Littelfuse 042902.5WRM Equivalent & Substitute Parts

Part Overview

The Littelfuse 042902.5WRM is a 2.5 A surface mount fuse rated for 32 V AC/DC operation in a 1206 (3216 Metric) package configuration. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 90°C with fast-blow response characteristics suitable for board-level protection applications.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Current Rating	2.5 A
Voltage Rating (AC)	32 V
Voltage Rating (DC)	32 V
Fuse Type	Board Mount (Cartridge Style Excluded)
Mounting Type	Surface Mount
Package / Case	1206 (3216 Metric)
Response Time	Fast Blow
Operating Temperature Range	-55°C to 90°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 042902.5WRM is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating: 32 V AC and 32 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 1206 (3216 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

The substitute part 046602.5NR meets all these criteria and is manufactured by the same supplier, Littelfuse Inc., ensuring design compatibility and functional equivalence.

Parameter Comparison

Parameter	042902.5WRM (Main Part)	046602.5NR (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	2.5 A	2.5 A
Voltage Rating - AC	32 V	32 V
Voltage Rating - DC	32 V	32 V
Response Time	Fast Blow	Fast Blow
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)
Mounting Type	Surface Mount	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Operating Temperature Range	-55°C to 90°C	-55°C to 90°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 046602.5NR is the direct substitute for the obsolete 042902.5WRM. Both parts share identical electrical ratings and mechanical specifications. The 046602.5NR offers the advantage of active product status, ensuring long-term availability and supply chain continuity. Additionally, the 046602.5NR carries ROHS3 compliance and CSA/UL approvals, providing enhanced regulatory alignment for new designs and production environments requiring modern compliance standards.

Frequently Asked Questions (FAQ)

Q: Can the 046602.5NR be used as a direct replacement for the 042902.5WRM?

A: Yes. Both parts are identical in current rating (2.5 A), voltage rating (32 V AC/DC), response time (Fast Blow), package (1206), and mounting type (Surface Mount). Electrical and mechanical compatibility is confirmed.

Q: What is the primary difference between these two parts?

A: The 042902.5WRM is obsolete, while the 046602.5NR is active. The 046602.5NR also includes ROHS3 compliance and CSA/UL certifications, whereas the 042902.5WRM is RoHS non-compliant.

Q: Are there any physical dimension differences?

A: The height dimension differs slightly. The 042902.5WRM measures 0.045" H (1.14 mm), while the 046602.5NR measures 0.023" H (0.58 mm). Both maintain the same 1206 package footprint and are compatible with standard surface mount assembly processes.

Q: What certifications does the substitute part carry?

A: The 046602.5NR is certified by CSA and UL, with ROHS3 compliance and REACH Unaffected status.

Q: Is the 046602.5NR available in different packaging options?

A: Yes. The 046602.5NR is supplied in Tape & Reel (TR) packaging, with 35,250 pieces available in stock.

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