MOSFET P-Channel 30V 8A Equivalent & Substitute Parts

Part Overview

The AO4411 is a P-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 8A continuous drain current in an 8-SOIC surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where the AO4411 is currently deployed.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	8	A
Rds On (Max) @ Id, Vgs	32 mOhm @ 8A, 10V	—
Vgs(th) (Max) @ Id	2.4	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	16	nC @ 10V
Power Dissipation (Max)	3.1	W (Ta)
Operating Temperature Range	-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 AO4411 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

FET Type: P-Channel (required)
Drain to Source Voltage (Vdss): 30V (required)
Package / Case: 8-SOIC form factor (required for PCB compatibility)
Mounting Type: Surface Mount (required)
Operating Temperature Range: -55°C to 150°C (required)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)

Functional Compatibility Parameters:

Continuous Drain Current (Id): Minimum 8A at 25°C (required for circuit operation)
Rds On (Max): 32 mOhm or lower at specified conditions (required for thermal and efficiency performance)
Gate Charge (Qg): Comparable values to ensure drive circuit compatibility
Vgs(th): Within ±20V gate voltage specification range

Substitute parts are grouped based on whether they meet or exceed the AO4411 specifications in these critical areas. Parts with lower current ratings, higher on-resistance, or incompatible packages are excluded from substitution consideration.

Parameter Comparison

Parameter	AO4411	AOSP21313C	DMP3037LSS-13	SI4431BDY-T1-GE3	SI4431CDY-T1-GE3	SI4435DYTRPBF	STS6P3LLH6
Manufacturer	Alpha & Omega	Alpha & Omega	Diodes Inc.	Vishay Siliconix	Vishay Siliconix	Infineon	STMicroelectronics
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss (V)	30	30	30	30	30	30	30
Id @ 25°C (A)	8	7	5.8	5.7	9	8	6
Rds On (Max) (mOhm)	32 @ 8A, 10V	32 @ 7A, 10V	32 @ 7A, 10V	30 @ 7.5A, 10V	32 @ 7A, 10V	20 @ 8A, 10V	30 @ 3A, 10V
Vgs(th) (V)	2.4 @ 250µA	2.2 @ 250µA	2.4 @ 250µA	3 @ 250µA	2.5 @ 250µA	1 @ 250µA	1 @ 250µA (Min)
Qg (nC)	16 @ 10V	33 @ 10V	19.3 @ 10V	20 @ 5V	38 @ 10V	60 @ 10V	12 @ 4.5V
Ciss (pF)	760 @ 15V	1100 @ 15V	931 @ 15V	—	1006 @ 15V	2320 @ 15V	1450 @ 24V
Power Dissipation (W)	3.1 (Ta)	2.5 (Ta)	1.2 (Ta)	1.5 (Ta)	2.5 (Ta) / 4.2 (Tc)	2.5 (Ta)	2.7 (Ta)
Operating Temp (°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-SOIC	8-SOIC	8-SOIC
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SI4431CDY-T1-GE3 (Vishay Siliconix) is the preferred substitute. This device exceeds the AO4411 current rating at 9A continuous drain current, maintains 30V Vdss, and is housed in the identical 8-SOIC package. The part is in Active product status with full RoHS3 compliance and REACH unaffected designation. Power dissipation is rated at 2.5W (Ta), meeting thermal requirements. Gate charge of 38 nC is higher than the AO4411 but remains within acceptable drive circuit parameters.

SI4435DYTRPBF (Infineon Technologies) provides direct current matching at 8A with superior on-resistance performance (20 mOhm versus 32 mOhm). The 8-SOIC package is mechanically identical. This part is Active status with full compliance certifications. Higher gate charge (60 nC) and input capacitance (2320 pF) require verification of drive circuit capability but do not preclude substitution.

Secondary Substitutes (Reduced Current Rating):

AOSP21313C (Alpha & Omega Semiconductor Inc.) is a manufacturer-recommended substitute with 7A continuous drain current, representing a 12.5% reduction from the AO4411 specification. This part is Active status and maintains identical electrical characteristics (32 mOhm Rds On, 30V Vdss, 8-SOIC package). Substitution is valid for applications where the 7A rating is sufficient.

STS6P3LLH6 (STMicroelectronics) provides 6A continuous drain current with 30 mOhm on-resistance and is Active status. The 8-SOIC package is compatible. Lower gate charge (12 nC) and reduced input capacitance (1450 pF) may improve drive circuit efficiency. Substitution is valid for applications with 6A or lower current requirements.

Tertiary Substitutes (Marginal Current Rating):

DMP3037LSS-13 (Diodes Incorporated) and SI4431BDY-T1-GE3 (Vishay Siliconix) both provide continuous drain currents below 6A. These parts are suitable only for applications where the AO4411 is operated at reduced current levels or where thermal margin is not critical. Both are Active status with full compliance.

Substitution Constraints:

All substitute parts maintain the required 30V Vdss, 8-SOIC package form factor, -55°C to 150°C operating temperature range, and RoHS3 compliance. Substitution decisions must account for:

Actual circuit current requirements relative to each substitute's continuous drain rating
Drive circuit capability to handle varying gate charge values
Thermal design margin based on power dissipation specifications
PCB layout compatibility with 8-SOIC pinout

Frequently Asked Questions (FAQ)

Q: Can SI4431CDY-T1-GE3 be used as a direct replacement for AO4411 without circuit modification?

A: SI4431CDY-T1-GE3 is mechanically and electrically compatible with AO4411 in the 8-SOIC package. The 9A current rating exceeds the AO4411 specification, and all voltage parameters (30V Vdss, ±20V Vgs) are identical. Gate charge is higher (38 nC versus 16 nC), which may require verification that the drive circuit can supply adequate current within acceptable timing windows. No other circuit modifications are required.

Q: Why does SI4435DYTRPBF have lower on-resistance (20 mOhm) than AO4411 (32 mOhm)?

A: On-resistance values are measured at specific current and gate voltage conditions. SI4435DYTRPBF achieves 20 mOhm at 8A and 10V gate voltage, while AO4411 is specified at 32 mOhm under the same conditions. Lower on-resistance reduces power dissipation and heat generation. This is a performance advantage and does not affect substitution compatibility.

Q: Is AOSP21313C acceptable if the circuit only requires 7A instead of 8A?

A: Yes. AOSP21313C is rated for 7A continuous drain current and is suitable for applications where the circuit operates at or below this current level. The part is manufacturer-recommended and maintains all other critical parameters (30V Vdss, 32 mOhm Rds On, 8-SOIC package, -55°C to 150°C operating range). Verify that the actual circuit current demand does not exceed 7A under worst-case conditions.

Q: What is the significance of different gate charge values among the substitute parts?

A: Gate charge (Qg) determines the amount of charge required to switch the MOSFET from off to on state. Higher gate charge requires more current from the drive circuit and increases switching time. AO4411 has 16 nC gate charge, while substitutes range from 12 nC (STS6P3LLH6) to 60 nC (SI4435DYTRPBF). Verify that the drive circuit can supply sufficient current to charge the gate within the required switching time window. Higher gate charge does not prevent substitution but requires drive circuit validation.

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

A: Yes. All substitute parts listed are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages. PCB footprints and pinouts are identical, allowing direct mechanical substitution without layout changes.

Q: Why is DMP3037LSS-13 listed as a substitute if it only provides 5.8A?

A: DMP3037LSS-13 is included because it meets all critical electrical and mechanical parameters (30V Vdss, 8-SOIC package, -55°C to 150°C operating range, RoHS3 compliance). The 5.8A continuous drain current is lower than AO4411, making it suitable only for applications where the circuit operates at reduced current levels. It is not a direct replacement for full 8A operation but is a valid substitute for current-limited applications.

Q: What does "Active" product status mean compared to "Not For New Designs"?

A: "Active" status indicates the manufacturer continues production and provides full technical support. "Not For New Designs" indicates the AO4411 has reached end-of-life and is no longer recommended for new circuit designs, though existing inventory may remain available. All substitute parts listed are Active status, ensuring long-term availability and manufacturer support.

Q: Can I use SI4431BDY-T1-GE3 if my circuit requires 8A continuous current?

A: SI4431BDY-T1-GE3 is rated for 5.7A continuous drain current, which is below the 8A requirement. Using this part in an 8A application would exceed its continuous current rating and result in excessive heat generation and potential device failure. This part is not suitable for full 8A operation and should be used only in applications with 5.7A or lower current demand.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the AO4411 regulatory status. This ensures compatibility with environmental and regulatory requirements for electronics manufacturing and distribution.

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