PSR-29138-C-2 Equivalent & Substitute Parts

Part Overview

The PSR-29138-C-2 is a PTC resettable fuse manufactured by Littelfuse Inc. This component is classified as obsolete, indicating it is no longer in active production. The PSR-29138-C-2 remains RoHS compliant and is available in limited inventory (970 pieces). Due to its obsolete status, identification of functionally equivalent active alternatives is necessary for ongoing design support, maintenance, and new production applications.

Substiute Parts

PSR-29138-C-2

Littelfuse Inc.In Stock: 996PSR-29138-C-2 Datasheet

Current PartRFQ

1206L400/12SLWR

Littelfuse Inc.In Stock: 63611206L400/12SLWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PSR-29138-C-2 is based on the following criteria derived from the provided parameters:

Primary Substitution Criteria:

• Manufacturer alignment (Littelfuse Inc.)
• Product category (PTC Resettable Fuse)
• RoHS compliance status
• ECCN and HTSUS classification consistency
• Active product status for long-term availability

The substitute part 1206L400/12SLWR meets these criteria as an active alternative from the same manufacturer within the same product category and regulatory framework.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The 1206L400/12SLWR is the designated substitute for the PSR-29138-C-2. This substitution is supported by:

1. Manufacturer Continuity: Both components are manufactured by Littelfuse Inc., ensuring design consistency and technical support alignment.

2. Regulatory Compliance: The substitute part maintains EAR99 and HTSUS 8533.40.8070 classification, with upgraded RoHS3 compliance status, meeting or exceeding the original part's regulatory requirements.

3. Product Status: The 1206L400/12SLWR holds active product status with significantly higher inventory availability (6308 pieces), ensuring long-term supply chain reliability compared to the obsolete PSR-29138-C-2.

4. Certification: The substitute part carries cURus and TUV approvals, providing third-party validation for safety and performance standards.

Selection Basis: Component selection should prioritize the 1206L400/12SLWR for new designs and production applications requiring PTC resettable fuse functionality. The PSR-29138-C-2 inventory may be retained for legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Why is the PSR-29138-C-2 classified as obsolete?

A: The PSR-29138-C-2 is no longer manufactured by Littelfuse Inc. and has been superseded by active product alternatives. Obsolete status indicates the part is not available for new orders from the manufacturer.

Q: What is the primary difference between the PSR-29138-C-2 and the 1206L400/12SLWR?

A: The 1206L400/12SLWR is an active product with specified electrical parameters (12V maximum voltage, 4A hold current, 8A trip current) and surface mount 1206 package configuration. The PSR-29138-C-2 technical specifications are not fully documented in available data.

Q: Can the 1206L400/12SLWR be used as a direct replacement?

A: The 1206L400/12SLWR is the designated substitute from Littelfuse Inc. for the PSR-29138-C-2. Substitution compatibility depends on circuit voltage and current requirements matching the substitute part's 12V/4A hold current specifications.

Q: What is the package type of the substitute part?

A: The 1206L400/12SLWR uses a 1206 (3216 Metric) surface mount package with concave configuration, measuring 3.20mm length × 1.65mm width × 1.40mm maximum thickness.

Q: Are there any compliance differences between the two parts?

A: The PSR-29138-C-2 is RoHS compliant. The 1206L400/12SLWR is ROHS3 compliant, representing an updated compliance standard. Both parts maintain EAR99 ECCN and 8533.40.8070 HTSUS classification.

Q: What certifications does the substitute part carry?

A: The 1206L400/12SLWR holds cURus and TUV approvals, providing independent verification of safety and performance standards.

Q: Is the substitute part available in the same packaging format?

A: The 1206L400/12SLWR is available in Cut Tape (CT) and Digi-Reel® packaging options. Original packaging format for the PSR-29138-C-2 is not specified in available documentation.