FSB50550UTD Equivalent & Substitute Parts

Part Overview

The FSB50550UTD is a Power Driver Module MOSFET manufactured by onsemi, designed for 3-phase applications with 500V voltage rating and 2A current capacity in a 23-PowerDIP Through Hole package. This component is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain compatibility across electrical specifications, isolation voltage, and mounting characteristics while accounting for packaging and current rating variations.

Substiute Parts

FSB50550UTD

onsemiIn Stock: 4653FSB50550UTD 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 FSB50550UTD are identified based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

• Voltage Rating: 500V or higher
• Isolation Voltage: 1500Vrms minimum
• Configuration: 3-phase capability
• Series: Motion SPM® 5 family
• RoHS Compliance: ROHS3 Compliant

Secondary Considerations:

• Current Rating: Equal to or greater than 2A
• Mounting Type: Through Hole preferred for direct replacement; Surface Mount requires board redesign
• Package compatibility: PowerDIP module form factor

Two substitute parts meet these criteria with varying trade-offs in current capacity, mounting technology, and product status.

Parameter Comparison

Engineering Selection Recommendations

FSB50550B (Preferred for Direct Replacement): FSB50550B maintains identical voltage rating (500V), Through Hole mounting, and PowerDIP package form factor. Current rating increases from 2A to 3A, providing design margin. Both parts share Obsolete status within the Motion SPM® 5 series. Package dimensions differ (14.00mm vs. 19.00mm), requiring PCB layout verification. ROHS3 compliance and 1500Vrms isolation voltage are maintained.

NFA50460R47 (Active Alternative with Trade-offs): NFA50460R47 is the only Active product among the three options, ensuring long-term availability and supply chain stability. Voltage rating increases to 600V with current capacity of 4A, both exceeding original specifications. Transition from MOSFET to IGBT technology and Surface Mount packaging necessitates circuit evaluation and board redesign. Moisture Sensitivity Level increases to MSL 3 (168 Hours), affecting storage and handling protocols.

Frequently Asked Questions (FAQ)

Q: Can FSB50550B be used as a direct drop-in replacement for FSB50550UTD? A: FSB50550B shares the same voltage rating (500V), isolation voltage (1500Vrms), Through Hole mounting, and PowerDIP package family. However, package dimensions differ (14.00mm vs. 19.00mm), requiring PCB footprint verification before implementation. Current rating increases from 2A to 3A.

Q: What are the implications of using NFA50460R47 as a substitute? A: NFA50460R47 introduces three significant changes: voltage rating increases to 600V, mounting changes from Through Hole to Surface Mount (requiring board redesign), and device type changes from MOSFET to IGBT. The advantage is Active product status, ensuring continued availability. Moisture Sensitivity Level increases to MSL 3.

Q: Are all substitute parts ROHS3 compliant? A: Yes. FSB50550UTD, NFA50460R47, and FSB50550B are all ROHS3 Compliant with identical isolation voltage of 1500Vrms.

Q: What is the impact of changing from MOSFET to IGBT technology? A: NFA50460R47 uses IGBT technology versus MOSFET in the original part. This affects switching characteristics, gate drive requirements, and thermal behavior. Circuit-level evaluation is required to confirm compatibility.

Q: How does the Moisture Sensitivity Level affect component handling? A: FSB50550UTD has MSL 1 (Unlimited storage), while NFA50460R47 has MSL 3 (168 Hours maximum exposure to 85°C/85% RH before reflow). FSB50550B lists MSL as Not Applicable. Storage and assembly procedures must align with the selected substitute's MSL rating.

Q: Which substitute offers the best long-term supply availability? A: NFA50460R47 is classified as Active, indicating ongoing production and supply chain support. FSB50550UTD and FSB50550B are both Obsolete, with limited inventory availability.