Equivalent & Substitute Parts for SMD030-2

Part Overview

The SMD030-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with a 300 mA hold current. This component is classified as Obsolete, which necessitates identification of equivalent substitute parts for ongoing design and procurement requirements. The part is designed for surface mount applications in the 2920 (7351 Metric) package format and provides overcurrent protection through polymeric PTC technology.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	300 mA
Current - Trip (It)	600 mA
Time to Trip	3 s
Resistance - Initial (Ri) (Min)	1.2 Ohms
Resistance - Post Trip (R1) (Max)	4.8 Ohms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2920 (7351 Metric)
Type	Polymeric

Substitute Part Grouping Explanation

Substitute parts for the SMD030-2 are qualified based on the following critical parameters that must match or remain within acceptable tolerances:

Voltage - Max: 60V (exact match required)
Current - Hold (Ih) (Max): 300 mA (exact match required)
Current - Trip (It): 600 mA (exact match required)
Time to Trip: 3 s (exact match required)
Resistance - Post Trip (R1) (Max): 4.8 Ohms (exact match required)
Operating Temperature Range: -40°C ~ 85°C (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Polymeric (exact match required)

The following parts meet these substitution criteria: SMD030F-2 (Littelfuse Inc.), MF-SM030-2 (Bourns Inc.), and 0ZCF0030FF2C (Bel Fuse Inc.). Package format variations (2-SMD versus 2920 Metric) are acceptable provided PCB footprint compatibility is verified during design integration.

Parameter Comparison

Parameter	SMD030-2 (Main)	SMD030F-2	MF-SM030-2	0ZCF0030FF2C
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bel Fuse Inc.
Voltage - Max	60V	60V	60V	60V
Current - Hold (Ih) (Max)	300 mA	300 mA	300 mA	300 mA
Current - Trip (It)	600 mA	600 mA	600 mA	600 mA
Current - Max	10 A	10 A	40 A	100 A
Time to Trip	3 s	3 s	3 s	3 s
Resistance - Initial (Ri) (Min)	1.2 Ohms	1.2 Ohms	900 mOhms	1 Ohms
Resistance - Post Trip (R1) (Max)	4.8 Ohms	4.8 Ohms	4.8 Ohms	4.8 Ohms
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
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
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	1 (Unlimited)	2A (4 Weeks)

Engineering Selection Recommendations

SMD030F-2 (Littelfuse Inc.) is the primary direct substitute, offering identical electrical parameters and the same manufacturer lineage. This part is Active status with ROHS3 compliance and maintains the same MSL rating. Package format is 2-SMD; PCB footprint verification is required.

MF-SM030-2 (Bourns Inc.) provides an alternative from a different manufacturer with identical hold and trip current specifications. This part features superior MSL rating (1, Unlimited) and includes AEC-Q200 automotive qualification. Initial resistance is lower at 900 mOhms. Package format is 2-SMD; PCB footprint verification is required.

0ZCF0030FF2C (Bel Fuse Inc.) is the manufacturer-recommended substitute with identical package format (2920 Metric, Concave). This part includes AEC-Q200 automotive qualification and ROHS3 compliance. Initial resistance is 1 Ohm. The concave package variant requires verification of PCB pad compatibility.

All three substitutes are Active status parts with current manufacturing availability and ROHS3 compliance, addressing the obsolescence of the original SMD030-2.

Frequently Asked Questions (FAQ)

Q: Can SMD030F-2 be used as a direct replacement for SMD030-2?

A: Yes. Both parts are manufactured by Littelfuse Inc. and share identical electrical parameters: 60V maximum voltage, 300 mA hold current, 600 mA trip current, and 3-second trip time. The primary difference is package format (2-SMD versus 2920 Metric). PCB footprint compatibility must be verified before implementation.

Q: What is the difference between the 2-SMD and 2920 (7351 Metric) package formats?

A: Both are surface mount packages with identical external dimensions (0.290" L x 0.202" W / 7.36mm x 5.12mm) and thickness (0.125" / 3.18mm). The designation difference reflects packaging and lead configuration variations. PCB pad layout and reflow profile compatibility must be confirmed with the specific PCB design.

Q: Why does MF-SM030-2 have a lower initial resistance (900 mOhms) compared to SMD030-2 (1.2 Ohms)?

A: Initial resistance variation within the specified maximum post-trip resistance of 4.8 Ohms is acceptable for PTC resettable fuse technology. The lower initial resistance of MF-SM030-2 does not affect the hold current, trip current, or trip time specifications. Circuit design must account for the voltage drop across the fuse at nominal operating current.

Q: Is 0ZCF0030FF2C compatible with existing PCB designs for SMD030-2?

A: 0ZCF0030FF2C uses the same 2920 (7351 Metric) package format as SMD030-2. However, the concave package variant may have different pad contact geometry. PCB pad design and reflow profile compatibility must be verified with the manufacturer's datasheet before production implementation.

Q: Which substitute part has the best compliance rating?

A: MF-SM030-2 and 0ZCF0030FF2C both include AEC-Q200 automotive qualification. MF-SM030-2 additionally offers unlimited MSL rating (1) compared to 2A (4 Weeks) for other parts, providing superior moisture handling during storage and assembly.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMD030F-2, MF-SM030-2, and 0ZCF0030FF2C are all ROHS3 compliant. The original SMD030-2 is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

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