Equivalent & Substitute Parts for 066401.6ZRLL

Part Overview

The Littelfuse 066401.6ZRLL is a 1.6 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical ratings, mechanical compatibility, and approval certifications to ensure functional equivalence in circuit protection applications.

Substiute Parts

066401.6ZRLL

Littelfuse Inc.In Stock: 956066401.6ZRLL Datasheet

Current PartRFQ

38211600000

Littelfuse Inc.In Stock: 427738211600000 Datasheet

DirectRFQ

0034.6917

SCHURTER Inc.In Stock: 11190034.6917 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 066401.6ZRLL is determined by strict equivalence across the following parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity @ Rated Voltage: 100 A (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

Two active substitute parts meet these criteria: Littelfuse 38211600000 (TR5® 382 series) and SCHURTER 0034.6917 (MXT 250 series). Both maintain full electrical and mechanical compatibility with the obsolete 066401.6ZRLL.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing status, providing long-term availability compared to the obsolete 066401.6ZRLL.

Littelfuse 38211600000 (TR5® 382 series): This part maintains Littelfuse manufacturer continuity and carries overlapping approval certifications (CCC, SEMKO, VDE). It is supplied in Cut Tape packaging and demonstrates lower DC cold resistance (0.0377 Ohms versus 0.06 Ohms), which may reduce resistive heating in low-impedance circuits. Height dimension is 8.00 mm versus the original 8.45 mm, representing a minor reduction that should be evaluated for PCB layout clearance.

SCHURTER 0034.6917 (MXT 250 series): This part provides cross-manufacturer substitution with equivalent electrical performance and matching approval certifications (CCC, VDE). It is supplied in bulk packaging and maintains the original melting I²t value of 10, matching the thermal response profile of the 066401.6ZRLL. Height dimension is 8.50 mm, providing the closest mechanical match to the original part.

Selection between these substitutes should be based on procurement requirements, packaging preferences, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can 38211600000 and 0034.6917 be used interchangeably with 066401.6ZRLL?

A: Both parts meet the mandatory substitution criteria: identical current rating (1.6 A), voltage rating (250 V AC), response time (slow blow), mounting type (through hole), package style (radial, can, vertical), breaking capacity (100 A), operating temperature range (-40°C ~ 85°C), and RoHS compliance. They are functionally equivalent for circuit protection applications.

Q: What are the dimensional differences between the substitutes?

A: The main part measures 0.335" Dia x 0.333" H (8.50mm x 8.45mm). The Littelfuse 38211600000 is 0.335" Dia x 0.315" H (8.50mm x 8.00mm), approximately 0.45 mm shorter. The SCHURTER 0034.6917 is 0.335" Dia x 0.335" H (8.50mm x 8.50mm), approximately 0.05 mm taller. All three maintain identical diameter specifications.

Q: How do the DC cold resistance values differ?

A: The original 066401.6ZRLL has 0.06 Ohms DC cold resistance. The Littelfuse 38211600000 has 0.0377 Ohms, representing lower resistive heating. The SCHURTER 0034.6917 does not specify this parameter in available documentation.

Q: What approval certifications do the substitutes carry?

A: The Littelfuse 38211600000 carries CCC, cURus, KC, PSE/JET, SEMKO, and VDE approvals. The SCHURTER 0034.6917 carries CCC, cURus, KC, PSE/JET, and VDE approvals. Both maintain VDE and CCC certifications present in the original part.

Q: What packaging formats are available for these substitutes?

A: The Littelfuse 38211600000 is supplied in Cut Tape (CT) packaging. The SCHURTER 0034.6917 is supplied in bulk packaging. Packaging selection should align with assembly process requirements and inventory management practices.

Q: Are there differences in melting I²t values?

A: The original 066401.6ZRLL and SCHURTER 0034.6917 both have melting I²t of 10. The Littelfuse 38211600000 has melting I²t of 12.67, indicating slightly slower thermal response. This difference should be evaluated against specific circuit protection requirements.