5STP 4 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5STP 4 is a 4 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The 5STP 4 series provides circuit protection with a 40 A breaking capacity and is approved by multiple international standards bodies including UL, CE, CSA, VDE, and IMQ.

Substiute Parts

5STP 4

Bel Fuse Inc.In Stock: 7215STP 4 Datasheet

Current PartRFQ

5STP 4-R

Bel Fuse Inc.In Stock: 20555STP 4-R Datasheet

DirectRFQ

5ETP 4-R

Bel Fuse Inc.In Stock: 16485ETP 4-R Datasheet

Parametric EquivalentRFQ

0218004.MXEP

Littelfuse Inc.In Stock: 8230218004.MXEP Datasheet

SimilarRFQ

TSC-P-4A

OptiFuseIn Stock: 3641TSC-P-4A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5STP 4 are grouped based on electrical and mechanical compatibility. The primary substitution criteria are:

• Current Rating: 4 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm axial (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are noted but do not prevent functional substitution within the specified electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

5STP 4-R (Bel Fuse Inc.) is the direct replacement for the obsolete 5STP 4. Both parts share identical electrical and mechanical specifications with matching breaking capacity and melting I²t values. The 5STP 4-R is active in production and ROHS3 compliant, making it the preferred choice for new designs and direct substitution in existing applications. Inventory availability is 1965 units.

5ETP 4-R (Bel Fuse Inc.) is a parametric equivalent offering higher breaking capacity (150 A) and melting I²t (300) compared to the original 5STP 4. This part maintains all core electrical and mechanical parameters and is ROHS3 compliant. Selection of this part is appropriate when higher fault current protection margins are required within the same current and voltage rating envelope. Inventory availability is 1601 units.

0218004.MXEP (Littelfuse Inc.) is a similar substitute from an alternative manufacturer. It maintains all core electrical and mechanical parameters with comparable breaking capacity (40 A) and melting I²t (69.1). Physical dimensions show minor variation (0.228" diameter vs. 0.217", 0.886" length vs. 0.827"), which may require mechanical verification in space-constrained applications. This part is ROHS3 compliant and carries broader international approvals including K-MARK and PSE. Inventory availability is 755 units.

TSC-P-4A (OptiFuse) is a parametric equivalent with the highest breaking capacity (200 A) and lowest melting I²t (30.8) among the listed substitutes. This part is ROHS3 compliant and approved to UL 248 and cULus standards. The TSC-P series offers enhanced fault current handling capability. Inventory availability is 3601 units.

Frequently Asked Questions (FAQ)

Q: Can I use 5STP 4-R as a direct replacement for the obsolete 5STP 4?

A: Yes. The 5STP 4-R is the direct successor with identical electrical specifications (4 A, 250 V AC, slow-blow response) and mechanical package (5mm x 20mm axial through-hole). Both parts have matching breaking capacity (40 A) and melting I²t (56). The primary difference is product status and RoHS compliance.

Q: What is the difference between 5STP 4-R and 5ETP 4-R?

A: Both are Bel Fuse Inc. products with identical current, voltage, response time, and package specifications. The 5ETP 4-R provides higher breaking capacity (150 A vs. 40 A) and higher melting I²t (300 vs. 56). Selection depends on the fault current environment of the application.

Q: Are there physical dimension differences between these substitutes?

A: The 0218004.MXEP from Littelfuse shows minor dimensional variation: 0.228" diameter (vs. 0.217") and 0.886" length (vs. 0.827"). These differences may affect fit in space-constrained PCB layouts or fuse holders with tight mechanical tolerances. Physical verification is necessary before substitution in existing designs.

Q: Which substitute has the best availability?

A: TSC-P-4A from OptiFuse has the highest inventory at 3601 units. 5STP 4-R has 1965 units, 5ETP 4-R has 1601 units, and 0218004.MXEP has 755 units.

Q: Are all substitutes RoHS3 compliant?

A: The original 5STP 4 is RoHS non-compliant. All listed substitutes (5STP 4-R, 5ETP 4-R, 0218004.MXEP, and TSC-P-4A) are ROHS3 compliant, making them suitable for applications with RoHS compliance requirements.

Q: What approval agencies certify these parts?

A: The 5STP 4 carries UL, CE, CSA, VDE, IMQ, and SEMKO approvals. The 5STP 4-R adds CCC and cURus approvals. The 5ETP 4-R includes CCC, CE, CSA, cULus, SEMKO, and VDE. The 0218004.MXEP from Littelfuse includes CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. The TSC-P-4A is approved to cULus and UL 248 standards.