Littelfuse 0491002.MAT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0491002.MAT1 is a 2 A, 125 V AC/DC board mount axial fuse with fast blow response characteristics. This component is classified as Active product status and is designed for through-hole mounting applications requiring reliable overcurrent protection in industrial and commercial electronics. Substitute parts become necessary when the original packaging format (Tape & Box) is unavailable or when alternative series variants with enhanced certifications and improved availability are required for production continuity.

Substiute Parts

0491002.MAT1

Littelfuse Inc.In Stock: 8720491002.MAT1 Datasheet

Current PartRFQ

0251002.HAT1L

Littelfuse Inc.In Stock: 20820251002.HAT1L Datasheet

Parametric EquivalentRFQ

0251002.MAT1L

Littelfuse Inc.In Stock: 48050251002.MAT1L Datasheet

Parametric EquivalentRFQ

0251002.NAT1L

Littelfuse Inc.In Stock: 73630251002.NAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The three substitute parts (0251002.HAT1L, 0251002.MAT1L, 0251002.NAT1L) are parametric equivalents to the main part 0491002.MAT1. Substitution is valid based on the following matching criteria:

• Current Rating: 2 A (identical across all parts)
• Voltage Rating: 125 V AC / 125 V DC (identical across all parts)
• Response Time: Fast Blow (identical across all parts)
• Mounting Type: Through Hole (identical across all parts)
• Package / Case: Axial (identical across all parts)
• Physical Dimensions: 0.110" Dia x 0.280" L (identical across all parts)
• DC Cold Resistance: 0.0473 Ohms (identical across all parts)
• Operating Temperature Range: -55°C ~ 125°C (identical across all parts)
• RoHS Status: ROHS3 Compliant (identical across all parts)

The substitute parts differ from the main part in series designation (PICO® II 251 vs. PICO® II 491), packaging format (Cut Tape vs. Tape & Box), and regulatory certifications. All substitute parts maintain electrical and mechanical compatibility with the original specification.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (0251002.HAT1L, 0251002.MAT1L, 0251002.NAT1L) are electrically and mechanically equivalent to the main part 0491002.MAT1 for applications requiring 2 A, 125 V AC/DC fast blow fuse protection. The substitute parts belong to the PICO® II 251 series and offer expanded regulatory certifications including CCC, cURus, and TUV in addition to the CSA and PSE certifications present on the original part.

Selection between substitute parts should be based on packaging requirements and inventory availability. The 0251002.MAT1L variant offers the highest stock level (4748 pcs) and represents the optimal choice for high-volume production requirements. The 0251002.NAT1L variant provides the largest available inventory (7322 pcs) if extended supply assurance is required. All substitute parts maintain identical electrical performance and thermal characteristics within the specified operating temperature range of -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can the substitute parts be used as direct replacements for the 0491002.MAT1 in existing designs?

A: Yes. The substitute parts maintain identical current rating (2 A), voltage rating (125 V AC/DC), response time (Fast Blow), physical dimensions (0.110" Dia x 0.280" L), and DC cold resistance (0.0473 Ohms). Through-hole axial mounting compatibility is preserved across all parts.

Q: What is the difference between the main part and substitute parts?

A: The primary differences are series designation (PICO® II 491 vs. PICO® II 251), packaging format (Tape & Box vs. Cut Tape), and regulatory certifications. The substitute parts include additional approvals (CCC, cURus, TUV) and specify enhanced breaking capacity for DC applications (300A DC vs. unspecified on the main part).

Q: Are there any temperature or environmental limitations when using substitute parts?

A: No. All parts operate within the identical temperature range of -55°C to 125°C and maintain ROHS3 compliance and REACH Unaffected status.

Q: Which substitute part should be selected for new production designs?

A: Selection should prioritize inventory availability and packaging requirements. The 0251002.MAT1L and 0251002.NAT1L variants offer superior stock levels compared to the original part, supporting production continuity and lead-time reduction.

Q: Do the substitute parts require any design modifications or PCB layout changes?

A: No. Identical physical dimensions and through-hole mounting characteristics ensure direct compatibility without design modifications.