NANOSMD450LR-2 Equivalent & Substitute Parts

Part Overview

The NANOSMD450LR-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 6V at 4.5A hold current in a 1206 (3216 Metric) surface mount package. This component is classified as Obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 80°C and complies with ROHS3 standards.

Substiute Parts

NANOSMD450LR-2

Littelfuse Inc.In Stock: 882NANOSMD450LR-2 Datasheet

Current PartRFQ

1206L450SLWR

Littelfuse Inc.In Stock: 153771206L450SLWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NANOSMD450LR-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold rating: 4.5A
• Current trip rating: 9A
• Package type: 1206 (3216 Metric) surface mount
• Polymeric PTC resettable fuse technology
• ROHS3 compliance

The substitute part 1206L450SLWR meets all these core electrical and mechanical requirements, maintaining functional compatibility within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

The 1206L450SLWR is the direct substitute for the obsolete NANOSMD450LR-2. Both components are manufactured by Littelfuse Inc. and share identical electrical ratings across voltage, current hold, current trip, and time-to-trip specifications. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

The 1206L450SLWR provides improved moisture sensitivity characteristics (MSL 1 versus MSL 2A) and an extended operating temperature range to 85°C. Both parts maintain ROHS3 compliance and are certified by cURus and TUV approval agencies. The concave package variant of the substitute part is mechanically compatible with standard 1206 footprints used in the original design.

Frequently Asked Questions (FAQ)

Q: Can the 1206L450SLWR be used as a direct replacement for NANOSMD450LR-2?

A: Yes. Both parts share identical voltage (6V), current hold (4.5A), current trip (9A), and time-to-trip (2s) specifications. The 1206L450SLWR is electrically and mechanically compatible with the original design footprint.

Q: What are the differences between these two parts?

A: The primary differences are product status (Obsolete versus Active), initial resistance (2 mOhms versus 1 mOhms), post-trip resistance (8 mOhms maximum versus 14 mOhms maximum), operating temperature range (-40°C to 80°C versus -40°C to 85°C), and moisture sensitivity level (2A versus 1). The substitute part features a concave package variant.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant. The 1206L450SLWR carries additional cURus and TUV certifications and includes REACH Unaffected status. The substitute part has superior moisture handling characteristics with unlimited shelf life at MSL 1.

Q: Does the concave package variant affect PCB layout or assembly?

A: The concave package variant is mechanically compatible with standard 1206 surface mount footprints. No PCB layout modifications are required for substitution.

Q: Why is the NANOSMD450LR-2 marked as Obsolete?

A: The NANOSMD450LR-2 has reached end-of-life status. The 1206L450SLWR represents the current active equivalent from Littelfuse Inc. for this electrical specification class.