5STP 63-R Equivalent & Substitute Parts

Part Overview

The 5STP 63-R is a 63 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm axial through-hole package, manufactured by Bel Fuse Inc. This component is active in production and widely used in electronic equipment requiring overcurrent protection. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in circuit designs.

Substiute Parts

5STP 63-R

Bel Fuse Inc.In Stock: 17635STP 63-R Datasheet

Current PartRFQ

0034.3105.PT

SCHURTER Inc.In Stock: 13850034.3105.PT Datasheet

DirectRFQ

BK/S506-V-63-R

Eaton - Electronics DivisionIn Stock: 823BK/S506-V-63-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5STP 63-R are qualified based on the following criteria:

• Current Rating: 63 mA (exact match required)
• Voltage Rating: 250 V AC (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: 35 A (exact match required)
• RoHS Compliance: ROHS3 Compliant (required)

All substitute parts listed meet these electrical and mechanical parameters, confirming direct interchangeability in the 5STP 63-R application.

Parameter Comparison

Engineering Selection Recommendations

All three parts—5STP 63-R, 0034.3105.PT, and BK/S506-V-63-R—are active products with ROHS3 compliance and meet the core electrical and mechanical specifications for direct substitution. Selection among these parts should be based on:

• Approval Agency requirements: The 5STP 63-R carries CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE certifications. The 0034.3105.PT carries cURus certification. The BK/S506-V-63-R carries BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE certifications.
• Inventory availability and lead time considerations
• DC cold resistance characteristics, which vary among manufacturers (5STP 63-R: 23.9 Ohms; BK/S506-V-63-R: 6.96 Ohms)
• Melting I²t values, which differ slightly across manufacturers

Frequently Asked Questions (FAQ)

Q: Can the 0034.3105.PT replace the 5STP 63-R directly?

A: Yes. Both parts share identical current rating (63 mA), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package dimensions (5mm x 20mm axial), and breaking capacity (35 A). Physical dimensions are within acceptable tolerance for through-hole mounting.

Q: What is the difference in melting I²t between these parts?

A: Melting I²t values differ: 5STP 63-R (0.008), 0034.3105.PT (0.0401), and BK/S506-V-63-R (0.021). These variations reflect manufacturer-specific thermal characteristics but do not affect substitutability at the specified 63 mA rating.

Q: Are there approval agency differences I should consider?

A: Yes. The 5STP 63-R and BK/S506-V-63-R carry broader certification portfolios (including CCC, CE, CSA, VDE). The 0034.3105.PT carries cURus certification. Verify that the substitute part's certifications meet your application's regulatory requirements.

Q: Do physical dimension variations affect mounting?

A: All three parts are specified for 5mm x 20mm axial through-hole mounting. Minor dimensional variations (5.40mm to 5.54mm diameter; 21.00mm to 22.50mm length) are within standard PCB footprint tolerances and do not prevent direct substitution.

Q: What is the significance of DC cold resistance differences?

A: DC cold resistance varies: 5STP 63-R (23.9 Ohms) and BK/S506-V-63-R (6.96 Ohms). This parameter reflects internal resistance characteristics but does not affect fuse operation at the rated 63 mA current or 250 V voltage specification.