TCP1.25-R Equivalent & Substitute Parts Reference

Part Overview

The TCP1.25-R is a 1.25A 250VAC rectangular surface mount fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. The part is designed for telecom applications requiring overcurrent protection in surface mount configurations.

Due to its obsolete status, identifying functionally equivalent substitute parts is essential for maintaining design continuity, supporting legacy systems, and ensuring supply chain reliability. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without design modification.

Substiute Parts

TCP1.25-R

Eaton - Electronics DivisionIn Stock: 2016TCP1.25-R Datasheet

Current PartRFQ

TR2/TCP1.25-R

Eaton - Electronics DivisionIn Stock: 3891TR2/TCP1.25-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TCP1.25-R are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following criteria:

Electrical Parameters (Must Match Exactly):

• Current Rating: 1.25A
• Voltage Rating - AC: 250 VAC
• Breaking Capacity @ Rated Voltage: 50A
• DC Cold Resistance: 0.09 Ohms
• Melting I²t: 22.2

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Size / Dimension: 0.405" L x 0.109" W x 0.109" H (10.29mm x 2.77mm x 2.77mm)

Regulatory Parameters (Must Match):

• Approval Agency: CSA, UR
• Series: TCP

The TR2/TCP1.25-R qualifies as a direct substitute because it maintains identical electrical ratings, mechanical dimensions, and regulatory certifications while offering active product status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

The TR2/TCP1.25-R is a direct functional equivalent to the TCP1.25-R and is suitable for substitution in all applications where the main part was originally specified.

Selection Basis:

1. Electrical Equivalence: All electrical parameters including current rating, voltage rating, breaking capacity, resistance, and thermal response characteristics are identical between the main part and substitute.

2. Mechanical Compatibility: Physical dimensions and surface mount package configuration are identical, ensuring compatibility with existing PCB layouts and assembly equipment without design modification.

3. Regulatory Compliance: Both parts carry identical CSA and UR approvals, maintaining compliance with applicable standards and certifications.

4. Product Availability: The TR2/TCP1.25-R maintains active product status with 3800 units in stock, compared to the obsolete TCP1.25-R with limited remaining inventory of 1964 units.

5. Packaging Consideration: The substitute is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly operations and provides improved handling and automated placement capabilities compared to standard packaging.

Frequently Asked Questions (FAQ)

Q: Can TR2/TCP1.25-R be used as a direct replacement for TCP1.25-R without circuit design changes?

A: Yes. The TR2/TCP1.25-R is electrically and mechanically identical to the TCP1.25-R. All electrical parameters, physical dimensions, and regulatory certifications match exactly. No circuit design modifications are required.

Q: What is the difference between TCP1.25-R and TR2/TCP1.25-R?

A: The primary difference is packaging format. TCP1.25-R uses standard packaging, while TR2/TCP1.25-R is supplied in Tape & Reel (TR) format. Additionally, TR2/TCP1.25-R has active product status with higher inventory availability. All electrical and mechanical specifications are identical.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts have identical dimensions of 0.405" L x 0.109" W x 0.109" H (10.29mm x 2.77mm x 2.77mm) and use the same 2-SMD, Square End Block package configuration. They are footprint-compatible with existing PCB designs.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both TCP1.25-R and TR2/TCP1.25-R carry CSA and UR approvals. Regulatory compliance is maintained when substituting between these parts.

Q: What is the significance of the Tape & Reel packaging for TR2/TCP1.25-R?

A: Tape & Reel (TR) packaging is the standard format for automated surface mount assembly operations. It provides improved component handling, faster placement speeds, and reduced manual intervention compared to standard packaging formats.

Q: Are the electrical protection characteristics identical?

A: Yes. Both parts have identical current ratings (1.25A), voltage ratings (250 VAC), breaking capacity (50A), DC cold resistance (0.09 Ohms), and melting I²t (22.2). Circuit protection performance is identical.

Q: Why is TR2/TCP1.25-R recommended over TCP1.25-R?

A: TR2/TCP1.25-R is recommended due to its active product status and higher inventory availability (3800 units versus 1964 units). Since all electrical and mechanical specifications are identical, the active substitute provides superior supply chain reliability for new designs and production continuity for existing applications.