MF-USML650/6-2 Equivalent & Substitute Parts

Part Overview

The MF-USML650/6-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® series. This surface mount component is rated for 6V maximum voltage with a 6.5A hold current and is housed in a 1210 (3225 Metric) package with concave configuration. The part is active in production status with full RoHS3 compliance and cURus/TUV approval. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate qualified alternatives.

Substiute Parts

MF-USML650/6-2

Bourns Inc.In Stock: 3126MF-USML650/6-2 Datasheet

Current PartRFQ

PTSLR12106V650

Eaton - Electronics DivisionIn Stock: 4860PTSLR12106V650 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The PTSLR12106V650 manufactured by Eaton - Electronics Division qualifies as a direct substitute based on the following critical parameters:

Voltage rating matches at 6V maximum. Current hold (Ih) specification is identical at 6.5A. Current trip (It) is equivalent at 13A. Maximum current capacity matches at 50A. Initial resistance (Ri) and post-trip resistance (R1) specifications are identical. Operating temperature range is identical at -40°C to 85°C. Package configuration is 1210 (3225 Metric) with concave mounting. Surface mount technology is consistent. Thickness specification matches at 0.039" (1.00mm) maximum. Both parts carry cURus and TUV approval certifications. Both parts are RoHS3 compliant.

The substitute part exhibits a time-to-trip specification of 5 seconds compared to 2 seconds for the primary part. Physical dimensions show minor variation: the substitute measures 0.135" L x 0.110" W versus 0.127" L x 0.101" W for the primary part. These differences remain within acceptable tolerance for 1210 package footprints and do not preclude functional substitution in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Both the MF-USML650/6-2 and PTSLR12106V650 are active production parts with identical regulatory compliance status. Both carry cURus and TUV certifications and maintain RoHS3 compliance. Selection between these parts should be based on availability, lead time, and application-specific requirements regarding time-to-trip response. The MF-USML650/6-2 provides faster trip response at 2 seconds, while the PTSLR12106V650 offers a 5-second trip time. PCB layout considerations should account for the minor dimensional differences in the 1210 package footprint, though both parts are designed for standard 1210 land patterns.

Frequently Asked Questions (FAQ)

Q: Can PTSLR12106V650 be used as a direct replacement for MF-USML650/6-2?

A: Yes. Both parts share identical voltage, current hold, current trip, maximum current, resistance specifications, operating temperature range, package type, and mounting technology. The primary difference is the time-to-trip specification (5 seconds versus 2 seconds). Application requirements must accommodate this timing difference.

Q: What are the critical parameters for PTC resettable fuse substitution?

A: Voltage rating, hold current (Ih), trip current (It), maximum current capacity, initial resistance (Ri), post-trip resistance (R1), operating temperature range, and package configuration must match or be compatible with circuit requirements.

Q: Are there physical compatibility concerns between these parts?

A: Both parts use the 1210 (3225 Metric) concave package with 0.039" (1.00mm) maximum thickness. The PTSLR12106V650 has slightly larger planar dimensions (0.135" L x 0.110" W versus 0.127" L x 0.101" W). Standard 1210 PCB footprints accommodate both parts without modification.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both parts are RoHS3 compliant and carry cURus and TUV approval certifications. Both are rated for -40°C to 85°C operating temperature.

Q: What is the significance of the time-to-trip difference?

A: The MF-USML650/6-2 trips in 2 seconds while the PTSLR12106V650 trips in 5 seconds. Circuit protection timing requirements must be evaluated to determine which response time is appropriate for the application.