MF-PSML300/6-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-PSML300/6-2 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® series. This surface mount component operates at 6V maximum voltage with a 3A hold current rating and is housed in a 0805 (2012 Metric) package. The device is actively produced and maintains full RoHS3 compliance with cURus and TUV approvals. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for this product category.

Key Parameters

Parameter	Value
Manufacturer Part Number	MF-PSML300/6-2
Manufacturer	Bourns Inc.
Series	Multifuse®, MF-PSML/X
Type	Polymeric
Voltage - Max	6V
Current - Hold (Ih) (Max)	3 A
Current - Trip (It)	6 A
Current - Max	50 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	3 mOhms
Resistance - Post Trip (R1) (Max)	20 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	0805 (2012 Metric), Concave
Size / Dimension	0.085" L x 0.053" W (2.15mm x 1.35mm)
Thickness (Max)	0.055" (1.40mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)
REACH Status	REACH Unaffected
Product Status	Active

Substitute Part Grouping Explanation

The MF-PSML300/12-2 qualifies as a substitute based on the following allowed parameter alignment:

Matching parameters across both parts:

Identical series designation (Multifuse®, MF-PSML/X)
Identical polymeric type
Identical current hold rating (Ih): 3 A
Identical current trip rating (It): 6 A
Identical maximum current rating: 50 A
Identical time to trip: 5 s
Identical initial resistance (Ri): 3 mOhms minimum
Identical post-trip resistance (R1): 20 mOhms maximum
Identical operating temperature range: -40°C ~ 85°C
Identical mounting type: Surface Mount
Identical package: 0805 (2012 Metric), Concave
Identical physical dimensions and thickness
Identical RoHS3 compliance status
Identical MSL rating: 2A (4 Weeks)
Identical REACH status: REACH Unaffected

Differing parameter:

Voltage - Max: 6V (main part) versus 12V (substitute part)

The substitute part operates at a higher maximum voltage rating while maintaining all other electrical and mechanical specifications. This allows the MF-PSML300/12-2 to function in applications where the MF-PSML300/6-2 is specified, provided the circuit voltage does not exceed 6V.

Parameter Comparison

Parameter	MF-PSML300/6-2	MF-PSML300/12-2
Manufacturer	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-PSML/X	Multifuse®, MF-PSML/X
Type	Polymeric	Polymeric
Voltage - Max	6V	12V
Current - Hold (Ih) (Max)	3 A	3 A
Current - Trip (It)	6 A	6 A
Current - Max	50 A	50 A
Time to Trip	5 s	5 s
Resistance - Initial (Ri) (Min)	3 mOhms	3 mOhms
Resistance - Post Trip (R1) (Max)	20 mOhms	20 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	0805 (2012 Metric), Concave	0805 (2012 Metric), Concave
Size / Dimension	0.085" L x 0.053" W (2.15mm x 1.35mm)	0.085" L x 0.053" W (2.15mm x 1.35mm)
Thickness (Max)	0.055" (1.40mm)	0.055" (1.40mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active
Approval Agency	cURus, TUV	cUL, cURus, TUV

Engineering Selection Recommendations

Both the MF-PSML300/6-2 and MF-PSML300/12-2 maintain active product status with full regulatory compliance. The MF-PSML300/12-2 carries additional cUL approval beyond the cURus and TUV certifications present on the main part. Both components satisfy RoHS3 compliance requirements and REACH unaffected status, making them suitable for regulated applications.

Selection between these parts depends on circuit voltage requirements. The MF-PSML300/6-2 is specified for applications with maximum circuit voltages of 6V. The MF-PSML300/12-2 accommodates higher voltage circuits up to 12V while maintaining identical hold current, trip current, and thermal characteristics. When circuit voltage does not exceed 6V, either part may be selected based on availability and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the MF-PSML300/12-2 replace the MF-PSML300/6-2 in a 6V circuit?

A: Yes. The MF-PSML300/12-2 is rated for 12V maximum voltage and will function in circuits operating at 6V or below. All current ratings, thermal characteristics, and mechanical specifications are identical between the two parts.

Q: What is the primary difference between these two parts?

A: The maximum voltage rating differs. The MF-PSML300/6-2 is rated for 6V maximum, while the MF-PSML300/12-2 is rated for 12V maximum. All other electrical and mechanical parameters are identical.

Q: Are both parts available in the same package?

A: Yes. Both parts use the 0805 (2012 Metric) surface mount package with concave configuration. Physical dimensions and thickness specifications are identical, ensuring direct PCB footprint compatibility.

Q: Do both parts have the same regulatory approvals?

A: Both parts carry cURus and TUV approvals. The MF-PSML300/12-2 additionally carries cUL approval. Both are RoHS3 compliant and REACH unaffected.

Q: What is the hold current rating for both parts?

A: Both parts have a maximum hold current (Ih) of 3A with a trip current (It) of 6A.

Q: Are there any thermal or operating temperature differences?

A: No. Both parts operate across the identical temperature range of -40°C to 85°C.

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