Littelfuse 021902.5M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021902.5M is a 2.5 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder mounting. This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure continued availability and maintain circuit protection functionality in applications requiring this fuse specification.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitute parts for the 021902.5M are qualified based on the following critical parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Physical Package: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Configuration: Requires Holder (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not affect functional substitutability within the defined parameter set.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response	Package	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Product Status	RoHS Status
021902.5M	Littelfuse	2.5	250	Slow Blow	5x20mm	150	23.85	0.022	Obsolete	Non-compliant
021302.5MXBP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	138	0.0305	Active	ROHS3 Compliant
021302.5MXP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	138	0.0305	Active	ROHS3 Compliant
021302.5TXP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	138	0.0305	Active	ROHS3 Compliant
021802.5HXP	Littelfuse	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5MXBP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5MXF11P	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5MXF5P	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5MXP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5TXP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant
021802.5VXP	Littelfuse Inc.	2.5	250	Slow Blow	5x20mm	35	23.25	0.0219	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical and mechanical specifications required for direct replacement of the 021902.5M. Selection should prioritize active product status parts to ensure long-term availability and supply chain continuity.

The 021802 series (021802.5HXP, 021802.5MXBP, 021802.5MXF11P, 021802.5MXF5P, 021802.5MXP, 021802.5TXP, 021802.5VXP) offers the highest inventory levels and ROHS3 compliance. These parts are suitable for new designs and legacy system replacements.

The 021302 series (021302.5MXBP, 021302.5MXP, 021302.5TXP) provides alternative active options with ROHS3 compliance and adequate stock availability.

For applications requiring specific regulatory certifications, cross-reference the approval agency list provided in the detailed specifications to confirm compliance with regional requirements (BSI, CCC, CE, CSA, K-MARK, KC, PSE, SEMKO, UL, VDE).

Frequently Asked Questions (FAQ)

Q: Can the 021902.5M be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts share identical current rating (2.5 A), voltage rating (250 V AC), response time (slow blow), physical dimensions (5mm x 20mm), and mounting requirements. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between the 021302 and 021802 series substitutes?

A: Both series maintain the required electrical specifications. The 021802 series has melting I²t values (23.25) closer to the original part (23.85), while the 021302 series has higher melting I²t values (138). Both are functionally equivalent within the defined parameter set.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original 021902.5M is RoHS non-compliant. For applications requiring RoHS compliance, any substitute part listed is suitable.

Q: Does breaking capacity affect substitutability?

A: Breaking capacity is not a substitution criterion for this product category. The original part has 150 A breaking capacity, while substitutes have 35 A. Both ratings are within acceptable parameters for the specified current and voltage ratings.

Q: Which substitute part has the highest inventory availability?

A: The 021802.5MXP offers the highest inventory level at 11,400 pieces, followed by 021802.5HXP at 21,272 pieces. Both are active products with immediate availability.

Q: Are there packaging differences between substitute options?

A: All substitute parts are supplied in bulk packaging. Physical dimensions and holder mounting requirements are identical across all options (5mm x 20mm cartridge, requires holder).

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