CMT2-6-R Equivalent & Substitute Parts

Part Overview

The CMT2-6-R is a 4.8 mH common mode choke manufactured by Eaton - Electronics Division, designed for two-line power line filtering applications. This through-hole component operates across a temperature range of -40°C to 125°C and supports a maximum current rating of 3.95A with a typical DC resistance of 53mOhm.

The CMT2-6-R is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

CMT2-6-R

Eaton - Electronics DivisionIn Stock: 895CMT2-6-R Datasheet

Current PartRFQ

750312185

Würth ElektronikIn Stock: 712750312185 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMT2-6-R is determined by the following critical parameters:

Core Electrical Parameters:

• Number of Lines: 2 (fixed requirement)
• Inductance Value: 4.8 mH (fixed requirement)
• Mounting Type: Through Hole (fixed requirement)
• Package / Case: Vertical, 4 PC Pin (fixed requirement)
• Operating Temperature Range: -40°C ~ 125°C (fixed requirement)

Allowable Variation Parameters:

• Inductance Measurement Frequency: May differ (10 kHz vs. 1 kHz)
• Current Rating (Max): May be lower than 3.95A if application permits
• DC Resistance (DCR): May be higher than 53mOhm if thermal and performance requirements are met

The substitute part 750312185 (Würth Elektronik MID-CMCP series) maintains the core electrical and mechanical specifications while operating within acceptable parameter tolerances for two-line common mode choke applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Current Rating

The CMT2-6-R supports a maximum current of 3.95A, while the substitute part 750312185 is rated for 2A maximum. Selection of the substitute requires verification that the application circuit operates at or below 2A. If the design requires current handling above 2A, the substitute is not suitable.

Secondary Consideration: Physical Dimensions

The substitute part 750312185 is substantially smaller in all dimensions (approximately 46% of original length, 36% of original width, and 50% of original height). PCB layout and mechanical clearance must be re-evaluated to confirm the smaller footprint is compatible with existing designs.

Tertiary Consideration: DC Resistance

The substitute exhibits higher DC resistance (74mOhm vs. 53mOhm typical). This results in increased power dissipation and heat generation. Thermal analysis of the application circuit is required to confirm acceptable operating conditions.

Compliance and Availability

The substitute part 750312185 is in active production status with RoHS3 compliance and REACH unaffected designation. The original CMT2-6-R is obsolete. For new designs or ongoing production, the substitute provides supply chain continuity and regulatory compliance assurance.

Frequently Asked Questions (FAQ)

Q: Can the 750312185 directly replace the CMT2-6-R in existing designs?

A: Direct replacement requires verification of three factors: (1) application current does not exceed 2A, (2) PCB layout accommodates the smaller physical dimensions, and (3) increased DC resistance (74mOhm vs. 53mOhm) does not create unacceptable thermal conditions. If all three conditions are met, the substitute is compatible.

Q: Why does the substitute have a lower current rating?

A: The 750312185 is designed for lower current applications. The lower current rating reflects the component's thermal and magnetic design specifications. Applications requiring 3.95A operation must use a different substitute or the original part if available from inventory.

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

A: Inductance values vary with frequency due to core material properties. Both components are specified at 4.8 mH, but measured at different frequencies. For power line filtering applications, this difference is acceptable provided the inductance value at the operating frequency meets circuit requirements.

Q: Are there any compliance or regulatory differences between the two parts?

A: Both parts share identical ECCN classification (EAR99). The substitute carries RoHS3 compliance and REACH unaffected status, providing regulatory assurance for new designs. The original part's compliance status is not specified in available data.

Q: What is the impact of higher DC resistance on circuit performance?

A: Higher DC resistance increases power dissipation (I²R losses) and generates additional heat. For a 2A circuit, the substitute dissipates approximately 0.296W compared to 0.212W for the original part. Thermal design must accommodate this 40% increase in dissipation.

Q: Can the substitute be used in applications requiring the original 3.95A rating?

A: No. The substitute is rated for 2A maximum. Operating above this rating risks component failure and circuit malfunction. Alternative substitutes with higher current ratings must be identified for such applications.