MICROSMD200F-2 Polymeric PTC Resettable Fuse 6V 2A 1210

Part Overview

The MICROSMD200F-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of the PolySwitch® microSMD series. This component provides overcurrent protection in surface mount applications with a 6V maximum voltage rating and 2A hold current. The part is active and widely stocked with 18,271 units available. Substitute parts are necessary when design requirements include different package sizes, lower current ratings, or alternative thermal characteristics while maintaining the same voltage protection level and polymeric PTC technology.

Key Parameters

Parameter	Value
Manufacturer Part Number	MICROSMD200F-2
Manufacturer	Littelfuse Inc.
Series	PolySwitch® microSMD
Type	Polymeric
Voltage - Max	6V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	4 A
Resistance - Initial (Ri) (Min)	20 mOhms
Resistance - Post Trip (R1) (Max)	60 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	1210 (3225 Metric), Concave
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the MICROSMD200F-2 is determined by the following criteria:

Voltage Compatibility: All substitute parts must maintain the same 6V maximum voltage rating to ensure equivalent protection levels. The 1206L150THWR operates at 8V and is not a direct substitute.

Package Size Consideration: The main part uses 1210 (3225 Metric) packaging. Substitutes are grouped by package size: 0805 (2012 Metric), 1206 (3216 Metric), and 1210 (3225 Metric). Package selection depends on PCB layout constraints and thermal dissipation requirements.

Current Rating: Hold current (Ih) determines the normal operating threshold. Substitutes range from 350 mA to 2 A. Selection depends on circuit protection requirements. Lower current ratings provide more sensitive protection; higher ratings allow greater continuous current.

Thermal Characteristics: Time to trip and resistance values affect response speed and heat generation. These parameters vary across the substitute list and must align with application requirements.

Compliance and Certifications: All listed substitutes maintain ROHS3 compliance and are manufactured by Littelfuse Inc. Approval agencies include cURus and TUV certifications.

Parameter Comparison

Part Number	Package	Voltage (Max)	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Time to Trip	Series
MICROSMD200F-2	1210 (3225 Metric)	6V	2 A	4 A	20 mOhms	60 mOhms	2.5 s	PolySwitch® microSMD
0805L035YR	0805 (2012 Metric)	6V	350 mA	750 mA	250 mOhms	1.2 Ohms	100 ms	POLY-FUSE® 0805L
0805L050WR	0805 (2012 Metric)	6V	500 mA	1 A	150 mOhms	850 mOhms	100 ms	POLY-FUSE® 0805L
1206L035YR	1206 (3216 Metric)	6V	350 mA	750 mA	300 mOhms	1.2 Ohms	100 ms	POLY-FUSE® 1206L
1206L050YR	1206 (3216 Metric)	6V	500 mA	1 A	150 mOhms	700 mOhms	100 ms	POLY-FUSE® 1206L
1206L150THWR	1206 (3216 Metric)	8V	1.5 A	3 A	40 mOhms	120 mOhms	300 ms	POLY-FUSE® 1206L
1206L200PR	1206 (3216 Metric)	6V	2 A	4.6 A	18 mOhms	80 mOhms	1.5 s	POLY-FUSE® 1206L
1210L035YR	1210 (3225 Metric)	6V	350 mA	700 mA	320 mOhms	1.3 Ohms	200 ms	POLY-FUSE® 1210L
1210L075YR	1210 (3225 Metric)	6V	750 mA	1.5 A	130 mOhms	400 mOhms	100 ms	POLY-FUSE® 1210L
1210L150THWR	1210 (3225 Metric)	6V	1.5 A	3 A	40 mOhms	110 mOhms	300 ms	POLY-FUSE® 1210L
1210L175WR	1210 (3225 Metric)	6V	1.75 A	4.6 A	20 mOhms	80 mOhms	600 ms	POLY-FUSE® 1210L

Engineering Selection Recommendations

Same Package Substitutes (1210 Metric): The 1210L150THWR, 1210L175WR, and 1210L035YR maintain the same 1210 (3225 Metric) package footprint as the MICROSMD200F-2. These are suitable for direct PCB layout compatibility. The 1210L200PR in 1206 package offers equivalent 2A hold current but requires PCB layout modification.

Voltage Constraint: The 1206L150THWR operates at 8V maximum and is not suitable for 6V-only applications. All other substitutes maintain 6V compatibility.

Current Rating Selection: For applications requiring 2A hold current protection identical to MICROSMD200F-2, the 1206L200PR provides equivalent performance in a smaller 1206 package. For reduced current protection, 1210L150THWR (1.5A), 1210L175WR (1.75A), or 1210L075YR (750 mA) are available in the same package.

Product Status and Compliance: All substitute parts are active products with ROHS3 compliance and cURus/TUV certifications, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can I substitute MICROSMD200F-2 with a smaller package like 0805?

A: Yes, if PCB layout permits. The 0805L035YR and 0805L050WR provide smaller footprints but with lower current ratings (350 mA and 500 mA respectively). Verify that the reduced hold current meets circuit protection requirements.

Q: What is the difference between hold current (Ih) and trip current (It)?

A: Hold current (Ih) is the maximum continuous current the fuse allows without tripping. Trip current (It) is the threshold at which the fuse activates protection. The MICROSMD200F-2 holds 2A continuously and trips at 4A.

Q: Is 1206L150THWR a direct substitute?

A: No. While it shares similar form factor considerations, it operates at 8V maximum versus the 6V rating of MICROSMD200F-2. Use only for applications requiring 8V protection.

Q: How do resistance values affect component selection?

A: Initial resistance (Ri) and post-trip resistance (R1) determine voltage drop and heat generation. Lower initial resistance reduces normal operating losses. Post-trip resistance affects the fuse's ability to limit fault current. Select based on circuit thermal and voltage drop tolerances.

Q: Can I use 1206L200PR as a direct replacement?

A: Functionally yes for 2A protection at 6V, but it requires PCB layout modification due to different package size (1206 versus 1210). Verify mechanical fit and thermal dissipation path before substitution.

Q: What does MSL rating mean?

A: Moisture Sensitivity Level (MSL) indicates storage and handling requirements. MICROSMD200F-2 has MSL 2A (4 weeks), while most substitutes have MSL 1 (unlimited). Lower MSL numbers allow longer shelf life without special storage conditions.

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