UMTS 2.5 Equivalent & Substitute Parts

Part Overview

The UMTS 2.5 is a 2.5A 250VAC surface mount board fuse manufactured by Bel Fuse Inc. with slow blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part features a 2-SMD square end block package and is suitable for electrical and industrial applications requiring board-level fuse protection.

Substiute Parts

UMTS 2.5

Bel Fuse Inc.In Stock: 1066UMTS 2.5 Datasheet

Current PartRFQ

0683G2500-01

Bel Fuse Inc.In Stock: 20490683G2500-01 Datasheet

SimilarRFQ

TR-1245UMFT2-5-R

Eaton - Electronics DivisionIn Stock: 3881TR-1245UMFT2-5-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the UMTS 2.5 is determined by the following critical parameters:

Primary Matching Criteria:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating - AC: 250 V (minimum requirement)
• Response Time: Slow Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block

Secondary Compatibility Factors:

• Operating Temperature Range: -55°C ~ 125°C or compatible overlap
• Breaking Capacity: 100A or greater
• Melting I²t: 7.5 to 15 range
• DC Cold Resistance: ≤0.038 Ohms
• RoHS3 Compliance

Two substitute parts meet these criteria with varying degrees of parameter alignment:

0683G2500-01 (Bel Fuse Inc.): Matches current rating, mounting type, and package. Exceeds AC voltage rating at 350V. Ceramic cartridge construction. Active product status.

TR-1245UMFT2-5-R (Eaton - Electronics Division): Matches current rating, AC voltage rating, response time, mounting type, and package. Board mount fuse type. Active product status.

Parameter Comparison

Engineering Selection Recommendations

TR-1245UMFT2-5-R (Eaton - Electronics Division) is the primary substitute for UMTS 2.5 applications. This part maintains exact AC voltage rating (250VAC), identical current rating (2.5A), matching response time (Slow Blow), and compatible package geometry (2-SMD, Square End Block). Physical dimensions are within 0.002" tolerance on width and height. Melting I²t value matches the original specification at 15. DC cold resistance is superior at 0.033 Ohms. The part holds active product status with cURus certification. Operating temperature range extends to -40°C minimum, which covers the majority of industrial applications within the original -55°C specification.

0683G2500-01 (Bel Fuse Inc.) serves as a secondary substitute where elevated AC voltage rating (350V) is acceptable or beneficial. This ceramic cartridge fuse maintains identical current rating and package type. The part includes DC voltage rating (125V) not specified in the original UMTS 2.5. Melting I²t is reduced to 7.5, indicating faster thermal response. Breaking capacity is reduced to 100A AC. This part is suitable for applications where overvoltage protection margin is required or where DC component presence is anticipated.

Both substitutes maintain ROHS3 compliance and are available in active product status, ensuring long-term procurement viability.

Frequently Asked Questions (FAQ)

Q: Can TR-1245UMFT2-5-R directly replace UMTS 2.5 in existing designs?

A: Yes. TR-1245UMFT2-5-R matches the critical electrical parameters: 2.5A current rating, 250VAC voltage rating, slow blow response, and 2-SMD square end block package. Physical dimensions are within manufacturing tolerance. No circuit redesign is required.

Q: What is the primary difference between the two substitute options?

A: TR-1245UMFT2-5-R maintains exact voltage and current specifications with matching melting I²t. 0683G2500-01 provides higher AC voltage rating (350V) and includes DC voltage rating (125V) but has reduced melting I²t (7.5 vs 15) and lower breaking capacity (100A vs 150A).

Q: Is the 0.002" dimensional difference between UMTS 2.5 and TR-1245UMFT2-5-R significant?

A: No. The width and height differences (0.175" vs 0.177") fall within standard PCB pad tolerance and component placement accuracy for surface mount assembly. Footprint compatibility is maintained.

Q: Does operating temperature range affect substitution suitability?

A: TR-1245UMFT2-5-R operates from -40°C to 125°C, compared to UMTS 2.5 at -55°C to 125°C. For applications requiring operation below -40°C, design verification is necessary. Most industrial and commercial applications operate within the -40°C minimum threshold.

Q: Are both substitutes RoHS3 compliant?

A: Yes. Both TR-1245UMFT2-5-R and 0683G2500-01 are ROHS3 compliant, matching the original UMTS 2.5 environmental specification.

Q: What certifications should be verified for regulatory compliance?

A: UMTS 2.5 holds CE, cULus, and UMF certifications. TR-1245UMFT2-5-R holds cURus certification. 0683G2500-01 holds CE and cURus certifications. Verify that substitute certifications meet your application's regulatory requirements before implementation.

Q: Can 0683G2500-01 be used in applications requiring DC voltage protection?

A: 0683G2500-01 includes 125V DC rating, making it suitable for mixed AC/DC applications. UMTS 2.5 does not specify DC voltage rating. If DC component protection is required, 0683G2500-01 provides this capability.