FSB50650BS Equivalent & Substitute Parts

Part Overview

The FSB50650BS is a Power Driver Module MOSFET 3 Phase Inverter rated for 500 V and 4 A operation in a 23-PowerSMD Module, Gull Wing surface mount package. This component is part of the Motion SPM® 5 series from onsemi and is currently classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for system redesign, maintenance, and procurement planning. The substitute identified maintains core electrical specifications while offering improved availability through active product status.

Substiute Parts

FSB50650BS

onsemiIn Stock: 908FSB50650BS Datasheet

Current PartRFQ

NFA50460R4B

onsemiIn Stock: 1316NFA50460R4B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSB50650BS is determined by the following critical electrical and mechanical parameters:

• Configuration: 3 Phase Inverter topology must be maintained
• Current Rating: 4 A minimum capability required
• Voltage Isolation: 1500 Vrms isolation specification
• Series Compatibility: Motion SPM® 5 series from onsemi
• Regulatory Compliance: ROHS3 and REACH compliance maintained

The identified substitute, NFA50460R4B, satisfies these core requirements while operating at a higher voltage rating (600 V vs. 500 V), which provides additional design margin. The primary trade-off involves a change from surface mount (23-PowerSMD Module, Gull Wing) to through-hole mounting (23-PowerDIP Module), which requires PCB layout modification but maintains electrical equivalence for the 3 Phase Inverter application.

Parameter Comparison

Engineering Selection Recommendations

The NFA50460R4B serves as the primary substitute for the obsolete FSB50650BS based on the following factors:

• Product Availability: The substitute maintains active production status, ensuring long-term procurement viability compared to the obsolete original part.
• Electrical Equivalence: Both components maintain identical 4 A current rating, 1500 Vrms isolation voltage, and 3 Phase Inverter configuration. The 600 V rating of the substitute exceeds the 500 V requirement, providing additional voltage margin without compromising application performance.
• Regulatory Compliance: Both parts maintain ROHS3 and REACH compliance, ensuring compatibility with current environmental and regulatory standards.
• Series Continuity: Both components belong to the Motion SPM® 5 series, confirming manufacturer-level compatibility within the product family.

The primary design consideration involves the transition from surface mount to through-hole packaging, which necessitates PCB layout modification but does not affect electrical performance in the 3 Phase Inverter application.

Frequently Asked Questions (FAQ)

Q: Can NFA50460R4B directly replace FSB50650BS without PCB modification?

A: No. The FSB50650BS uses surface mount packaging (23-PowerSMD Module, Gull Wing), while the NFA50460R4B requires through-hole mounting (23-PowerDIP Module). PCB layout changes are necessary to accommodate the different form factor and pin configuration.

Q: Does the higher 600 V rating of NFA50460R4B affect circuit performance?

A: No. The 600 V rating of the substitute exceeds the 500 V system requirement, providing additional voltage margin. This higher rating does not degrade performance in applications designed for 500 V operation.

Q: Are both parts from the same manufacturer?

A: Yes. Both FSB50650BS and NFA50460R4B are manufactured by onsemi and belong to the Motion SPM® 5 series, confirming manufacturer-level compatibility.

Q: What is the impact of the mounting type change?

A: The change from surface mount to through-hole mounting requires PCB redesign to accommodate different pin spacing and hole placement. Electrical performance remains equivalent for the 3 Phase Inverter application.

Q: Are there any compliance differences between the two parts?

A: No. Both components maintain identical ROHS3 and REACH compliance status, ensuring regulatory equivalence.

Q: Why is the original part obsolete?

A: The FSB50650BS is classified as obsolete by the manufacturer. The NFA50460R4B, as an active product, represents the current production alternative within the Motion SPM® 5 series.