MF-USML600-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-USML600-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc., designed for surface mount applications in the 1210 (3225 Metric) package. This component provides overcurrent protection with a 6V maximum voltage rating and 6A hold current specification. The MF-USML600-2 is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing design support and component procurement.

Substiute Parts

MF-USML600-2

Bourns Inc.In Stock: 781MF-USML600-2 Datasheet

Current PartRFQ

MF-USML600/6-2

Bourns Inc.In Stock: 4283MF-USML600/6-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-USML600-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 6V maximum
• Current hold specification: 6A
• Current trip specification: 12A
• Package form factor: 1210 (3225 Metric), Concave
• Mounting technology: Surface Mount
• Material type: Polymeric PTC
• Regulatory compliance: cURus and TUV approval

The MF-USML600/6-2 meets all these criteria and is identified as a direct substitute. Differences in post-trip resistance (R1) and thickness do not affect functional substitution when the primary electrical parameters remain within specification.

Parameter Comparison

Engineering Selection Recommendations

The MF-USML600/6-2 is the appropriate substitute for the obsolete MF-USML600-2. Both components are manufactured by Bourns Inc. and carry identical electrical specifications across all critical parameters: voltage, current hold, current trip, and time to trip. Both maintain ROHS3 compliance and carry cURus and TUV approvals, ensuring regulatory equivalence.

The MF-USML600/6-2 is currently in active production status with higher inventory availability, making it the preferred selection for new designs and component replenishment. The packaging format difference (Tape & Reel versus bulk) and minor variations in post-trip resistance and thickness do not affect electrical performance in applications designed for the MF-USML600-2 specification.

Frequently Asked Questions (FAQ)

Q: Can the MF-USML600/6-2 be used as a direct replacement for the MF-USML600-2?

A: Yes. Both components share identical voltage, current hold, current trip, and time to trip specifications. The electrical performance is equivalent, and both carry the same regulatory approvals (cURus, TUV) and ROHS3 compliance status.

Q: What is the difference between the packaging formats?

A: The MF-USML600-2 is supplied in bulk packaging, while the MF-USML600/6-2 is supplied in Tape & Reel (TR) format. This difference affects handling and assembly processes but does not impact component functionality or electrical characteristics.

Q: Are there differences in post-trip resistance between these parts?

A: The MF-USML600-2 specifies a maximum post-trip resistance (R1) of 14 mOhms, while the MF-USML600/6-2 specifies 10 mOhms. Both values are within acceptable operating ranges for polymeric PTC resettable fuses and do not affect substitution compatibility.

Q: Does the thickness difference affect PCB layout?

A: The MF-USML600-2 has a maximum thickness of 0.047" (1.20mm), while the MF-USML600/6-2 has a maximum thickness of 0.039" (1.00mm). Both components use the same 1210 (3225 Metric) package footprint. The thickness difference is minor and does not require PCB layout modifications.

Q: Why is the MF-USML600-2 listed as obsolete?

A: The MF-USML600-2 has been superseded by the MF-USML600/6-2 in Bourns Inc.'s product line. The newer variant maintains full electrical equivalence while offering improved availability and active manufacturing support.