MICROSMD110-2 Equivalent & Substitute Parts

Part Overview

The MICROSMD110-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 6V maximum voltage with 1.1 A hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part is housed in a 1210 (3225 Metric) surface mount package with concave configuration, suitable for automated assembly processes.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Package / Case	1210 (3225 Metric), Concave
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the MICROSMD110-2 is determined by the following critical parameters:

Voltage rating (6V maximum)
Current hold rating (1.1 A maximum)
Current trip rating (2.2 A)
Package configuration (1210 surface mount, concave)
Operating temperature range (-40°C ~ 85°C)
Polymeric PTC fuse type

Parts meeting these specifications are classified as direct equivalents. Parts with voltage ratings exceeding 6V or other parameter variations are noted as manufacturer-recommended alternatives with specific application considerations.

Parameter Comparison

Parameter	MICROSMD110-2	MICROSMD110F-2	MF-USMF110-2	0ZCH0110FF2E
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bel Fuse Inc.
Voltage - Max	6V	6V	6V	8V
Current - Hold (Ih) (Max)	1.1 A	1.1 A	1.1 A	1.1 A
Current - Trip (It)	2.2 A	2.2 A	2.2 A	2.2 A
Current - Max	40 A	40 A	40 A	100 A
Time to Trip	200 ms	200 ms	1 s	300 ms
Resistance - Initial (Ri) (Min)	70 mOhms	70 mOhms	50 mOhms	60 mOhms
Resistance - Post Trip (R1) (Max)	210 mOhms	210 mOhms	210 mOhms	210 mOhms
Package / Case	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave	1210 (3225 Metric), Concave
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV, AEC-Q200	AEC-Q200, cURus, TUV

Engineering Selection Recommendations

MICROSMD110F-2 (Littelfuse Inc.) is the primary direct equivalent. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. Approval agencies remain consistent (CSA, TUV, UL).

MF-USMF110-2 (Bourns Inc.) is a functional equivalent with identical voltage, current hold, and current trip ratings. This part carries AEC-Q200 automotive qualification and ROHS3 compliance. Time to trip extends to 1 second compared to 200 milliseconds for the original part, and initial resistance is lower at 50 mOhms minimum. Moisture sensitivity is superior (MSL 1 vs. 2A). Selection requires confirmation that extended trip time is acceptable for the application.

0ZCH0110FF2E (Bel Fuse Inc.) is a manufacturer-recommended alternative with elevated voltage rating (8V) and maximum current (100 A). This part is suitable for applications where higher voltage headroom is beneficial. Time to trip is 300 milliseconds. AEC-Q200 qualification is included. Selection requires verification that the 8V rating does not introduce unintended circuit behavior.

Frequently Asked Questions (FAQ)

Q: Can MICROSMD110F-2 be used as a direct replacement for MICROSMD110-2?

A: Yes. MICROSMD110F-2 maintains identical electrical parameters (6V, 1.1 A hold, 2.2 A trip) and package configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance improvement. Approval agencies are unchanged.

Q: What is the key difference between MF-USMF110-2 and the original part?

A: MF-USMF110-2 extends time to trip from 200 milliseconds to 1 second and reduces initial resistance from 70 mOhms to 50 mOhms minimum. Voltage and current ratings remain identical. Applications requiring faster response times should retain the original specification or select MICROSMD110F-2.

Q: Is 0ZCH0110FF2E compatible with circuits designed for 6V operation?

A: 0ZCH0110FF2E is rated for 8V maximum voltage and is mechanically compatible in the 1210 package. The higher voltage rating does not prevent operation in 6V circuits. However, the elevated maximum current (100 A vs. 40 A) and extended time to trip (300 ms) represent functional differences that require application-level verification.

Q: Are all substitute parts available in the same packaging options?

A: MICROSMD110F-2 is available in Cut Tape (CT) and Digi-Reel packaging. MF-USMF110-2 and 0ZCH0110FF2E are supplied in Tape & Reel (TR) format. Packaging selection depends on assembly process requirements and procurement volume.

Q: Which substitute part offers the best compliance profile?

A: MICROSMD110F-2, MF-USMF110-2, and 0ZCH0110FF2E all meet ROHS3 compliance. MF-USMF110-2 and 0ZCH0110FF2E include AEC-Q200 automotive qualification. Selection based on compliance depends on end-application requirements and supply chain standards.

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