FSB50450B Equivalent & Substitute Parts

Part Overview

The FSB50450B is a Power Driver Module MOSFET 3 Phase Inverter rated for 500V and 2.2A operation in a 23-PowerDIP Module package. This component is classified as Obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The module features 1500Vrms isolation voltage and is designed for through-hole mounting applications within the Motion SPM® 5 series.

Substiute Parts

FSB50450B

onsemiIn Stock: 1617FSB50450B Datasheet

Current PartRFQ

NFA50460R4B

onsemiIn Stock: 1316NFA50460R4B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSB50450B is determined by the following critical parameters:

• Package Compatibility: Both main and substitute parts must use the 23-PowerDIP Module (0.551", 14.00mm) form factor to ensure mechanical and electrical fit in existing PCB layouts
• Mounting Type: Through-hole mounting requirement must be maintained
• Configuration: 3 Phase Inverter topology must be preserved
• Isolation Voltage: Minimum 1500Vrms isolation voltage requirement
• Series Compatibility: Motion SPM® 5 series designation ensures functional alignment

The substitute part NFA50460R4B meets these criteria while offering enhanced electrical performance characteristics within the same physical and functional envelope.

Parameter Comparison

Engineering Selection Recommendations

The NFA50460R4B serves as the manufacturer-recommended substitute for the obsolete FSB50450B. Both components maintain identical package geometry, isolation voltage specifications, and mounting requirements, ensuring direct compatibility in existing designs.

The substitute part offers increased voltage headroom (600V versus 500V) and doubled current capacity (4A versus 2.2A), providing enhanced performance margins for 3 Phase Inverter applications. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying current regulatory requirements.

The transition from MOSFET to IGBT technology in the substitute part represents a functional upgrade within the Motion SPM® 5 series architecture. The active product status of NFA50460R4B ensures long-term availability and supply chain continuity compared to the obsolete FSB50450B.

Frequently Asked Questions (FAQ)

Q: Can NFA50460R4B be used as a direct replacement for FSB50450B in existing designs?

A: Yes. Both parts share identical package dimensions (23-PowerDIP Module, 0.551", 14.00mm), isolation voltage (1500Vrms), mounting type (through-hole), and 3 Phase Inverter configuration. PCB layout modifications are not required.

Q: What are the key differences between FSB50450B and NFA50460R4B?

A: The substitute part features higher voltage rating (600V versus 500V), increased current capacity (4A versus 2.2A), and uses IGBT technology instead of MOSFET. These represent performance enhancements within the same physical form factor.

Q: Are there compliance or certification differences between these parts?

A: Both parts maintain ROHS3 compliance, REACH unaffected status, and identical ECCN and HTSUS classifications. No compliance barriers exist for substitution.

Q: Why is FSB50450B classified as obsolete?

A: The FSB50450B has been discontinued by the manufacturer. NFA50460R4B is the active replacement offering superior electrical performance in the same package.

Q: Will the substitute part affect thermal management in my application?

A: Thermal characteristics are not provided in the specification data. Consult detailed datasheets for thermal resistance and junction temperature ratings specific to your application requirements.

Q: Are there any circuit design modifications needed when switching from FSB50450B to NFA50460R4B?

A: The identical package, isolation voltage, and 3 Phase Inverter configuration eliminate the need for PCB modifications. However, review device-specific datasheets for any gate drive or timing characteristic differences between MOSFET and IGBT technologies.