FEMTOSMDC010F-02 Equivalent & Substitute Parts

Part Overview

The FEMTOSMDC010F-02 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. as part of the PolySwitch® femtoSMD series. This component provides overcurrent protection in 12V circuits with a 100 mA hold current rating and surface mount 0603 (1608 Metric) packaging. The part is Active status and widely used in consumer electronics, industrial control, and telecommunications applications where automatic circuit protection and reset capability are required. Identifying equivalent and substitute parts is necessary for supply chain continuity, inventory management, and design flexibility across manufacturing environments.

Key Parameters

Parameter	Value
Voltage - Max	12V
Current - Hold (Ih) (Max)	100 mA
Current - Trip (It)	250 mA
Current - Max	40 A
Time to Trip	100 ms
Resistance - Initial (Ri) (Min)	1.7 Ohms
Resistance - Post Trip (R1) (Max)	8 Ohms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	0603 (1608 Metric), Concave
Type	Polymeric
Series	PolySwitch®, femtoSMD
RoHS Status	ROHS3 Compliant
Approval Agency	CSA, TUV, UL

Substitute Part Grouping Explanation

Substitute parts for the FEMTOSMDC010F-02 are determined by strict equivalence across the following critical parameters:

Voltage rating (12V maximum)
Current hold specification (100 mA Ih)
Current trip threshold (250 mA It)
Polymeric PTC resettable fuse type
Surface mount 0603 (1608 Metric) package with concave geometry
Operating temperature range (-40°C ~ 85°C)
Regulatory compliance (CSA, TUV, UL certifications)
RoHS3 compliance status

The FEMTOSMDC010F-2 qualifies as a parametric equivalent substitute. Both parts share identical electrical characteristics, thermal performance, and mechanical form factor. The primary distinction is packaging configuration: the main part is supplied in standard packaging, while the substitute is available in Tape & Reel (TR) format for automated assembly processes.

Parameter Comparison

Parameter	FEMTOSMDC010F-02	FEMTOSMDC010F-2	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	✓
Series	PolySwitch®, femtoSMD	PolySwitch®, femtoSMD	✓
Type	Polymeric	Polymeric	✓
Voltage - Max	12V	12V	✓
Current - Hold (Ih) (Max)	100 mA	100 mA	✓
Current - Trip (It)	250 mA	250 mA	✓
Current - Max	40 A	40 A	✓
Time to Trip	100 ms	100 ms	✓
Resistance - Initial (Ri) (Min)	1.7 Ohms	1.7 Ohms	✓
Resistance - Post Trip (R1) (Max)	8 Ohms	8 Ohms	✓
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	0603 (1608 Metric), Concave	0603 (1608 Metric), Concave	✓
Size / Dimension	0.063" L x 0.032" W (1.60mm x 0.80mm)	0.063" L x 0.032" W (1.60mm x 0.80mm)	✓
Thickness (Max)	0.033" (0.85mm)	0.033" (0.85mm)	✓
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	✓
Packaging Format	Standard	Tape & Reel (TR)	Different

Engineering Selection Recommendations

Both FEMTOSMDC010F-02 and FEMTOSMDC010F-2 are Active status components from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts depends on procurement and assembly requirements:

FEMTOSMDC010F-02: Use for standard packaging requirements or low-volume applications where individual component handling is acceptable.
FEMTOSMDC010F-2: Use for high-volume production environments requiring automated pick-and-place assembly. Tape & Reel packaging provides improved handling efficiency and reduced component damage during manufacturing.

Both parts carry CSA, TUV, and UL certifications and maintain ROHS3 compliance, meeting regulatory requirements for consumer and industrial applications. Moisture Sensitivity Level 1 (Unlimited) indicates no special storage or handling precautions are required.

Frequently Asked Questions (FAQ)

Q: Can FEMTOSMDC010F-2 be used as a direct replacement for FEMTOSMDC010F-02?

A: Yes. Both parts are parametric equivalents with identical electrical characteristics, thermal performance, and mechanical dimensions. The only difference is packaging format (Tape & Reel versus standard packaging). Electrical performance and circuit protection behavior are identical.

Q: What is the difference between the two part numbers?

A: The suffix "-02" and "-2" indicate different packaging configurations. FEMTOSMDC010F-02 uses standard packaging, while FEMTOSMDC010F-2 is supplied in Tape & Reel format for automated assembly. All other specifications remain unchanged.

Q: Are there any compatibility concerns when switching between these parts?

A: No compatibility concerns exist. Both parts use the same 0603 (1608 Metric) surface mount package with concave geometry, identical lead spacing, and matching electrical performance. PCB footprints and assembly processes are interchangeable.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both FEMTOSMDC010F-02 and FEMTOSMDC010F-2 carry CSA, TUV, and UL certifications and are ROHS3 compliant. Regulatory compliance is identical.

Q: Which part should be selected for high-volume manufacturing?

A: FEMTOSMDC010F-2 (Tape & Reel format) is recommended for high-volume production due to compatibility with automated assembly equipment and improved handling efficiency.

Q: What is the hold current specification, and why is it important?

A: The hold current (Ih) is 100 mA maximum. This is the maximum continuous current the fuse can carry without tripping. Circuits operating above this threshold will trigger the trip current (250 mA) and activate protection.

Q: What operating temperature range is supported?

A: Both parts operate across -40°C to 85°C. This range covers standard industrial and consumer electronics applications.

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