Littelfuse 0447003.YP Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0447003.YP is a 3 A, 350 V AC / 125 V DC board mount fuse with fast blow response characteristics. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing procurement and design continuity. The part features through-hole radial mounting in a box package configuration, suitable for circuit protection applications requiring fast-acting response.

Substiute Parts

0447003.YP

Littelfuse Inc.In Stock: 8500447003.YP Datasheet

Current PartRFQ

0447003.YXP

Littelfuse Inc.In Stock: 7610447003.YXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0447003.YP is based on electrical and mechanical parameter equivalence within the Littelfuse 447 series. The substitute part 0447003.YXP maintains identical electrical specifications across all critical parameters: current rating (3 A), AC voltage rating (350 V), DC voltage rating (125 V), response time (fast blow), breaking capacity (100 A AC / 50 A DC), melting I²t (9.4), and thermal operating range (-40°C ~ 125°C). Physical dimensions, mounting configuration (through-hole radial), and package type (box) are identical. The primary distinction is packaging format and product status: the substitute transitions from box packaging to bulk packaging and from obsolete to active product status. All regulatory certifications (CSA, METI, UL) and compliance standards (ROHS3) remain consistent.

Parameter Comparison

Engineering Selection Recommendations

The 0447003.YXP is the direct equivalent substitute for the obsolete 0447003.YP. Both parts are manufactured by Littelfuse Inc. within the 447 series and share identical electrical and mechanical specifications. The substitute part carries active product status, ensuring continued availability and supply chain reliability. All regulatory certifications (CSA, METI, UL) and environmental compliance standards (ROHS3) are maintained. The transition from box to bulk packaging does not affect functional performance or circuit protection characteristics. Selection of the 0447003.YXP eliminates obsolescence risk while preserving complete electrical and mechanical compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Are the 0447003.YP and 0447003.YXP electrically identical?

A: Yes. Both parts have identical current ratings (3 A), voltage ratings (350 V AC / 125 V DC), response time (fast blow), breaking capacity (100 A AC / 50 A DC), melting I²t (9.4), and operating temperature range (-40°C ~ 125°C).

Q: What is the difference between these two parts?

A: The primary differences are product status and packaging format. The 0447003.YP is obsolete and supplied in box packaging. The 0447003.YXP is active and supplied in bulk packaging. All electrical and mechanical specifications are identical.

Q: Can the 0447003.YXP be used as a direct replacement in existing designs?

A: Yes. The substitute part maintains identical dimensions (0.430" L x 0.150" W x 0.404" H), mounting configuration (through-hole radial), and package type (radial, box). No design modifications are required.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both parts carry identical certifications from CSA, METI, and UL, and both are ROHS3 compliant.

Q: Does the bulk packaging of the substitute part affect performance?

A: No. Packaging format does not affect electrical performance, protection characteristics, or reliability. The bulk packaging is a supply and logistics consideration only.