Equivalent & Substitute Parts for 5HTP 1 Ceramic Fuse

Part Overview

The 5HTP 1 is a 1 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. with a 5mm x 20mm axial form factor and slow-blow response characteristics. This part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement. The fuse is designed for through-hole mounting applications requiring ceramic construction and slow-blow protection in AC/DC circuits.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	5mm x 20mm (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: current rating (1 A), AC voltage rating (250 V minimum), fuse type (ceramic cartridge), package dimensions (5mm x 20mm axial), response time (slow blow), and mounting configuration (through hole). All identified substitutes meet these core electrical and mechanical requirements. Variations in melting I²t values, DC voltage ratings, physical dimensions within tolerance, and DC cold resistance do not preclude substitution when AC ratings and current handling are equivalent.

Parameter Comparison

Parameter	5HTP 1	5HTP 1-R	0001.2504.PT	0215001.MXESPP
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	SCHURTER Inc.	Littelfuse Inc.
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	Not specified	300 V	Not specified
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Breaking Capacity @ Rated Voltage	1.5 kA	1.5 kA	1.5 kA	1.5 kA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Melting I²t	1.7	1.7	1.1	1.52
DC Cold Resistance	0.2 Ohms	0.2 Ohms	Not specified	0.1515 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CCC, CE, CSA, cULus, IMQ, PSE, SEMKO, VDE	CCC, CE, CSA, cULus, IMQ, PSE, SEMKO, VDE	cURus	CE, CQC, CSA, KC, PSE, UR, VDE

Engineering Selection Recommendations

5HTP 1-R is the primary direct substitute, manufactured by the same supplier (Bel Fuse Inc.) with identical electrical specifications and active product status. This part provides ROHS3 compliance and maintains all original certifications.

0215001.MXESPP (Littelfuse Inc.) is a functional equivalent with active status and ROHS3 compliance. It meets all core electrical requirements and carries comprehensive international certifications. Melting I²t of 1.52 and DC cold resistance of 0.1515 Ohms are within acceptable tolerance for AC-rated applications.

0001.2504.PT (SCHURTER Inc.) is a functional equivalent with extended DC voltage rating (300 V) and active product status. ROHS3 compliance is confirmed. The lower melting I²t value (1.1) and different physical dimensions (5.40mm x 22.50mm) require verification for mechanical fit in existing PCB layouts, though electrical performance remains equivalent for the specified 1 A, 250 V AC application.

Frequently Asked Questions (FAQ)

Q: Can 5HTP 1-R directly replace the obsolete 5HTP 1?

A: Yes. Both parts are manufactured by Bel Fuse Inc. and share identical electrical specifications: 1 A current rating, 250 V AC voltage rating, ceramic cartridge construction, 5mm x 20mm package, slow-blow response, and 1.5 kA breaking capacity. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What are the key differences between the Littelfuse and SCHURTER substitutes?

A: 0215001.MXESPP (Littelfuse) maintains melting I²t of 1.52, closely matching the original 1.7 value. 0001.2504.PT (SCHURTER) has a lower melting I²t of 1.1 and includes a 300 V DC rating. Both meet the 1 A, 250 V AC core requirement. Physical dimensions vary slightly: Littelfuse is 5.20mm x 20.00mm, SCHURTER is 5.40mm x 22.50mm.

Q: Are all substitutes RoHS compliant?

A: The original 5HTP 1 is RoHS non-compliant. All three substitutes (5HTP 1-R, 0001.2504.PT, and 0215001.MXESPP) are ROHS3 compliant.

Q: Which substitute has the broadest certification coverage?

A: 5HTP 1-R maintains the original certification set (CCC, CE, CSA, cULus, IMQ, PSE, SEMKO, VDE). 0215001.MXESPP carries CE, CQC, CSA, KC, PSE, UR, VDE. 0001.2504.PT carries cURus certification.

Q: Does the variation in melting I²t affect substitution suitability?

A: All three substitutes meet the 1 A, 250 V AC electrical specification. Melting I²t variations (1.7 original, 1.52 Littelfuse, 1.1 SCHURTER) reflect different thermal response characteristics but do not preclude substitution when current and voltage ratings are matched.

Q: Are there mechanical fit considerations for PCB mounting?

A: 5HTP 1-R and 0215001.MXESPP have dimensions within 0.217" to 0.205" diameter and 0.827" to 0.787" length, suitable for standard 5mm x 20mm through-hole footprints. 0001.2504.PT dimensions (5.40mm x 22.50mm) are slightly larger and require verification against existing PCB hole spacing and clearance.

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