Littelfuse 37001000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37001000000 is a 100 mA, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in TR5® 370 series applications. This component is currently active in production with 2,300 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameters, ensuring seamless integration into existing circuit designs without performance degradation.

Substiute Parts

37001000000

Littelfuse Inc.In Stock: 240037001000000 Datasheet

Current PartRFQ

37301000000

Littelfuse Inc.In Stock: 413937301000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 37301000000 qualifies as a parametric equivalent to the 37001000000 based on the following critical substitution criteria:

• Current Rating: Both parts rated at 100 mA
• Voltage Rating (AC): Both rated at 250 V
• Response Time: Both classified as Fast Blow
• Mounting Type: Both are Through Hole mounted
• Package / Case: Both use Radial, Can, Vertical configuration
• Physical Dimensions: Identical at 0.335" Dia x 0.315" H (8.50mm x 8.00mm)
• Operating Temperature: Both operate across -40°C ~ 85°C
• RoHS Compliance: Both ROHS3 Compliant

These parameters define the functional and mechanical interchangeability of board mount fuses in this category. Differences in breaking capacity, melting I²t, and approval agencies do not affect substitution eligibility when the primary electrical and mechanical specifications remain constant.

Parameter Comparison

Engineering Selection Recommendations

Both the 37001000000 and 37301000000 are active production components from Littelfuse Inc., each carrying distinct regulatory certifications. The 37001000000 holds CCC, cURus, SEMKO, and VDE approvals, while the 37301000000 carries CSA and cULus certifications. Selection between these parts should be based on the specific regulatory requirements of the target application and end-use market. The higher breaking capacity (50A) and lower melting I²t (0.0013) of the 37301000000 represent design improvements within the TR5® 373 series, while maintaining full electrical and mechanical compatibility with applications designed for the TR5® 370 series.

Frequently Asked Questions (FAQ)

Q: Can the 37301000000 directly replace the 37001000000 in existing designs?

A: Yes. Both parts share identical current rating (100 mA), voltage rating (250 V), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), and physical dimensions (0.335" Dia x 0.315" H). Direct substitution is mechanically and electrically compatible.

Q: What is the difference between the TR5® 370 and TR5® 373 series?

A: The TR5® 373 series (37301000000) features improved breaking capacity (50A vs. 35A) and faster melting characteristics (I²t of 0.0013 vs. 0.0038) compared to the TR5® 370 series (37001000000). Both series maintain the same form factor and electrical ratings.

Q: Are there regulatory compliance differences between these parts?

A: Yes. The 37001000000 carries CCC, cURus, SEMKO, and VDE certifications, while the 37301000000 carries CSA and cULus certifications. Application requirements and target markets should determine which certifications are necessary.

Q: Do these fuses have identical physical dimensions?

A: Yes. Both parts measure 0.335" Dia x 0.315" H (8.50mm x 8.00mm) and use identical radial, can, vertical packaging, ensuring mechanical interchangeability in through-hole PCB applications.

Q: What is the operating temperature range for both parts?

A: Both the 37001000000 and 37301000000 operate across -40°C to 85°C, providing equivalent thermal performance across standard industrial and commercial temperature ranges.