MICROSMD075F-2 Equivalent & Substitute Parts

Part Overview

The MICROSMD075F-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 6V maximum voltage with 750 mA hold current. This component is designed for overcurrent protection in surface mount applications and is currently in active production status. Substitute parts are identified to provide design flexibility, alternative sourcing options, and compatibility with varying application requirements while maintaining equivalent electrical and mechanical performance within specified parameters.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Package / Case	1210 (3225 Metric), Concave
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Type	Polymeric

Substitute Part Grouping Explanation

Substitute parts for the MICROSMD075F-2 are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical & Package Equivalents Parts that maintain identical voltage rating (6V), hold current (750 mA), trip current (1.5 A), and package form factor (1210 / 3225 Metric). These parts are interchangeable in applications where the primary protection parameters are the controlling design criteria. This category includes 1210L075YR (Littelfuse) and MF-USMF075-2 (Bourns).

Category 2: Reduced Current Rating Alternatives Parts that maintain the same voltage rating (6V) and package footprint (0402 / 1005 Metric) but with lower hold current ratings (100 mA or 200 mA). These parts are suitable for applications requiring lower current protection thresholds. This category includes 0402L010SLKR (100 mA) and 0402L020SLKR (200 mA).

Substitution eligibility is determined by matching: maximum voltage, hold current rating, trip current, package dimensions, and surface mount compatibility.

Parameter Comparison

Parameter	MICROSMD075F-2	1210L075YR	MF-USMF075-2	0402L010SLKR	0402L020SLKR
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Littelfuse Inc.	Littelfuse Inc.
Voltage - Max	6V	6V	6V	6V	6V
Current - Hold (Ih) (Max)	750 mA	750 mA	750 mA	100 mA	200 mA
Current - Trip (It)	1.5 A	1.5 A	1.5 A	300 mA	500 mA
Package / Case	1210 (3225 Metric)	1210 (3225 Metric)	1210 (3225 Metric)	0402 (1005 Metric)	0402 (1005 Metric)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Resistance - Initial (Ri) (Min)	110 mOhms	130 mOhms	70 mOhms	150 mOhms	100 mOhms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric

Engineering Selection Recommendations

For Direct Substitution (1210L075YR, MF-USMF075-2): Both parts maintain identical electrical specifications (6V, 750 mA hold current, 1.5 A trip current) and package form factor. Selection between these options is based on manufacturer preference, supply chain availability, and compliance certifications. The 1210L075YR carries CSA and UL approvals, while MF-USMF075-2 includes AEC-Q200 automotive qualification. Both are ROHS3 compliant and suitable for equivalent circuit protection applications.

For Reduced Current Applications (0402L010SLKR, 0402L020SLKR): These parts are applicable only when circuit design requires lower hold current thresholds (100 mA or 200 mA respectively). The 0402 package footprint is significantly smaller than the 1210 package, requiring PCB layout modification. Both parts maintain 6V voltage rating and ROHS3 compliance. Selection depends on specific current protection requirements and available board space.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity levels vary: MICROSMD075F-2 is rated 2A (4 weeks), while direct substitutes 1210L075YR and MF-USMF075-2 are rated 1 (Unlimited). The 0402 series parts are also rated 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can 1210L075YR be used as a direct replacement for MICROSMD075F-2? A: Yes. Both parts share identical electrical ratings (6V, 750 mA hold current, 1.5 A trip current) and 1210 package dimensions. The parts are electrically and mechanically interchangeable.

Q: What is the difference between MICROSMD075F-2 and MF-USMF075-2? A: Both parts have identical voltage (6V), hold current (750 mA), and trip current (1.5 A) specifications. The primary differences are manufacturer (Littelfuse vs. Bourns), initial resistance (110 mOhms vs. 70 mOhms), and certifications (MF-USMF075-2 includes AEC-Q200 automotive qualification).

Q: Can 0402L010SLKR or 0402L020SLKR replace MICROSMD075F-2? A: These parts are not direct replacements. While they maintain the 6V voltage rating, they have significantly lower hold current ratings (100 mA and 200 mA respectively, compared to 750 mA). Additionally, the 0402 package is substantially smaller than the 1210 package, requiring PCB redesign. Use these parts only when circuit requirements specify lower current protection thresholds.

Q: What are the package dimension differences between 1210 and 0402? A: The 1210 package measures 0.127" L x 0.102" W (3.22mm x 2.58mm) with 0.024" maximum thickness. The 0402 package measures 0.039" L x 0.020" W (1.00mm x 0.50mm) with 0.024" maximum thickness. The 1210 package is approximately 3.2 times larger in length and 5.1 times larger in width.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (1210L075YR, MF-USMF075-2, 0402L010SLKR, 0402L020SLKR) are ROHS3 compliant and REACH unaffected.

Q: What is the significance of moisture sensitivity level differences? A: MICROSMD075F-2 is rated MSL 2A (4 weeks), while direct substitutes are rated MSL 1 (Unlimited). MSL 1 rating provides extended shelf life and reduced moisture absorption risk, offering greater handling flexibility in manufacturing environments.

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