FSB50325AT Equivalent & Substitute Parts

Part Overview

The FSB50325AT is a Power Driver Module manufactured by onsemi, featuring a 3-phase MOSFET configuration rated for 250V and 1.7A operation. This component is part of the Motion SPM® 5 series and is packaged in a 23-PowerDIP Module form factor suitable for through-hole mounting applications.

The FSB50325AT has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this module.

Substiute Parts

FSB50325AT

onsemiIn Stock: 2133FSB50325AT 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 FSB50325AT are identified based on the following criteria:

Primary Substitution Parameters:

• Manufacturer: onsemi (same manufacturer ensures design compatibility and support continuity)
• Series: Motion SPM® 5 (same product family maintains electrical and mechanical interface standards)
• Configuration: 3 Phase (functional topology requirement)
• Voltage - Isolation: 1500Vrms (isolation specification must be maintained)
• RoHS Status: ROHS3 Compliant (regulatory compliance requirement)

Allowable Variations:

• Voltage Rating: May be equal to or higher than 250V (higher voltage rating provides operational margin)
• Current Rating: May be equal to or higher than 1.7A (higher current rating provides design flexibility)
• Type: MOSFET or IGBT (both are semiconductor switching devices within the SPM® 5 family)
• Mounting Type: Through Hole or Surface Mount (both are acceptable for system integration)
• Product Status: Active or Obsolete (both are available for procurement)

Parameter Comparison

Engineering Selection Recommendations

NFA50460R47 Substitution Considerations: This part offers the highest voltage and current ratings (600V, 4A) and maintains active product status, ensuring long-term availability and manufacturer support. The IGBT type provides different switching characteristics compared to the MOSFET configuration of the main part. Surface mount packaging requires PCB redesign if through-hole mounting is required in the original application.

FSB50550B Substitution Considerations: This part maintains MOSFET type consistency with the main part and through-hole mounting compatibility. The 500V and 3A ratings provide operational margin above the original 250V and 1.7A specifications. Package dimensions differ (0.551" versus 0.748"), requiring mechanical verification for board layout compatibility. Product status is obsolete, similar to the main part.

Both substitute parts maintain the Motion SPM® 5 series designation, 1500Vrms isolation rating, and ROHS3 compliance required for regulatory and design continuity purposes.

Frequently Asked Questions (FAQ)

Q: Can NFA50460R47 directly replace FSB50325AT in existing designs? A: NFA50460R47 is electrically compatible as a substitute within the Motion SPM® 5 family and meets isolation and compliance requirements. However, it uses Surface Mount packaging versus Through Hole, requiring PCB redesign. The IGBT type differs from the MOSFET configuration, which may affect switching performance characteristics.

Q: What are the mechanical compatibility concerns with FSB50550B? A: FSB50550B uses a 23-PowerDIP Module with 0.551" (14.00mm) dimensions, compared to FSB50325AT's 0.748" (19.00mm) package. Board layout and mounting hole spacing must be verified for mechanical fit before implementation.

Q: Why is voltage rating higher in substitute parts? A: Higher voltage ratings (500V and 600V) provide operational margin and design flexibility. These parts remain suitable for 250V applications while offering protection against voltage transients and supporting higher-voltage system variants.

Q: Are all substitute parts ROHS3 compliant? A: Yes. Both NFA50460R47 and FSB50550B maintain ROHS3 compliance, ensuring regulatory alignment with the original FSB50325AT specification.

Q: What is the difference between MOSFET and IGBT types in the SPM® 5 series? A: Both are semiconductor switching devices within the Motion SPM® 5 family. MOSFET and IGBT types have different switching speed and conduction loss characteristics. Selection depends on application-specific performance requirements.

Q: Should product status (Active vs. Obsolete) influence substitution decisions? A: Active status (NFA50460R47) indicates ongoing manufacturer support and long-term availability. Obsolete status (FSB50550B) may present future supply constraints. For new designs or long-term production, active parts are preferred.