CMF-SD35-2 Equivalent & Substitute Parts

Part Overview

The CMF-SD35-2 is a ceramic PTC resettable fuse manufactured by Bourns Inc., rated for 230V (600V internal) with a 100 mA hold current. This component is designed for surface mount applications in a 4-SMD cube package. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	Bourns Inc.
Series	CMF-SD
Voltage - Max	230V (600V Int)
Current - Hold (Ih)	100 mA
Current - Trip (It)	200 mA
Resistance - 25°C	35 Ohms
Mounting Type	Surface Mount
Package / Case	4-SMD Cube
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The CMF-SDP35A-2 qualifies as a substitute based on the following alignment criteria:

Identical voltage rating: 230V (600V internal)
Identical resistance at 25°C: 35 Ohms
Identical mounting type: Surface Mount
Identical package type: 4-SMD Cube
Same manufacturer: Bourns Inc.
Same base product series: CMF-SD

The CMF-SDP35A-2 operates within acceptable parameter variance for hold current (110 mA vs. 100 mA) and trip current (230 mA vs. 200 mA), maintaining functional compatibility in circuit protection applications.

Parameter Comparison

Parameter	CMF-SD35-2 (Main)	CMF-SDP35A-2 (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.
Product Status	Obsolete	Active
Voltage - Max	230V (600V Int)	230V (600V Int)
Current - Hold (Ih)	100 mA	110 mA
Current - Trip (It)	200 mA	230 mA
Current - Max	3 A	2.5 A
Time to Trip	200 ms	200 ms
Resistance - 25°C	35 Ohms	35 Ohms
Mounting Type	Surface Mount	Surface Mount
Package / Case	4-SMD Cube	4-SMD Cube
Size / Dimension	0.402" L x 0.354" W (10.20mm x 9.00mm)	0.344" L x 0.283" W (8.75mm x 7.20mm)
Thickness (Max)	0.425" (10.80mm)	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99

Engineering Selection Recommendations

The CMF-SDP35A-2 is the active production substitute for the obsolete CMF-SD35-2. Both components maintain identical voltage ratings, resistance values, and time-to-trip specifications. The CMF-SDP35A-2 is currently in active production status with higher inventory availability, ensuring long-term supply chain continuity.

Both parts are ROHS3 compliant and carry identical regulatory classifications (EAR99, HTSUS 8533.40.8070). The CMF-SDP35A-2 features a more compact footprint while maintaining electrical equivalence, making it suitable for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the CMF-SDP35A-2 directly replace the CMF-SD35-2 in existing designs?

A: Yes. Both components share identical voltage ratings (230V/600V internal), resistance (35 Ohms), and time-to-trip (200 ms). The CMF-SDP35A-2 has a slightly higher hold current (110 mA vs. 100 mA) and trip current (230 mA vs. 200 mA), which remains within acceptable circuit protection parameters for equivalent applications.

Q: What are the physical differences between these parts?

A: The CMF-SDP35A-2 has a smaller footprint (8.75mm x 7.20mm vs. 10.20mm x 9.00mm) and reduced thickness (10.20mm vs. 10.80mm). Both use identical 4-SMD cube packaging and surface mount technology, ensuring compatibility with standard PCB assembly processes.

Q: Why is the CMF-SD35-2 listed as obsolete?

A: The CMF-SD35-2 has been superseded by the CMF-SDP35A-2 in Bourns Inc.'s product line. The newer variant offers improved specifications and is maintained in active production.

Q: Are there compliance or regulatory differences?

A: No. Both components are ROHS3 compliant, carry identical ECCN (EAR99) and HTSUS classifications, and have unlimited moisture sensitivity level (MSL 1).

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