CMF-0100 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMF-0100 is a 2-line common mode choke manufactured by Tamura with 10 mH inductance at 1 kHz, rated for 450 mA maximum current, and 1.36 Ohm DC resistance. This component is classified as obsolete product status. Due to its obsolete designation, equivalent substitute parts with active product status are available to maintain design continuity and ensure long-term supply chain reliability for applications requiring common mode filtering in power line environments.

Substiute Parts

CMF-0100

TamuraIn Stock: 703CMF-0100 Datasheet

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7412-RC

Bourns Inc.In Stock: 11237412-RC Datasheet

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B82730U3451A020

EPCOS - TDK ElectronicsIn Stock: 1000452B82730U3451A020 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMF-0100 are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Number of Lines: 2 (mandatory match)
• Inductance Value: 10 mH (mandatory match)
• Package / Case: Vertical, 4 PC Pin (mandatory match)
• Mounting Type: Through Hole (mandatory match)

Secondary Compatibility Parameters:

• Current Rating (Max): Equal to or greater than 450 mA
• DC Resistance (DCR): Within acceptable operating range
• Voltage Rating - AC: Equal to or greater than 250 V
• Product Status: Active (preferred for supply continuity)

Both substitute parts meet the primary matching criteria. The Bourns 7412-RC provides higher current capacity (800 mA) with lower DCR (500 mOhm). The EPCOS B82730U3451A020 maintains identical current rating (450 mA) with comparable DCR (1.75 Ohm typical) and higher voltage rating (300 V).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Electrical Equivalence):

The EPCOS B82730U3451A020 provides the closest electrical match to the CMF-0100, maintaining the same 450 mA current rating and comparable DCR of 1.75 Ohm typical. This part carries active product status with ROHS3 compliance and UR/VDE approval agency certifications, ensuring regulatory compliance and supply chain continuity.

For Enhanced Performance (Higher Current Capacity):

The Bourns 7412-RC offers superior electrical performance with 800 mA current capacity and significantly lower DCR of 500 mOhm, providing reduced power dissipation. This part is suitable for applications where the original 450 mA rating provides insufficient margin. The 7412-RC maintains active product status with ROHS3 compliance and operates across an extended temperature range of -55°C to 105°C.

Both substitute parts are through-hole mounted in vertical 4-pin configurations, ensuring mechanical compatibility with existing PCB layouts designed for the CMF-0100.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 7412-RC be used as a direct replacement for the CMF-0100?

A: Yes. The 7412-RC matches all primary criteria: 2-line configuration, 10 mH inductance at 1 kHz, vertical 4-pin through-hole package, and 250 V AC rating. The higher current rating (800 mA versus 450 mA) and lower DCR (500 mOhm versus 1.36 Ohm) represent performance enhancements rather than incompatibilities.

Q: What is the difference between the inductance measurement frequencies (1 kHz vs. 10 kHz) for the EPCOS part?

A: The EPCOS B82730U3451A020 specifies inductance at 10 kHz while the CMF-0100 specifies at 1 kHz. Both parts deliver 10 mH inductance value; the measurement frequency difference reflects manufacturer test methodology and does not affect functional substitution for common mode filtering applications.

Q: Are there any package or mounting differences between these parts?

A: All three parts use identical through-hole mounting with vertical 4-pin package configuration. Physical dimensions vary slightly (CMF-0100: 17.50mm L × 16.00mm W × 20.50mm H; 7412-RC: 19.00mm L × 17.00mm W × 21.00mm H; B82730U3451A020: 16.50mm L × 11.00mm W × 16.50mm H), but all fit standard through-hole PCB layouts designed for 4-pin vertical common mode chokes.

Q: Which substitute part should be selected for new designs?

A: For new designs, either active-status substitute part is acceptable. The EPCOS B82730U3451A020 provides direct electrical equivalence with the original CMF-0100 specifications. The Bourns 7412-RC is suitable when enhanced current capacity and lower losses are design requirements.

Q: What compliance certifications apply to the substitute parts?

A: The Bourns 7412-RC carries ROHS3 compliance. The EPCOS B82730U3451A020 carries ROHS3 compliance with additional UR and VDE approval agency certifications. Both parts are REACH unaffected and classified as EAR99 for export control purposes.