FDS6975 Equivalent & Substitute Parts

Part Overview

The FDS6975 is a dual P-channel MOSFET array manufactured by onsemi, designed for surface mount applications in the 8-SOIC package. This device features a 30V drain-to-source voltage rating with 6A continuous drain current capability and is classified as a logic level gate MOSFET. The part is currently in active production status with extensive inventory availability.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the same package type and thermal operating range. The FDS6975 has three qualified substitute options that meet these criteria while offering variations in power dissipation and current handling characteristics.

Substiute Parts

FDS6975

onsemiIn Stock: 28676FDS6975 Datasheet

Current PartRFQ

AUIRF7316QTR

Infineon TechnologiesIn Stock: 5998AUIRF7316QTR Datasheet

DirectRFQ

AO4813

Alpha & Omega Semiconductor Inc.In Stock: 120266AO4813 Datasheet

SimilarRFQ

SI4925DDY-T1-GE3

Vishay SiliconixIn Stock: 16972SI4925DDY-T1-GE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FDS6975 is determined by the following criteria:

Mandatory Compatibility Parameters:

• Drain to Source Voltage (Vdss): 30V (exact match required)
• Configuration: 2 P-Channel (Dual) (exact match required)
• Package / Case: 8-SOIC (0.154", 3.90mm Width) (exact match required)
• Operating Temperature Range: -55°C to 150°C (TJ) (exact match required)
• Technology: MOSFET (Metal Oxide) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• FET Feature: Logic Level Gate (exact match required)

Performance Parameters (Allowable Variation):

• Current - Continuous Drain (Id) @ 25°C: Substitute must equal or exceed 6A
• Rds On (Max) @ Id, Vgs: Substitute must equal or be lower (better performance)
• Power - Max: Substitute must equal or exceed 900mW
• Gate Charge (Qg), Input Capacitance (Ciss), and Vgs(th): Variations permitted within device specifications

Regulatory & Compliance (Exact Match Required):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

All three substitute parts meet these criteria and are qualified for direct replacement in applications where the FDS6975 is specified.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: FDS6975 (onsemi)

The FDS6975 remains the preferred choice for new designs and ongoing production. This part is in active production status with substantial inventory availability (28,657 pcs), ensuring supply continuity and cost stability. The device meets all regulatory requirements including ROHS3 compliance and REACH unaffected status.

Direct Substitute: SI4925DDY-T1-GE3 (Vishay Siliconix)

The SI4925DDY-T1-GE3 is a qualified direct substitute offering superior electrical performance. This device provides 8A continuous drain current (compared to 6A in the FDS6975) with lower on-resistance (29 mOhm vs. 32 mOhm) and significantly higher power dissipation capability (5W vs. 900mW). The SI4925DDY-T1-GE3 is suitable for applications requiring enhanced thermal performance or higher current handling. This part is in active production status with 16,893 pcs in inventory.

Alternative Substitute: AO4813 (Alpha & Omega Semiconductor Inc.)

The AO4813 provides the lowest on-resistance specification (25 mOhm @ 7.1A, 10V) among all qualified substitutes, making it suitable for applications prioritizing minimal power dissipation. This device supports 7.1A continuous drain current and includes 2W power dissipation capability. The AO4813 is in active production status with the highest inventory availability (120,200 pcs), providing excellent supply assurance.

Secondary Substitute: AUIRF7316QTR (Infineon Technologies)

The AUIRF7316QTR is a qualified substitute with 2W power dissipation capability. This part is designated as Last Time Buy, indicating that Infineon has announced end-of-life status. While currently available (5,940 pcs in inventory), this option should be considered only for legacy system maintenance or when supply of primary alternatives is constrained. New designs should avoid this part due to its discontinued status.

Compliance & Regulatory Status

All four parts maintain identical compliance certifications: ROHS3 compliant, REACH unaffected, and MSL 1 (unlimited moisture sensitivity). All parts operate across the identical temperature range (-55°C to 150°C TJ), ensuring thermal compatibility in all specified applications.

Frequently Asked Questions (FAQ)

Q: Can the SI4925DDY-T1-GE3 be used as a direct replacement for the FDS6975 in existing designs?

A: Yes. The SI4925DDY-T1-GE3 meets all mandatory compatibility parameters including voltage rating (30V), package type (8-SOIC), configuration (2 P-Channel dual), and operating temperature range (-55°C to 150°C). The higher current rating (8A vs. 6A) and improved on-resistance (29 mOhm vs. 32 mOhm) provide enhanced performance margins. No circuit modifications are required.

Q: What is the primary difference between the AO4813 and the FDS6975?

A: The AO4813 offers lower on-resistance (25 mOhm vs. 32 mOhm) and higher continuous drain current (7.1A vs. 6A), resulting in reduced power dissipation in switching applications. Both devices share identical voltage ratings, package specifications, and operating temperature ranges. The AO4813 is preferred in applications where thermal management or efficiency is critical.

Q: Why is the AUIRF7316QTR marked as Last Time Buy?

A: The AUIRF7316QTR has been designated for discontinuation by Infineon Technologies. While currently available in inventory, this part should not be selected for new designs. Existing designs using this part should transition to alternative qualified substitutes to ensure long-term supply continuity.

Q: Are all substitute parts available in the same packaging options as the FDS6975?

A: All qualified substitutes are available in the 8-SOIC (0.154", 3.90mm Width) package, matching the FDS6975 mechanical specifications. Packaging format variations (Cut Tape, Digi-Reel, Tape & Reel) differ by supplier but do not affect electrical compatibility or PCB assembly compatibility.

Q: What is the significance of the Logic Level Gate feature?

A: Logic Level Gate indicates that the MOSFET is fully enhanced at standard logic voltage levels (typically 3.3V to 5V gate drive). This feature enables direct interface with digital logic circuits without requiring additional gate drive circuitry. The FDS6975, AUIRF7316QTR, and AO4813 all feature Logic Level Gate capability, ensuring compatible gate drive requirements.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Gate charge (Qg) and input capacitance (Ciss) specifications vary among the substitutes. The AO4813 offers the lowest gate charge (19 nC @ 10V), while the SI4925DDY-T1-GE3 has the highest (50 nC @ 10V). For applications operating above 1 MHz, gate charge differences may affect switching losses and driver current requirements. Verify gate drive circuit capability before substitution in high-frequency designs.

Q: What inventory considerations should guide part selection?

A: The AO4813 offers the highest inventory availability (120,200 pcs), providing maximum supply assurance. The FDS6975 (28,657 pcs) and SI4925DDY-T1-GE3 (16,893 pcs) maintain substantial stock levels. The AUIRF7316QTR (5,940 pcs) has the lowest availability and should be avoided for new designs due to its Last Time Buy status.

Q: Are all parts RoHS3 compliant and REACH unaffected?

A: Yes. All four parts maintain identical compliance certifications: ROHS3 compliant, REACH unaffected, and MSL 1 (unlimited). These certifications ensure compatibility with environmental regulations and supply chain requirements across all major markets.