CMF-SD50-2 Equivalent & Substitute Parts

Part Overview

The CMF-SD50-2 is a ceramic PTC resettable fuse manufactured by Bourns Inc., rated for 230V (600V internal) with a 90 mA hold current. This component is designed for surface mount applications in 4-SMD cube packaging. The part is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and component procurement.

Substiute Parts

CMF-SD50-2

Bourns Inc.In Stock: 941CMF-SD50-2 Datasheet

Current PartRFQ

CMF-SDP50A-2

Bourns Inc.In Stock: 3005CMF-SDP50A-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMF-SD50-2 is determined by the following critical parameters:

• Voltage rating: 230V (600V internal) minimum
• Current hold (Ih): 90 mA maximum
• Current trip (It): 190 mA
• Resistance at 25°C: 50 Ohms
• Package type: 4-SMD Cube surface mount
• Component type: Ceramic PTC resettable fuse

The CMF-SDP50A-2 meets all core electrical and mechanical requirements for direct substitution. Both parts share identical voltage ratings, hold current specifications, trip current values, and resistance characteristics. Both are ceramic PTC resettable fuses in 4-SMD cube surface mount packages with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The CMF-SDP50A-2 is the direct substitute for the obsolete CMF-SD50-2. Both components are manufactured by Bourns Inc. and share the same base product number (CMF-SD series), confirming design lineage and compatibility.

The CMF-SDP50A-2 is currently in active production status with 2900 units available in stock, compared to the CMF-SD50-2 which is obsolete with limited remaining inventory. Both parts maintain ROHS3 compliance and identical electrical specifications for voltage, hold current, trip current, and resistance.

Differences in maximum current rating (3 A vs. 2.5 A) and trip time (100 ms vs. 200 ms) are secondary parameters that do not affect core substitution eligibility when the primary hold and trip current specifications are met. The CMF-SDP50A-2 includes specified operating temperature range (-40°C ~ 125°C), whereas the original part does not provide this specification.

Frequently Asked Questions (FAQ)

Q: Can the CMF-SDP50A-2 directly replace the CMF-SD50-2 in existing designs?

A: Yes. Both parts share identical voltage ratings (230V / 600V internal), hold current (90 mA), trip current (190 mA), resistance (50 Ohms), and 4-SMD cube package specifications. The CMF-SDP50A-2 is the active production equivalent.

Q: What are the differences between these two parts?

A: The CMF-SDP50A-2 has a lower maximum current rating (2.5 A vs. 3 A) and slower trip time (200 ms vs. 100 ms). The substitute includes a specified operating temperature range (-40°C ~ 125°C). The original CMF-SD50-2 is obsolete; the CMF-SDP50A-2 is in active production.

Q: Are the physical dimensions compatible?

A: Both parts use 4-SMD cube surface mount packaging. The CMF-SDP50A-2 has slightly smaller footprint dimensions (8.75mm x 7.20mm vs. 10.20mm x 9.00mm) and thickness (10.20mm vs. 10.80mm). PCB layout verification is required for space-constrained applications.

Q: What is the packaging difference?

A: The CMF-SD50-2 packaging type is not specified in available data. The CMF-SDP50A-2 is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly.

Q: Are both parts RoHS compliant?

A: Yes. Both the CMF-SD50-2 and CMF-SDP50A-2 are ROHS3 compliant. The CMF-SDP50A-2 is REACH affected, while the original part is REACH unaffected.