FCD061250TP Equivalent & Substitute Parts Reference

Part Overview

The FCD061250TP is a 2.5A surface mount board mount fuse rated for 32VDC operation in 0603 (1608 Metric) package format. Manufactured by Littelfuse Inc., this component is classified as obsolete product status. Due to its obsolete designation, locating direct inventory may present supply chain challenges, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring compatible 2.5A fuse functionality at 32VDC ratings.

Substiute Parts

FCD061250TP

Littelfuse Inc.In Stock: 879FCD061250TP Datasheet

Current PartRFQ

043802.5WR

Littelfuse Inc.In Stock: 4138043802.5WR Datasheet

DirectRFQ

046702.5NR

Littelfuse Inc.In Stock: 17260046702.5NR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FCD061250TP are qualified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating - DC: 32 V (minimum requirement)
• Package / Case: 0603 (1608 Metric) (physical form factor match)
• Fuse Type: Board Mount (Cartridge Style Excluded) (mounting configuration)
• Mounting Type: Surface Mount (assembly compatibility)
• Response Time: Fast Blow (electrical characteristic)

Secondary Considerations:

• RoHS3 Compliance (regulatory requirement)
• Approval Agency certifications (UL, CSA, cULus)
• Operating temperature range
• Breaking capacity at rated voltage

Two substitute parts meet these criteria with varying degrees of parameter alignment to the original FCD061250TP specification.

Parameter Comparison

Engineering Selection Recommendations

046702.5NR (Manufacturer Recommended Substitute)

The 046702.5NR is the primary recommended substitute for FCD061250TP applications. This part maintains identical current rating (2.5A), DC voltage rating (32V), package format (0603), and fuse response characteristic (Fast Blow). The 046702.5NR holds active product status, ensuring long-term supply chain availability. It carries CSA and UL approvals, meeting regulatory compliance requirements. The extended AC voltage rating (32V AC vs. no AC specification on FCD061250TP) provides additional operational flexibility. Breaking capacity matches the original specification at 35A. The narrower operating temperature range (-55°C to 90°C versus -55°C to 125°C) must be evaluated against specific application thermal requirements.

043802.5WR (Alternative Substitute)

The 043802.5WR meets all primary compatibility criteria with identical current rating, DC voltage rating, package, and response time. This part carries CSA and UL approvals. The higher breaking capacity (50A versus 35A) provides enhanced fault protection margin. The extended operating temperature range (-55°C to 150°C) accommodates higher thermal environments. However, 043802.5WR maintains obsolete product status, presenting potential long-term supply constraints. The AC voltage rating (12V AC) differs from the original specification. Selection of this substitute should account for supply availability and thermal operating conditions specific to the application.

Frequently Asked Questions (FAQ)

Q: Can 046702.5NR directly replace FCD061250TP in existing designs?

A: Yes. Both parts share identical current rating (2.5A), DC voltage rating (32V), package format (0603), mounting type (surface mount), and fuse response characteristic (fast blow). Physical dimensions and electrical performance are compatible for direct substitution in board-level applications.

Q: What is the significance of the different AC voltage ratings between substitutes?

A: The FCD061250TP carries no AC voltage specification. The 046702.5NR is rated for 32V AC/DC operation, while 043802.5WR is rated for 12V AC/32V DC. For DC-only applications, both substitutes function identically. For applications requiring AC voltage protection, 046702.5NR provides equivalent AC/DC capability at 32V.

Q: Why is 046702.5NR recommended over 043802.5WR?

A: The 046702.5NR maintains active product status, ensuring sustained manufacturing and supply availability. Both parts meet electrical compatibility requirements; however, active status provides superior long-term supply chain reliability for production applications.

Q: Are there thermal operating range differences that affect selection?

A: Yes. The FCD061250TP operates from -55°C to 125°C. The 046702.5NR operates from -55°C to 90°C, while 043802.5WR operates from -55°C to 150°C. Applications requiring operation above 90°C should specify 043802.5WR or evaluate the original FCD061250TP if available. Applications within the 046702.5NR range encounter no thermal limitations.

Q: Do all three parts carry equivalent regulatory approvals?

A: The FCD061250TP carries cULus approval. Both 046702.5NR and 043802.5WR carry CSA and UL approvals. All three parts are ROHS3 compliant. For applications requiring specific approval agency certification, verify that the selected substitute meets regional regulatory requirements.

Q: What is the impact of different melting I²t values?

A: Melting I²t characterizes the thermal energy required to melt the fuse element. FCD061250TP: 0.08, 043802.5WR: 0.1977, 046702.5NR: 0.2066. Higher I²t values indicate slower thermal response to overcurrent conditions. For applications with specific transient current tolerance requirements, these differences may be significant. Consult application circuit analysis to determine acceptable I²t range.

Q: Can these fuses be used interchangeably in automated assembly?

A: Yes. All three parts share identical package format (0603), mounting type (surface mount), and physical footprint compatibility. No design modifications or assembly process changes are required for substitution.