5TTP 1-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5TTP 1-R is a 1 A, 250 V AC/DC slow blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm through-hole package. This component is active in production and widely used in electronic equipment requiring overcurrent protection. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and performance characteristics to ensure functional interchangeability in circuit protection applications.

Substiute Parts

5TTP 1-R

Bel Fuse Inc.In Stock: 18735TTP 1-R Datasheet

Current PartRFQ

5ETP 1-R

Bel Fuse Inc.In Stock: 18935ETP 1-R Datasheet

Parametric EquivalentRFQ

5STP 1-R

Bel Fuse Inc.In Stock: 18065STP 1-R Datasheet

Parametric EquivalentRFQ

0239001.MXEP

Littelfuse Inc.In Stock: 20480239001.MXEP Datasheet

DirectRFQ

TSC-P-1A

OptiFuseIn Stock: 2688TSC-P-1A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5TTP 1-R is determined by the following critical parameters:

• Current Rating: All substitutes must be rated at 1 A
• Voltage Rating: All substitutes must be rated at 250 V AC
• Fuse Type: All substitutes must be glass cartridge fuses
• Response Time: All substitutes must be slow blow
• Package Dimensions: All substitutes must fit 5mm x 20mm through-hole footprints
• Mounting Type: All substitutes must support through-hole mounting

The substitute parts listed below meet these core requirements. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are secondary parameters that may influence selection based on specific application requirements but do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and meet the core electrical and mechanical requirements of the 5TTP 1-R. Selection among substitutes should be based on:

• Regulatory Compliance: Verify that the substitute part's approval agencies (CE, CSA, cULus, UL, etc.) align with the target application's regional requirements
• Breaking Capacity: The 5ETP 1-R offers the highest breaking capacity (150 A), while 5STP 1-R and 0239001.MXEP provide lower breaking capacity (35 A). Select based on circuit fault current levels
• Melting I²t Characteristics: Variations in melting I²t affect thermal response. The 5STP 1-R (2.4) and TSC-P-1A (2.242) provide faster thermal response, while 5ETP 1-R (28) provides slower response
• DC Cold Resistance: The 5STP 1-R offers the lowest resistance (0.095 Ohms), which may be advantageous in low-voltage applications
• Manufacturer Availability: All parts are in stock. Littelfuse (0239001.MXEP) and OptiFuse (TSC-P-1A) provide cross-manufacturer alternatives to Bel Fuse Inc. products

Frequently Asked Questions (FAQ)

Q: Can the 5ETP 1-R replace the 5TTP 1-R in all applications?

A: The 5ETP 1-R is electrically and mechanically compatible with the 5TTP 1-R. Both are 1 A, 250 V slow blow glass cartridge fuses in 5mm x 20mm packages. The 5ETP 1-R has a higher breaking capacity (150 A vs. 100 A) and higher melting I²t (28 vs. 8.63), which may affect thermal response characteristics. Verify that these differences are acceptable for your specific circuit design.

Q: What is the difference between the Bel Fuse Inc. and Littelfuse 0239001.MXEP options?

A: Both are 1 A, 250 V slow blow glass cartridge fuses with identical electrical ratings and 5mm x 20mm packages. The 0239001.MXEP has a slightly larger physical length (21.50mm vs. 21.00mm) and different approval agencies (CE, CSA, KC, PSE, UL vs. CE, CSA, cULus, PSE). Confirm that the dimensional difference and regulatory certifications are compatible with your application.

Q: Why does the TSC-P-1A have a lower melting I²t than other options?

A: The TSC-P-1A (2.242) has a lower melting I²t compared to the 5TTP 1-R (8.63) and 5ETP 1-R (28). This indicates faster thermal response to overcurrent conditions. Select the TSC-P-1A if your circuit requires more sensitive protection; select alternatives if slower thermal response is required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements for electronic components.

Q: Can I use the 5STP 1-R as a direct replacement for the 5TTP 1-R?

A: The 5STP 1-R is electrically and mechanically compatible with the 5TTP 1-R. Both are 1 A, 250 V slow blow glass cartridge fuses in 5mm x 20mm packages. The 5STP 1-R has a lower breaking capacity (35 A vs. 100 A) and lower melting I²t (2.4 vs. 8.63), indicating faster thermal response. Verify that these characteristics are suitable for your circuit protection requirements.