CMT3-1-R Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMT3-1-R is a 5.4 mH, 2-line common mode choke manufactured by Eaton - Electronics Division, designed for power line filtering applications in through-hole configurations. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates at 2A maximum current with 120 mOhm typical DC resistance and is rated for -40°C to 125°C operating temperature range.

Substiute Parts

CMT3-1-R

Eaton - Electronics DivisionIn Stock: 946CMT3-1-R Datasheet

Current PartRFQ

SS30V-300054

KEMETIn Stock: 1276SS30V-300054 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMT3-1-R is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Filter Type: Power Line (must match)
• Number of Lines: 2 (must match)
• Inductance Value: 5.4 mH (must match)
• DC Resistance: 120 mOhm (must match or be lower)
• Current Rating: Must equal or exceed 2A
• Operating Temperature Range: Must encompass or exceed -40°C ~ 125°C

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole (must match)
• Pin Configuration: 4 PC Pin (must match)
• Package orientation and footprint compatibility

The substitute part SS30V-300054 from KEMET meets the core electrical requirements with matching inductance (5.4 mH), matching DC resistance (120 mOhm), and exceeding current capacity (3A vs. 2A). However, mechanical differences exist in package dimensions and orientation, requiring board-level design verification.

Parameter Comparison

Engineering Selection Recommendations

Electrical Suitability: The SS30V-300054 substitute satisfies the core electrical requirements of the CMT3-1-R. Both components provide 5.4 mH inductance and 120 mOhm DC resistance for 2-line power line filtering. The substitute's 3A current rating exceeds the original 2A specification, providing additional margin. The AC voltage rating of 250V on the substitute provides explicit specification where the original part does not.

Temperature Range Consideration: The substitute operates from -25°C to 120°C, which is narrower than the original -40°C to 125°C range. Applications requiring operation below -25°C or above 120°C cannot use this substitute without additional thermal analysis.

Mechanical Compatibility: The substitute differs in package orientation (vertical vs. horizontal) and physical dimensions. The SS30V-300054 is larger in length (31.00 mm vs. 25.00 mm) and significantly taller (33.00 mm vs. 14.00 mm). PCB layout modifications are required for mechanical accommodation.

Compliance Status: The substitute is active product status with ROHS3 compliance certification, providing supply chain continuity and regulatory alignment. The original part's obsolete status necessitates substitution for new procurement.

Frequently Asked Questions (FAQ)

Q: Can SS30V-300054 be used as a direct drop-in replacement for CMT3-1-R?

A: No. While electrical parameters are compatible, the substitute has different package orientation (vertical vs. horizontal) and larger physical dimensions (31.00 mm L x 22.50 mm W x 33.00 mm H vs. 25.00 mm L x 25.00 mm W x 14.00 mm H). PCB layout redesign is required.

Q: What are the critical electrical parameters for substitution?

A: The following parameters must match or be exceeded: Filter Type (Power Line), Number of Lines (2), Inductance (5.4 mH), DC Resistance (120 mOhm), and Current Rating (minimum 2A). The substitute meets all these criteria.

Q: Does the substitute meet temperature requirements?

A: The substitute operates from -25°C to 120°C, which is narrower than the original -40°C to 125°C range. Applications requiring operation at -40°C or above 120°C require alternative solutions.

Q: Are there compliance differences between the parts?

A: The substitute is ROHS3 compliant and REACH unaffected, providing modern regulatory compliance. The original part's compliance status is not specified. Both share EAR99 ECCN classification.

Q: What is the impact of the different inductance test frequencies?

A: The original part specifies 5.4 mH @ 10 kHz while the substitute specifies 5.4 mH @ 1 kHz. Both provide the same inductance value at their respective test frequencies. Application-specific frequency response analysis may be required for critical filtering applications.

Q: How does the higher current rating of the substitute affect selection?

A: The substitute's 3A rating exceeds the original 2A requirement, providing additional thermal margin and component reliability. This is advantageous for applications with current margin requirements or future design scaling.