Littelfuse TR5® 382 38221000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 38221000000 is a 10 A, 250 V AC/DC board mount fuse in radial, can, vertical package configuration. This slow-blow fuse is designed for through-hole mounting applications requiring overcurrent protection in industrial and consumer electronics. The part is currently active in production with 5400 units in stock. Equivalent and substitute parts may be required due to inventory availability, lead time constraints, or specific application requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

38221000000

Littelfuse Inc.In Stock: 550438221000000 Datasheet

Current PartRFQ

37421000000

Littelfuse Inc.In Stock: 937237421000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 37421000000 qualifies as a parametric equivalent based on the following critical substitution criteria:

Matching Parameters (Substitution Basis):

• Current Rating: 10 A (identical)
• Voltage Rating (AC): 250 V (identical)
• Response Time: Slow Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Package / Case: Radial, Can, Vertical (identical)
• Size / Dimension: 0.335" Dia x 0.315" H (8.50mm x 8.00mm) (identical)
• Operating Temperature Range: -40°C ~ 85°C (identical)
• RoHS Status: ROHS3 Compliant (identical)

Differing Parameters (Non-Critical for Substitution):

• Series: TR5® 374 (different series designation)
• Breaking Capacity @ Rated Voltage: 50 A (vs. 100 A in main part)
• Melting I²t: 280 (vs. 365 in main part)
• DC Cold Resistance: 0.005 Ohms (vs. 0.0042 Ohms in main part)
• Approval Agency: cULus (vs. cURus, PSE/JET in main part)

The 37421000000 maintains electrical and mechanical compatibility for applications requiring 10 A, 250 V AC/DC slow-blow protection in through-hole radial configurations.

Parameter Comparison

Engineering Selection Recommendations

Both the 38221000000 and 37421000000 are active production parts from Littelfuse Inc. with ROHS3 compliance and identical electrical ratings (10 A, 250 V AC/DC, slow-blow response). Both parts share identical mechanical dimensions and through-hole mounting configuration, ensuring direct PCB compatibility.

The 38221000000 provides broader regulatory approval coverage (cURus, PSE/JET) and higher breaking capacity (100 A) with greater melting I²t (365). The 37421000000 offers higher inventory availability (9300 units vs. 5400 units) and cULus certification, with lower breaking capacity (50 A) and melting I²t (280).

Selection between these parts depends on specific regulatory requirements for the target application and approval agency certifications needed. Both parts are suitable for standard 10 A, 250 V AC/DC overcurrent protection applications with identical thermal and dimensional characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 37421000000 be used as a direct replacement for the 38221000000?

A: Yes, within applications requiring 10 A, 250 V AC/DC slow-blow protection in through-hole radial configurations. Both parts share identical electrical ratings, response time, mounting type, and physical dimensions (0.335" Dia x 0.315" H). Verify that the application's regulatory requirements align with the substitute part's approval certifications (cULus for 37421000000 vs. cURus, PSE/JET for 38221000000).

Q: What are the key differences between these two fuses?

A: The primary differences are breaking capacity (100 A vs. 50 A), melting I²t (365 vs. 280), DC cold resistance (0.0042 Ohms vs. 0.005 Ohms), and regulatory approvals. The 38221000000 has higher breaking capacity and broader certifications, while the 37421000000 has greater inventory availability.

Q: Are the physical dimensions identical?

A: Yes. Both parts are 0.335" diameter by 0.315" height (8.50mm x 8.00mm) in radial, can, vertical package configuration. PCB footprints and mounting holes are compatible.

Q: Do both parts operate across the same temperature range?

A: Yes. Both the 38221000000 and 37421000000 operate across -40°C to 85°C, ensuring thermal compatibility in equivalent applications.

Q: Which part should be selected for international applications?

A: The 38221000000 carries PSE/JET certification in addition to cURus, providing broader international regulatory coverage. The 37421000000 carries cULus certification. Selection depends on the specific regulatory requirements of the target market.