AO7400 N-Channel MOSFET 30V 1.7A SC70-3 Equivalent & Substitute Parts

Part Overview

The AO7400 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 1.7A continuous drain current at 25°C. The device is housed in an SC-70 (SOT-323) surface mount package and dissipates a maximum of 350mW. The AO7400 carries a product status of "Not For New Designs," indicating that Alpha & Omega Semiconductor Inc. has discontinued active development and support for this part number. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and transition to actively supported alternatives that meet the same electrical and mechanical requirements.

Substiute Parts

AO7400

Alpha & Omega Semiconductor Inc.In Stock: 111978AO7400 Datasheet

Current PartRFQ

AOSN32338C

Alpha & Omega Semiconductor Inc.In Stock: 1235AOSN32338C Datasheet

MFR RecommendedRFQ

DMN3067LW-13

Diodes IncorporatedIn Stock: 7122DMN3067LW-13 Datasheet

MFR RecommendedRFQ

DMN3067LW-7

Diodes IncorporatedIn Stock: 10004DMN3067LW-7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AO7400 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• FET Type: N-Channel
• Drain-to-Source Voltage (Vdss): 30V (minimum requirement)
• Package Type: SC-70 or SOT-323 (surface mount, three-terminal configuration)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C (TJ)
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Performance Parameters (Substitution Allowance):

• Continuous Drain Current (Id): Equal to or greater than 1.7A
• On-Resistance (Rds On): Equal to or lower than 85 mOhm (at comparable gate voltage)
• Gate Threshold Voltage (Vgs(th)): Within ±0.1V of 1.4V
• Power Dissipation: Equal to or greater than 350mW
• Gate Charge (Qg): Comparable to 4.82 nC (no strict upper limit, but lower values preferred for switching performance)

Substitute parts must maintain electrical compatibility within the AO7400's operating envelope while offering equal or improved performance characteristics. All substitute parts listed are actively supported by their respective manufacturers and carry ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

AOSN32338C (Alpha & Omega Semiconductor Inc.)

The AOSN32338C is an active, manufacturer-recommended substitute from the same semiconductor family. It maintains identical Vdss (30V) and package specifications (SC-70, SOT-323) as the AO7400. The AOSN32338C provides superior performance with 3.7A continuous drain current (2.18× the AO7400 rating) and lower on-resistance (51 mOhm versus 85 mOhm). Power dissipation capability increases to 1.1W, providing additional thermal margin. Gate threshold voltage is 1.5V, within acceptable tolerance of the AO7400's 1.4V specification. This part is actively supported and ROHS3 compliant. Selection of the AOSN32338C is appropriate for applications requiring higher current capacity or improved thermal performance while maintaining full electrical compatibility.

DMN3067LW-13 and DMN3067LW-7 (Diodes Incorporated)

Both DMN3067LW variants are active, cross-manufacturer substitutes manufactured by Diodes Incorporated. These parts maintain identical Vdss (30V) and package specifications (SC-70, SOT-323). The DMN3067LW series provides 2.6A continuous drain current (1.53× the AO7400 rating) with 67 mOhm on-resistance and 500mW power dissipation. Gate threshold voltage is 1.5V, within acceptable tolerance. Gate charge is 4.6 nC at 4.5V, comparable to the AO7400's 4.82 nC at 4.5V, indicating similar switching characteristics. Both variants are actively supported and ROHS3 compliant. The primary difference between DMN3067LW-13 and DMN3067LW-7 is packaging format: DMN3067LW-13 is supplied in Tape & Reel (TR), while DMN3067LW-7 is supplied in Cut Tape (CT) & Digi-Reel®. Selection between these variants depends on procurement and assembly requirements. The DMN3067LW series is appropriate for applications requiring cross-manufacturer qualification or alternative supply sources.

Frequently Asked Questions (FAQ)

Q: Can the AOSN32338C directly replace the AO7400 in existing designs?

A: Yes. The AOSN32338C maintains identical Vdss (30V), package type (SC-70, SOT-323), and operating temperature range (-55°C to 150°C). Pin configuration and footprint are identical. The AOSN32338C provides higher current capacity (3.7A versus 1.7A) and lower on-resistance (51 mOhm versus 85 mOhm), making it a direct electrical upgrade. No circuit modifications are required.

Q: What is the difference between DMN3067LW-13 and DMN3067LW-7?

A: Both parts are electrically identical N-Channel MOSFETs with 30V Vdss, 2.6A continuous drain current, and SC-70 (SOT-323) packaging. The difference is packaging format: DMN3067LW-13 is supplied in Tape & Reel (TR) format for automated assembly, while DMN3067LW-7 is supplied in Cut Tape (CT) & Digi-Reel® format for manual or mixed assembly processes. Select based on your procurement and assembly workflow.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The AO7400 and all listed substitute parts (AOSN32338C, DMN3067LW-13, DMN3067LW-7) are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Can I use the DMN3067LW series in high-temperature applications?

A: Yes. The DMN3067LW series operates across the full temperature range of -55°C to 150°C (TJ), identical to the AO7400. No thermal derating is required within this range based on the provided specifications.

Q: Why does the AOSN32338C have higher gate charge than the AO7400?

A: The AOSN32338C has a gate charge of 16 nC at 10V, compared to the AO7400's 4.82 nC at 4.5V. Gate charge is measured at different gate voltages, making direct comparison difficult. The AOSN32338C's higher current rating (3.7A versus 1.7A) and lower on-resistance contribute to the increased gate charge. For switching speed-critical applications, verify gate charge specifications at your specific gate drive voltage.

Q: Is the AO7400 still available for new designs?

A: No. The AO7400 carries a product status of "Not For New Designs," indicating that Alpha & Omega Semiconductor Inc. has discontinued active support. For new designs, select from the active substitute parts listed: AOSN32338C (same manufacturer, recommended), or DMN3067LW-13/DMN3067LW-7 (cross-manufacturer alternatives).

Q: What is the pin configuration for these MOSFETs?

A: All parts use the SC-70 (SOT-323) three-terminal surface mount package. Pin configuration is Gate (G), Drain (D), and Source (S). Verify exact pin order in the manufacturer's datasheet before assembly, as pin assignments may vary by manufacturer.

Q: Can I substitute the AO7400 with a higher-rated MOSFET from a different package type?

A: No. All substitute parts listed maintain the SC-70 (SOT-323) package specification to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes. Substitution with different package types requires PCB redesign and is outside the scope of this equivalency guide.