Littelfuse 42014000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 42014000000 is a 4A 125VAC/80VDC board mount fuse in 2410 (6125 Metric) surface mount package with slow blow response characteristics. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 125°C and meets cURus approval standards.

Substiute Parts

42014000000

Littelfuse Inc.In Stock: 119042014000000 Datasheet

Current PartRFQ

0452004.MRL

Littelfuse Inc.In Stock: 430300452004.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 42014000000 is determined by the following critical parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 125 V (exact match required)
• Voltage Rating - DC: minimum 80 V (equal or higher acceptable)
• Response Time: Slow Blow (exact match required)
• Fuse Type: Board Mount, Surface Mount configuration
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Certifications: Must maintain equivalent safety standards

The substitute part 0452004.MRL meets all critical substitution criteria. It maintains identical current and AC voltage ratings, exceeds the DC voltage requirement (125V vs. 80V), preserves slow blow response characteristics, and operates within the same temperature range. The substitute uses a 2-SMD, Square End Block package configuration, which is mechanically compatible with the original 2410 (6125 Metric) footprint for surface mount applications.

Parameter Comparison

Engineering Selection Recommendations

The 0452004.MRL from Littelfuse NANO²® 452 series is the direct substitute for the obsolete 42014000000. Selection is based on the following engineering factors:

Product Status & Availability: The 42014000000 is obsolete with no ongoing production. The 0452004.MRL is active with 42,923 pieces in stock, ensuring supply chain continuity.

Electrical Compatibility: The substitute maintains identical current (4A) and AC voltage (125V) ratings. The DC voltage rating increases from 80V to 125V, which is a conservative design improvement that does not compromise circuit protection. The slow blow response time is preserved, maintaining the same overcurrent protection behavior.

Compliance & Certifications: The 0452004.MRL holds CSA, PSE, and UR approvals, providing broader international certification coverage compared to the original cURus approval. The substitute achieves ROHS3 compliance, meeting current environmental standards, whereas the original is RoHS non-compliant.

Mechanical & Thermal Characteristics: Both parts operate across -55°C to 125°C. The substitute's 2-SMD, Square End Block package is mechanically compatible with the original 2410 (6125 Metric) surface mount footprint. Physical dimensions are nearly identical (0.240" L x 0.106" W x 0.106" H vs. 0.240" L x 0.109" W x 0.109" H), with negligible differences suitable for direct PCB replacement.

Performance Parameters: The substitute exhibits a higher melting I²t value (34.4 vs. 30) and equal or superior breaking capacity (50A vs. 35A AC/50A DC), indicating enhanced performance margins.

Frequently Asked Questions (FAQ)

Q: Can the 0452004.MRL directly replace the 42014000000 on existing PCBs?

A: Yes. Both parts are surface mount board mount fuses with identical current and AC voltage ratings, matching slow blow response, and nearly identical physical dimensions. The 2-SMD, Square End Block package of the substitute is mechanically compatible with the original 2410 (6125 Metric) footprint.

Q: What is the significance of the higher DC voltage rating on the substitute?

A: The 0452004.MRL's 125V DC rating versus the original 80V DC rating represents a design improvement. This higher rating does not affect circuit protection behavior but provides additional safety margin in DC applications. The fuse will still operate identically at the circuit's actual voltage.

Q: Does the substitute meet the same safety standards?

A: The 0452004.MRL holds CSA, PSE, and UR certifications, providing broader international approval coverage than the original cURus approval. Both parts meet the safety requirements for board mount fuses in their respective markets.

Q: Why is the melting I²t value higher on the substitute?

A: The I²t value of 34.4 (vs. 30 on the original) indicates the thermal energy required to melt the fuse element. The higher value on the substitute reflects its enhanced thermal design while maintaining identical slow blow response characteristics and current rating.

Q: Is the substitute RoHS compliant?

A: Yes. The 0452004.MRL is ROHS3 compliant, meeting current environmental regulations. The original 42014000000 is RoHS non-compliant, making the substitute preferable for new designs and markets with RoHS requirements.

Q: What packaging options are available for the substitute?

A: The 0452004.MRL is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, suitable for both manual and automated assembly processes.