Littelfuse 0459.750ER Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0459.750ER is a 750 mA, 125 V AC/DC surface mount board mount fuse in the PICO® 459 series. This fast-blow fuse is designed for circuit protection in applications requiring compact, reliable overcurrent protection with fast response characteristics. The part is actively manufactured and maintained in production status, ensuring long-term availability and supply chain stability. Identifying equivalent and substitute parts is essential for design flexibility, supply chain redundancy, and procurement optimization when the primary part number becomes unavailable or when alternative sourcing is required.

Substiute Parts

0459.750ER

Littelfuse Inc.In Stock: 9880459.750ER Datasheet

Current PartRFQ

0459.750UR

Littelfuse Inc.In Stock: 12500459.750UR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 0459.750ER are identified based on strict electrical and mechanical parameter matching within the PICO® 459 series. The substitution criteria are:

• Current Rating: 750 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: Surface Mount (exact match required)
• Package / Case: 2-SMD, J-Lead (exact match required)
• Breaking Capacity: 50 A AC, 300 A DC (exact match required)
• Melting I²t: 0.155 (exact match required)
• DC Cold Resistance: 0.175 Ohms (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Physical Dimensions: 0.285" L x 0.170" W x 0.120" H (exact match required)
• Approval Agencies: CSA, UL (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Parts meeting all these criteria are considered direct parametric equivalents and may be substituted without circuit redesign or re-qualification.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0459.750UR is a direct parametric equivalent to the 0459.750ER. Both parts are manufactured by Littelfuse Inc., belong to the PICO® 459 series, and maintain active production status. All electrical characteristics, mechanical dimensions, thermal specifications, and regulatory certifications are identical. Both parts carry CSA and UL approvals and comply with ROHS3 requirements, ensuring regulatory compliance across applications.

Selection between these parts may be based on procurement availability, lead time, packaging quantity requirements, or supply chain considerations. The 0459.750UR currently maintains higher inventory levels (1230 Pcs) compared to the 0459.750ER (972 Pcs), which may influence sourcing decisions for high-volume applications or time-sensitive projects.

Frequently Asked Questions (FAQ)

Q: Can the 0459.750UR be used as a direct replacement for the 0459.750ER in existing designs?

A: Yes. The 0459.750UR is a direct parametric equivalent with identical electrical ratings (750 mA, 125 V AC/DC), response characteristics (fast blow), breaking capacity (50 A AC, 300 A DC), physical dimensions (0.285" L x 0.170" W x 0.120" H), and regulatory certifications (CSA, UL). No circuit redesign or re-qualification is required.

Q: Are there any differences in thermal performance between these parts?

A: No. Both parts operate across the identical temperature range (-55°C to 125°C) and maintain the same DC cold resistance (0.175 Ohms) and melting I²t value (0.155).

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both the 0459.750ER and 0459.750UR are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Are there packaging differences between these substitute parts?

A: Both parts are supplied in Tape & Reel (TR) packaging with identical 2-SMD, J-Lead case configuration, ensuring compatibility with standard surface mount assembly processes.

Q: What regulatory certifications apply to both parts?

A: Both parts carry CSA and UL approvals and comply with ROHS3 requirements. REACH status is unaffected for both parts, and both are classified under ECCN EAR99 and HTSUS 8536.10.0040.