AO4476AL N-Channel MOSFET 30V 15A Equivalent & Substitute Parts

Part Overview

The AO4476AL is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 15A continuous drain current in an 8-SOIC surface mount package. This device is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing production and design requirements. The part delivers 3.1W maximum power dissipation and operates across the temperature range of -55°C to 150°C (TJ).

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	15	A (Ta)
Rds On (Max) @ Id, Vgs	7.7	mOhm @ 15A, 10V
Vgs(th) (Max) @ Id	2.5	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	24	nC @ 10V
Vgs (Max)	±20	V
Input Capacitance (Ciss) (Max) @ Vds	1380	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)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AO4476AL is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id): Must equal or exceed 15A at 25°C
Gate-Source Voltage (Vgs): Must support ±20V maximum rating
Operating Temperature Range: Must encompass -55°C to 150°C (TJ)
Mounting Type: Surface Mount required
Package Compatibility: 8-SOIC or equivalent footprint

Secondary Compatibility Factors:

On-Resistance (Rds On): Lower values indicate improved performance; 7.7mOhm @ 15A, 10V is the baseline
Gate Charge (Qg): Lower values reduce switching losses; 24nC @ 10V is the reference
Power Dissipation: 3.1W (Ta) represents thermal design baseline
Threshold Voltage (Vgs(th)): 2.5V @ 250µA establishes gate drive compatibility

Substitute parts are grouped into two categories: direct equivalents from Alpha & Omega Semiconductor Inc. (same manufacturer, identical electrical specifications) and cross-manufacturer alternatives (Renesas Electronics Corporation, Vishay Siliconix) that meet or exceed the electrical and thermal requirements while maintaining package compatibility.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd Max (W)	Package	Status
AO4476AL	Alpha & Omega	30	15	7.7 @ 15A, 10V	24 @ 10V	1380 @ 15V	3.1	8-SOIC	Obsolete
AO4476A	Alpha & Omega	30	15	7.7 @ 15A, 10V	24 @ 10V	1380 @ 15V	3.1	8-SOIC	Not For New Designs
AO4476G	Alpha & Omega	30	15	10.5 @ 15A, 10V	23 @ 10V	1200 @ 15V	3.7	8-SOIC	Active
HAT2197R-EL-E	Renesas	30	16	6.7 @ 8A, 10V	18 @ 4.5V	2650 @ 10V	2.5	8-SOP	Active
RJK0354DSP-00#J0	Renesas	30	16	7 @ 8A, 10V	12 @ 4.5V	1740 @ 10V	2	8-SOP	Active
SI4386DY-T1-E3	Vishay Siliconix	30	11	7 @ 16A, 10V	18 @ 4.5V	—	1.47	8-SOIC	Active
SI4386DY-T1-GE3	Vishay Siliconix	30	11	7 @ 16A, 10V	18 @ 4.5V	—	1.47	8-SOIC	Active
SI4874BDY-T1-E3	Vishay Siliconix	30	12	7 @ 16A, 10V	25 @ 4.5V	3230 @ 15V	1.6	8-SOIC	Active

Engineering Selection Recommendations

Direct Equivalent (Same Manufacturer):

The AO4476G represents the manufacturer-recommended upgrade path from the obsolete AO4476AL. Both devices are manufactured by Alpha & Omega Semiconductor Inc. and share identical electrical specifications for Vdss (30V), Id (15A), Vgs(th) (2.5V @ 250µA), and Vgs (±20V). The AO4476G carries Active product status and ROHS3 compliance, making it suitable for new designs. The AO4476G exhibits slightly higher on-resistance (10.5mOhm vs. 7.7mOhm) and power dissipation (3.7W vs. 3.1W), with reduced input capacitance (1200pF vs. 1380pF). These variations remain within acceptable design margins for most applications requiring 30V, 15A N-Channel MOSFET functionality.

Cross-Manufacturer Alternatives (Active Status):

The Renesas HAT2197R-EL-E and RJK0354DSP-00#J0 devices exceed the AO4476AL current rating (16A vs. 15A) while maintaining 30V Vdss and ±20V Vgs specifications. Both employ 8-SOP packaging, which is mechanically compatible with 8-SOIC footprints. The HAT2197R-EL-E delivers superior on-resistance (6.7mOhm @ 8A, 10V) and reduced power dissipation (2.5W). The RJK0354DSP-00#J0 provides the lowest gate charge (12nC @ 4.5V) and power dissipation (2W), optimizing for high-frequency switching applications.

The Vishay Siliconix SI4874BDY-T1-E3 provides 12A continuous drain current with 30V Vdss and maintains the 8-SOIC package format. This device features TrenchFET® technology, reduced power dissipation (1.6W), and gate charge of 25nC @ 4.5V. The SI4386DY-T1-E3 and SI4386DY-T1-GE3 variants (differing only in packaging: Tape & Reel vs. Cut Tape) deliver 11A continuous current with identical electrical characteristics and the lowest power dissipation (1.47W) among active alternatives.

All recommended substitutes carry ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and EAR99 export classification, matching the regulatory profile of the original AO4476AL.

Frequently Asked Questions (FAQ)

Q: Can the AO4476AL be directly replaced with the AO4476A?

A: The AO4476A shares identical electrical specifications with the AO4476AL (30V, 15A, 7.7mOhm Rds On, 24nC gate charge). However, the AO4476A carries "Not For New Designs" status. For new production, the AO4476G is the manufacturer-recommended active alternative.

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

A: Both 8-SOIC and 8-SOP are surface mount packages with 0.154" (3.90mm) width and identical pin pitch. They are mechanically and electrically interchangeable for PCB layout purposes. The designations reflect different manufacturing standards but do not affect functional compatibility.

Q: Why do some substitute parts have lower continuous drain current ratings than the AO4476AL?

A: The SI4386DY-T1-E3 and SI4386DY-T1-GE3 devices are rated for 11A continuous drain current, below the AO4476AL specification of 15A. These parts are suitable only for applications requiring ≤11A continuous current. For applications requiring the full 15A rating, select AO4476G, HAT2197R-EL-E, RJK0354DSP-00#J0, or SI4874BDY-T1-E3.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original AO4476AL does not specify ROHS status, but all active alternatives meet this regulatory requirement.

Q: What does "Moisture Sensitivity Level 1 (Unlimited)" mean?

A: MSL 1 indicates the component can be stored indefinitely without moisture absorption concerns. No special dry-pack storage or baking procedures are required before soldering. All listed parts share this MSL 1 rating.

Q: Which substitute offers the lowest on-resistance?

A: The Renesas HAT2197R-EL-E delivers the lowest on-resistance at 6.7mOhm @ 8A, 10V. However, this specification is measured at 8A, not the full 15A rating of the AO4476AL. At the 15A operating point, the AO4476AL and AO4476A maintain 7.7mOhm, while the AO4476G increases to 10.5mOhm.

Q: Can I use a substitute with higher gate charge in a high-frequency switching application?

A: Gate charge directly affects switching losses and frequency capability. The AO4476AL specifies 24nC @ 10V. Substitutes with higher gate charge (such as SI4874BDY-T1-E3 at 25nC @ 4.5V) may increase switching losses. Conversely, parts with lower gate charge (RJK0354DSP-00#J0 at 12nC @ 4.5V) reduce switching losses. Selection depends on the specific switching frequency and thermal budget of the application.

Q: What is the operating temperature range for all substitute parts?

A: The AO4476AL operates from -55°C to 150°C (TJ). All recommended substitutes maintain this full temperature range, ensuring compatibility across industrial and automotive applications.

Q: Is the AO4476A still available for purchase?

A: The AO4476A carries "Not For New Designs" status with 29,561 pieces in stock. While available for legacy system support, new designs should transition to the AO4476G or cross-manufacturer alternatives.

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