FEMTOSMDC008F-02 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The FEMTOSMDC008F-02 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® femtoSMD series. This surface mount 0603 (1608 Metric) component provides overcurrent protection at 15V with a 50 mA hold current rating. The device is active in production with full RoHS3 compliance and CSA/UL approval. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter ranges for this product category.

Key Parameters

Parameter	FEMTOSMDC008F-02
Voltage - Max	15V
Current - Hold (Ih) (Max)	50 mA
Current - Trip (It)	150 mA
Resistance - Initial (Ri) (Min)	3.8 Ohms
Time to Trip	100 ms
Package / Case	0603 (1608 Metric), Concave
Mounting Type	Surface Mount
Type	Polymeric
RoHS Status	RoHS3 Compliant
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitute parts for the FEMTOSMDC008F-02 are qualified based on the following criteria:

Mechanical Compatibility: All substitute parts must use the same 0603 (1608 Metric) surface mount package with concave configuration to ensure PCB footprint compatibility.

Electrical Parameters: Substitutes must maintain voltage rating at or above 15V maximum. Current hold (Ih) and trip (It) ratings may vary within the allowed operating range for polymeric PTC resettable fuses. Initial resistance (Ri) values are acceptable within the polymeric fuse specification range.

Material & Type: All substitutes must be polymeric PTC resettable fuses to maintain functional equivalence.

Compliance: All substitute parts must maintain RoHS3 compliance and recognized approval agency certifications (CSA, UL, cURus, or TUV).

Parameter Comparison

Parameter	FEMTOSMDC008F-02	0603L010YR	FEMTOSMDC008F-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Series	PolySwitch®, femtoSMD	POLY-FUSE®, 0603L	PolySwitch®, femtoSMDC
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	15V	15V	12V
Current - Hold (Ih) (Max)	50 mA	100 mA	80 mA
Current - Trip (It)	150 mA	300 mA	200 mA
Resistance - Initial (Ri) (Min)	3.8 Ohms	900 mOhms	2.8 Ohms
Time to Trip	100 ms	1 s	100 ms
Package / Case	0603 (1608 Metric), Concave	0603 (1608 Metric), Concave	0603 (1608 Metric), Concave
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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)	0.063" L x 0.032" W (1.60mm x 0.80mm)
Thickness (Max)	0.033" (0.85mm)	0.030" (0.75mm)	0.033" (0.85mm)
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Approval Agency	CSA, UL	cURus, TUV	CSA, UL
Product Status	Active	Active	Active

Engineering Selection Recommendations

0603L010YR: This part maintains the 15V maximum voltage rating and 0603 package footprint. The higher current hold (100 mA) and trip (300 mA) ratings indicate a higher protection threshold. The lower initial resistance (900 mOhms) and extended trip time (1 s) represent different protection characteristics. This part is RoHS3 compliant with cURus and TUV approvals. Selection is appropriate where higher current thresholds are acceptable.

FEMTOSMDC008F-2: This part operates at 12V maximum voltage, which is below the 15V specification of the primary part. The 80 mA hold current and 200 mA trip current represent intermediate protection levels. Initial resistance is 2.8 Ohms with 100 ms trip time matching the primary part's response speed. This part maintains CSA and UL approvals with RoHS3 compliance. Selection requires confirmation that 12V maximum voltage is compatible with the application circuit.

Frequently Asked Questions (FAQ)

Q: Can 0603L010YR be used as a direct replacement for FEMTOSMDC008F-02?

A: Both parts share the same 0603 (1608 Metric) surface mount package and 15V voltage rating. However, the 0603L010YR has higher current hold (100 mA vs. 50 mA) and trip (300 mA vs. 150 mA) ratings. Use this substitute only if the application circuit can tolerate higher protection thresholds.

Q: Is FEMTOSMDC008F-2 compatible with FEMTOSMDC008F-02 applications?

A: FEMTOSMDC008F-2 shares the same package and similar current characteristics but operates at 12V maximum voltage compared to 15V. This part is suitable only for circuits operating at 12V or below. Verify circuit voltage requirements before selection.

Q: Do all substitute parts maintain the same PCB footprint?

A: Yes. All three parts use the 0603 (1608 Metric) surface mount package with concave configuration. PCB footprints are mechanically compatible.

Q: What compliance certifications apply to these parts?

A: FEMTOSMDC008F-02 and FEMTOSMDC008F-2 carry CSA and UL approvals. 0603L010YR carries cURus and TUV approvals. All three parts are RoHS3 compliant.

Q: How do initial resistance values affect circuit performance?

A: Initial resistance (Ri) affects voltage drop across the fuse during normal operation. FEMTOSMDC008F-02 has 3.8 Ohms, FEMTOSMDC008F-2 has 2.8 Ohms, and 0603L010YR has 900 mOhms. Lower resistance results in lower voltage drop. Verify that circuit design accommodates the resistance value of the selected part.

Q: What is the significance of trip time differences?

A: FEMTOSMDC008F-02 and FEMTOSMDC008F-2 both trip in 100 ms. 0603L010YR trips in 1 s. Faster trip times provide quicker protection response. Select based on application overcurrent response requirements.

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