CMT-02302 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMT-02302 is a 2 mH common mode choke manufactured by Tamura, designed for two-line filtering applications in through-hole configurations. This component features a 3A maximum current rating and 100 mOhm DC resistance, with AC voltage rating of 250V. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

Substiute Parts

CMT-02302

TamuraIn Stock: 783CMT-02302 Datasheet

Current PartRFQ

7118-RC

Bourns Inc.In Stock: 10277118-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMT-02302 common mode choke is determined by the following critical parameters:

Primary Compatibility Criteria:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be Through Hole
• Package / Case: Must be Vertical, No Base, 4 PC Pin configuration
• Inductance Range: 1.7 mH to 2 mH @ 1 kHz (within acceptable filtering tolerance)
• Current Rating: Must equal or exceed 3A maximum requirement
• DC Resistance: Lower or equal to 100 mOhm preferred for thermal performance

Secondary Considerations:

• Voltage Rating - AC: Must support minimum 250V AC
• Moisture Sensitivity: MSL 1 classification acceptable
• Product Status: Active status preferred for long-term availability

The Bourns 7118-RC meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

For CMT-02302 Replacement:

The Bourns 7118-RC serves as a direct functional substitute for the obsolete Tamura CMT-02302. Both components share identical mechanical configurations (through-hole, vertical mounting, 4-pin package) and electrical line architecture (2-line common mode choke).

The 7118-RC provides superior electrical performance characteristics: 5A current rating exceeds the 3A requirement of the original part, and 40 mOhm DC resistance is significantly lower than the 100 mOhm specification, resulting in reduced power dissipation. The 1.7 mH inductance at 1 kHz represents a 15% reduction from the original 2 mH specification, which remains within acceptable tolerance for common mode filtering applications in this category.

The 7118-RC holds active product status with ROHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory alignment. Operating temperature range of -55°C to 105°C provides extended environmental performance compared to the unspecified range of the original component.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 7118-RC directly replace the Tamura CMT-02302 in existing PCB designs?

A: Yes. Both components share identical through-hole mounting configurations, vertical orientation, and 4-pin package specifications. No PCB layout modifications are required for mechanical compatibility.

Q: What is the significance of the 1.7 mH versus 2 mH inductance difference?

A: The 1.7 mH inductance of the 7118-RC represents a 15% reduction from the original 2 mH specification. For common mode choke applications, this variance remains within acceptable filtering tolerance ranges. System-level EMI performance validation is recommended if inductance tolerance is critical to circuit function.

Q: Does the lower DC resistance of the 7118-RC affect circuit operation?

A: The 40 mOhm DCR of the 7118-RC is lower than the 100 mOhm specification of the CMT-02302. Lower DC resistance reduces power dissipation and heat generation, providing improved thermal performance. This change is beneficial and does not negatively impact circuit operation.

Q: Is the 5A current rating of the 7118-RC compatible with the 3A design requirement?

A: Yes. The 7118-RC 5A rating exceeds the 3A maximum current requirement of the original design. The component operates safely within design specifications with additional current margin.

Q: What compliance certifications apply to the substitute part?

A: The Bourns 7118-RC is ROHS3 compliant and REACH unaffected. Both certifications align with current regulatory requirements for electronic components in industrial and commercial applications.

Q: Are there packaging differences between the original and substitute parts?

A: Both components are supplied in through-hole vertical configurations with 4-pin packages. The CMT-02302 is supplied in bulk packaging, while the 7118-RC is also supplied in bulk. No packaging format changes affect component installation or handling procedures.