FSB70325 Equivalent & Substitute Parts

Part Overview

The FSB70325 is a Power Driver Module MOSFET from onsemi's Motion SPM® 7 series, designed for 3-phase motor control applications. This module integrates gate driver and power switching functionality in a 27-PowerLQFN surface-mount package. The FSB70325 is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

FSB70325

onsemiIn Stock: 1395FSB70325 Datasheet

Current PartRFQ

FSB70550

Fairchild SemiconductorIn Stock: 1325FSB70550 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSB70325 is determined by the following critical parameters:

• Package Compatibility: 27-PowerLQFN Module form factor
• Configuration: 3-phase MOSFET driver topology
• Isolation Voltage: 1500Vrms minimum
• Mounting Type: Surface mount technology
• Series Compatibility: Motion SPM® 7 family

The FSB70550 qualifies as a direct substitute based on matching package, configuration, isolation voltage, and mounting type. While the FSB70550 features higher voltage (500 V) and current (5.3 A) ratings compared to the FSB70325 (250 V, 4.1 A), these enhanced specifications provide design margin and are compatible with applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The FSB70550 is the designated substitute for the obsolete FSB70325. Both parts maintain identical package geometry, electrical isolation, and 3-phase configuration. The FSB70550's active product status ensures long-term availability and supply chain continuity. The higher voltage and current specifications of the FSB70550 (500 V / 5.3 A versus 250 V / 4.1 A) are compatible with applications originally designed for the FSB70325, as the substitute provides enhanced performance margins without requiring circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can FSB70550 directly replace FSB70325 in existing designs? A: Yes. Both parts share identical package geometry (27-PowerLQFN Module), isolation voltage (1500Vrms), and 3-phase configuration. The FSB70550's higher ratings provide design margin.

Q: What are the key differences between FSB70325 and FSB70550? A: The FSB70550 features higher voltage (500 V vs. 250 V) and current (5.3 A vs. 4.1 A) ratings. The FSB70550 is active, while the FSB70325 is obsolete.

Q: Are there any package or pinout differences? A: No. Both parts use the 27-PowerLQFN Module package with identical form factor and mounting requirements.

Q: Why is the FSB70325 obsolete? A: Product obsolescence is determined by manufacturer lifecycle decisions. The FSB70550 provides equivalent functionality with enhanced specifications.

Q: What compliance certifications apply to these parts? A: FSB70325 is ROHS3 compliant. Both parts carry EAR99 export classification and are REACH unaffected.