SMD150-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The SMD150-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 15V maximum voltage and 1.5A hold current in a 2-SMD surface mount package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SMD150-2 provides overcurrent protection with automatic reset capability in compact surface mount form factor, suitable for low-voltage circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Max	15V
Current - Hold (Ih) (Max)	1.5 A
Current - Trip (It)	3 A
Resistance - Initial (Ri) (Min)	60 mOhms
Resistance - Post Trip (R1) (Max)	250 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD
Time to Trip	5 s

Substitute Part Grouping Explanation

Substitution eligibility for the SMD150-2 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Max: 15V or higher
Current - Hold (Ih) (Max): 1.5A
Current - Trip (It): 3A
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 85°C or wider
Resistance - Initial (Ri) and Post Trip (R1): Within specified tolerances

Substitute Classification:

Direct Equivalents (Identical Electrical & Mechanical Specifications):

SMD150F-2 (Littelfuse Inc.) - Active product status, identical 2-SMD package
MF-SM150-2 (Bourns Inc.) - Active product status, functionally equivalent with minor dimensional variance

Functional Substitute (Higher Voltage Rating):

0ZCF0150FF2C (Bel Fuse Inc.) - Meets current and hold specifications but operates at 33V maximum voltage with different package form factor (2920/7351 Metric)

Parameter Comparison

Parameter	SMD150-2	SMD150F-2	MF-SM150-2	0ZCF0150FF2C
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bel Fuse Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	15V	15V	15V	33V
Current - Hold (Ih) (Max)	1.5 A	1.5 A	1.5 A	1.5 A
Current - Trip (It)	3 A	3 A	3 A	3 A
Current - Max	40 A	40 A	100 A	100 A
Time to Trip	5 s	5 s	5 s	2 s
Resistance - Initial (Ri) (Min)	60 mOhms	60 mOhms	60 mOhms	50 mOhms
Resistance - Post Trip (R1) (Max)	250 mOhms	250 mOhms	250 mOhms	230 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	2-SMD	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, cURus, TUV

Engineering Selection Recommendations

For Direct PCB Replacement (Recommended Primary Choice):

SMD150F-2 is the preferred substitute. It maintains identical electrical specifications and 2-SMD package footprint compatibility with the obsolete SMD150-2. SMD150F-2 carries Active product status and achieves ROHS3 compliance, addressing regulatory requirements that the original part does not meet. Both components share identical voltage, current, and thermal characteristics, ensuring functional equivalence in circuit applications.

For Alternative Sourcing (Secondary Choice):

MF-SM150-2 (Bourns Multifuse® series) provides electrical equivalence with Active product status and ROHS3 compliance. Dimensional variance is minimal (0.344" L x 0.264" W versus 0.343" L x 0.250" W), and the 2-SMD package remains compatible with existing PCB layouts. MF-SM150-2 includes AEC-Q200 automotive qualification and improved moisture sensitivity rating (MSL 1 versus MSL 2A), offering enhanced reliability for demanding applications.

For Higher Voltage Applications (Conditional Use):

0ZCF0150FF2C operates at 33V maximum voltage, exceeding the SMD150-2 specification. This part is suitable only for circuits where higher voltage margin is acceptable and the 2920 package footprint can be accommodated. The faster trip time (2 s versus 5 s) and lower initial resistance (50 mOhms versus 60 mOhms) represent functional differences requiring circuit validation.

Frequently Asked Questions (FAQ)

Q: Can SMD150F-2 be used as a direct replacement for SMD150-2?

A: Yes. SMD150F-2 is electrically and mechanically equivalent to SMD150-2. Both components share identical voltage (15V), hold current (1.5A), trip current (3A), and 2-SMD package specifications. SMD150F-2 is the recommended substitute due to Active product status and ROHS3 compliance.

Q: What is the difference between SMD150F-2 and MF-SM150-2?

A: Both parts meet the electrical requirements of SMD150-2 with identical voltage, current, and thermal ratings. Primary differences are manufacturer (Littelfuse versus Bourns), packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), and moisture sensitivity level (MSL 2A versus MSL 1). MF-SM150-2 includes AEC-Q200 automotive qualification.

Q: Can 0ZCF0150FF2C replace SMD150-2 in existing designs?

A: 0ZCF0150FF2C is not a direct replacement. While it maintains the 1.5A hold current and 3A trip current, it operates at 33V maximum voltage and uses a different package form factor (2920 versus 2-SMD). PCB layout modification is required. Use this part only when higher voltage rating is needed and circuit design permits package change.

Q: Why is SMD150-2 marked as Obsolete?

A: SMD150-2 is no longer in active production. SMD150F-2 and MF-SM150-2 are the recommended active alternatives for new designs and ongoing procurement.

Q: Are there compliance differences between these parts?

A: SMD150-2 is RoHS non-compliant. SMD150F-2 and MF-SM150-2 are both ROHS3 compliant. For applications requiring RoHS compliance, either SMD150F-2 or MF-SM150-2 must be selected.

Q: What is the impact of different trip times (5 s versus 2 s)?

A: Trip time determines how quickly the fuse responds to overcurrent. SMD150-2, SMD150F-2, and MF-SM150-2 all have 5-second trip times. 0ZCF0150FF2C has a 2-second trip time, providing faster protection. Circuit design must accommodate this difference if 0ZCF0150FF2C is selected.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message