Littelfuse 0663.080ZRLL Equivalent & Substitute Parts

Part Overview

The Littelfuse 0663.080ZRLL is an 80 mA, 250 V AC board mount fuse with slow blow response time, housed in a radial can vertical package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure reliable circuit protection without design modification.

Substiute Parts

0663.080ZRLL

Littelfuse Inc.In Stock: 8220663.080ZRLL Datasheet

Current PartRFQ

37200800001

LittelfuseIn Stock: 748437200800001 Datasheet

DirectRFQ

0034.6604

SCHURTER Inc.In Stock: 14860034.6604 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0663.080ZRLL is determined by strict equivalence across the following parameters: current rating (80 mA), AC voltage rating (250 V), response time classification (slow blow), mounting configuration (through hole), and physical package form (radial can vertical). All identified substitutes maintain these core electrical and mechanical specifications. Variations in melting I²t, DC cold resistance, and dimensional tolerances within the specified package envelope do not preclude functional substitution. Differences in approval agencies and operating temperature ranges are noted but do not affect primary circuit protection function when the substitute operates within the application's thermal environment.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 37200800001 is an active product from the same manufacturer (Littelfuse TR5® 372 series) with identical electrical ratings and mechanical compatibility. This part is the primary substitute for the obsolete 0663.080ZRLL, offering superior availability and ongoing manufacturer support. The SCHURTER 0034.6604 (MST 250 series) provides an alternative from a different manufacturer with equivalent AC ratings and extended operating temperature range (-55°C ~ 125°C). Both substitutes maintain ROHS3 compliance and are suitable for direct replacement in applications requiring 80 mA, 250 V AC circuit protection with slow blow response. Selection between the two substitutes should be based on application thermal requirements and preferred supplier qualification.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37200800001 directly replace the obsolete 0663.080ZRLL? A: Yes. Both parts share identical current rating (80 mA), AC voltage rating (250 V), response time (slow blow), mounting type (through hole), and package form (radial can vertical). The 37200800001 is an active product with equivalent electrical performance.

Q: What is the difference in melting I²t between the main part and substitutes? A: The 0663.080ZRLL and SCHURTER 0034.6604 both specify 0.06 melting I²t, while the Littelfuse 37200800001 specifies 0.0384. This variation reflects different thermal response characteristics within the same current and voltage class but does not affect substitution eligibility for the specified 80 mA rating.

Q: Are there dimensional differences between the three parts? A: Minor dimensional variations exist within the radial can vertical package envelope. The 0663.080ZRLL measures 0.335" Dia x 0.333" H, the 37200800001 measures 0.335" Dia x 0.315" H, and the 0034.6604 measures 0.335" Dia x 0.335" H. All three fit standard through-hole fuse footprints designed for this package class.

Q: Does the SCHURTER 0034.6604 offer advantages over the Littelfuse substitute? A: The SCHURTER part provides a 125 V DC rating (not specified for the original part) and extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). Selection depends on whether the application requires DC voltage protection or operates in extreme temperature environments.

Q: What approval agencies certify these substitute parts? A: The Littelfuse 37200800001 carries CCC, cURus, SEMKO, and VDE approvals. The SCHURTER 0034.6604 carries CCC, cURus, KC, and VDE approvals. Both meet international safety standards suitable for circuit protection applications.

Q: Are all three parts ROHS3 compliant? A: Yes. The 0663.080ZRLL, 37200800001, and 0034.6604 are all ROHS3 compliant, meeting environmental and hazardous substance restrictions for electronic components.