MF-USML350-2 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-USML350-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc., rated for 6V at 4.6A hold current in a 1210 (3225 Metric) surface mount package. This component is classified as Obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part is ROHS3 compliant and carries cURus and TUV approvals.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	4.6 A
Current - Trip (It)	7 A
Current - Max	50 A
Mounting Type	Surface Mount
Package / Case	1210 (3225 Metric), Concave
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitution eligibility for the MF-USML350-2 is determined by the following critical parameters:

Voltage rating must equal or exceed 6V maximum
Current hold (Ih) rating must equal 4.6A
Current trip (It) rating must equal 7A
Mounting type must be Surface Mount
Package must be 1210 (3225 Metric), Concave
Operating temperature range must encompass -40°C to 85°C
RoHS3 compliance and cURus/TUV approvals must be maintained

The MF-USML350/6-2 meets all substitution criteria as an active product from the same manufacturer series (Multifuse® MF-USML/X), offering identical electrical ratings and package specifications with improved product status.

Parameter Comparison

Parameter	MF-USML350-2	MF-USML350/6-2
Manufacturer	Bourns Inc.	Bourns Inc.
Type	Polymeric	Polymeric
Voltage - Max	6V	6V
Current - Hold (Ih) (Max)	4.6 A	4.6 A
Current - Trip (It)	7 A	7 A
Current - Max	50 A	50 A
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MF-USML350/6-2 is the direct equivalent for the obsolete MF-USML350-2. Both parts maintain identical electrical specifications, package geometry, and regulatory compliance. The MF-USML350/6-2 carries Active product status, ensuring continued availability and manufacturing support. Selection of the MF-USML350/6-2 is appropriate for new designs and production transitions from the obsolete part number.

Frequently Asked Questions (FAQ)

Q: Can MF-USML350/6-2 be used as a direct replacement for MF-USML350-2?

A: Yes. Both parts share identical voltage ratings (6V), current hold ratings (4.6A), current trip ratings (7A), package specifications (1210 Concave), and regulatory approvals (cURus, TUV, ROHS3). The MF-USML350/6-2 is the active equivalent.

Q: What are the differences between MF-USML350-2 and MF-USML350/6-2?

A: The primary differences are product status (Obsolete vs. Active), time to trip (2s vs. 5s), initial resistance (3 mOhms vs. 2 mOhms), post-trip resistance (18 mOhms vs. 22 mOhms), thickness (0.024" vs. 0.047"), and packaging format (unspecified vs. Tape & Reel). Electrical performance and package footprint remain equivalent.

Q: Are there packaging considerations when substituting these parts?

A: The MF-USML350/6-2 is supplied in Tape & Reel format, whereas the MF-USML350-2 packaging is unspecified. Both maintain identical 1210 (3225 Metric) Concave package geometry suitable for surface mount assembly.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both parts are ROHS3 compliant, carry cURus and TUV approvals, and maintain identical operating temperature ranges (-40°C to 85°C). Regulatory compliance is equivalent.

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