SMD100-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The SMD100-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 30V maximum voltage and 1.1A hold current in a 2920 (7351 Metric) surface mount package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Polymeric PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds the trip threshold, then resetting when the fault condition is removed. The SMD100-2 is suitable for applications requiring 30V operation with 1.1A hold current protection.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Time to Trip	500 ms
Resistance - Initial (Ri) (Min)	120 mOhms
Resistance - Post Trip (R1) (Max)	480 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2920 (7351 Metric)
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the SMD100-2 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage rating equal to or greater than 30V
Hold current (Ih) of 1.1A
Trip current (It) of 2.2A
Operating temperature range of -40°C to 85°C
Polymeric PTC type
Surface mount configuration

Secondary Compatibility Factors:

Package form factor (2920 or 2-SMD equivalent)
Initial resistance (Ri) and post-trip resistance (R1) within acceptable ranges
Approval agencies (CSA, TUV, UL certification)

Three substitute parts meet these criteria with varying compliance and availability profiles.

Parameter Comparison

Parameter	SMD100-2 (Main)	SMD100F-2	MF-SM100-2	0ZCF0110FF2C
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bel Fuse Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	30V	30V	30V	33V
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	80 A	100 A
Time to Trip	500 ms	500 ms	500 ms	500 ms
Resistance - Initial (Ri) (Min)	120 mOhms	120 mOhms	120 mOhms	90 mOhms
Resistance - Post Trip (R1) (Max)	480 mOhms	480 mOhms	480 mOhms	410 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2920 (7351 Metric)	2-SMD	2-SMD	2920 (7351 Metric), Concave
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
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	1 (Unlimited)	2A (4 Weeks)

Engineering Selection Recommendations

SMD100F-2 (Littelfuse Inc.)

This substitute offers the closest electrical match to the SMD100-2 with identical voltage, current, and resistance specifications. The SMD100F-2 is Active status with ROHS3 compliance, addressing the obsolescence of the original part. The 2-SMD package differs from the original 2920 form factor and requires PCB layout verification. Littelfuse manufacturing continuity provides supply chain stability.

MF-SM100-2 (Bourns Inc.)

The Multifuse MF-SM100-2 meets all critical electrical parameters with identical hold current, trip current, and operating temperature range. This part carries AEC-Q200 automotive qualification and ROHS3 compliance. The 1 MSL rating provides superior moisture handling compared to the original 2A specification. The 2-SMD package requires PCB footprint validation. Higher maximum current rating (80A) provides additional design margin.

0ZCF0110FF2C (Bel Fuse Inc.)

The 0ZCF0110FF2C maintains the original 2920 (7351 Metric) package form factor, minimizing PCB layout changes. Electrical parameters match the SMD100-2 with 1.1A hold current and 2.2A trip current. The 33V maximum voltage rating exceeds the original 30V specification. AEC-Q200 and ROHS3 compliance ensure modern qualification standards. Lower initial resistance (90 mOhms) and post-trip resistance (410 mOhms) provide tighter performance tolerance.

Frequently Asked Questions (FAQ)

Q: Can SMD100F-2 be used as a direct replacement for SMD100-2?

A: SMD100F-2 matches all electrical specifications (30V, 1.1A hold, 2.2A trip, 500ms trip time) and is manufactured by the same company. However, the package changes from 2920 to 2-SMD, requiring PCB footprint verification before implementation.

Q: What is the primary advantage of MF-SM100-2 over SMD100F-2?

A: MF-SM100-2 includes AEC-Q200 automotive qualification and offers unlimited moisture sensitivity (MSL 1) versus 4-week MSL on SMD100F-2. The 80A maximum current rating provides greater design margin for transient conditions.

Q: Why does 0ZCF0110FF2C have a 33V rating when the original is 30V?

A: The 33V rating is a higher specification that maintains backward compatibility with 30V applications. Higher voltage ratings do not affect performance in lower voltage circuits and provide additional safety margin.

Q: Are all substitute parts RoHS compliant?

A: Yes. SMD100F-2, MF-SM100-2, and 0ZCF0110FF2C are all ROHS3 compliant. The original SMD100-2 is RoHS non-compliant, making substitution necessary for RoHS-regulated applications.

Q: Which substitute maintains the closest physical footprint to SMD100-2?

A: 0ZCF0110FF2C retains the 2920 (7351 Metric) package form factor, minimizing PCB layout modifications. SMD100F-2 and MF-SM100-2 use 2-SMD packages with different dimensions.

Q: What is the difference between 2920 and 2-SMD packages?

A: 2920 (7351 Metric) is a specific rectangular form factor measuring 7.36mm x 5.12mm. 2-SMD is a generic surface mount dual-pad configuration. Physical dimensions vary between manufacturers; PCB footprint verification is required when switching package types.

Q: Can these parts be used interchangeably in automotive applications?

A: MF-SM100-2 and 0ZCF0110FF2C carry AEC-Q200 qualification for automotive use. SMD100F-2 does not list AEC-Q200 certification. Automotive applications should prioritize AEC-Q200 qualified parts.

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