CMT-02107 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMT-02107 is a 7 mH common mode choke manufactured by Tamura, designed for two-line filtering applications with a 1A current rating and 500 mOhm DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The through-hole mounting configuration and compact dimensions (28.00mm L x 14.50mm W) define its mechanical footprint in legacy circuit designs.

Substiute Parts

CMT-02107

TamuraIn Stock: 877CMT-02107 Datasheet

Current PartRFQ

7116-RC

Bourns Inc.In Stock: 13627116-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMT-02107 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Number of Lines: Must equal 2
• Mounting Type: Must be Through Hole
• Package Configuration: Must be Vertical, No Base, 4 PC Pin
• Moisture Sensitivity Level: Must be 1 (Unlimited) or equivalent

Allowable Parameter Variance:

• Inductance @ 1 kHz: Substitute may range from 6.8 mH to 7 mH (within ±3% tolerance typical for common mode chokes)
• Current Rating (Max): Substitute must be ≥1A; higher ratings provide design margin
• DC Resistance (Max): Substitute may be lower than 500 mOhm; higher values are not acceptable
• Voltage Rating (AC): Substitute must be ≥250V

The Bourns 7116-RC meets all mandatory criteria and falls within allowable variance for electrical parameters, qualifying it as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Bourns 7116-RC

The 7116-RC is the qualified substitute for the obsolete CMT-02107. Selection is based on the following engineering factors:

• Product Status: The 7116-RC is Active, ensuring long-term availability and supply chain continuity, whereas the CMT-02107 is Obsolete.
• Electrical Compatibility: The 6.8 mH inductance at 1 kHz represents a −2.9% deviation from the original 7 mH specification, which is within typical tolerance bands for common mode choke applications. The 2A current rating exceeds the 1A requirement, providing additional design margin. The 200 mOhm DCR is superior to the original 500 mOhm specification, reducing power dissipation.
• Mechanical Compatibility: Both components feature identical mounting type (Through Hole), package configuration (Vertical, No Base, 4 PC Pin), and moisture sensitivity level (MSL 1).
• Compliance: The 7116-RC is RoHS3 Compliant and REACH Unaffected, meeting modern regulatory requirements.

Footprint Consideration: The 7116-RC has a smaller physical footprint (22.86 x 16.51 mm vs. 28.00 x 14.50 mm) and lower height (22.86 mm vs. 28.00 mm). PCB layout verification is required to confirm that the reduced dimensions do not conflict with existing board routing or component placement constraints.

Frequently Asked Questions (FAQ)

Q1: Can the Bourns 7116-RC be used as a direct replacement for the Tamura CMT-02107 without circuit modification?

A: The 7116-RC is electrically compatible with the CMT-02107 based on the provided specifications. The 6.8 mH inductance is within acceptable tolerance of the original 7 mH specification. The higher current rating (2A vs. 1A) and lower DC resistance (200 mOhm vs. 500 mOhm) are advantageous. However, PCB layout verification is mandatory due to dimensional differences. The smaller footprint may require repositioning of adjacent components or trace routing adjustments.

Q2: What is the significance of the inductance difference between 7 mH and 6.8 mH?

A: The −2.9% inductance variance falls within standard tolerance specifications for common mode chokes. This level of deviation does not typically affect filtering performance in EMI suppression applications. However, designs with tight frequency response requirements should be evaluated on a case-by-case basis using circuit simulation.

Q3: Why is the DC resistance of the 7116-RC lower than the CMT-02107?

A: The 200 mOhm DCR of the 7116-RC compared to the 500 mOhm of the CMT-02107 indicates improved conductor design or wire gauge in the Bourns component. Lower DC resistance reduces I²R power dissipation and heat generation, which is beneficial for thermal performance and component longevity.

Q4: Are there any compliance or certification differences between the two parts?

A: The CMT-02107 specifications do not list RoHS or REACH compliance status. The 7116-RC is explicitly RoHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards required in most markets. Both components carry EAR99 ECCN classification.

Q5: What should be verified before implementing the 7116-RC as a substitute?

A: Verification steps include: (1) PCB layout confirmation to accommodate the 22.86 x 16.51 mm footprint and 22.86 mm height; (2) electrical simulation or bench testing to confirm that the 6.8 mH inductance meets circuit performance requirements; (3) thermal analysis to confirm that the lower DCR does not introduce unexpected impedance changes; (4) mechanical fit validation in the target assembly.