Equivalent & Substitute Parts for 066201.6ZRLL

Part Overview

The Littelfuse 066201.6ZRLL is a 1.6 A 250 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in a can-style vertical package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical ratings, mechanical compatibility, and approval certifications to ensure direct interchangeability in existing circuit designs.

Substiute Parts

066201.6ZRLL

Littelfuse Inc.In Stock: 1010066201.6ZRLL Datasheet

Current PartRFQ

37011600000

Littelfuse Inc.In Stock: 527837011600000 Datasheet

DirectRFQ

0034.6016

SCHURTER Inc.In Stock: 13170034.6016 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 066201.6ZRLL is determined by strict equivalence across the following parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Board Mount, Through Hole mounting
• Package / Case: Radial, Can, Vertical configuration
• Breaking Capacity: 35 A @ rated voltage
• Response Time: Fast Blow
• RoHS Compliance: ROHS3 Compliant

Two substitute parts meet these criteria and are qualified for direct replacement:

1. 37011600000 (Littelfuse Inc., TR5® 370 series) – Active product status with expanded operating temperature range
2. 0034.6016 (SCHURTER Inc., MSF 250 series) – Active product status with equivalent electrical and mechanical specifications

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with full RoHS3 compliance and international safety certifications. Selection between them depends on specific application requirements:

37011600000 (Littelfuse TR5® 370) is recommended when operating temperature range expansion is beneficial, as it supports -40°C to 85°C operation. This part carries broader regulatory approvals including CCC and PSE certifications. The lower melting I²t value (0.53 versus 0.94) indicates faster thermal response, suitable for applications requiring enhanced overcurrent sensitivity.

0034.6016 (SCHURTER MSF 250) is recommended when thermal characteristics matching the original design are prioritized. The melting I²t value of 0.94 matches the main part exactly, ensuring identical thermal trip curves. Physical dimensions are also equivalent to the original specification.

Both parts maintain the required 35 A breaking capacity and fast-blow response time. Dimensional variations are within acceptable mechanical tolerances for standard through-hole PCB mounting.

Frequently Asked Questions (FAQ)

Q: Can 37011600000 and 0034.6016 be used interchangeably with 066201.6ZRLL?

A: Yes. Both parts meet all electrical and mechanical substitution criteria: identical current rating (1.6 A), voltage rating (250 V AC), fuse type, mounting configuration, and breaking capacity (35 A). All three parts are RoHS3 compliant and carry appropriate safety certifications.

Q: What is the significance of the melting I²t difference between 37011600000 (0.53) and the main part (0.94)?

A: Melting I²t defines the thermal energy required to melt the fuse element. The lower value in 37011600000 results in faster thermal response to overcurrent conditions. This difference is within the design tolerance for fast-blow fuses and does not affect direct substitution eligibility, but should be considered if precise thermal matching to the original design is critical.

Q: Are there packaging differences between these parts?

A: Yes. The main part (066201.6ZRLL) is supplied in Tape & Reel (TR) packaging. The substitute 37011600000 is supplied in Cut Tape (CT) packaging, and 0034.6016 is supplied in Bulk packaging. These differences affect procurement and handling but do not impact electrical or mechanical compatibility.

Q: Which substitute part has the closest physical dimensions to the original?

A: The 0034.6016 (SCHURTER) has dimensions of 0.335" Dia x 0.335" H, which most closely matches the original 0.335" Dia x 0.333" H specification. The 37011600000 has a slightly reduced height of 0.315" H, which remains compatible with standard through-hole PCB layouts but may require verification in space-constrained applications.

Q: What certifications should I verify for my specific application?

A: The main part carries CSA, SEMKO, UL, and VDE approvals. The 37011600000 substitute carries CCC, cURus, PSE, SEMKO, and VDE approvals. The 0034.6016 substitute carries CCC, cURus, and VDE approvals. Confirm that the substitute part's certification set meets your regional and application-specific requirements.