Littelfuse 021302.5MXE Equivalent & Substitute Parts

Part Overview

The Littelfuse 021302.5MXE is a 2.5 A, 250 V AC/DC glass cartridge fuse 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 circuit protection in the 2.5 ampere range at 250 volts.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (2.5 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and mounting type (through hole). All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are noted but do not disqualify substitution when the primary parameters align.

The substitute parts are grouped into two categories: Littelfuse series equivalents (021302.5MXEP, 021802.5MXEP, 021902.5MXAEP) and cross-manufacturer alternatives (Bel Fuse 5ETP 2.5-R, 5STP 2.5-R; Eaton BK/GMD-V-2.5-R, BK/S506-V-2.5-R).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
021302.5MXE	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	138	0.0305	Obsolete	RoHS Non-Compliant
021302.5MXEP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	138	0.0305	Active	ROHS3 Compliant
021802.5MXEP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021902.5MXAEP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	150	138	0.0305	Active	ROHS3 Compliant
5ETP 2.5-R	Bel Fuse Inc.	2.5	250	Slow Blow	5mm x 20mm	150	137	0.031	Active	ROHS3 Compliant
5STP 2.5-R	Bel Fuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	20	0.02	Active	ROHS3 Compliant
BK/GMD-V-2.5-R	Eaton - Electronics Division	2.5	250	Slow Blow	5mm x 20mm	100	94	0.0905	Active	ROHS3 Compliant
BK/S506-V-2.5-R	Eaton - Electronics Division	2.5	250	Slow Blow	5mm x 20mm	35	59.4	0.0255	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 021302.5MXE across the primary specification parameters. Selection should prioritize active product status and regulatory compliance.

Littelfuse 021302.5MXEP is the direct functional equivalent with identical electrical characteristics and is recommended as the primary replacement due to series continuity and active product status with ROHS3 compliance.

Littelfuse 021802.5MXEP and 021902.5MXAEP are active Littelfuse alternatives with identical current and voltage ratings. The 021902.5MXAEP offers enhanced breaking capacity (150 A versus 35 A) and is suitable for applications requiring higher fault current withstand capability.

Bel Fuse 5ETP 2.5-R and 5STP 2.5-R are cross-manufacturer alternatives with active status and full regulatory compliance. Both maintain the required electrical specifications and are suitable for direct substitution in through-hole applications.

Eaton BK/GMD-V-2.5-R and BK/S506-V-2.5-R are cross-manufacturer options with active status. The BK/S506-V-2.5-R provides the broadest approval agency coverage and is suitable for applications with stringent international certification requirements.

Frequently Asked Questions (FAQ)

Q: Can the 021302.5MXEP directly replace the obsolete 021302.5MXE?

A: Yes. The 021302.5MXEP is electrically and mechanically identical to the 021302.5MXE, with the primary difference being active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between the Littelfuse 021802.5MXEP and 021302.5MXEP?

A: Both parts share identical current, voltage, and package specifications. The 021802.5MXEP has a lower melting I²t value (23.25 versus 138) and reduced DC cold resistance (0.0219 versus 0.0305 Ohms), indicating faster response characteristics within the slow-blow category.

Q: Are Bel Fuse and Eaton fuses compatible with the original Littelfuse footprint?

A: Yes. All substitute parts maintain the 5mm x 20mm axial package form factor and through-hole mounting configuration. Physical compatibility is confirmed across all listed alternatives.

Q: Which substitute offers the highest breaking capacity?

A: The Littelfuse 021902.5MXAEP and Bel Fuse 5ETP 2.5-R both provide 150 A breaking capacity, compared to 35 A for the original part. These are suitable for applications with higher fault current requirements.

Q: What approval agencies are common across all substitutes?

A: CCC, CE, CSA, PSE, SEMKO, and VDE certifications are present across the majority of substitute parts, ensuring broad international regulatory acceptance.

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