MINISMDC014-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MINISMDC014-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® miniSMD series. This component is rated for 60V maximum voltage with a 140 mA hold current and is housed in a 1812 (4532 Metric) surface mount package. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	140 mA
Current - Max	10 A
Time to Trip	8 ms
Resistance - Initial (Ri) (Min)	1.5 Ohms
Resistance - Post Trip (R1) (Max)	6 Ohms
Operating Temperature	-40°C ~ 85°C
Package / Case	1812 (4532 Metric), Concave
Size / Dimension	0.179" L x 0.128" W (4.55mm x 3.24mm)
Thickness (Max)	0.035" (0.89mm)
Mounting Type	Surface Mount
Approval Agency	CSA, TUV, UL
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitution of the obsolete MINISMDC014-2 is determined by strict alignment of the following critical parameters:

Voltage rating: 60V maximum
Hold current (Ih): 140 mA maximum
Package form factor: 1812 (4532 Metric), Concave surface mount
Physical dimensions: 0.179" L x 0.128" W (4.55mm x 3.24mm)
Operating temperature range: -40°C ~ 85°C
Approval certifications: CSA, TUV, UL compliance

Three active alternatives meet these core substitution criteria. Variations in trip current (It), maximum current rating, time to trip, initial resistance, and post-trip resistance are secondary parameters that do not prevent functional substitution when the primary criteria are satisfied.

Parameter Comparison

Parameter	MINISMDC014-2 (Obsolete)	MINISMDC014F-2 (Littelfuse)	MF-MSMF014-2 (Bourns)	0ZCG0014FF2C (Bel Fuse)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.	Bel Fuse Inc.
Series	PolySwitch® miniSMD	PolySwitch® miniSMD	Multifuse® MF-MSMF	0ZCG
Product Status	Obsolete	Active	Active	Active
Voltage - Max	60V	60V	60V	60V
Current - Hold (Ih) (Max)	140 mA	140 mA	140 mA	140 mA
Current - Trip (It)	Not specified	280 mA	340 mA	300 mA
Current - Max	10 A	10 A	40 A	10 A
Time to Trip	8 ms	8 ms	150 ms	8 ms
Resistance - Initial (Ri) (Min)	1.5 Ohms	1.5 Ohms	400 mOhms	1.2 Ohms
Resistance - Post Trip (R1) (Max)	6 Ohms	6 Ohms	6.5 Ohms	6.5 Ohms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave	1812 (4532 Metric), Concave
Size / Dimension	0.179" L x 0.128" W (4.55mm x 3.24mm)	0.179" L x 0.128" W (4.55mm x 3.24mm)	0.179" L x 0.128" W (4.55mm x 3.24mm)	0.179" L x 0.128" W (4.55mm x 3.24mm)
Thickness (Max)	0.035" (0.89mm)	0.035" (0.89mm)	0.043" (1.10mm)	0.035" (0.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV	AEC-Q200, cURus, TUV
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	1 (Unlimited)	2A (4 Weeks)

Engineering Selection Recommendations

MINISMDC014F-2 (Littelfuse Inc.) is the primary direct substitute. This part maintains identical electrical specifications and physical dimensions as the obsolete MINISMDC014-2 while offering active product status and ROHS3 compliance. It is available in Cut Tape and Digi-Reel packaging with 247,400 units in stock.

0ZCG0014FF2C (Bel Fuse Inc.) is a secondary substitute that meets all core substitution criteria. This part carries AEC-Q200 automotive qualification and ROHS3 compliance. Physical dimensions and electrical parameters align with the original specification. Inventory availability is 3,400 units.

MF-MSMF014-2 (Bourns Inc.) is a tertiary substitute option. While it maintains the required voltage, hold current, and package form factor, it exhibits a higher maximum current rating (40 A versus 10 A) and extended time to trip (150 ms versus 8 ms). The thickness specification is 0.043" (1.10mm) compared to 0.035" (0.89mm) for the original part. This part carries AEC-Q200 qualification and ROHS3 compliance with 7,800 units in stock.

Frequently Asked Questions (FAQ)

Q: Can MINISMDC014F-2 be used as a direct replacement for MINISMDC014-2?

A: Yes. MINISMDC014F-2 is manufactured by the same supplier (Littelfuse Inc.) in the same series (PolySwitch® miniSMD) with identical electrical ratings (60V, 140 mA hold current), identical time to trip (8 ms), and identical physical dimensions (1812 package, 0.179" L x 0.128" W). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What are the key differences between the three substitute options?

A: MINISMDC014F-2 and 0ZCG0014FF2C maintain the 8 ms trip time specification. MF-MSMF014-2 has a 150 ms trip time, which represents a significant behavioral difference in fault response. MF-MSMF014-2 also has lower initial resistance (400 mOhms) and higher maximum current rating (40 A). The thickness of MF-MSMF014-2 is 0.043" versus 0.035" for the other options, which may affect PCB layout clearance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three active substitutes (MINISMDC014F-2, MF-MSMF014-2, and 0ZCG0014FF2C) are ROHS3 compliant. The original MINISMDC014-2 is RoHS non-compliant.

Q: Which substitute has the best availability?

A: MINISMDC014F-2 has the highest inventory with 247,400 units in stock, followed by MF-MSMF014-2 with 7,800 units and 0ZCG0014FF2C with 3,400 units.

Q: Does package thickness affect PCB assembly?

A: MF-MSMF014-2 has a maximum thickness of 0.043" (1.10mm) compared to 0.035" (0.89mm) for MINISMDC014F-2 and 0ZCG0014FF2C. This 0.008" difference may require clearance verification in designs with tight vertical constraints or specific component stacking requirements.

Q: What certifications should I consider for my application?

A: MINISMDC014F-2 carries CSA, TUV, and UL certifications matching the original part. 0ZCG0014FF2C and MF-MSMF014-2 carry AEC-Q200 automotive qualification in addition to TUV and cURus certifications. Selection depends on application requirements and regulatory standards.

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