Equivalent & Substitute Parts for 1812L270SLPR

Part Overview

The 1812L270SLPR is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, rated for 6V with a 2.7A hold current. This component is classified as Obsolete, which necessitates identification of active substitute parts to maintain design continuity and ensure supply chain availability. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter tolerances for this 1812 (4532 Metric) surface mount package category.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	2.7 A
Current - Trip (It)	6.2 A
Current - Max	50 A
Time to Trip	2 s
Resistance - Initial (Ri) (Min)	3 mOhms
Resistance - Post Trip (R1) (Max)	22 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	1812 (4532 Metric), Concave
Size / Dimension	0.179" L x 0.128" W (4.55mm x 3.24mm)
Thickness (Max)	0.028" (0.70mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 1812L270SLPR is determined by the following critical parameters:

Voltage Rating: Maximum voltage must equal or exceed 6V
Current - Hold (Ih): Must support 2.7A nominal operation
Current - Trip (It): Must align with 6.2A trip threshold
Package / Case: Must be 1812 (4532 Metric), Concave surface mount
Physical Dimensions: Length 0.179" (4.55mm), Width 0.128" (3.24mm), Thickness 0.028" (0.70mm)
Operating Temperature Range: Must support -40°C ~ 85°C
Certifications: cURus and TUV approval required
RoHS Compliance: ROHS3 Compliant status required

Two substitute parts meet these criteria with active product status and full compliance to the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	1812L270SLPR (Main)	1812L260SLPR (Substitute)	PTSLR18126V270 (Substitute)
Manufacturer	Littelfuse	Littelfuse Inc.	Eaton - Electronics Division
Product Status	Obsolete	Active	Active
Voltage - Max	6V	6V	6V
Current - Hold (Ih) (Max)	2.7 A	2.6 A	2.7 A
Current - Trip (It)	6.2 A	6 A	6.2 A
Current - Max	50 A	50 A	50 A
Time to Trip	2 s	2 s	2 s
Resistance - Initial (Ri) (Min)	3 mOhms	3 mOhms	3 mOhms
Resistance - Post Trip (R1) (Max)	22 mOhms	24 mOhms	23 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave
Size / Dimension	0.179" L x 0.128" W (4.55mm x 3.24mm)	0.179" L x 0.128" W (4.55mm x 3.24mm)	0.179" L x 0.128" W (4.55mm x 3.24mm)
Thickness (Max)	0.028" (0.70mm)	0.028" (0.70mm)	0.028" (0.70mm)
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2A (4 Weeks)
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

1812L260SLPR (Littelfuse Inc.)

This substitute maintains active product status with ROHS3 compliance and cURus/TUV certifications. The Current - Hold (Ih) rating of 2.6A is 0.1A lower than the main part, and the Current - Trip (It) is 6A versus 6.2A. Post-trip resistance is 24 mOhms maximum, compared to 22 mOhms for the original. Moisture Sensitivity Level remains at 1 (Unlimited), matching the main part specification. This part is available in Tape & Reel packaging.

PTSLR18126V270 (Eaton - Electronics Division)

This substitute provides an exact match for Current - Hold (Ih) at 2.7A and Current - Trip (It) at 6.2A, maintaining identical electrical performance to the main part. All certifications (cURus, TUV) and RoHS3 compliance are met. Post-trip resistance is 23 mOhms maximum. The Moisture Sensitivity Level is rated 2A (4 Weeks), which differs from the main part's MSL 1 (Unlimited). This part is available in Tape & Reel packaging and carries active product status.

Frequently Asked Questions (FAQ)

Q: Can 1812L260SLPR be used as a direct replacement for 1812L270SLPR?

A: 1812L260SLPR is electrically compatible within the 1812 (4532 Metric) package category. The Current - Hold (Ih) is 2.6A versus 2.7A, and Current - Trip (It) is 6A versus 6.2A. These differences must be evaluated against circuit requirements. Both parts share identical voltage rating (6V), operating temperature range (-40°C ~ 85°C), and certifications (cURus, TUV, ROHS3).

Q: What is the difference between PTSLR18126V270 and 1812L270SLPR?

A: PTSLR18126V270 matches the main part in Current - Hold (Ih) at 2.7A and Current - Trip (It) at 6.2A. The primary difference is Moisture Sensitivity Level: PTSLR18126V270 is rated MSL 2A (4 Weeks), while 1812L270SLPR is MSL 1 (Unlimited). Both are surface mount 1812 (4532 Metric) packages with cURus/TUV certifications and ROHS3 compliance.

Q: Are both substitute parts available in the same packaging format?

A: Both 1812L260SLPR and PTSLR18126V270 are supplied in Tape & Reel (TR) packaging. The main part 1812L270SLPR does not specify packaging format in the available data.

Q: Do the substitute parts meet the same regulatory certifications?

A: Both substitute parts carry cURus and TUV approvals, matching the main part. Both are ROHS3 Compliant. ECCN and HTSUS classifications are identical across all three parts.

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

A: Selection depends on circuit-specific requirements. PTSLR18126V270 provides exact electrical parameter matching (2.7A Ih, 6.2A It) but requires MSL 2A handling (4-week shelf life). 1812L260SLPR offers MSL 1 (Unlimited) but with slightly lower current ratings (2.6A Ih, 6A It). Both are active products with full compliance certifications.

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