Littelfuse 0154.400DRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0154.400DRL is a 400 mA, 125 V AC/DC surface mount board mount fuse in the OMNI-BLOK® 154L series. This fast-blow fuse is designed for circuit protection in applications requiring reliable overcurrent protection with rapid response characteristics. The part is actively manufactured and maintained in production inventory. Equivalent substitute parts may be required due to supply chain availability, inventory allocation, or specific procurement requirements while maintaining identical electrical and mechanical performance.

Substiute Parts

0154.400DRL

Littelfuse Inc.In Stock: 11410154.400DRL Datasheet

Current PartRFQ

0154.400DR

Littelfuse Inc.In Stock: 46120154.400DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0154.400DRL is determined by strict equivalence across the following critical parameters:

Current Rating: 400 mA (exact match required) Voltage Rating: 125 V AC and 125 V DC (exact match required) Response Time: Fast Blow (exact match required) Mounting Type: Requires Holder, Surface Mount (exact match required) Package / Case: 2-SMD, Square End Block with Holder (exact match required) Breaking Capacity: 50 A @ Rated Voltage (exact match required) Melting I²t: 0.0484 (exact match required) Operating Temperature Range: -55°C ~ 125°C (exact match required) DC Cold Resistance: 0.56 Ohms (exact match required) Physical Dimensions: 0.383" L x 0.198" W x 0.150" H (exact match required)

The substitute part 0154.400DR meets all critical electrical and mechanical parameters and is therefore a direct parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 0154.400DRL and 0154.400DR are active production parts from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts should be based on:

Inventory availability and procurement lead times Approval agency requirements: The 0154.400DRL carries both CSA and UL approvals, while the 0154.400DR carries UL approval. Applications requiring CSA certification must use the 0154.400DRL. Series designation: The 0154.400DRL belongs to the OMNI-BLOK® 154L series, while the 0154.400DR belongs to the OMNI-BLOK® 154 series. Both series maintain identical parametric performance for this current and voltage rating. Supply chain considerations: The 0154.400DR maintains higher inventory levels (4564 Pcs vs. 1068 Pcs), which may influence procurement strategy.

Both parts are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings, making them suitable for standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 0154.400DR be used as a direct replacement for the 0154.400DRL in all applications?

A: The 0154.400DR is a parametric equivalent with identical electrical and mechanical specifications. However, if your application or regulatory requirement specifies CSA certification, the 0154.400DRL must be used, as the 0154.400DR carries only UL approval.

Q: What is the difference between the OMNI-BLOK® 154L and OMNI-BLOK® 154 series?

A: Both series maintain identical electrical and mechanical performance for the 400 mA, 125 V rating specified. The series designation reflects product line organization within Littelfuse's portfolio. Selection between series should be based on approval agency requirements and procurement availability.

Q: Are there any physical or dimensional differences between these parts?

A: No. Both parts share identical dimensions of 0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm) and are packaged in the same 2-SMD, Square End Block with Holder configuration.

Q: What is the significance of the DC Cold Resistance specification?

A: The DC Cold Resistance of 0.56 Ohms is identical for both parts and represents the resistance of the fuse element at room temperature. This parameter is critical for circuit design calculations and power dissipation analysis.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. Both the 0154.400DRL and 0154.400DR are rated for 125 V AC and 125 V DC operation, making them suitable for dual-voltage applications within the specified voltage range.

Q: What does the Melting I²t value of 0.0484 indicate?

A: The Melting I²t value represents the thermal energy required to melt the fuse element. This parameter is used in circuit protection calculations to ensure proper coordination with upstream protective devices and to verify that the fuse will operate within design specifications.

Q: Are these parts suitable for automated surface mount assembly?

A: Yes. Both parts are classified as MSL 1 (Unlimited), indicating they have unlimited shelf life and do not require special moisture control during storage or assembly. They are designed for standard surface mount processes with the 2-SMD, Square End Block with Holder package configuration.