CMT1-6-R Equivalent & Substitute Parts

Part Overview

The CMT1-6-R is a 7.5 mH common mode choke manufactured by Eaton - Electronics Division, designed for two-line power line filtering applications. This component features a through-hole mounting configuration with a maximum current rating of 2.27A and typical DC resistance of 130mOhm. The product is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and new design implementations where this specification remains applicable.

Substiute Parts

CMT1-6-R

Eaton - Electronics DivisionIn Stock: 799CMT1-6-R Datasheet

Current PartRFQ

SS28V-K25075-CH

KEMETIn Stock: 734SS28V-K25075-CH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMT1-6-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 7.5 mH (frequency measurement point may vary within acceptable engineering tolerance)
• Number of lines: 2-line configuration
• Mounting type: Through hole
• Package configuration: Vertical, 4 PC pin
• Filter classification: Power line common mode choke

Secondary Compatibility Parameters:

• Current rating must equal or exceed 2.27A
• DC resistance must not significantly exceed 130mOhm baseline
• Operating temperature range must encompass or overlap the application requirements
• Physical dimensions must accommodate existing PCB layouts

The SS28V-K25075-CH from KEMET meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SS28V-K25075-CH qualifies as a direct substitute for the CMT1-6-R based on matching core electrical and mechanical specifications. Both components provide 7.5 mH inductance in a 2-line, through-hole, vertical 4-pin configuration suitable for power line filtering applications.

Compliance and Status Considerations:

The SS28V-K25075-CH is classified as an active product with RoHS3 compliance and REACH unaffected status, providing supply chain continuity and regulatory alignment. The CMT1-6-R, being obsolete, presents sourcing constraints that the KEMET substitute resolves.

Parameter Variance Analysis:

The SS28V-K25075-CH exhibits a higher current rating (2.5A versus 2.27A), providing design margin. The DC resistance increases from 130mOhm to 160mOhm, a 23% variance that remains within acceptable engineering tolerance for common mode choke applications. The inductance measurement frequency differs (1 kHz versus 10 kHz), reflecting different test methodologies; both values represent the same component characteristic at their respective measurement points.

The operating temperature range of the substitute (-25°C ~ 120°C) is narrower than the original (-40°C ~ 125°C). Applications requiring the full -40°C lower limit or +125°C upper limit must evaluate this constraint against specific system requirements.

Physical dimensions show minimal variation (length +0.02", height -0.039"), compatible with standard PCB layouts designed for the original component.

Frequently Asked Questions (FAQ)

Q: Can the SS28V-K25075-CH directly replace the CMT1-6-R without circuit modifications?

A: Yes, the SS28V-K25075-CH provides equivalent electrical performance for the specified 7.5 mH, 2-line common mode choke function. Both components share identical mounting type, package configuration, and pin count. Physical dimensions are compatible with standard PCB layouts. No circuit modifications are required for functional substitution.

Q: What is the significance of the different inductance measurement frequencies (10 kHz versus 1 kHz)?

A: Inductance values are frequency-dependent. The CMT1-6-R specifies 7.5 mH @ 10 kHz, while the SS28V-K25075-CH specifies 7.5 mH @ 1 kHz. Both measurements represent the same component characteristic evaluated at different test frequencies. The inductance value itself remains 7.5 mH across the operational frequency range; the measurement frequency notation indicates the test condition used for specification verification.

Q: Does the 30mOhm increase in DC resistance affect circuit performance?

A: The DC resistance increase from 130mOhm to 160mOhm represents a 23% variance. For common mode choke applications, this variance typically remains within acceptable design tolerance. The substitute's higher current rating (2.5A versus 2.27A) provides compensating design margin. Applications with critical power dissipation or thermal constraints should verify this parameter against specific system requirements.

Q: Is the narrower operating temperature range of the substitute a limitation?

A: The SS28V-K25075-CH operates from -25°C to 120°C, compared to the CMT1-6-R range of -40°C to 125°C. This represents a narrower specification. Applications requiring operation at -40°C or +125°C must confirm that the substitute's temperature range accommodates the actual system environment. Most commercial and industrial applications operate within the -25°C to 120°C window, making this substitute suitable for these use cases.

Q: What packaging differences exist between these components?

A: The CMT1-6-R is supplied in bulk packaging, while the SS28V-K25075-CH is also supplied in bulk. Both components use identical through-hole, vertical 4-pin package configurations. No packaging-related compatibility issues exist for PCB assembly or handling procedures.

Q: Why is the CMT1-6-R classified as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of this product line. The SS28V-K25075-CH, classified as active, represents the current equivalent offering from KEMET. For new designs and ongoing system support, the active substitute ensures long-term supply chain availability and access to current manufacturing quality standards.