Equivalent & Substitute Parts for 0461002.ERT

Part Overview

The 0461002.ERT is a 2A 250VAC board mount surface mount fuse manufactured by Littelfuse Inc., part of the Nano²® Telelink® 461 series. This component is classified as obsolete, necessitating identification of active alternative parts that maintain functional and mechanical compatibility for telecom applications. Substitute parts must preserve the 2A current rating, board mount configuration, and 2-SMD square end block package while accommodating updated voltage ratings and compliance requirements.

Substiute Parts

0461002.ERT

Littelfuse Inc.In Stock: 7400461002.ERT Datasheet

Current PartRFQ

0461002.ER

Littelfuse Inc.In Stock: 201820461002.ER Datasheet

DirectRFQ

04611.25ER

Littelfuse Inc.In Stock: 23980204611.25ER Datasheet

DirectRFQ

TR2/TCP2-R

Eaton - Electronics DivisionIn Stock: 846TR2/TCP2-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0461002.ERT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Current Rating: 2A (exact match required)
• Mounting Type: Surface Mount
• Fuse Type: Board Mount
• Package / Case: 2-SMD, Square End Block
• Operating Temperature Range: -55°C ~ 125°C
• Approval Agencies: CSA, UR certification

Secondary Compatibility Criteria:

• Voltage Rating: Minimum 250VAC (higher ratings acceptable for backward compatibility)
• Response Time: Slow Blow
• Physical Dimensions: 2-SMD square end block configuration

The substitute parts identified maintain the 2A current rating and board mount surface mount configuration. The 0461002.ER variant from Littelfuse provides enhanced voltage ratings (600VAC/80VDC) while preserving all mechanical and thermal specifications. The TR2/TCP2-R from Eaton represents a cross-manufacturer alternative with identical voltage and current specifications.

Parameter Comparison

Engineering Selection Recommendations

0461002.ER (Littelfuse Inc.) is the primary substitute for the obsolete 0461002.ERT. This part maintains identical current rating (2A), mechanical configuration, and thermal operating range while providing enhanced voltage capability (600VAC/80VDC versus 250VAC). The 0461002.ER holds active product status and achieves ROHS3 compliance, addressing regulatory requirements that the original part does not meet. Identical DC cold resistance (0.05 Ohms) and melting I²t (17.5) ensure equivalent electrical performance in the circuit. This part is available in Tape & Reel packaging with substantial inventory (20,100 pcs).

TR2/TCP2-R (Eaton - Electronics Division) provides a cross-manufacturer alternative with matching voltage (250VAC) and current (2A) specifications. This part maintains CSA and UR approvals and achieves RoHS compliance. Physical dimensions differ slightly (0.405" L x 0.109" W x 0.109" H versus 0.398" L x 0.123" W x 0.123" H), requiring PCB layout verification. DC cold resistance is higher at 0.075 Ohms compared to 0.05 Ohms. This option is suitable when manufacturer diversification is required.

The 04611.25ER variant (1.25A rating) is not recommended as a direct substitute due to reduced current rating, which does not satisfy the 2A requirement of the original circuit design.

Frequently Asked Questions (FAQ)

Q: Can the 0461002.ER directly replace the 0461002.ERT without PCB modifications?

A: Yes. The 0461002.ER maintains identical physical dimensions (0.398" L x 0.123" W x 0.123" H), package configuration (2-SMD square end block), and mounting type (surface mount). No PCB layout changes are required. The enhanced voltage rating (600VAC versus 250VAC) provides backward compatibility with the original 250VAC circuit requirement.

Q: What is the primary advantage of selecting 0461002.ER over the original 0461002.ERT?

A: The 0461002.ER is an active product with ROHS3 compliance and higher inventory availability (20,100 pcs versus 653 pcs for the obsolete part). It provides identical electrical performance (2A, slow blow response, 0.05 Ohms DC resistance) while supporting modern regulatory requirements.

Q: Can the TR2/TCP2-R be used as a substitute?

A: The TR2/TCP2-R is mechanically and electrically compatible for 250VAC 2A applications. However, physical dimensions differ slightly (0.405" L x 0.109" W x 0.109" H), requiring verification that the component fits within the PCB footprint. DC cold resistance is 0.075 Ohms versus 0.05 Ohms, which may affect circuit performance in applications sensitive to fuse resistance.

Q: Why is the 04611.25ER not recommended as a substitute?

A: The 04611.25ER has a reduced current rating of 1.25A, which does not meet the 2A requirement of the original design. Using an undersized fuse creates a safety hazard and circuit malfunction risk.

Q: What packaging options are available for substitute parts?

A: The 0461002.ER is supplied in Tape & Reel (TR) packaging. The TR2/TCP2-R is available in Tape & Reel (TR) packaging. Both formats are suitable for automated assembly processes.

Q: Are all substitute parts certified by CSA and UR?

A: Yes. The 0461002.ER and TR2/TCP2-R both carry CSA and UR approvals, maintaining compliance with the original part's certification requirements.