AO4413 P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AO4413 is a P-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 15A continuous drain current at 25°C. The device is housed in an 8-SOIC surface mount package and is designed for general-purpose switching and amplification applications requiring moderate current handling in compact form factors.

The AO4413 is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or redesign initiatives.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	15	A
Rds On (Max) @ Id, Vgs	7 mOhm @ 15A, 20V	—
Vgs(th) (Max) @ Id	3.5	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	61	nC @ 10V
Power Dissipation (Max)	3.1	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	8-SOIC	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AO4413 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

FET Type: P-Channel (mandatory)
Drain to Source Voltage (Vdss): 30V (exact match required)
Continuous Drain Current (Id): 15A or greater
Package Type: 8-SOIC surface mount (mechanical compatibility)
Operating Temperature Range: -55°C to 150°C (functional compatibility)
RoHS3 Compliance: Required for regulatory alignment

Secondary Compatibility Parameters:

Rds On (Max): 7 mOhm or lower (on-state resistance)
Vgs(th) (Max): Threshold voltage within ±1V of specified value
Gate Charge (Qg): Acceptable within ±50 nC of specified value
Power Dissipation: 3.1W or greater thermal capability

Substitute parts are grouped based on whether they meet all primary criteria and maintain electrical performance within acceptable engineering tolerances. Parts that exceed current rating, maintain or improve Rds On characteristics, and preserve thermal and voltage specifications are classified as direct substitutes.

Parameter Comparison

Parameter	AO4413	AO4447A	AOSP21357	FDS6673BZ	RRH140P03GZETB	SI4413ADY-T1-E3
Manufacturer	Alpha & Omega	Alpha & Omega	Alpha & Omega	onsemi	Rohm	Vishay Siliconix
Vdss (V)	30	30	30	30	30	30
Id @ 25°C (A)	15	17	16	14.5	14	10.5
Rds On (Max) (mOhm)	7 @ 15A, 20V	7 @ 17A, 10V	8.5 @ 16A, 10V	7.8 @ 14.5A, 10V	7 @ 14A, 10V	7.5 @ 13A, 10V
Vgs(th) (Max) (V)	3.5 @ 250µA	1.6 @ 250µA	2.3 @ 250µA	3 @ 250µA	2.5 @ 1mA	3 @ 250µA
Qg (Max) (nC)	61 @ 10V	105 @ 10V	70 @ 10V	124 @ 10V	150 @ 10V	95 @ 5V
Power Dissipation (W)	3.1	3.1	3.1	2.5	0.65	1.5
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOP	8-SOIC
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	to 150	-55 to 150
Product Status	Obsolete	Not For New Designs	Active	Active	Not For New Designs	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Tier 1 - Preferred Substitutes (Active Product Status):

AOSP21357 (Alpha & Omega Semiconductor Inc.) is the primary recommended substitute. It maintains identical 30V Vdss rating, provides 16A continuous drain current (exceeding the 15A requirement), and is classified as Active product status. The device is RoHS3 compliant and operates across the full -55°C to 150°C temperature range. Rds On of 8.5 mOhm at 16A, 10V is within acceptable tolerance. Gate charge of 70 nC is marginally higher than the AO4413 but remains within engineering limits. This part ensures long-term supply chain availability and supports new design initiatives.

SI4413ADY-T1-E3 (Vishay Siliconix) is an alternative Active substitute with identical 30V Vdss and -55°C to 150°C operating range. The 10.5A continuous drain current is lower than the AO4413 specification and may not be suitable for applications requiring the full 15A rating. However, the 7.5 mOhm Rds On and lower gate charge (95 nC @ 5V) provide improved switching characteristics. This part is suitable for applications with reduced current requirements.

FDS6673BZ (onsemi PowerTrench® series) is an Active substitute with 30V Vdss and 14.5A continuous drain current. The 7.8 mOhm Rds On and 2.5W power dissipation provide comparable thermal performance. Gate charge of 124 nC is elevated relative to the AO4413. This part is suitable for general-purpose switching applications within the specified current range.

Tier 2 - Legacy Substitutes (Not For New Designs):

AO4447A (Alpha & Omega Semiconductor Inc.) provides 17A continuous drain current and 7 mOhm Rds On at 10V, exceeding AO4413 electrical specifications. However, product status is classified as Not For New Designs, limiting its suitability for ongoing development. This part may be used for legacy system maintenance or repair applications where supply availability is confirmed.

RRH140P03GZETB (Rohm Semiconductor) is classified as Not For New Designs and features a different package variant (8-SOP vs. 8-SOIC). The 14A continuous drain current and 7 mOhm Rds On are acceptable, but the 650 mW power dissipation is significantly lower than the AO4413 specification, indicating reduced thermal capability. This part is not recommended for new applications.

Selection Criteria Summary:

For new designs and ongoing production, AOSP21357 is the recommended primary substitute based on Active product status, full electrical specification compliance, and long-term availability. SI4413ADY-T1-E3 and FDS6673BZ are acceptable alternatives for applications with reduced current demands or where specific switching characteristics are advantageous. Legacy substitutes (AO4447A, RRH140P03GZETB) should be avoided for new designs due to product status classification.

Frequently Asked Questions (FAQ)

Q1: Can the AO4413 be directly replaced with AOSP21357 without circuit modification?

A: Yes. Both devices share identical 30V Vdss rating, 8-SOIC package configuration, and -55°C to 150°C operating temperature range. AOSP21357 provides 16A continuous drain current, exceeding the AO4413 specification of 15A. Rds On characteristics (8.5 mOhm vs. 7 mOhm) are within acceptable engineering tolerance. No circuit modification is required for pin-compatible substitution.

Q2: Why is SI4413ADY-T1-E3 listed as a substitute if its current rating (10.5A) is lower than the AO4413 (15A)?

A: SI4413ADY-T1-E3 meets all primary substitution criteria (30V Vdss, P-Channel, 8-SOIC package, -55°C to 150°C operation, RoHS3 compliance) and is classified as Active product status. However, the 10.5A continuous drain current is below the AO4413 specification. This part is suitable only for applications where the actual circuit current requirement is 10.5A or less. Circuit analysis is required to confirm compatibility.

Q3: What is the significance of product status classification (Active vs. Not For New Designs vs. Obsolete)?

A: Product status indicates manufacturer support and supply chain availability. Active parts are recommended for new designs and receive ongoing manufacturing support. Not For New Designs parts are available but not recommended for new applications; they may be used for legacy system maintenance. Obsolete parts are no longer manufactured and have limited availability. For long-term production continuity, Active substitutes are strongly preferred.

Q4: Are there package compatibility issues between 8-SOIC and 8-SOP variants?

A: 8-SOIC and 8-SOP are distinct package types with different physical dimensions and pin configurations. RRH140P03GZETB uses 8-SOP packaging, while the AO4413 uses 8-SOIC. These packages are not mechanically interchangeable on standard PCBs. Substitution with 8-SOP variants requires PCB redesign and is not recommended for direct replacement applications.

Q5: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Higher gate charge increases switching losses and may require higher gate drive current. AO4413 specifies 61 nC @ 10V. Substitutes with higher gate charge (e.g., RRH140P03GZETB at 150 nC) may increase power dissipation in high-frequency switching applications. Circuit analysis is recommended for applications operating above 100 kHz.

Q6: What does Rds On (on-state resistance) represent, and why is it critical for substitution?

A: Rds On is the resistance between drain and source when the MOSFET is fully conducting. Lower Rds On reduces conduction losses and heat generation. AO4413 specifies 7 mOhm @ 15A, 20V. Substitutes with equal or lower Rds On (e.g., AO4447A at 7 mOhm, FDS6673BZ at 7.8 mOhm) maintain or improve efficiency. Higher Rds On values increase power dissipation and may require thermal management review.

Q7: Is RoHS3 compliance mandatory for all substitutes?

A: Yes. All listed substitutes are RoHS3 compliant, matching the AO4413 specification. RoHS3 compliance is a regulatory requirement for electronic components in most markets and ensures environmental and safety standards are met. Non-compliant parts should not be used as substitutes.

Q8: Can AOSP21357 be used in applications requiring the full 15A continuous current rating?

A: Yes. AOSP21357 is rated for 16A continuous drain current at 25°C, which exceeds the 15A requirement of the AO4413. The device provides adequate current capacity with margin for thermal and operational variations. No derating is necessary for 15A applications.

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