FSB50325AS Equivalent & Substitute Parts

Part Overview

The FSB50325AS is a Power Driver Module MOSFET manufactured by onsemi, designed for 3-phase applications with a rated voltage of 250 V and current capacity of 1.7 A. This component is packaged in a 23-PowerSMD Module with Gull Wing, 21 Leads configuration for surface mount applications.

The FSB50325AS has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this module.

Substiute Parts

FSB50325AS

onsemiIn Stock: 910FSB50325AS Datasheet

Current PartRFQ

NFA50460R47

onsemiIn Stock: 1630NFA50460R47 Datasheet

SimilarRFQ

FSB50550B

onsemiIn Stock: 1698FSB50550B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FSB50325AS are identified based on the following criteria:

Common Parameters (Required for Substitution):

• Manufacturer: onsemi
• Series: Motion SPM® 5
• Configuration: 3 Phase
• Voltage - Isolation: 1500 Vrms
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

Allowable Parameter Variations:

• Voltage Rating: May be higher than 250 V (backward compatible for lower voltage applications)
• Current Rating: May be higher than 1.7 A (provides additional capacity margin)
• Type: May differ (MOSFET or IGBT technology acceptable within same series)
• Mounting Type: May differ (Surface Mount or Through Hole, depending on PCB design capability)
• Package / Case: May differ (alternative PowerSMD or PowerDIP modules within Motion SPM® 5 series)
• Product Status: Active status preferred over Obsolete for long-term availability

Parameter Comparison

Engineering Selection Recommendations

NFA50460R47 is the primary substitute candidate. This part maintains active product status, ensuring long-term availability and supply chain stability. It belongs to the same Motion SPM® 5 series and meets all isolation and compliance requirements. The higher voltage (600 V) and current (4 A) ratings provide operational margin for the 250 V, 1.7 A application. The IGBT technology is functionally compatible within the 3-phase inverter configuration. Surface mount packaging maintains PCB design compatibility.

FSB50550B is a secondary substitute option. While it shares the same series and compliance standards, its obsolete product status limits its suitability for new designs or long-term production. The through-hole mounting type requires PCB redesign if the original surface-mount configuration is retained. The 500 V, 3 A ratings remain compatible with the original application requirements.

For new designs or sustained production, NFA50460R47 is the recommended selection due to active product status and proven availability.

Frequently Asked Questions (FAQ)

Q: Can NFA50460R47 directly replace FSB50325AS without PCB modifications?

A: NFA50460R47 maintains surface mount packaging and the same 21-lead configuration within the Motion SPM® 5 series. Pin compatibility and footprint alignment must be verified against the original design documentation. The higher voltage and current ratings are backward compatible with the 250 V, 1.7 A application.

Q: What is the impact of switching from MOSFET (FSB50325AS) to IGBT (NFA50460R47) technology?

A: Both technologies are acceptable within the Motion SPM® 5 series for 3-phase inverter applications. IGBT devices typically exhibit different switching characteristics and thermal behavior. System-level performance validation is required to confirm compatibility with existing gate drive circuits and thermal management infrastructure.

Q: Why is FSB50550B listed as a substitute if it is also obsolete?

A: FSB50550B is provided as a reference point for applications where through-hole mounting is feasible or preferred. Its obsolete status makes it unsuitable for new production. NFA50460R47 is the recommended active alternative.

Q: Are there packaging considerations when substituting FSB50325AS?

A: FSB50325AS uses 23-PowerSMD Module, Gull Wing, 21 Leads packaging. NFA50460R47 maintains the same surface-mount approach. FSB50550B requires through-hole PCB design, necessitating layout modifications. Verify footprint compatibility and solder reflow profiles for surface-mount alternatives.

Q: Do all substitute parts meet the same compliance and regulatory requirements?

A: Yes. FSB50325AS, NFA50460R47, and FSB50550B are all ROHS3 Compliant, REACH Unaffected, and rated for 1500 Vrms isolation. Moisture sensitivity levels differ; verify handling and storage requirements for your manufacturing environment.