MINISMDC050-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MINISMDC050-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® miniSMD series. This component is rated for 24V maximum voltage with 500 mA hold current and is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently listed as Obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

MINISMDC050-2

Littelfuse Inc.In Stock: 1560MINISMDC050-2 Datasheet

Current PartRFQ

MINISMDC050F-2

LittelfuseIn Stock: 805277MINISMDC050F-2 Datasheet

DirectRFQ

MF-MSMF050-2

Bourns Inc.In Stock: 32466MF-MSMF050-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MINISMDC050-2 are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Package / Case: 1812 (4532 Metric), Concave
• Mounting Type: Surface Mount
• Current - Hold (Ih) (Max): 500 mA
• Time to Trip: 150 ms
• Resistance - Initial (Ri) (Min): 150 mOhms
• Resistance - Post Trip (R1) (Max): 1 Ohms
• Operating Temperature: -40°C ~ 85°C

Voltage Consideration: The MINISMDC050-2 operates at 24V maximum. Substitute parts must support the voltage requirements of the application circuit. Parts rated at lower maximum voltages may be used only in circuits where the actual operating voltage does not exceed the substitute part's rating.

Parameter Comparison

Engineering Selection Recommendations

MINISMDC050F-2 (Littelfuse Inc.)

This part is the direct equivalent to the obsolete MINISMDC050-2. Both components share identical electrical specifications, package dimensions, and thermal characteristics. The MINISMDC050F-2 is currently in Active product status with significantly higher inventory availability (805,200 pcs). This part achieves ROHS3 compliance, addressing environmental regulatory requirements. Approval certifications (CSA, TUV, UL) match the original specification. The packaging format is Tape & Reel (TR), suitable for automated assembly processes. This is the primary recommended substitute for direct replacement applications.

MF-MSMF050-2 (Bourns Inc.)

This part shares the same package format, hold current, trip time, and resistance characteristics as the MINISMDC050-2. However, the maximum voltage rating is 15V, which is lower than the original 24V specification. This part is suitable only for applications where the circuit voltage does not exceed 15V. The MF-MSMF050-2 offers advantages including ROHS3 compliance, AEC-Q200 automotive qualification, and unlimited moisture sensitivity level (MSL 1). The thickness specification is 0.033" (0.85mm), compared to 0.024" (0.62mm) for the original part, which may affect PCB layout considerations. This part is available in Cut Tape (CT) and Digi-Reel® packaging formats.

Frequently Asked Questions (FAQ)

Q: Can MINISMDC050F-2 be used as a direct replacement for MINISMDC050-2?

A: Yes. The MINISMDC050F-2 is electrically and mechanically equivalent to the MINISMDC050-2. Both parts are manufactured by Littelfuse in the PolySwitch® miniSMD series with identical voltage, current, resistance, and thermal specifications. The MINISMDC050F-2 is the active production equivalent.

Q: What is the voltage limitation when considering MF-MSMF050-2 as a substitute?

A: The MF-MSMF050-2 has a maximum voltage rating of 15V, compared to 24V for the MINISMDC050-2. This part can only be used in circuits where the actual operating voltage does not exceed 15V. Exceeding this voltage rating will compromise component performance and reliability.

Q: Are there packaging differences between the substitute parts?

A: Yes. The MINISMDC050F-2 is supplied in Tape & Reel (TR) format, while the MF-MSMF050-2 is available in Cut Tape (CT) and Digi-Reel® formats. Additionally, the MF-MSMF050-2 has a maximum thickness of 0.033" (0.85mm) versus 0.024" (0.62mm) for the Littelfuse parts. These differences may affect PCB assembly processes and board layout constraints.

Q: Do the substitute parts meet current environmental compliance standards?

A: Both MINISMDC050F-2 and MF-MSMF050-2 are ROHS3 compliant. The original MINISMDC050-2 is listed as RoHS non-compliant. If RoHS compliance is required for your application, either substitute part satisfies this requirement.

Q: What are the moisture sensitivity considerations?

A: The MINISMDC050-2 and MINISMDC050F-2 both have MSL 2A (4 Weeks) ratings. The MF-MSMF050-2 has MSL 1 (Unlimited), indicating superior moisture resistance and less stringent storage requirements. This may provide advantages for long-term inventory management.

Q: Are all substitute parts approved by the same certification agencies?

A: The MINISMDC050F-2 carries CSA, TUV, and UL approvals, matching the original part. The MF-MSMF050-2 carries cURus and TUV approvals. If specific agency approvals are required by your application standards, verify that the selected substitute meets those requirements.