AOD4186 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AOD4186 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 40V drain-to-source voltage with continuous drain current of 10A at Ta and 35A at Tc. The device is housed in a Surface Mount TO-252 (DPAK) package and is designed for general-purpose switching and amplification applications. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance, package compatibility, and compliance certifications align with the original specification, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

AOD4186

Alpha & Omega Semiconductor Inc.In Stock: 28086AOD4186 Datasheet

Current PartRFQ

STD44N4LF6

STMicroelectronicsIn Stock: 15272STD44N4LF6 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AOD4186 are qualified based on the following electrical and mechanical criteria:

Voltage Rating: Drain-to-source voltage (Vdss) must equal or exceed 40V to maintain safe operation across the original design envelope.

Package Compatibility: The substitute must use the TO-252 (DPAK) Surface Mount package to ensure mechanical and thermal compatibility with existing PCB layouts and thermal management infrastructure.

Continuous Drain Current: The substitute must support continuous drain current ratings at Tc that meet or exceed the original 35A specification to handle the same load conditions.

On-State Resistance (RDS(on)): The substitute RDS(on) value must not exceed the original specification to prevent increased power dissipation and thermal stress in the circuit.

Gate Threshold Voltage (Vgs(th)): The substitute threshold voltage must remain within compatible ranges to ensure proper gate drive voltage compatibility.

Compliance & Status: The substitute must maintain Active product status and RoHS3 compliance to satisfy regulatory and supply chain requirements.

The STD44N4LF6 meets all substitution criteria through equivalent voltage rating, identical package type, superior continuous drain current capability (44A at Tc), improved on-state resistance (12.5mOhm), and full compliance alignment.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: STD44N4LF6

The STD44N4LF6 manufactured by STMicroelectronics is a direct substitute for the AOD4186. Both devices maintain identical voltage ratings (40V Vdss), identical package configuration (TO-252 DPAK), and identical operating temperature range (-55°C to 175°C). Both parts carry Active product status, RoHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and REACH unaffected status.

The STD44N4LF6 provides performance advantages over the AOD4186 through higher continuous drain current capability (44A at Tc versus 35A at Tc) and lower on-state resistance (12.5mOhm versus 15mOhm at 20A, 10V). These characteristics result in reduced power dissipation and improved thermal performance in equivalent circuit applications. Gate threshold voltage (2.5V versus 2.7V) and gate charge (22nC versus 20nC) remain within compatible operating ranges for standard gate drive circuits.

Both parts satisfy identical regulatory and compliance requirements, ensuring seamless integration into supply chains and manufacturing processes without additional qualification or documentation.

Frequently Asked Questions (FAQ)

Q: Can the STD44N4LF6 be used as a direct replacement for the AOD4186 in existing designs?

A: Yes. Both devices share identical voltage ratings (40V), identical package type (TO-252 DPAK), identical operating temperature range (-55°C to 175°C), and identical compliance certifications (RoHS3, REACH unaffected, MSL 1). The STD44N4LF6 provides equal or superior electrical performance across all critical parameters.

Q: What are the key electrical differences between these two parts?

A: The STD44N4LF6 offers higher continuous drain current (44A at Tc versus 35A at Tc) and lower on-state resistance (12.5mOhm versus 15mOhm at 20A, 10V). Gate threshold voltage is slightly lower (2.5V versus 2.7V), and gate charge is marginally higher (22nC versus 20nC). These differences result in improved efficiency and reduced thermal stress in the substitute device.

Q: Are the package dimensions identical between AOD4186 and STD44N4LF6?

A: Yes. Both devices use the TO-252-3 DPAK (2 Leads + Tab) Surface Mount package, also designated SC-63. PCB footprints, lead spacing, and thermal pad dimensions are identical, enabling direct board-level substitution without layout modifications.

Q: Do both parts require identical gate drive voltage?

A: Both devices operate with gate drive voltages in the range of 5V to 10V (Max RDS(on) specification points). Gate threshold voltages are compatible (2.7V for AOD4186, 2.5V for STD44N4LF6), ensuring proper switching behavior with standard gate drive circuits.

Q: What is the moisture sensitivity rating for both parts?

A: Both the AOD4186 and STD44N4LF6 carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special precautions.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are RoHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.29.0095) classifications. Both maintain Active product status with full manufacturer support.