MINISMDC150-2 Equivalent & Substitute Parts

Part Overview

The MINISMDC150-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® miniSMD series. This component is rated for 6V maximum voltage with a 1.5A hold current and 3A trip current, designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	6V
Current - Hold (Ih) (Max)	1.5 A
Current - Trip (It)	3 A
Current - Max	100 A
Time to Trip	500 ms
Resistance - Initial (Ri) (Min)	40 mOhms
Resistance - Post Trip (R1) (Max)	110 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	1812 (4532 Metric), Concave
Type	Polymeric

Substitute Part Grouping Explanation

Substitute components for the MINISMDC150-2 must maintain electrical and mechanical compatibility based on the following critical parameters:

Electrical Compatibility Requirements:

Voltage rating: 6V maximum
Hold current (Ih): 1.5A maximum
Trip current (It): 3A
Operating temperature range: -40°C to 85°C
Time to trip: 500 ms

Mechanical Compatibility Requirements:

Package format: 1812 (4532 Metric), Concave
Surface mount configuration
Physical dimensions: 0.179" L x 0.128" W (4.55mm x 3.24mm)

The identified substitute parts meet these core requirements while offering improved product status and compliance characteristics.

Parameter Comparison

Parameter	MINISMDC150-2	MINISMDC150F-2	MF-MSMF150-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	6V	6V	6V
Current - Hold (Ih) (Max)	1.5 A	1.5 A	1.5 A
Current - Trip (It)	3 A	3 A	3 A
Current - Max	100 A	100 A	100 A
Time to Trip	500 ms	500 ms	500 ms
Resistance - Initial (Ri) (Min)	40 mOhms	40 mOhms	30 mOhms
Resistance - Post Trip (R1) (Max)	110 mOhms	110 mOhms	120 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave
Type	Polymeric	Polymeric	Polymeric
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV
Thickness (Max)	0.019" (0.48mm)	0.019" (0.48mm)	0.033" (0.85mm)
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	1 (Unlimited)

Engineering Selection Recommendations

MINISMDC150F-2 (Littelfuse Inc.) is the primary substitute option. This part maintains identical electrical specifications and physical dimensions to the obsolete MINISMDC150-2 while offering active product status. The MINISMDC150F-2 achieves ROHS3 compliance and is available in higher inventory quantities (125,200 pcs), supporting production continuity. Packaging is provided in Tape & Reel format.

MF-MSMF150-2 (Bourns Inc.) serves as an alternative substitute from a different manufacturer. This Multifuse® component meets all core electrical requirements with equivalent hold current, trip current, and operating temperature specifications. The MF-MSMF150-2 features improved initial resistance (30 mOhms vs. 40 mOhms) and superior moisture sensitivity rating (MSL 1 vs. 2A). However, the maximum thickness is 0.033" (0.85mm) compared to 0.019" (0.48mm) for the original part, requiring PCB layout verification for height-constrained applications. This part carries AEC-Q200 automotive qualification and is available in Cut Tape and Digi-Reel® packaging.

Both substitutes provide ROHS3 compliance and active product status, addressing the obsolescence of the original MINISMDC150-2.

Frequently Asked Questions (FAQ)

Q: Can MINISMDC150F-2 be used as a direct replacement for MINISMDC150-2?

A: Yes. The MINISMDC150F-2 maintains identical electrical parameters (6V, 1.5A hold, 3A trip, 500ms trip time) and physical dimensions (1812 package, 0.019" maximum thickness). Both are Littelfuse PolySwitch® miniSMD series components. The primary difference is product status: MINISMDC150F-2 is active with ROHS3 compliance.

Q: What is the key difference between MINISMDC150F-2 and MF-MSMF150-2?

A: Both parts meet the core electrical specifications. The MF-MSMF150-2 offers lower initial resistance (30 mOhms vs. 40 mOhms) and better moisture sensitivity (MSL 1 vs. 2A). However, its maximum thickness is 0.033" compared to 0.019" for the Littelfuse part. PCB layout must accommodate this height difference. The MF-MSMF150-2 includes AEC-Q200 automotive qualification.

Q: Are there any compatibility concerns with package thickness?

A: The MINISMDC150F-2 maintains the original 0.019" (0.48mm) maximum thickness. The MF-MSMF150-2 has a maximum thickness of 0.033" (0.85mm). If the original design has height constraints or tight PCB clearances, the Littelfuse MINISMDC150F-2 is the preferred choice. The Bourns part requires verification of available board space.

Q: What are the resistance specifications for each part?

A: MINISMDC150-2 and MINISMDC150F-2 both specify 40 mOhms minimum initial resistance and 110 mOhms maximum post-trip resistance. The MF-MSMF150-2 specifies 30 mOhms minimum initial resistance and 120 mOhms maximum post-trip resistance. These variations remain within acceptable operating parameters for 6V, 1.5A applications.

Q: Which part should be selected for new designs?

A: MINISMDC150F-2 is recommended for new designs requiring direct compatibility with existing MINISMDC150-2 specifications. It provides active product status, ROHS3 compliance, and identical physical dimensions. MF-MSMF150-2 is suitable when automotive qualification (AEC-Q200) or superior moisture sensitivity is required, provided PCB layout accommodates the increased thickness.

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