MF-USML190-2 Equivalent & Substitute Parts

Part Overview

The MF-USML190-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V maximum voltage with a 1.9A hold current. This component is classified as Obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement planning. The part is housed in a 1210 (3225 Metric) surface mount package with concave geometry and carries cURus and TUV approval certifications.

Substiute Parts

MF-USML190-2

Bourns Inc.In Stock: 1092MF-USML190-2 Datasheet

Current PartRFQ

MF-USML200/6-2

Bourns Inc.In Stock: 1108MF-USML200/6-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The MF-USML200/6-2 qualifies as a direct substitute based on the following critical parameters:

Matching Parameters:

• Voltage rating: 6V (identical)
• Package / Case: 1210 (3225 Metric), Concave (identical)
• Mounting Type: Surface Mount (identical)
• Operating Temperature: -40°C ~ 85°C (identical)
• Approval Agency: cURus, TUV (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level: 2A (4 Weeks) (identical)

Allowable Variations:

• Current - Hold (Ih): 1.9A → 2A (within acceptable tolerance for PTC fuse operation)
• Current - Trip (It): 4.9A → 4A (within acceptable tolerance)
• Time to Trip: 3s → 5s (acceptable variation for resettable fuse response)
• Resistance - Initial (Ri): 6 mOhms → 5 mOhms (negligible difference)
• Resistance - Post Trip (R1): 30 mOhms → 40 mOhms (acceptable variation)
• Thickness: 0.024" (0.60mm) → 0.031" (0.80mm) (within board assembly tolerances)
• Product Status: Obsolete → Active (substitute is in active production)

Parameter Comparison

Engineering Selection Recommendations

The MF-USML200/6-2 is the qualified substitute for the obsolete MF-USML190-2. Both components carry identical regulatory certifications (cURus, TUV) and comply with ROHS3 requirements. The substitute maintains the same voltage rating, package geometry, and operating temperature range, ensuring mechanical and electrical compatibility in existing designs.

The MF-USML200/6-2 is in active production status, providing supply chain continuity and long-term availability compared to the obsolete MF-USML190-2. The minor variations in hold current, trip current, and post-trip resistance fall within acceptable operational tolerances for polymeric PTC resettable fuse applications.

Frequently Asked Questions (FAQ)

Q: Can MF-USML200/6-2 be used as a direct replacement for MF-USML190-2 in existing designs?

A: Yes. Both parts share identical voltage ratings (6V), package specifications (1210 Concave), mounting type (Surface Mount), and regulatory certifications. The hold current difference (1.9A vs. 2A) and trip current difference (4.9A vs. 4A) are within acceptable operational ranges for polymeric PTC fuse substitution.

Q: What is the primary reason for substitution?

A: The MF-USML190-2 is classified as Obsolete. The MF-USML200/6-2 is an Active product from the same manufacturer and series, ensuring continued availability and supply chain support.

Q: Are there any package or footprint differences?

A: Both parts use the 1210 (3225 Metric) Concave package. Dimensional differences are minimal: the substitute has a maximum thickness of 0.031" (0.80mm) compared to 0.024" (0.60mm) for the original part. This variation is within standard PCB assembly tolerances.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both the MF-USML190-2 and MF-USML200/6-2 carry cURus and TUV certifications and are ROHS3 Compliant.

Q: What is the difference in trip response time?

A: The MF-USML190-2 has a 3-second trip time, while the MF-USML200/6-2 has a 5-second trip time. This difference reflects the slightly higher hold current rating of the substitute and remains within acceptable limits for overcurrent protection applications.