Littelfuse 0218.125MXEP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.125MXEP is a 125 mA, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor. This component is designed for circuit protection in electronic equipment requiring reliable overcurrent interruption. The part maintains active product status with 1060 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in applications where component availability or supply chain requirements necessitate alternative sourcing.

Substiute Parts

0218.125MXEP

Littelfuse Inc.In Stock: 11590218.125MXEP Datasheet

Current PartRFQ

0034.3108.PT

SCHURTER Inc.In Stock: 13140034.3108.PT Datasheet

DirectRFQ

5STP 125-R

Bel Fuse Inc.In Stock: 17935STP 125-R Datasheet

DirectRFQ

BK/S506-V-125-R

Eaton - Electronics DivisionIn Stock: 1020BK/S506-V-125-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following parameters:

• Current Rating: 125 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)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

All four substitute parts meet these criteria and are therefore direct equivalents for the Littelfuse 0218.125MXEP.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are active products with ROHS3 compliance and meet the core electrical and mechanical specifications of the Littelfuse 0218.125MXEP. Selection among these equivalents should be based on:

• Approval agency certifications required for the target application
• Physical dimension tolerances within the specified 5mm x 20mm form factor
• Inventory availability and supply chain lead times
• DC cold resistance characteristics if relevant to circuit design parameters

The Littelfuse 0218.125MXEP carries the broadest approval agency coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), making it suitable for applications with stringent international compliance requirements. The Bel Fuse 5STP 125-R offers the highest current inventory (1715 units) and includes cULus certification. The SCHURTER 0034.3108.PT and Eaton BK/S506-V-125-R provide alternative sourcing options with comparable certifications and availability.

Frequently Asked Questions (FAQ)

Q: Can these substitute parts be used interchangeably with the Littelfuse 0218.125MXEP?

A: Yes. All four substitute parts meet identical electrical ratings (125 mA, 250 V AC/DC), fuse type (cartridge, glass), response time (slow blow), and mechanical form factor (5mm x 20mm axial, through hole). They are direct equivalents for circuit protection applications.

Q: What are the physical dimension differences among these parts?

A: While all parts conform to the 5mm x 20mm nominal specification, minor dimensional variations exist. The Littelfuse part measures 5.80mm diameter x 22.50mm length, while substitutes range from 5.40mm to 5.54mm diameter and 21.00mm to 22.50mm length. These variations remain within acceptable mechanical tolerances for standard through-hole fuse holders.

Q: Do all substitute parts have the same approval certifications?

A: No. The Littelfuse 0218.125MXEP includes K-MARK and UL certifications not present in all substitutes. The Bel Fuse 5STP 125-R includes cULus and IMQ certifications. The Eaton BK/S506-V-125-R includes BSI and UR certifications. Application requirements should determine which certification profile is necessary.

Q: What is the significance of the Melting I²t values shown in the comparison?

A: Melting I²t represents the thermal energy required to melt the fuse element. The Littelfuse part (0.1465) has a higher value than the substitutes (0.05 to 0.064), indicating slightly different thermal response characteristics. For applications sensitive to thermal response timing, this parameter should be evaluated against circuit protection requirements.

Q: Are there any RoHS or environmental compliance differences?

A: All parts are ROHS3 compliant and REACH unaffected. No environmental compliance differences exist among the options presented.