AO7405 Equivalent & Substitute Parts

Part Overview

The AO7405 is a P-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 1.4A continuous drain current at 25°C. The device is packaged in a 6-TSSOP (SC-70-6) surface mount configuration and dissipates a maximum of 350mW. The AO7405 carries a product status of "Not For New Designs," indicating that while the part remains available in inventory (39,300 pieces), new circuit designs should consider active alternative components. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, ensure design continuity, and provide options for applications where the original part may become unavailable.

Substiute Parts

AO7405

Alpha & Omega Semiconductor Inc.In Stock: 39367AO7405 Datasheet

Current PartRFQ

AOSX21319C

Alpha & Omega Semiconductor Inc.In Stock: 914AOSX21319C Datasheet

MFR RecommendedRFQ

FDG312P

Fairchild SemiconductorIn Stock: 111913FDG312P Datasheet

MFR RecommendedRFQ

FDG316P

Fairchild SemiconductorIn Stock: 8332FDG316P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AO7405 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• FET Type: Must be P-Channel MOSFET
• Drain to Source Voltage (Vdss): Substitute must equal or exceed 30V
• Continuous Drain Current (Id): Substitute must meet or exceed 1.4A at 25°C
• Operating Temperature Range: Must span -55°C to 150°C
• Gate Voltage (Vgs Max): Must accommodate ±12V or higher

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Package / Case: Must be compatible with 6-TSSOP, SC-88, or SOT-363 footprints

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (Alpha & Omega Semiconductor Inc.) and Cross-Manufacturer Alternatives (Fairchild Semiconductor). All listed substitutes meet the minimum electrical and mechanical requirements for direct replacement in the AO7405 application circuit.

Parameter Comparison

Engineering Selection Recommendations

AOSX21319C (Alpha & Omega Semiconductor Inc.) — Preferred Direct Substitute

The AOSX21319C is the manufacturer-recommended substitute for the AO7405. Both devices are manufactured by Alpha & Omega Semiconductor Inc. and share identical Vdss (30V) and operating temperature specifications (-55°C to 150°C). The AOSX21319C provides enhanced electrical performance with 2.6A continuous drain current (versus 1.4A) and lower on-resistance (100 mOhm versus 150 mOhm), delivering superior thermal characteristics with 1.1W power dissipation capability. The AOSX21319C maintains ROHS3 compliance and carries an Active product status, making it suitable for new designs. Gate voltage rating increases to ±20V, providing greater design margin. This substitute is electrically and mechanically compatible with the AO7405 footprint and pinout.

FDG316P (Fairchild Semiconductor) — Cross-Manufacturer Alternative

The FDG316P is a Fairchild Semiconductor PowerTrench® P-Channel MOSFET that meets the AO7405 electrical specifications with 30V Vdss and 1.6A continuous drain current. The device operates across the identical temperature range (-55°C to 150°C) and is packaged in the same 6-TSSOP/SC-88/SOT-363 footprint. The FDG316P exhibits slightly higher on-resistance (190 mOhm versus 150 mOhm) but maintains 750mW power dissipation. Gate voltage rating of ±20V exceeds the AO7405 requirement. The FDG316P carries an Active product status and is suitable for new designs. This part provides a viable cross-manufacturer option with established supply availability (8,257 pieces in stock).

FDG312P (Fairchild Semiconductor) — Limited Compatibility Substitute

The FDG312P is a Fairchild Semiconductor PowerTrench® P-Channel MOSFET with reduced voltage rating (20V Vdss versus 30V). While the device meets the 1.2A continuous drain current requirement and shares the identical operating temperature range and package footprint, the lower Vdss rating restricts its use to applications where the maximum supply voltage does not exceed 20V. The FDG312P is not suitable for circuits designed to operate at the full 30V specification of the AO7405. This substitute is applicable only when circuit design margins permit operation at reduced voltage ratings. The device carries an Active product status and offers high inventory availability (111,808 pieces in stock).

Frequently Asked Questions (FAQ)

Q: Can the AOSX21319C directly replace the AO7405 in existing circuit designs?

A: Yes. The AOSX21319C is the manufacturer-recommended substitute and maintains electrical and mechanical compatibility with the AO7405. Both devices share identical Vdss (30V), operating temperature range (-55°C to 150°C), and package footprint (6-TSSOP/SC-88/SOT-363). The AOSX21319C provides enhanced performance with higher current rating (2.6A versus 1.4A) and lower on-resistance, making it a direct drop-in replacement.

Q: What is the primary difference between the AO7405 and AOSX21319C?

A: The AOSX21319C provides superior electrical performance with 2.6A continuous drain current compared to the AO7405's 1.4A rating, and lower on-resistance (100 mOhm versus 150 mOhm). The AOSX21319C also carries an Active product status, whereas the AO7405 is designated "Not For New Designs." Both devices maintain identical voltage ratings and operating temperature specifications.

Q: Can the FDG316P be used as a substitute for the AO7405?

A: Yes. The FDG316P meets the electrical requirements with 30V Vdss, 1.6A continuous drain current, and identical operating temperature range. The device is packaged in the same 6-TSSOP/SC-88/SOT-363 footprint and carries an Active product status. The FDG316P is a viable cross-manufacturer alternative with established supply availability.

Q: Why is the FDG312P not recommended as a primary substitute?

A: The FDG312P has a reduced Vdss rating of 20V compared to the AO7405's 30V specification. This lower voltage rating restricts its use to applications where the maximum supply voltage does not exceed 20V. The FDG312P is only suitable for circuits designed to operate at reduced voltage margins.

Q: Are all substitute parts RoHS compliant?

A: The AOSX21319C is explicitly ROHS3 compliant. The Fairchild Semiconductor parts (FDG316P and FDG312P) do not have RoHS compliance status specified in the provided data. Compliance verification with Fairchild documentation is required for applications with RoHS requirements.

Q: Do all substitute parts share the same package footprint as the AO7405?

A: Yes. All substitute parts (AOSX21319C, FDG316P, and FDG312P) are packaged in the 6-TSSOP, SC-88, or SOT-363 configuration, ensuring mechanical compatibility with the AO7405 PCB layout and assembly process.

Q: What is the inventory status of each substitute part?

A: AOSX21319C has 887 pieces in stock, FDG316P has 8,257 pieces in stock, and FDG312P has 111,808 pieces in stock. The AO7405 original part has 39,300 pieces available. Inventory levels should be verified with the supplier for current availability.

Q: Can the AO7405 be used in new circuit designs?

A: The AO7405 carries a "Not For New Designs" product status. New circuit designs should utilize the AOSX21319C or FDG316P, both of which carry Active product status and provide equivalent or enhanced electrical performance.