LTP180F Equivalent & Substitute Parts

Part Overview

The LTP180F is a polymeric PTC resettable fuse manufactured by Littelfuse, rated for 24V with a 1.8A hold current. This component is designed to provide overcurrent protection in electronic circuits through automatic reset functionality. The LTP180F operates within a temperature range of -40°C to 85°C and features a strap mounting configuration.

The LTP180F 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 LTP180F is determined by strict equivalence across the following critical parameters:

Voltage rating: 24V maximum
Current hold rating: 1.8A maximum
Current trip rating: 3.8A
Time to trip: 2.9 seconds
Initial resistance: 40 mOhms minimum
Post-trip resistance: 120 mOhms maximum
Operating temperature range: -40°C to 85°C
Package type: Strap configuration
Physical dimensions: 25.00mm L x 5.05mm W x 1.00mm thickness maximum
Component type: Polymeric PTC resettable fuse

The MF-LS180 manufactured by Bourns Inc. meets all specified electrical and mechanical parameters, making it a direct functional equivalent for the obsolete LTP180F.

Parameter Comparison

Parameter	LTP180F (Littelfuse)	MF-LS180 (Bourns Inc.)
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8533.40.8070	8533.40.8070

Engineering Selection Recommendations

The MF-LS180 is the direct equivalent substitute for the obsolete LTP180F. Both components are polymeric PTC resettable fuses with identical electrical specifications and physical dimensions.

The MF-LS180 carries an active product status, ensuring ongoing availability and supply chain support. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component use.

The MF-LS180 holds cURus and TUV approvals, while the LTP180F holds CSA, TUV, and UL approvals. Both components satisfy standard industrial certification requirements for overcurrent protection devices.

The MF-LS180 features a moisture sensitivity level (MSL) of 1 (Unlimited), providing superior moisture handling compared to the LTP180F's MSL of 2A (4 Weeks). This represents an improvement in storage and handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can the MF-LS180 directly replace the LTP180F in existing designs?

A: Yes. The MF-LS180 meets all electrical and mechanical specifications of the LTP180F, including voltage rating, current ratings, response time, resistance characteristics, operating temperature range, and physical dimensions. Direct substitution is supported without circuit modification.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by matching voltage rating (24V), hold current (1.8A), trip current (3.8A), time to trip (2.9s), initial resistance (40 mOhms minimum), post-trip resistance (120 mOhms maximum), operating temperature range (-40°C to 85°C), package type (strap), and physical dimensions (25.00mm x 5.05mm x 1.00mm maximum).

Q: Are there differences in approval certifications between these components?

A: The LTP180F holds CSA, TUV, and UL approvals. The MF-LS180 holds cURus and TUV approvals. Both components satisfy standard industrial certification requirements. Verify that the specific certifications required by your application are present in the selected component.

Q: What is the difference in moisture sensitivity levels?

A: The LTP180F has an MSL of 2A (4 Weeks), while the MF-LS180 has an MSL of 1 (Unlimited). The MF-LS180 offers superior moisture handling characteristics and reduced storage constraints.

Q: Is the MF-LS180 currently available?

A: Yes. The MF-LS180 carries an active product status with documented inventory availability, ensuring reliable supply chain access for new designs and production requirements.

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