Littelfuse 067201.6DRT4 Equivalent & Substitute Parts

Part Overview

The Littelfuse 067201.6DRT4 is a 1.6 A, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in axial configuration. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The glass cartridge construction provides visual indication of fuse status while maintaining fast-response protection for sensitive circuits.

Substiute Parts

067201.6DRT4

Littelfuse Inc.In Stock: 1095067201.6DRT4 Datasheet

Current PartRFQ

087401.6MRET1P

Littelfuse Inc.In Stock: 970087401.6MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 067201.6DRT4 is determined by strict equivalence across the following critical parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Cartridge, Non-Standard (Axial) (exact match required)

The Littelfuse 087401.6MRET1P qualifies as a direct substitute based on these parameters. While the fuse cartridge material differs (ceramic versus glass), both constructions maintain identical electrical performance characteristics, current ratings, voltage ratings, response times, and breaking capacity. The dimensional variation (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L) remains within acceptable mechanical tolerances for standard through-hole axial mounting applications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 087401.6MRET1P is the designated manufacturer-recommended substitute for the obsolete 067201.6DRT4. Selection of this substitute is supported by the following engineering factors:

Product Status: The 067201.6DRT4 is obsolete, while the 087401.6MRET1P maintains active product status with current manufacturing support and availability.

Regulatory Compliance: The 087401.6MRET1P achieves ROHS3 compliance and REACH unaffected status, providing improved environmental and regulatory alignment compared to the non-compliant original part. Both parts maintain equivalent UL/CSA certifications (cULus for the substitute).

Electrical Equivalence: All critical electrical parameters—current rating, voltage rating, response time, breaking capacity, and melting I²t—are equivalent between the two parts, ensuring identical circuit protection performance.

Mechanical Compatibility: The ceramic cartridge construction of the 087401.6MRET1P accommodates standard through-hole axial mounting with dimensions that remain compatible with existing mechanical mounting provisions. The slightly reduced diameter and length do not compromise mounting integrity in standard fuse holder applications.

Operational Range: The 087401.6MRET1P specifies an operating temperature range of -55°C to 125°C, providing defined thermal performance boundaries for system design.

Frequently Asked Questions (FAQ)

Q: Can the 087401.6MRET1P be used as a direct replacement for the 067201.6DRT4 in existing designs?

A: Yes. The 087401.6MRET1P meets all critical electrical and mechanical substitution criteria. Both parts share identical current ratings (1.6 A), voltage ratings (250 V AC), response times (fast blow), and breaking capacity (50 A). Through-hole axial mounting compatibility is maintained.

Q: What is the difference between glass and ceramic cartridge fuses?

A: Glass and ceramic cartridges both provide equivalent electrical protection performance at the specified ratings. Glass cartridges offer visual status indication through transparency, while ceramic cartridges provide enhanced mechanical robustness. For the 1.6 A, 250 V fast-blow application, both constructions deliver identical circuit protection characteristics.

Q: Are there dimensional concerns when substituting the 087401.6MRET1P for the 067201.6DRT4?

A: The 087401.6MRET1P is slightly smaller (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L). This dimensional reduction remains compatible with standard through-hole axial fuse holders and does not compromise mechanical mounting or electrical performance.

Q: What compliance improvements does the 087401.6MRET1P provide?

A: The 087401.6MRET1P achieves ROHS3 compliance and REACH unaffected status, compared to the RoHS non-compliant status of the original 067201.6DRT4. Both parts maintain equivalent UL/CSA certifications.

Q: Is the 087401.6MRET1P available in the same packaging as the original part?

A: The 087401.6MRET1P is supplied in Tape & Reel (TR) packaging, which is standard for active production components. The original 067201.6DRT4 packaging specification is not provided in the technical data.

Q: What is the operating temperature range for the substitute part?

A: The 087401.6MRET1P operates across -55°C to 125°C. The original 067201.6DRT4 does not specify an operating temperature range in the available technical documentation.