MF-LS180S Equivalent & Substitute Parts

Part Overview

The MF-LS180S is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 24V with a 1.8A hold current. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The MF-LS180S belongs to the Multifuse® MF-LS series and is designed for applications requiring automatic overcurrent protection with resettable functionality.

Key Parameters

Parameter	Value
Voltage - Max	24V
Current - Hold (Ih) (Max)	1.8 A
Current - Trip (It)	3.8 A
Current - Max	100 A
Time to Trip	2.9 s
Resistance - Initial (Ri) (Min)	40 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms
Operating Temperature	-40°C ~ 85°C
Type	Polymeric
Package / Case	Strap
Size / Dimension	0.984" L x 0.199" W (25.00mm x 5.05mm)
Thickness (Max)	0.039" (1.00mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

The MF-LS180 serves as a direct equivalent to the MF-LS180S. Substitution is valid based on identical electrical and mechanical parameters:

Voltage rating: 24V (identical)
Current - Hold (Ih): 1.8 A (identical)
Current - Trip (It): 3.8 A (identical)
Current - Max: 100 A (identical)
Time to Trip: 2.9 s (identical)
Resistance - Initial (Ri): 40 mOhms (identical)
Resistance - Post Trip (R1): 120 mOhms (identical)
Operating Temperature: -40°C ~ 85°C (identical)
Package / Case: Strap (identical)
Physical dimensions: 0.984" L x 0.199" W, 0.039" thickness (identical)
Approval certifications: cURus, TUV (identical)
RoHS compliance: ROHS3 Compliant (identical)

The primary distinction is product status: MF-LS180S is obsolete, while MF-LS180 is active. Packaging differs only in designation (MF-LS180S specifies user-defined packaging; MF-LS180 is supplied in bulk).

Parameter Comparison

Parameter	MF-LS180S (Main Part)	MF-LS180 (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-LS	Multifuse®, MF-LS
Product Status	Obsolete	Active
Type	Polymeric	Polymeric
Voltage - Max	24V	24V
Current - Hold (Ih) (Max)	1.8 A	1.8 A
Current - Trip (It)	3.8 A	3.8 A
Current - Max	100 A	100 A
Time to Trip	2.9 s	2.9 s
Resistance - Initial (Ri) (Min)	40 mOhms	40 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms	120 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	Strap	Strap
Size / Dimension	0.984" L x 0.199" W (25.00mm x 5.05mm)	0.984" L x 0.199" W (25.00mm x 5.05mm)
Thickness (Max)	0.039" (1.00mm)	0.039" (1.00mm)
Approval Agency	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Packaging Type	User Defined	Bulk
Inventory Status	757 Pcs New Original In Stock	4477 Pcs New Original In Stock

Engineering Selection Recommendations

The MF-LS180 is the direct active equivalent for the obsolete MF-LS180S. Both parts maintain identical electrical specifications, thermal operating range, and regulatory certifications (cURus, TUV). Both are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity).

Selection of MF-LS180 over MF-LS180S is driven by product lifecycle status: MF-LS180S is obsolete and should not be specified for new designs or long-term procurement. MF-LS180 is actively manufactured and supported, ensuring supply chain continuity and design longevity.

Packaging differences (user-defined versus bulk) do not affect electrical or mechanical compatibility. The bulk packaging of MF-LS180 is standard for active production inventory.

Frequently Asked Questions (FAQ)

Q: Can MF-LS180 directly replace MF-LS180S in existing designs?

A: Yes. All electrical parameters, thermal ratings, physical dimensions, and regulatory certifications are identical. Direct substitution is valid without circuit modification.

Q: What is the difference between MF-LS180S and MF-LS180?

A: The MF-LS180S is obsolete; MF-LS180 is the active equivalent. Electrical and mechanical specifications are identical. Packaging designation differs (user-defined versus bulk), but this does not affect component function or compatibility.

Q: Are both parts certified to the same standards?

A: Yes. Both MF-LS180S and MF-LS180 carry cURus and TUV approvals and are ROHS3 compliant.

Q: What is the operating temperature range for these parts?

A: Both parts operate across -40°C to 85°C.

Q: What is the hold current specification?

A: The hold current (Ih) is 1.8A maximum for both parts. The trip current (It) is 3.8A.

Q: Are there any moisture sensitivity concerns?

A: No. Both parts have MSL rating of 1 (unlimited), indicating no moisture sensitivity restrictions.

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