Littelfuse 046002.5ER Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 046002.5ER is a 2.5 A, 125 V AC/DC surface mount board mount fuse in the PICO® 460 series. This slow blow fuse is designed for circuit protection in applications requiring reliable overcurrent protection with a 50 A breaking capacity at rated voltage. The part is actively manufactured and widely stocked, with full compliance to CSA, PSE, and UL approval agencies. Substitute parts are identified when inventory constraints, lead time requirements, or supply chain considerations necessitate alternative sourcing while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Current Rating	2.5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Surface Mount
Package / Case	2-SMD, J-Lead
Breaking Capacity @ Rated Voltage	50 A
Melting I²t	13
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.052 Ohms
Size / Dimension	0.285" L x 0.170" W x 0.120" H (7.24mm x 4.32mm x 3.05mm)
Approval Agencies	CSA, PSE, UL
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

The Littelfuse 046002.5UR is identified as a parametric equivalent to the 046002.5ER based on strict alignment of all critical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

Current Rating: 2.5 A (identical)
Voltage Rating: 125 V AC / 125 V DC (identical)
Response Time: Slow Blow (identical)
Mounting Type: Surface Mount (identical)
Package / Case: 2-SMD, J-Lead (identical)
Breaking Capacity: 50 A @ rated voltage (identical)
Melting I²t: 13 (identical)
Operating Temperature Range: -55°C to 125°C (identical)
DC Cold Resistance: 0.052 Ohms (identical)
Physical Dimensions: 0.285" L x 0.170" W x 0.120" H (identical)
Approval Agencies: CSA, PSE, UL (identical)
RoHS Compliance: ROHS3 Compliant (identical)

Both parts belong to the PICO® 460 series and maintain active product status with full manufacturing support.

Parameter Comparison

Parameter	046002.5ER	046002.5UR	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Yes
Series	PICO® 460	PICO® 460	Yes
Current Rating (Amps)	2.5 A	2.5 A	Yes
Voltage Rating - AC	125 V	125 V	Yes
Voltage Rating - DC	125 V	125 V	Yes
Response Time	Slow Blow	Slow Blow	Yes
Package / Case	2-SMD, J-Lead	2-SMD, J-Lead	Yes
Breaking Capacity @ Rated Voltage	50 A	50 A	Yes
Melting I²t	13	13	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Yes
DC Cold Resistance	0.052 Ohms	0.052 Ohms	Yes
Size / Dimension	0.285" L x 0.170" W x 0.120" H (7.24mm x 4.32mm x 3.05mm)	0.285" L x 0.170" W x 0.120" H (7.24mm x 4.32mm x 3.05mm)	Yes
Approval Agency	CSA, PSE, UL	CSA, PSE, UL	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes
Product Status	Active	Active	Yes

Engineering Selection Recommendations

Both the 046002.5ER and 046002.5UR are active products manufactured by Littelfuse Inc. with identical electrical specifications, mechanical dimensions, and regulatory certifications. Selection between these parts should be based on availability and packaging requirements. Both parts are supplied in Tape & Reel (TR) packaging and carry full compliance with CSA, PSE, and UL approval agencies. The 046002.5UR currently maintains higher inventory levels (2200 pcs vs. 1085 pcs), which may influence procurement decisions for high-volume applications. Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity classification, indicating no special storage or handling requirements beyond standard component practices.

Frequently Asked Questions (FAQ)

Q: Can the 046002.5UR be used as a direct replacement for the 046002.5ER in existing designs?

A: Yes. Both parts are identical in all electrical parameters (2.5 A, 125 V AC/DC, slow blow response), mechanical dimensions (0.285" L x 0.170" W x 0.120" H), and package configuration (2-SMD, J-Lead surface mount). No circuit redesign or PCB layout modification is required.

Q: Are there any differences in approval certifications between these parts?

A: No. Both parts carry identical approval from CSA, PSE, and UL agencies. Regulatory compliance is maintained across both part numbers.

Q: What is the significance of the different part number suffixes (ER vs. UR)?

A: The suffix designates internal Littelfuse manufacturing or packaging variants. Both parts belong to the PICO® 460 series and maintain identical functional and electrical specifications.

Q: Are both parts available in the same packaging format?

A: Yes. Both the 046002.5ER and 046002.5UR are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: Do these parts require special handling or storage conditions?

A: No. Both parts carry MSL Level 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. Standard component storage practices apply.

Q: What is the breaking capacity of these fuses?

A: Both parts have a breaking capacity of 50 A at the rated voltage of 125 V AC/DC.

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