Littelfuse 0154.630DRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0154.630DRL is a 630 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 a 50A breaking capacity at rated voltage. The part is actively manufactured and widely stocked, with 808 units available in inventory. Equivalent substitute parts are identified to support procurement flexibility, supply chain continuity, and design alternatives when the primary part number becomes unavailable or when inventory constraints require alternative sourcing.

Substiute Parts

0154.630DRL

LittelfuseIn Stock: 8310154.630DRL Datasheet

Current PartRFQ

0154.630DR

Littelfuse Inc.In Stock: 34870154.630DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0154.630DRL are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

• Current Rating: 630 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Board Mount, Requires Holder, Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block with Holder (exact match required)
• Physical Dimensions: 0.383" L x 0.198" W x 0.150" H (exact match required)
• Breaking Capacity: 50A @ Rated Voltage (exact match required)
• Melting I²t: 0.143 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• DC Cold Resistance: 0.305 Ohms (exact match required)

The substitute part 0154.630DR meets all critical electrical and mechanical parameters, ensuring direct functional equivalence and PCB-level compatibility without design modification.

Parameter Comparison

Engineering Selection Recommendations

Both the 0154.630DRL and 0154.630DR are active products from Littelfuse with identical electrical and mechanical specifications. The 0154.630DRL carries dual agency approval (CSA and UL), while the 0154.630DR carries UL approval. Selection between these parts should be based on specific application requirements regarding regulatory compliance. Applications requiring CSA certification must use the 0154.630DRL. Applications requiring only UL certification may use either part. Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, suitable for standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the 0154.630DR be used as a direct replacement for the 0154.630DRL?

A: The 0154.630DR is electrically and mechanically equivalent to the 0154.630DRL. However, the 0154.630DRL carries CSA approval in addition to UL approval. If your application or regional regulations require CSA certification, the 0154.630DRL must be used. If only UL certification is required, the 0154.630DR is a valid substitute.

Q: Are there any physical differences between these parts?

A: No. Both parts share identical physical dimensions (0.383" L x 0.198" W x 0.150" H), package type (2-SMD, Square End Block with Holder), and mounting requirements (Requires Holder, Surface Mount).

Q: Do these parts require a specific holder for installation?

A: Yes. Both the 0154.630DRL and 0154.630DR are board mount fuses that require a compatible fuse holder for surface mount installation. The holder must be rated for 2-SMD, Square End Block configuration.

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

A: The series designation difference (154L vs. 154) reflects internal Littelfuse product line organization. Both parts maintain identical electrical and mechanical specifications for the 630 mA, 125 V AC/DC fast-blow fuse category.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the 0154.630DRL and 0154.630DR operate across the identical temperature range of -55°C to 125°C.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t value of 0.143 represents the thermal energy required to melt the fuse element. This parameter ensures consistent fuse response time and protection characteristics. Both parts have identical melting I²t values, confirming equivalent protection performance.