AON7409 MOSFET P-Channel 30V Equivalent & Substitute Parts

Part Overview

The AON7409 is a P-Channel MOSFET rated for 30V drain-to-source voltage with continuous drain current of 16A (Ta) and 32A (Tc). This device is packaged in an 8-DFN-EP (3x3) surface mount configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications. Substitute parts must maintain electrical compatibility across key parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating packaging variations.

Substiute Parts

AON7409

Alpha & Omega Semiconductor Inc.In Stock: 250419AON7409 Datasheet

Current PartRFQ

AONR21357

Alpha & Omega Semiconductor Inc.In Stock: 6024AONR21357 Datasheet

MFR RecommendedRFQ

PJQ4401P_R2_00001

Panjit International Inc.In Stock: 3289PJQ4401P_R2_00001 Datasheet

MFR RecommendedRFQ

RQ3E120ATTB

Rohm SemiconductorIn Stock: 125135RQ3E120ATTB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AON7409 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• FET Type: P-Channel topology required
• Drain to Source Voltage (Vdss): 30V minimum rating
• Current - Continuous Drain (Id): Minimum 16A at Ta or equivalent thermal performance
• Rds On (Max): On-resistance at specified gate voltage and current
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Surface Mount
• Package Classification: 8-PowerVDFN or compatible 8-pin DFN variants

Substitute parts are grouped into two categories:

1. Direct Electrical Equivalents with Enhanced Performance (AONR21357): Same manufacturer, identical voltage rating, improved current capacity and on-resistance characteristics, same package family, active product status.

2. Functional Equivalents with Package Variation (PJQ4401P_R2_00001, RQ3E120ATTB): Alternate manufacturers, identical voltage rating, compatible current and on-resistance specifications, different DFN package variants, active product status.

All substitute parts maintain ROHS3 compliance, MSL Level 1, and operating temperature range compatibility with the original AON7409.

Parameter Comparison

Engineering Selection Recommendations

AONR21357 (Alpha & Omega Semiconductor Inc.)

The AONR21357 is the primary recommended substitute for the obsolete AON7409. This part maintains identical voltage rating (30V Vdss) and package family (8-DFN-EP 3x3), with enhanced electrical performance including higher continuous drain current (21A Ta / 34A Tc versus 16A Ta / 32A Tc) and improved on-resistance (7.8 mOhm versus 8.5 mOhm). The AONR21357 carries active product status with established supply chain availability. All compliance certifications (ROHS3, MSL Level 1) and operating temperature range (-55°C to 150°C TJ) are maintained. This substitute is suitable for direct replacement in applications where the original AON7409 was specified.

PJQ4401P_R2_00001 (Panjit International Inc.)

The PJQ4401P_R2_00001 provides functional equivalence with identical 30V voltage rating and compatible on-resistance characteristics (8.5 mOhm). This part features significantly higher case temperature drain current (50A Tc) and lower gate charge (27 nC at 4.5V), making it suitable for applications requiring enhanced thermal performance or reduced switching losses. The package variant (DFN3333-8) differs from the original 8-DFN-EP but maintains 8-PowerVDFN classification. Vgs maximum rating is reduced to ±20V. Active product status and full compliance certifications are maintained. PCB layout modifications may be required due to package footprint differences.

RQ3E120ATTB (Rohm Semiconductor)

The RQ3E120ATTB offers functional substitution with identical 30V voltage rating and compatible on-resistance (8 mOhm at 12A, 10V). Continuous drain current at Ta is lower (12A versus 16A), limiting suitability to applications with reduced current requirements. The 8-HSMT package variant (3.2x3) differs from the original 8-DFN-EP, requiring PCB layout verification. Operating temperature specification is limited to 150°C maximum (TJ) without lower temperature bound specification. Active product status and full compliance certifications are maintained. This substitute is appropriate for lower-current applications where package footprint compatibility can be accommodated.

Frequently Asked Questions (FAQ)

Q: Can the AONR21357 be used as a direct replacement for the AON7409 without circuit modifications?

A: The AONR21357 maintains identical voltage rating (30V), same package family (8-DFN-EP 3x3), and compatible electrical characteristics. Direct PCB replacement is possible without circuit modifications. The enhanced current capacity and improved on-resistance provide performance margin in the original application.

Q: What are the key differences between the PJQ4401P_R2_00001 and the original AON7409?

A: The PJQ4401P_R2_00001 maintains identical 30V voltage rating and on-resistance specification. Primary differences include package variant (DFN3333-8 versus 8-DFN-EP), lower continuous drain current at Ta (10A versus 16A), significantly higher case temperature current (50A Tc), reduced gate charge (27 nC), and reduced Vgs maximum (±20V versus ±25V). PCB layout modifications are required due to package footprint differences.

Q: Is the RQ3E120ATTB suitable for all applications using the AON7409?

A: The RQ3E120ATTB is suitable for applications where continuous drain current does not exceed 12A at Ta. The 8-HSMT package variant requires PCB layout verification for footprint compatibility. Applications requiring the full 16A continuous current capacity of the AON7409 should use the AONR21357 instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts (AONR21357, PJQ4401P_R2_00001, RQ3E120ATTB) are ROHS3 compliant with MSL Level 1 rating, matching the original AON7409 compliance status.

Q: What is the operating temperature range for each substitute part?

A: The AONR21357 and PJQ4401P_R2_00001 maintain the full operating range of -55°C to 150°C (TJ). The RQ3E120ATTB specifies 150°C maximum (TJ) without explicit lower temperature bound. Applications requiring full -55°C to 150°C operation should verify RQ3E120ATTB specifications with the manufacturer.

Q: How do gate charge specifications affect switching performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET. The PJQ4401P_R2_00001 has significantly lower gate charge (27 nC at 4.5V) compared to the AON7409 (58 nC at 10V), resulting in reduced switching losses and faster switching transitions. The AONR21357 and RQ3E120ATTB have comparable gate charge to the original part.

Q: Can package footprint differences affect circuit performance?

A: Package footprint differences (8-DFN-EP versus DFN3333-8 versus 8-HSMT) do not affect electrical performance but require PCB layout verification. Thermal performance may vary due to different pad configurations and thermal vias. The AONR21357 uses identical package (8-DFN-EP 3x3) and requires no layout changes. The PJQ4401P_R2_00001 and RQ3E120ATTB require layout verification and potential redesign.

Q: What is the significance of Rds On (on-resistance) in substitute selection?

A: On-resistance directly affects power dissipation and thermal performance. Lower on-resistance reduces I²R losses. The AONR21357 (7.8 mOhm) provides improved efficiency compared to the AON7409 (8.5 mOhm). The PJQ4401P_R2_00001 and RQ3E120ATTB maintain comparable on-resistance, ensuring similar thermal behavior in equivalent current applications.

Q: Are there inventory considerations for substitute part selection?

A: The AONR21357 has 5,970 pieces in stock, the PJQ4401P_R2_00001 has 3,180 pieces, and the RQ3E120ATTB has 125,100 pieces available. Inventory levels should be verified with suppliers for production requirements and lead time planning.