5STP 315 Equivalent & Substitute Parts

Part Overview

The 5STP 315 is a 315 mA, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial through-hole package. Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts from active manufacturers is essential for design continuity, system maintenance, and procurement reliability.

Substiute Parts

5STP 315

Bel Fuse Inc.In Stock: 8435STP 315 Datasheet

Current PartRFQ

5STP 315-R

Bel Fuse Inc.In Stock: 21245STP 315-R Datasheet

DirectRFQ

0034.3112.PT

SCHURTER Inc.In Stock: 17780034.3112.PT Datasheet

DirectRFQ

0218.315MXEP

Littelfuse Inc.In Stock: 9670218.315MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5STP 315 is determined by strict equivalence across the following critical parameters:

• Current Rating: 315 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria. Substitutes are categorized as direct equivalents (identical electrical and mechanical specifications) or similar parts (meeting all critical parameters with minor dimensional or performance variations within acceptable tolerances).

Parameter Comparison

Engineering Selection Recommendations

5STP 315-R (Bel Fuse Inc.) is the primary direct equivalent. This part maintains identical electrical and mechanical specifications to the original 5STP 315, with the advantage of active product status and ROHS3 compliance. It is the recommended first choice for direct replacement in new designs and maintenance applications.

0034.3112.PT (SCHURTER Inc.) is a functionally equivalent substitute. All critical electrical parameters match the original specification. Minor dimensional variations (5.40mm diameter, 22.50mm length versus 5.50mm x 21.00mm) remain within acceptable mechanical tolerances for standard through-hole fuse holders. This part carries cURus certification and ROHS3 compliance.

0218.315MXEP (Littelfuse Inc.) is a functionally equivalent substitute. All critical electrical parameters match the original specification. Dimensional variations (5.80mm diameter, 22.50mm length) and a higher melting I²t value (1.11 versus 0.46) indicate slightly different thermal response characteristics. This part carries comprehensive certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and ROHS3 compliance. Physical fit verification in existing fuse holders is recommended prior to deployment.

All three substitute parts are active products with current manufacturing support and regulatory compliance certifications, ensuring long-term availability and supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 315-R be used as a direct replacement for the obsolete 5STP 315?

A: Yes. The 5STP 315-R is manufactured by the same supplier (Bel Fuse Inc.) and maintains identical electrical specifications (315 mA, 250 V AC/DC, slow-blow response) and mechanical package (5mm x 20mm axial through-hole). It is the recommended primary substitute.

Q: What are the key differences between the SCHURTER 0034.3112.PT and the original 5STP 315?

A: Electrical specifications are identical. Physical dimensions differ slightly: the SCHURTER part measures 5.40mm diameter x 22.50mm length compared to 5.50mm x 21.00mm for the original. These variations are within standard mechanical tolerances for through-hole fuse holders. Melting I²t is 0.544 versus 0.46 for the original.

Q: Is the Littelfuse 0218.315MXEP compatible with existing fuse holder designs?

A: The 0218.315MXEP meets all critical electrical parameters. However, its larger diameter (5.80mm) and length (22.50mm) represent the greatest dimensional deviation among substitutes. Physical fit verification in the specific fuse holder design is recommended before production deployment.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 5STP 315-R, 0034.3112.PT, and 0218.315MXEP are all ROHS3 compliant. The original 5STP 315 is RoHS non-compliant.

Q: Which substitute part has the broadest regulatory certifications?

A: The Littelfuse 0218.315MXEP carries the most comprehensive certification portfolio: CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. The Bel Fuse 5STP 315-R includes CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. The SCHURTER 0034.3112.PT carries cURus certification.

Q: What is the significance of the melting I²t parameter in fuse selection?

A: Melting I²t defines the thermal energy required to melt the fuse element. The original 5STP 315 has a melting I²t of 0.46. Substitutes with higher values (0.544 for SCHURTER, 1.11 for Littelfuse) indicate slightly slower thermal response. For applications with strict thermal response requirements, the 5STP 315-R (I²t = 0.46) maintains exact thermal characteristics.