Littelfuse 0438005.WR Surface Mount Fuse 5A 12VAC 32VDC 0603

Part Overview

The Littelfuse 0438005.WR is a 5A surface mount board fuse rated for 12VAC and 32VDC operation in a 0603 (1608 Metric) package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The fuse provides fast-blow response characteristics with CSA and UL approval certifications suitable for circuit protection applications requiring compact form factors.

Substiute Parts

0438005.WR

Littelfuse Inc.In Stock: 152450438005.WR Datasheet

Current PartRFQ

0438005.WRGT

Littelfuse Inc.In Stock: 1504790438005.WRGT Datasheet

Parametric EquivalentRFQ

CC06H5A-TR

Eaton - Electronics DivisionIn Stock: 35385CC06H5A-TR Datasheet

MFR RecommendedRFQ

SF-0603F500-2

Bourns Inc.In Stock: 50448SF-0603F500-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0438005.WR is determined by the following critical parameters:

• Current Rating: 5 A (exact match required)
• Voltage Rating - DC: 32 V (minimum requirement)
• Voltage Rating - AC: 12 V (minimum requirement for AC applications)
• Package / Case: 0603 (1608 Metric) (physical and electrical compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Response Time: Fast Blow (circuit protection characteristic)
• Breaking Capacity: 50A minimum at rated voltage

The substitute parts listed below meet all critical electrical and mechanical parameters. Variations in melting I²t, DC cold resistance, and operating temperature ranges are within acceptable engineering tolerances for this component category and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

0438005.WRGT (Littelfuse Inc.) is the primary parametric equivalent. This part maintains identical electrical specifications and operating temperature range as the main part while offering active product status and improved availability. The transition from bulk packaging to Tape & Reel format aligns with modern manufacturing processes. CSA and cURus certifications provide equivalent regulatory compliance.

CC06H5A-TR (Eaton - Electronics Division) qualifies as a functional substitute meeting all critical electrical parameters. The reduced operating temperature range (-40°C ~ 85°C versus -55°C ~ 150°C) and higher melting I²t value (2 versus 0.7398) require evaluation against specific application thermal and response time requirements. cULus certification satisfies regulatory requirements for most commercial and industrial applications.

SF-0603F500-2 (Bourns Inc.) meets all critical electrical and mechanical parameters. The melting I²t value of 0.433 is lower than the main part, indicating faster response characteristics. The operating temperature range (-20°C ~ 105°C) is narrower than the main part. UL certification is applicable for applications not requiring CSA compliance. This part is suitable for applications where the enhanced response speed is beneficial or neutral.

All substitute parts maintain ROHS3 or equivalent RoHS compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can 0438005.WRGT be used as a direct replacement for 0438005.WR?

A: Yes. The 0438005.WRGT is a parametric equivalent with identical electrical specifications, voltage ratings, current rating, and operating temperature range. The primary difference is packaging format (Tape & Reel versus bulk) and active product status. No circuit redesign is required.

Q: What is the significance of the melting I²t difference between substitute parts?

A: Melting I²t defines the thermal energy required to melt the fuse element and is directly related to response time. Lower I²t values (SF-0603F500-2 at 0.433) indicate faster response to overcurrent conditions. Higher values (CC06H5A-TR at 2) indicate slower response. Selection depends on circuit protection requirements and tolerance for transient current spikes.

Q: Are the operating temperature ranges critical for substitution?

A: Operating temperature range defines the ambient conditions under which the fuse maintains specified electrical characteristics. The main part operates from -55°C to 150°C. Substitute parts with narrower ranges (CC06H5A-TR: -40°C to 85°C; SF-0603F500-2: -20°C to 105°C) are suitable for applications operating within their specified ranges. Applications requiring the full -55°C to 150°C range should use 0438005.WRGT.

Q: Do all substitute parts have equivalent regulatory certifications?

A: Regulatory certifications differ slightly. The main part carries CSA and UL approvals. 0438005.WRGT carries CSA and cURus approvals. CC06H5A-TR carries cULus approval. SF-0603F500-2 carries UL approval. All certifications are recognized for industrial and commercial applications. Verify specific certification requirements for your application jurisdiction.

Q: Is packaging format (bulk versus Tape & Reel) a substitution consideration?

A: Packaging format affects procurement and assembly processes but not electrical performance. Tape & Reel packaging (0438005.WRGT, CC06H5A-TR, SF-0603F500-2) is standard for automated PCB assembly. Bulk packaging (0438005.WR) requires manual handling. Modern production environments typically require Tape & Reel format.

Q: Can CC06H5A-TR be used in applications requiring the full -55°C operating temperature?

A: No. CC06H5A-TR is rated only to -40°C minimum. Applications requiring operation below -40°C must use 0438005.WRGT or the main part. Verify actual application temperature requirements before substitution.