Littelfuse 0285.500MXP Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0285.500MXP is a 500 mA, 250 V AC/DC ceramic cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in applications requiring slow-blow response characteristics. This part is Active status and widely stocked. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters that ensure direct interchangeability in holder-based fuse applications.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0285.500MXP is determined by strict equivalence across the following parameters:

Current Rating: 500 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity: 1.5 kA (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)

All identified substitute parts meet these criteria. Variations in secondary parameters such as Melting I²t, DC Cold Resistance, and approval agency certifications do not preclude substitution but are documented for engineering reference.

Parameter Comparison

Parameter	0285.500MXP	0215.500MXP	0215.500TXP	0285.500HXP	TCD-500MA
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	OptiFuse
Current Rating (Amps)	500 mA	500 mA	500 mA	500 mA	500 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA	1.5 kA	1.5 kA	1.5 kA	1.5 kA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Melting I²t	0.3	0.42	0.42	0.3	Not Specified
DC Cold Resistance (Ohms)	1.1215	1.1675	1.1675	1.1215	Not Specified
Approval Agency	-	CE, CSA, SEMKO, UL, VDE	CE, CSA, SEMKO, UL, VDE	-	cURus, IEC 60127
Inventory (Pcs)	1057	16170	1213	1027	2302

Engineering Selection Recommendations

All substitute parts listed are Active status products and ROHS3 compliant, meeting current regulatory requirements.

For applications requiring specific approval certifications, 0215.500MXP and 0215.500TXP carry CE, CSA, SEMKO, UL, and VDE approvals. The 0285.500MXP and 0285.500HXP do not list approval agencies but maintain identical electrical and mechanical specifications. TCD-500MA from OptiFuse carries cURus and IEC 60127 certifications.

Littelfuse 215 series parts (0215.500MXP, 0215.500TXP) exhibit higher Melting I²t values (0.42) and slightly elevated DC Cold Resistance (1.1675 Ohms) compared to 285 series parts (0.3 and 1.1215 Ohms respectively). These differences do not affect substitution eligibility but should be noted for thermal and resistance-sensitive applications.

Inventory availability varies: 0215.500MXP has the highest stock level at 16,170 pieces, while 0285.500HXP has the lowest at 1,027 pieces.

Frequently Asked Questions (FAQ)

Q: Can 0215.500MXP be used as a direct replacement for 0285.500MXP?

A: Yes. Both parts share identical current rating (500 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (Cartridge, Ceramic), response time (Slow Blow), breaking capacity (1.5 kA), and operating temperature range (-55°C ~ 125°C). Differences in Melting I²t and DC Cold Resistance do not prevent substitution.

Q: What is the difference between Littelfuse 215 and 285 series fuses?

A: Both series meet the same electrical and mechanical specifications for the 500 mA, 250 V rating. The 215 series carries broader approval certifications (CE, CSA, SEMKO, UL, VDE) and exhibits higher Melting I²t (0.42 vs. 0.3) and DC Cold Resistance (1.1675 vs. 1.1215 Ohms). The 285 series does not list approval agencies.

Q: Is TCD-500MA from OptiFuse compatible with Littelfuse fuse holders?

A: Yes. TCD-500MA matches all critical parameters: 500 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, Cartridge Ceramic type, Slow Blow response, 1.5 kA breaking capacity, and -55°C ~ 125°C operating temperature. It is certified to cURus and IEC 60127 standards.

Q: Which substitute part has the best availability?

A: 0215.500MXP has the highest inventory at 16,170 pieces in stock.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant.

Q: What certifications does the original 0285.500MXP carry?

A: The 0285.500MXP does not list specific approval agencies in the provided specifications.

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