SMD200F-2018-2 Equivalent & Substitute Parts

Part Overview

The SMD200F-2018-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® SMD series. This component is rated for 6V maximum voltage with a 2A hold current and is designed for surface mount applications in the 2-SMD package configuration. The part is currently active in production with ROHS3 compliance and carries CSA, TUV, and UL approvals.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified voltage, current, and thermal operating parameters while accommodating different package form factors or manufacturer alternatives.

Key Parameters

Parameter	SMD200F-2018-2
Voltage - Max	6V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	4.2 A
Current - Max	40 A
Time to Trip	3 s
Resistance - Initial (Ri) (Min)	48 mOhms
Resistance - Post Trip (R1) (Max)	100 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD
Size / Dimension	0.200" L x 0.180" W (5.08mm x 4.58mm)
Thickness (Max)	0.060" (1.52mm)
RoHS Status	ROHS3 Compliant
Approval Agency	CSA, TUV, UL

Substitute Part Grouping Explanation

Substitution eligibility for the SMD200F-2018-2 is determined by the following criteria:

Primary Electrical Compatibility Requirements:

Voltage rating must equal or exceed 6V maximum
Current hold (Ih) rating must support 2A operation
Operating temperature range must encompass -40°C to 85°C
Polymeric PTC resettable fuse type

Secondary Considerations:

Package form factor differences are acceptable when mechanical constraints permit
Manufacturer alternatives are valid when all electrical parameters align
Resistance characteristics (initial and post-trip) may vary within acceptable operational margins
Approval certifications must maintain compliance standards

The identified substitutes fall into two categories: direct form-factor alternatives from Littelfuse Inc. and functionally equivalent parts from Bourns Inc. with different package geometries. All substitutes maintain the 6V voltage rating and support the required current hold specification, though some offer different current-trip characteristics suited to specific application requirements.

Parameter Comparison

Parameter	SMD200F-2018-2	2016L200PR	MF-USMF110-2	MF-PSMF075X-2	MF-USMF035-2	MF-PSMF050X-2	MF-PSMF035X-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.
Voltage - Max	6V	6V	6V	6V	6V	6V	6V
Current - Hold (Ih) (Max)	2 A	2 A	1.1 A	750 mA	350 mA	500 mA	350 mA
Current - Trip (It)	4.2 A	4.2 A	2.2 A	1.5 A	750 mA	1 A	750 mA
Current - Max	40 A	40 A	40 A	40 A	40 A	40 A	40 A
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD	2016 (5041 Metric), Concave	1210 (3225 Metric), Concave	0805 (2012 Metric), Concave	1210 (3225 Metric), Concave	0805 (2012 Metric), Concave	0805 (2012 Metric), Concave
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV

Engineering Selection Recommendations

Direct Littelfuse Substitute: The 2016L200PR maintains identical electrical specifications (6V, 2A hold current, 4.2A trip current) and is the closest functional equivalent. This part differs only in package geometry (2016 vs. 2-SMD) and offers improved availability (18,988 units in stock vs. 7,980 units). Approval certifications include cURus and TUV with ROHS3 compliance maintained.

Bourns Multifuse® Alternatives: The MF-USMF110-2 provides the closest current-hold rating (1.1A) among Bourns alternatives and maintains 6V voltage compatibility. This part carries AEC-Q200 automotive qualification and is suitable for applications requiring automotive-grade reliability. The 1210 package offers a larger footprint than the original 2-SMD configuration.

For applications with lower current requirements, the MF-PSMF series (0805 package) and MF-USMF035-2 (1210 package) provide scaled current ratings while maintaining 6V voltage operation. These alternatives are appropriate only when circuit design accommodates reduced hold-current specifications.

All substitute parts maintain ROHS3 compliance and operate across the -40°C to 85°C temperature range. Selection should be based on specific circuit current requirements and available PCB layout space for the respective package geometries.

Frequently Asked Questions (FAQ)

Q: Can the 2016L200PR directly replace the SMD200F-2018-2 in existing designs? A: The 2016L200PR is electrically equivalent with identical voltage (6V) and current ratings (2A hold, 4.2A trip). Package geometry differs (2016 vs. 2-SMD), requiring PCB layout verification. Both parts maintain ROHS3 compliance and operate across -40°C to 85°C.

Q: What is the difference between the Littelfuse and Bourns substitute options? A: The Littelfuse 2016L200PR maintains the exact electrical specification of the original part. Bourns Multifuse® alternatives offer different current ratings and package sizes. Selection depends on whether the application circuit can operate with reduced hold-current values (MF-USMF110-2 at 1.1A, or smaller ratings in the MF-PSMF series).

Q: Are the smaller Bourns packages (0805) suitable replacements? A: The MF-PSMF series in 0805 package provides significantly reduced current ratings (350mA to 750mA hold current). These are suitable only for circuits designed to operate at these lower current levels. PCB layout space is reduced compared to the original 2-SMD package.

Q: Do all substitutes maintain the same approval certifications? A: The original SMD200F-2018-2 carries CSA, TUV, and UL approvals. Littelfuse 2016L200PR carries cURus and TUV approvals. Bourns parts carry cURus and TUV approvals, with MF-USMF series additionally qualified to AEC-Q200. Application requirements determine if certification differences are acceptable.

Q: What is the impact of different resistance characteristics on circuit performance? A: Initial resistance (Ri) and post-trip resistance (R1) vary across substitutes. The SMD200F-2018-2 specifies 48mOhms minimum initial resistance and 100mOhms maximum post-trip resistance. Bourns alternatives show higher resistance values. Circuit designs sensitive to voltage drop across the fuse element require detailed analysis of these parameters.

Q: Can I use a lower current-rated substitute if my circuit only draws 1A? A: Substitutes with lower hold-current ratings (such as MF-USMF110-2 at 1.1A) are acceptable only if the circuit design is verified to operate within the reduced current specification. The hold current must exceed the maximum sustained circuit current under all operating conditions.

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