5STP 250 Equivalent & Substitute Parts

Part Overview

The 5STP 250 is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, though 1113 pieces remain in stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing system maintenance, repairs, and new designs requiring compatible fuse protection.

Substiute Parts

5STP 250

Bel Fuse Inc.In Stock: 12135STP 250 Datasheet

Current PartRFQ

5STP 250-R

Bel Fuse Inc.In Stock: 13475STP 250-R Datasheet

DirectRFQ

5TTP 250-R

Bel Fuse Inc.In Stock: 18425TTP 250-R Datasheet

Parametric EquivalentRFQ

0034.3111.PT

SCHURTER Inc.In Stock: 18610034.3111.PT Datasheet

DirectRFQ

0218.250MXEP

Littelfuse Inc.In Stock: 7790218.250MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5STP 250 is determined by strict equivalence across the following critical parameters:

• Current Rating: 250 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)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

Parts are grouped into three categories:

1. Direct Manufacturer Equivalents: Parts from Bel Fuse Inc. with identical electrical and mechanical specifications and active product status.
2. Parametric Equivalents: Parts meeting all critical electrical and mechanical parameters but with variations in secondary specifications such as breaking capacity or melting I²t.
3. Cross-Manufacturer Equivalents: Parts from alternative manufacturers meeting all critical parameters.

Parameter Comparison

Engineering Selection Recommendations

5STP 250-R (Bel Fuse Inc.): This is the primary direct equivalent. It maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The 5STP 250-R is the recommended first choice for direct replacement applications.

5TTP 250-R (Bel Fuse Inc.): This parametric equivalent meets all critical electrical and mechanical requirements. It differs in breaking capacity (100 A versus 35 A) and melting I²t (0.719 versus 0.26). This part is suitable for applications where higher breaking capacity provides additional safety margin. Active product status and ROHS3 compliance are confirmed.

0034.3111.PT (SCHURTER Inc.): This cross-manufacturer equivalent meets all critical parameters with active product status and ROHS3 compliance. Minor dimensional variations exist (5.40mm x 22.50mm versus 5.50mm x 21.00mm), and breaking capacity matches the original specification at 35 A. This part is suitable for applications where cross-manufacturer sourcing is acceptable.

0218.250MXEP (Littelfuse Inc.): This cross-manufacturer equivalent meets all critical parameters with active product status and ROHS3 compliance. Dimensional variations exist (5.80mm x 22.50mm), and breaking capacity matches at 35 A. Comprehensive approval agency certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) are provided. This part is suitable for applications requiring broad international compliance.

Frequently Asked Questions (FAQ)

Q: Can I use 5STP 250-R as a direct replacement for 5STP 250?

A: Yes. The 5STP 250-R is a direct equivalent with identical current rating (250 mA), voltage rating (250 V AC), response time (slow blow), and package dimensions (5mm x 20mm axial). The primary advantage is active product status and ROHS3 compliance compared to the obsolete, non-compliant original part.

Q: What is the difference between 5STP 250-R and 5TTP 250-R?

A: Both parts share identical current, voltage, response time, and package specifications. The 5TTP 250-R has a higher breaking capacity (100 A versus 35 A) and higher melting I²t (0.719 versus 0.26). Use 5TTP 250-R only if your application requires the enhanced breaking capacity specification.

Q: Are cross-manufacturer parts (SCHURTER, Littelfuse) fully compatible?

A: Yes, for electrical and functional purposes. Both 0034.3111.PT and 0218.250MXEP meet all critical electrical parameters and mechanical form factors. Minor dimensional variations exist but do not affect through-hole mounting compatibility. Verify approval agency certifications match your application requirements.

Q: Does the dimensional variation in 0034.3111.PT or 0218.250MXEP affect PCB mounting?

A: No. All substitute parts maintain the 5mm x 20mm axial form factor for through-hole mounting. Minor variations in overall length (21.00mm, 22.50mm) and diameter (5.40mm to 5.80mm) do not affect standard PCB hole spacing or mounting compatibility.

Q: Which substitute part has the best compliance certifications?

A: 0218.250MXEP (Littelfuse Inc.) carries the broadest approval agency certifications: CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. All substitute parts are ROHS3 compliant and REACH unaffected.