Equivalent & Substitute Parts for Littelfuse 06643.15ZRLL

Part Overview

The Littelfuse 06643.15ZRLL is a 3.15 A, 250 V AC/DC board mount radial fuse with slow blow response characteristics. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production support and design updates. The LT-5™ 664 series fuse provides protection in through-hole radial configurations with a breaking capacity of 100 A at rated voltage.

Substiute Parts

06643.15ZRLL

Littelfuse Inc.In Stock: 108606643.15ZRLL Datasheet

Current PartRFQ

38213150000

Littelfuse Inc.In Stock: 5905338213150000 Datasheet

DirectRFQ

0034.6920

SCHURTER Inc.In Stock: 23980034.6920 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 06643.15ZRLL is determined by strict equivalence across the following parameters:

• Current Rating: 3.15 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)
• Fuse Type: Board Mount, Radial, Can, Vertical configuration (exact match required)
• Breaking Capacity: 100 A (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The two substitute parts listed—Littelfuse 38213150000 and SCHURTER 0034.6920—meet all mandatory electrical and mechanical parameters. Both are active products with current manufacturing status, providing viable alternatives to the obsolete 06643.15ZRLL.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing availability, addressing the obsolescence of the 06643.15ZRLL. Selection between the two substitutes should be based on the following factors:

Littelfuse 38213150000 (TR5® 382 Series): This part maintains Littelfuse manufacturing continuity and is available in higher inventory quantities (59,030 pcs). It carries approvals from CCC, cURus, KC, PSE/JET, SEMKO, and VDE. The melting I²t value of 45.35 is lower than the original part, indicating faster thermal response within the slow blow classification. Height dimension is 8.00mm, which is 0.45mm shorter than the original.

SCHURTER 0034.6920 (MXT 250 Series): This part offers cross-manufacturer sourcing and is available in moderate inventory (2,388 pcs). It carries approvals from CCC, cURus, KC, PSE/JET, and VDE. The melting I²t value of 57 matches the original part exactly, and the height dimension of 8.50mm is identical to the original specification.

Both parts comply with ROHS3 requirements and operate within the specified temperature range of -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 38213150000 be used as a direct replacement for the 06643.15ZRLL?

A: Yes. The 38213150000 meets all mandatory electrical parameters: 3.15 A current rating, 250 V AC voltage rating, slow blow response, 100 A breaking capacity, and through-hole radial mounting. The primary difference is the melting I²t value (45.35 vs. 57), which indicates slightly faster thermal response while remaining within the slow blow classification. Physical height is 8.00mm versus 8.45mm for the original.

Q: Can the SCHURTER 0034.6920 be used as a direct replacement for the 06643.15ZRLL?

A: Yes. The 0034.6920 meets all mandatory electrical parameters and maintains identical melting I²t (57) and physical height (8.50mm) characteristics. It provides cross-manufacturer sourcing from SCHURTER Inc. with equivalent performance specifications.

Q: What are the key differences between the two substitute parts?

A: Both substitutes meet all electrical requirements. The Littelfuse 38213150000 has a lower melting I²t (45.35) and shorter height (8.00mm), while the SCHURTER 0034.6920 matches the original melting I²t (57) and height (8.50mm). Littelfuse offers higher inventory availability; SCHURTER provides cross-manufacturer redundancy.

Q: Are there packaging differences between these parts?

A: Yes. The Littelfuse 38213150000 is supplied in Cut Tape (CT) packaging, while the SCHURTER 0034.6920 is supplied in Bulk packaging. The original 06643.15ZRLL packaging type was not specified in available documentation.

Q: Do all three parts carry the same regulatory approvals?

A: All three parts carry CCC, VDE, and SEMKO approvals. The Littelfuse 38213150000 additionally carries cURus, KC, and PSE/JET approvals. The SCHURTER 0034.6920 carries cURus, KC, and PSE/JET approvals. All are ROHS3 compliant.

Q: What is the significance of the melting I²t difference?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The original part and SCHURTER substitute both have I²t = 57. The Littelfuse substitute has I²t = 45.35, indicating faster thermal response. Both remain classified as slow blow fuses and meet the 3.15 A current rating specification.