SMP 2 Equivalent & Substitute Parts Reference

Part Overview

The SMP 2 is a 2A 600VAC/125VDC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block package. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The SMP 2 serves applications requiring fast-acting fuse protection in compact surface mount configurations with high AC voltage ratings.

Substiute Parts

SMP 2

Bel Fuse Inc.In Stock: 773SMP 2 Datasheet

Current PartRFQ

0461002.ER

Littelfuse Inc.In Stock: 201820461002.ER Datasheet

SimilarRFQ

46212000000

Littelfuse Inc.In Stock: 408746212000000 Datasheet

SimilarRFQ

TR2/TCP2-R

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMP 2 is determined by the following critical parameters:

• Current Rating: Must be 2A to maintain circuit protection characteristics
• Mounting Type: Must be Surface Mount to ensure PCB compatibility
• Package / Case: Must be 2-SMD, Square End Block for footprint compatibility
• Voltage Rating - AC: Must meet or exceed 600VAC
• Voltage Rating - DC: Must meet or exceed 125VDC
• Fuse Type: Must be Board Mount (Cartridge Style Excluded)
• Breaking Capacity: Must support minimum 60A AC and 100A DC at rated voltage

Three substitute parts meet these criteria with varying voltage and performance characteristics:

1. 0461002.ER (Littelfuse Inc.) - Meets current, mounting, and package requirements; AC voltage matches at 600VAC; DC voltage reduced to 80VDC
2. 46212000000 (Littelfuse Inc.) - Meets current, mounting, and package requirements; both AC and DC voltages reduced to 350V
3. TR2/TCP2-R (Eaton - Electronics Division) - Meets current, mounting, and package requirements; AC voltage reduced to 250VAC; DC voltage not specified

Parameter Comparison

Engineering Selection Recommendations

0461002.ER (Littelfuse Inc. Telelink® 461) is the primary substitute for applications operating at or below 80VDC. This part maintains the 600VAC rating of the original SMP 2 and is actively manufactured with CSA and UR approvals. The reduced DC voltage rating (80VDC vs. 125VDC) requires circuit verification if DC operation exceeds 80V. This part is available in high volume (20,100 pcs in stock) and carries RoHS3 compliance.

46212000000 (Littelfuse Inc. NANO²® 462) is suitable for applications operating at or below 350VAC and 350VDC. This part offers the highest breaking capacity (100A) and lowest DC cold resistance (0.0335 Ohms), making it suitable for circuits with tighter resistance budgets. UL, UMF, and VDE approvals provide broad regulatory coverage. The significantly reduced voltage ratings require full circuit re-evaluation.

TR2/TCP2-R (Eaton - Electronics Division TCP) is suitable for applications operating at or below 250VAC. This part has the lowest breaking capacity (50A) and highest DC cold resistance (0.075 Ohms) among the substitutes. CSA and UR approvals are provided. The unspecified DC voltage rating and reduced AC voltage require comprehensive circuit analysis before selection.

All three substitutes share identical current rating (2A), mounting type (Surface Mount), and package configuration (2-SMD, Square End Block) with the SMP 2, ensuring mechanical and electrical footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can 0461002.ER replace SMP 2 in all applications? A: 0461002.ER is mechanically and electrically compatible for applications operating at 600VAC or below and 80VDC or below. If the original circuit operates above 80VDC, this substitute is not suitable without circuit modification.

Q: What is the primary difference between the three substitutes? A: The three substitutes differ primarily in voltage ratings and breaking capacity. 0461002.ER maintains the 600VAC rating of the original part. 46212000000 and TR2/TCP2-R have reduced AC voltage ratings (350VAC and 250VAC respectively) but offer different DC voltage capabilities and breaking capacities.

Q: Are all substitutes RoHS compliant? A: 0461002.ER and 46212000000 are RoHS3 compliant. TR2/TCP2-R is RoHS compliant. All three meet REACH requirements (REACH Unaffected status).

Q: Does package size differ between the main part and substitutes? A: All parts use the 2-SMD, Square End Block package. Minor dimensional variations exist: SMP 2 is 0.380" L x 0.120" W x 0.120" H; 0461002.ER is 0.398" L x 0.123" W x 0.123" H; 46212000000 is 0.413" L x 0.177" W x 0.177" H; TR2/TCP2-R is 0.405" L x 0.109" W x 0.109" H. Verify PCB footprint compatibility before design implementation.

Q: Which substitute has the fastest response time? A: 0461002.ER and 46212000000 are specified as Slow Blow fuses. TR2/TCP2-R response time is not specified in available data. Response time selection depends on circuit protection requirements.

Q: What approvals are required for my application? A: Approval requirements depend on end-use application and regional regulations. 0461002.ER carries CSA and UR approvals. 46212000000 carries UL, UMF, and VDE approvals. TR2/TCP2-R carries CSA and UR approvals. Verify that the selected substitute meets all applicable regulatory requirements for your specific application.