UMTS 1 Equivalent & Substitute Parts Reference

Part Overview

The UMTS 1 is a 1A 250VAC surface mount board fuse manufactured by Bel Fuse Inc. with slow blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The UMTS 1 features a 2-SMD square end block package and is approved by CE, cULus, and UMF standards.

Substiute Parts

UMTS 1

Bel Fuse Inc.In Stock: 905UMTS 1 Datasheet

Current PartRFQ

TR-1245UMFT1-R

Eaton - Electronics DivisionIn Stock: 3840TR-1245UMFT1-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The TR-1245UMFT1-R from Eaton - Electronics Division qualifies as a functional substitute for the UMTS 1 based on the following critical parameters:

• Current Rating: Both parts rated at 1 A
• Voltage Rating (AC): Both rated at 250 VAC
• Response Time: Both feature slow blow characteristics
• Mounting Type: Both are surface mount configurations
• Package / Case: Both use 2-SMD, Square End Block format
• Physical Dimensions: Equivalent form factor (12.10mm length, 4.45-4.50mm width and height)
• RoHS Compliance: Both ROHS3 compliant

The TR-1245UMFT1-R is currently in active production status, providing supply continuity for the obsolete UMTS 1.

Parameter Comparison

Engineering Selection Recommendations

The TR-1245UMFT1-R is the designated substitute for the obsolete UMTS 1. Both components meet identical electrical specifications for current and voltage ratings, response characteristics, and package configuration. The TR-1245UMFT1-R holds active product status with cURus approval certification, ensuring continued availability and regulatory compliance.

Design considerations include the TR-1245UMFT1-R's lower operating temperature minimum (-40°C versus -55°C) and reduced breaking capacity (100A versus 150A). These differences are acceptable for applications within the TR-1245UMFT1-R's specified operating range. The slightly higher DC cold resistance (0.118 Ohms versus 0.085 Ohms) represents a minor increase in voltage drop under normal operation.

Frequently Asked Questions (FAQ)

Q: Can the TR-1245UMFT1-R directly replace the UMTS 1 in existing designs?

A: Yes. Both components share identical current rating (1A), voltage rating (250VAC), response time (slow blow), mounting type (surface mount), and package format (2-SMD square end block). Physical dimensions are equivalent within manufacturing tolerances.

Q: What are the key differences between these parts?

A: The TR-1245UMFT1-R has a lower minimum operating temperature (-40°C versus -55°C), reduced breaking capacity (100A versus 150A), and slightly higher DC cold resistance (0.118 Ohms versus 0.085 Ohms). The UMTS 1 is obsolete while the TR-1245UMFT1-R is in active production.

Q: Are both parts RoHS compliant?

A: Yes. Both the UMTS 1 and TR-1245UMFT1-R are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level).

Q: What packaging options are available for the TR-1245UMFT1-R?

A: The TR-1245UMFT1-R is supplied in Tape & Reel (TR) format, whereas the UMTS 1 was available in Cut Tape (CT) and Digi-Reel packaging. Verify packaging requirements for your procurement process.

Q: Are there any certification differences?

A: The UMTS 1 carries CE, cULus, and UMF approvals. The TR-1245UMFT1-R carries cURus approval. Both meet the required regulatory standards for their respective applications.