Littelfuse 40014000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 40014000000 is a 4A 250VAC board mount radial fuse designed for through-hole applications. This slow-blow fuse is part of the TE5® 400 series and is actively manufactured. Substitute parts may be required due to inventory constraints, design revisions, or supply chain considerations while maintaining equivalent electrical and mechanical performance.

Substiute Parts

40014000000

Littelfuse Inc.In Stock: 169840014000000 Datasheet

Current PartRFQ

39214000000

Littelfuse Inc.In Stock: 34970339214000000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 39214000000 qualifies as a parametric equivalent to the 40014000000 based on the following critical substitution criteria:

• Current Rating: Both parts are rated at 4 A
• Voltage Rating: Both parts are rated at 250 V AC
• Response Time: Both parts are slow-blow fuses
• Mounting Type: Both are through-hole mounted
• Package / Case: Both use radial, box configuration
• Physical Dimensions: Identical at 0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm)
• Operating Temperature: Both operate across -40°C ~ 125°C
• RoHS Compliance: Both are ROHS3 compliant

The 39214000000 belongs to the TE5® 392 series, representing a design variant within the same product family with equivalent functional performance for board mount fuse applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 40014000000 and 39214000000 are active products manufactured by Littelfuse Inc. and carry equivalent regulatory approvals including CQC, cULus/cURus, KC, PSE/JET, and VDE certifications. Both parts meet ROHS3 compliance and REACH unaffected status, making them suitable for equivalent circuit protection applications.

The 40014000000 (TE5® 400 series) provides a breaking capacity of 130A with a melting I²t of 133.4. The 39214000000 (TE5® 392 series) provides a breaking capacity of 40A with a melting I²t of 100. Selection between these parts should be based on the specific breaking capacity and thermal characteristics required by the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the 39214000000 be used as a direct replacement for the 40014000000?

A: Both parts share identical electrical ratings (4A, 250VAC), response time (slow-blow), mounting configuration (through-hole radial), and physical dimensions. However, they differ in breaking capacity (130A vs. 40A) and melting I²t characteristics. Substitution is valid only if the application circuit does not require the higher breaking capacity of the 40014000000.

Q: Are the physical dimensions identical between these two parts?

A: Yes. Both the 40014000000 and 39214000000 have identical dimensions of 0.335" L x 0.157" W x 0.315" H (8.50mm x 4.00mm x 8.00mm), ensuring mechanical compatibility in board mount through-hole applications.

Q: What is the difference between the TE5® 400 and TE5® 392 series?

A: Both series are Littelfuse board mount fuse families. The primary differences lie in breaking capacity and thermal characteristics. The TE5® 400 series (40014000000) offers higher breaking capacity at 130A, while the TE5® 392 series (39214000000) provides 40A breaking capacity.

Q: Do both parts meet the same regulatory standards?

A: Both parts are certified by CQC, cULus/cURus, KC, PSE/JET, and VDE. Both are ROHS3 compliant and REACH unaffected. The 39214000000 carries an additional MSL rating of 1 (Unlimited).

Q: What is the DC cold resistance difference between these parts?

A: The 40014000000 has a DC cold resistance of 0.0124 Ohms, while the 39214000000 has 0.0128 Ohms. This minimal difference (0.0004 Ohms) is negligible for most circuit protection applications.