5STP 2 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5STP 2 is a 2 A, 250 V AC/DC slow blow glass cartridge fuse with a 5mm x 20mm axial package manufactured by Bel Fuse Inc. This part is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, enabling direct replacement in applications requiring this fuse rating and form factor.

Substiute Parts

5STP 2

Bel Fuse Inc.In Stock: 9525STP 2 Datasheet

Current PartRFQ

5STP 2-R

Bel Fuse Inc.In Stock: 33505STP 2-R Datasheet

DirectRFQ

5ETP 2-R

Bel Fuse Inc.In Stock: 17165ETP 2-R Datasheet

Parametric EquivalentRFQ

5TTP 2-R

Bel Fuse Inc.In Stock: 16495TTP 2-R Datasheet

Parametric EquivalentRFQ

0034.3120.PT

SCHURTER Inc.In Stock: 27830034.3120.PT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5STP 2 fuse is determined by strict equivalence across the following parameters:

• Current Rating: 2 A (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)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these core electrical and mechanical criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not preclude substitution when the primary parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

The 5STP 2-R is the direct successor to the obsolete 5STP 2, manufactured by Bel Fuse Inc. in the same 5STP series. This part maintains identical electrical and mechanical specifications with the addition of RoHS3 compliance and expanded approval agency certifications (CCC, cURus added). The 5STP 2-R is the primary recommended substitute for direct replacement applications.

The 5ETP 2-R and 5TTP 2-R are parametric equivalents from alternative Bel Fuse series (5ETP and 5TTP respectively). These parts meet all core substitution criteria but feature different breaking capacities and melting I²t values. Selection between these alternatives depends on application-specific requirements for fault current handling and thermal response characteristics.

The 0034.3120.PT from SCHURTER Inc. (FST 5x20 series) is a cross-manufacturer equivalent meeting all primary electrical and mechanical parameters. This part is suitable for applications where multi-source qualification is required. Physical dimensions show minor variation (0.213" Dia x 0.886" L versus 0.217" Dia x 0.827" L), which remains within typical through-hole PCB tolerance specifications.

All substitute parts carry RoHS3 compliance, addressing regulatory requirements not met by the obsolete 5STP 2.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 2-R be used as a direct replacement for the 5STP 2?

A: Yes. The 5STP 2-R maintains identical current rating (2 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package dimensions (5mm x 20mm axial), and mounting type (through hole). The primary difference is product status (active versus obsolete) and RoHS3 compliance.

Q: What is the difference between the 5STP 2-R, 5ETP 2-R, and 5TTP 2-R?

A: All three parts share identical electrical ratings and package specifications. The differences lie in breaking capacity and melting I²t: 5STP 2-R (35 A / 12), 5ETP 2-R (150 A / 92), and 5TTP 2-R (100 A / 29.9). Selection depends on the maximum fault current expected in the application circuit.

Q: Is the SCHURTER 0034.3120.PT mechanically compatible with the 5STP 2?

A: Yes. The 0034.3120.PT is mechanically compatible for through-hole PCB mounting. Physical dimensions show minor variation (5.40mm x 22.50mm versus 5.50mm x 21.00mm), which remains within standard PCB tolerance specifications for 5mm x 20mm fuse holders.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 5STP 2-R, 5ETP 2-R, 5TTP 2-R, and 0034.3120.PT are all RoHS3 compliant. The original 5STP 2 is RoHS non-compliant.

Q: Which substitute part should I select for a new design?

A: For new designs, the 5STP 2-R is the recommended choice as the direct active successor in the same series. For applications requiring higher breaking capacity, the 5ETP 2-R or 5TTP 2-R may be selected based on fault current requirements.