MF-LS190S Equivalent & Substitute Parts

Part Overview

The MF-LS190S is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 24V maximum voltage with a 1.9A hold current. This component is designed for circuit protection applications requiring automatic reset capability after fault conditions. The MF-LS190S is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

MF-LS190S

Bourns Inc.In Stock: 941MF-LS190S Datasheet

Current PartRFQ

MF-LS190

Bourns Inc.In Stock: 1062MF-LS190 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-LS190S is determined by electrical and mechanical parameter equivalence within the Bourns Multifuse® MF-LS series. The critical parameters governing substitutability are:

• Voltage rating: 24V maximum
• Hold current (Ih): 1.9A maximum
• Trip current (It): 4.2A
• Time to trip: 3 seconds
• Initial resistance (Ri): 30 mOhms minimum
• Post-trip resistance (R1): 100 mOhms maximum
• Operating temperature range: -40°C to 85°C
• Package type: Strap configuration
• Physical dimensions: 0.880" L x 0.417" W (22.35mm x 10.60mm)
• Regulatory compliance: cURus, TUV approval; ROHS3 compliant

The MF-LS190 is identified as a direct substitute based on identical electrical specifications and mechanical form factor. The primary distinction is product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The MF-LS190 is the appropriate substitute for the obsolete MF-LS190S. Both components maintain identical electrical and mechanical specifications, including voltage rating, current thresholds, resistance characteristics, and operating temperature range. The MF-LS190 carries active product status, ensuring continued availability and manufacturing support from Bourns Inc.

Both parts satisfy the same regulatory requirements: cURus and TUV approval certifications, and ROHS3 compliance. The MF-LS190 is available in bulk packaging, whereas the MF-LS190S was supplied with user-defined packaging. This distinction does not affect functional equivalence or circuit performance.

Frequently Asked Questions (FAQ)

Q: Can the MF-LS190 directly replace the MF-LS190S in existing designs?

A: Yes. The MF-LS190 is electrically and mechanically equivalent to the MF-LS190S. All critical parameters—voltage rating, hold current, trip current, resistance characteristics, and operating temperature range—are identical. The components are interchangeable at the circuit level.

Q: What is the difference between MF-LS190S and MF-LS190?

A: The primary difference is product status and packaging configuration. The MF-LS190S is obsolete with user-defined packaging, while the MF-LS190 is an active product supplied in bulk packaging. Electrical and mechanical specifications are identical.

Q: Are both parts certified to the same standards?

A: Yes. Both the MF-LS190S and MF-LS190 carry cURus and TUV approvals and are ROHS3 compliant. They meet identical regulatory and compliance requirements.

Q: What are the key electrical parameters that define substitutability for this component?

A: Substitutability is determined by: 24V maximum voltage rating, 1.9A hold current, 4.2A trip current, 3-second trip time, 30 mOhms minimum initial resistance, and 100 mOhms maximum post-trip resistance. All parameters must match for functional equivalence.

Q: Is the strap package configuration the same for both parts?

A: Yes. Both components use identical strap package configuration with dimensions of 0.880" L x 0.417" W (22.35mm x 10.60mm) and maximum thickness of 0.043" (1.10mm). Physical form factor is identical.