LTP180 Equivalent & Substitute Parts

Part Overview

The LTP180 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 24V with a 1.8A hold current. This component is designed for circuit protection applications requiring automatic reset capability after fault conditions. The LTP180 operates within a temperature range of -40°C to 85°C and features a strap mounting configuration.

The LTP180 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

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
Package / Case	Strap
Size / Dimension	0.984" L x 0.199" W (25.00mm x 5.05mm)
Thickness (Max)	0.039" (1.00mm)
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the LTP180 is determined by strict equivalence across the following critical parameters:

Voltage rating (24V maximum), hold current (1.8A maximum), trip current (3.8A), maximum current capacity (100A), time to trip (2.9s), initial resistance (40 mOhms minimum), post-trip resistance (120 mOhms maximum), operating temperature range (-40°C to 85°C), polymeric type classification, and strap package configuration with matching physical dimensions (25.00mm x 5.05mm x 1.00mm maximum thickness).

The MF-LS180 manufactured by Bourns Inc. meets all specified electrical and mechanical parameters, establishing it as a direct functional equivalent to the LTP180.

Parameter Comparison

Parameter	LTP180 (Littelfuse)	MF-LS180 (Bourns)
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)
Type	Polymeric	Polymeric
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	1 (Unlimited)
Approval Agency	CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

The MF-LS180 is the qualified substitute for the obsolete LTP180. Both components satisfy identical electrical and mechanical specifications across all critical protection parameters.

The MF-LS180 offers additional advantages in terms of product lifecycle status: it maintains active manufacturing status, ensuring long-term availability. The MF-LS180 achieves ROHS3 compliance, whereas the LTP180 is non-compliant. The MF-LS180 carries a lower moisture sensitivity level (MSL 1 with unlimited shelf life) compared to the LTP180 (MSL 2A with 4-week limitation), providing improved storage and handling flexibility.

Both components carry TUV certification. The LTP180 includes CSA and UL approvals; the MF-LS180 carries cURus certification. Selection between these certifications depends on the specific regulatory requirements of the end application.

Frequently Asked Questions (FAQ)

Q: Can the MF-LS180 directly replace the LTP180 in existing designs?

A: Yes. The MF-LS180 matches all electrical parameters (voltage, hold current, trip current, time to trip, resistance values) and mechanical specifications (strap package, physical dimensions, thickness) of the LTP180. Direct substitution is electrically and mechanically compatible.

Q: What are the key differences between these two parts?

A: The primary differences are product status, compliance certifications, and storage characteristics. The LTP180 is obsolete; the MF-LS180 is active. The MF-LS180 is ROHS3 compliant while the LTP180 is not. The MF-LS180 has superior moisture sensitivity characteristics (MSL 1 unlimited versus MSL 2A 4-week limit). Certification bodies differ slightly: LTP180 includes UL and CSA; MF-LS180 includes cURus. Both carry TUV certification.

Q: Are there any compatibility concerns with the strap package configuration?

A: No. Both components use identical strap mounting configuration with matching physical dimensions (25.00mm x 5.05mm x 1.00mm maximum thickness). Mechanical fit and electrical connection points are equivalent.

Q: Which certifications apply to my application?

A: Certification requirements depend on your end-use application and regional standards. The LTP180 carries CSA, TUV, and UL approvals. The MF-LS180 carries cURus and TUV approvals. Verify that the substitute part's certification portfolio meets your specific application requirements.

Q: Is the MF-LS180 available in the same packaging format?

A: The MF-LS180 is supplied in bulk packaging, whereas the LTP180 packaging format is listed as user-defined. Both components are available in strap configuration with identical physical specifications. Confirm packaging and quantity requirements with your supplier.

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