FDS6679 P-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDS6679 is a P-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 13A continuous drain current at 25°C. This device is housed in an 8-SOIC surface mount package and is part of the PowerTrench® series. The FDS6679 carries an obsolete product status, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Active alternatives and direct successors are available to maintain circuit functionality and performance specifications.

Substiute Parts

FDS6679

onsemiIn Stock: 50372FDS6679 Datasheet

Current PartRFQ

FDS6679AZ

onsemiIn Stock: 50302FDS6679AZ Datasheet

DirectRFQ

AO4407A

Alpha & Omega Semiconductor Inc.In Stock: 150425AO4407A Datasheet

SimilarRFQ

SI4427BDY-T1-GE3

Vishay SiliconixIn Stock: 826SI4427BDY-T1-GE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDS6679 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• FET Type: P-Channel topology
• Drain to Source Voltage (Vdss): 30V minimum rating
• Current - Continuous Drain (Id): 13A or greater at 25°C
• Rds On (Max): 9 mOhm or lower at specified gate voltage
• Power Dissipation: 2.5W or greater
• Mounting Type: Surface Mount
• Package: 8-SOIC form factor
• Operating Temperature: -55°C minimum to 150°C or higher

Direct Equivalent: FDS6679AZ is the active production successor from onsemi, maintaining identical electrical specifications with minor parameter variations within acceptable engineering tolerances.

Similar Substitutes: AO4407A and SI4427BDY-T1-GE3 provide functional equivalence with trade-offs in current rating, on-resistance, or power dissipation. These parts satisfy the core voltage and package requirements but operate at reduced current or power levels.

Parameter Comparison

Engineering Selection Recommendations

FDS6679AZ (Direct Equivalent - Recommended for Direct Replacement)

FDS6679AZ is the active production part from onsemi and represents the direct successor to the obsolete FDS6679. This part maintains electrical equivalence with negligible parameter variance: Rds On increases by 0.3 mOhm (9 mOhm to 9.3 mOhm), and gate charge decreases by 4 nC (100 nC to 96 nC). The maximum operating temperature is reduced from 175°C to 150°C. FDS6679AZ carries active product status and full ROHS3 compliance, making it the preferred choice for production designs requiring direct pin-for-pin replacement.

AO4407A (Functional Substitute - Current and Power Trade-off)

AO4407A from Alpha & Omega Semiconductor provides functional equivalence with reduced continuous drain current (12A versus 13A) and increased on-resistance (11 mOhm versus 9 mOhm). Power dissipation capability is higher at 3.1W. This part is designated "Not For New Designs" and carries ROHS3 compliance. AO4407A is suitable for applications where the 12A current rating and 11 mOhm on-resistance are acceptable within circuit margin requirements.

SI4427BDY-T1-GE3 (Functional Substitute - Current and Power Reduction)

SI4427BDY-T1-GE3 from Vishay Siliconix operates at reduced continuous drain current (9.7A versus 13A) and lower power dissipation (1.5W versus 2.5W). On-resistance is 10.5 mOhm at 12.6A and 10V. This part carries active product status and ROHS3 compliance. SI4427BDY-T1-GE3 is applicable only to designs where current requirements do not exceed 9.7A and power dissipation is limited to 1.5W.

Frequently Asked Questions (FAQ)

Q: Can FDS6679AZ be used as a direct replacement for FDS6679?

A: Yes. FDS6679AZ is the active production equivalent from onsemi. Electrical parameters are equivalent within engineering tolerance. The primary difference is reduced maximum operating temperature (150°C versus 175°C). Verify that your application does not require junction temperatures above 150°C.

Q: What is the key difference between FDS6679 and AO4407A?

A: AO4407A has lower continuous drain current (12A versus 13A) and higher on-resistance (11 mOhm versus 9 mOhm). Use AO4407A only if your circuit operates below 12A and can tolerate increased on-resistance losses.

Q: Can SI4427BDY-T1-GE3 replace FDS6679 in all applications?

A: No. SI4427BDY-T1-GE3 is rated for only 9.7A continuous drain current and 1.5W power dissipation, compared to FDS6679's 13A and 2.5W. This part is suitable only for low-current applications within these reduced specifications.

Q: Are all substitute parts in the same 8-SOIC package?

A: Yes. FDS6679, FDS6679AZ, AO4407A, and SI4427BDY-T1-GE3 are all housed in 8-SOIC (0.154", 3.90mm Width) packages. PCB layout and footprints are identical.

Q: Do all parts meet RoHS3 compliance?

A: Yes. FDS6679AZ, AO4407A, and SI4427BDY-T1-GE3 all carry ROHS3 Compliant status. All parts have MSL Rating 1 (Unlimited moisture sensitivity level).

Q: What is the operating temperature range difference between FDS6679 and its substitutes?

A: FDS6679 operates from -55°C to 175°C (TJ). FDS6679AZ, AO4407A, and SI4427BDY-T1-GE3 all operate from -55°C to 150°C (TJ). Applications requiring junction temperatures above 150°C cannot use the active substitutes.

Q: Which substitute part has the lowest on-resistance?

A: FDS6679 and FDS6679AZ have the lowest on-resistance at 9 mOhm and 9.3 mOhm respectively. SI4427BDY-T1-GE3 is 10.5 mOhm, and AO4407A is 11 mOhm.

Q: Is FDS6679AZ available in the same packaging options as FDS6679?

A: FDS6679AZ is supplied in Cut Tape (CT) and Digi-Reel® packaging. Verify packaging availability with your supplier for production requirements.