MF-USML600/6-2 Equivalent & Substitute Parts

Part Overview

The MF-USML600/6-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V at 6A hold current. This component is designed for overcurrent protection in surface mount applications and is currently in active production status. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and component availability options for applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	12 A
Current - Max	50 A
Resistance - Initial (Ri) (Min)	1 mOhms
Resistance - Post Trip (R1) (Max)	10 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	1210 (3225 Metric), Concave
Mounting Type	Surface Mount
Thickness (Max)	0.039" (1.00mm)
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the MF-USML600/6-2 are qualified based on the following critical parameters that determine functional equivalence:

Voltage rating of 6V maximum, Current hold (Ih) rating of 6A maximum, Current trip (It) rating of 12A, Package configuration of 1210 (3225 Metric) with concave profile, Surface mount mounting type, Operating temperature range of -40°C to 85°C, Resistance specifications within defined limits, and regulatory compliance certifications (cURus, TUV, ROHS3).

The PTSLR12106V600 from Eaton - Electronics Division meets all critical electrical and mechanical parameters required for direct substitution in the MF-USML600/6-2 application.

Parameter Comparison

Parameter	MF-USML600/6-2 (Bourns)	PTSLR12106V600 (Eaton)	Match Status
Voltage - Max	6V	6V	Equivalent
Current - Hold (Ih) (Max)	6 A	6 A	Equivalent
Current - Trip (It)	12 A	12 A	Equivalent
Current - Max	50 A	50 A	Equivalent
Resistance - Initial (Ri) (Min)	1 mOhms	1 mOhms	Equivalent
Resistance - Post Trip (R1) (Max)	10 mOhms	10 mOhms	Equivalent
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Equivalent
Package / Case	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Thickness (Max)	0.039" (1.00mm)	0.039" (1.00mm)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Approval Agency	cURus, TUV	cURus, TUV	Equivalent
Time to Trip	2 s	5 s	Variation

Engineering Selection Recommendations

Both the MF-USML600/6-2 and PTSLR12106V600 are active production components with identical regulatory compliance certifications (cURus, TUV) and ROHS3 compliance status. Both components are packaged in Tape & Reel format and maintain equivalent electrical performance across voltage, current, and resistance specifications.

The primary technical difference between these parts is the Time to Trip specification: the MF-USML600/6-2 has a 2-second trip time, while the PTSLR12106V600 has a 5-second trip time. This difference must be evaluated against application-specific overcurrent protection requirements. Selection between these parts should be based on the required response time for the target application and component availability from preferred suppliers.

Frequently Asked Questions (FAQ)

Q: Can PTSLR12106V600 be used as a direct replacement for MF-USML600/6-2?

A: The PTSLR12106V600 is electrically and mechanically equivalent to the MF-USML600/6-2 across all critical parameters including voltage rating, current hold and trip specifications, package configuration, and regulatory certifications. The difference in Time to Trip (5 seconds versus 2 seconds) must be evaluated for compatibility with application requirements.

Q: Are the package dimensions identical between these parts?

A: Both parts use the 1210 (3225 Metric) concave package with 0.039" (1.00mm) maximum thickness. Minor dimensional variations exist in length and width (MF-USML600/6-2: 0.127" L x 0.101" W versus PTSLR12106V600: 0.135" L x 0.110" W), which remain within standard 1210 package tolerances and do not affect PCB layout compatibility.

Q: What regulatory certifications apply to both parts?

A: Both the MF-USML600/6-2 and PTSLR12106V600 carry cURus and TUV approvals and are ROHS3 compliant. Both parts are classified as REACH Unaffected and carry EAR99 ECCN designation.

Q: What is the moisture sensitivity level for these components?

A: Both parts are rated at MSL 2A (4 Weeks), indicating standard moisture sensitivity handling requirements for surface mount components.

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