SMP 500 Equivalent & Substitute Parts

Part Overview

The SMP 500 is a 500 mA surface mount board mount fuse rated for 600 V AC and 125 V DC operation, manufactured by Bel Fuse Inc. in the SMP series. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning. Substitute parts must maintain the same current rating, compatible voltage specifications, and surface mount package configuration to ensure direct replacement capability.

Substiute Parts

SMP 500

Bel Fuse Inc.In Stock: 1110SMP 500 Datasheet

Current PartRFQ

0461.500ER

Littelfuse Inc.In Stock: 198420461.500ER Datasheet

SimilarRFQ

46205000000

Littelfuse Inc.In Stock: 472546205000000 Datasheet

SimilarRFQ

TR2/TCP500-R

Eaton - Electronics DivisionIn Stock: 7913TR2/TCP500-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMP 500 is determined by the following criteria:

Primary Compatibility Requirements:

• Current rating must equal 500 mA
• Mounting type must be surface mount
• Package configuration must be 2-SMD, Square End Block or mechanically compatible alternative
• Voltage ratings must meet or exceed both AC (600 V) and DC (125 V) specifications

Secondary Considerations:

• Breaking capacity at rated voltage
• DC cold resistance
• Approval agency certifications (CE, cURus, CSA, UR, UL)
• Moisture sensitivity level (MSL 1 preferred for unlimited shelf life)

The three substitute parts identified below meet the primary current and mounting requirements but vary in voltage rating coverage and package dimensions, requiring engineering evaluation based on specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

0461.500ER (Littelfuse Telelink® 461 Series)

This substitute maintains full voltage specification compatibility with the SMP 500 at 600 VAC and 80 VDC, meeting or exceeding the primary AC requirement. The 2-SMD, Square End Block package matches the original form factor with minimal dimensional variance (10.10 x 3.12 x 3.12 mm vs. 9.65 x 3.05 x 3.05 mm). Active product status ensures long-term availability. CSA and UR certifications provide regulatory coverage for telecom applications. The slow-blow response characteristic and extended operating temperature range (-55°C ~ 125°C) support demanding environments. ROHS3 compliance aligns with modern manufacturing standards.

46205000000 (Littelfuse NANO²® 462 Series)

This substitute provides reduced voltage ratings (350 V AC/DC) and employs a nonstandard SMD package configuration (10.50 x 4.50 x 4.50 mm), representing a significant dimensional increase. Selection is appropriate only for applications where voltage requirements do not exceed 350 V AC/DC. The improved DC cold resistance (0.227 Ohms) and higher breaking capacity (100A) offer performance advantages in lower-voltage circuits. Active product status and ROHS3 compliance are maintained. UL certification provides alternative regulatory pathway.

TR2/TCP500-R (Eaton TCP Series)

This substitute exhibits the lowest AC voltage rating (250 VAC) and does not specify DC voltage capability, making it unsuitable for the full 600 V AC / 125 V DC operating envelope of the SMP 500. The 2-SMD, Square End Block package is compatible, but reduced breaking capacity (50A vs. 60A AC) and lower melting I²t (1.3 vs. 2.3) indicate reduced fault tolerance. Selection is limited to applications operating below 250 VAC with no DC component. CSA and UR certifications and RoHS compliance are provided.

Frequently Asked Questions (FAQ)

Q: Can the 0461.500ER directly replace the SMP 500 in all applications?

A: The 0461.500ER maintains the critical 600 VAC specification and exceeds the 125 VDC requirement at 80 VDC, making it suitable for most applications. Minor dimensional differences (approximately 0.45 mm in length and width) require verification of PCB layout clearances. The slow-blow response characteristic should be confirmed against original circuit design intent.

Q: Why does the 46205000000 have lower voltage ratings despite being a newer product?

A: The NANO²® 462 series represents a different product line optimized for lower-voltage, higher-current-density applications. The 350 V AC/DC rating reflects design targeting for specific market segments. Selection requires confirmation that application voltage requirements do not exceed these limits.

Q: Is the TR2/TCP500-R suitable as a substitute?

A: The TR2/TCP500-R is not recommended as a primary substitute due to insufficient AC voltage rating (250 VAC vs. 600 VAC required). Use is limited to applications confirmed to operate below 250 VAC with no DC component. Breaking capacity reduction (50A vs. 60A) further restricts applicability.

Q: What are the package compatibility implications?

A: The SMP 500, 0461.500ER, and TR2/TCP500-R all use 2-SMD, Square End Block packages with minor dimensional variations within 0.5 mm. The 46205000000 employs a nonstandard SMD package approximately 1 mm larger in all dimensions, potentially requiring PCB footprint modification. Mechanical fit verification is mandatory before production implementation.

Q: Which substitute offers the best long-term availability?

A: All three substitutes carry active product status from established manufacturers (Littelfuse and Eaton). The 0461.500ER and 46205000000 are Littelfuse products with extensive telecom market presence. Procurement strategy should prioritize active-status components to ensure supply continuity beyond the obsolete SMP 500.

Q: Are there regulatory compliance differences between substitutes?

A: The SMP 500 carries CE and cURus certifications. The 0461.500ER provides CSA and UR certifications; the 46205000000 provides UL certification; the TR2/TCP500-R provides CSA and UR certifications. Application regulatory requirements determine acceptable certification pathways. All substitutes maintain REACH compliance and appropriate RoHS status.