CMT-8108 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMT-8108 is a 1 mH, 2-line common mode choke manufactured by Triad Magnetics, designed for power line filtering applications. This through-hole component operates at 10A maximum current with 10mOhm DC resistance and withstands 1500V AC voltage. The part is actively produced and widely used in EMI/RFI suppression circuits for two-conductor power distribution systems.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across different manufacturers while preserving circuit functionality and design specifications.

Substiute Parts

CMT-8108

Triad MagneticsIn Stock: 1044CMT-8108 Datasheet

Current PartRFQ

8108-RC

Bourns Inc.In Stock: 38908108-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMT-8108 are qualified based on the following criteria:

Electrical Parameters (Critical Match Required):

• Inductance value: 1 mH @ 1 kHz
• Number of lines: 2-line configuration
• Current rating: 10A maximum
• DC resistance: 10mOhm maximum
• AC voltage rating: 1500V minimum

Mechanical Parameters (Exact Match Required):

• Mounting type: Through Hole
• Physical dimensions: 1.200" L x 0.600" W (30.48mm x 15.24mm)
• Package configuration: Vertical, 4 PC Pin
• Height: 1.200" (30.48mm) maximum

Compliance Parameters (Equivalent or Better):

• RoHS3 compliance status
• Operating temperature range: -55°C to 105°C minimum
• REACH compliance status

Substitute parts must satisfy all three parameter categories simultaneously. Deviations in any critical electrical or mechanical parameter disqualify a part from substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

CMT-8108 (Triad Magnetics) - Primary Selection

The CMT-8108 is the original specified component with active product status. It carries full regulatory approvals including CSA, IEC, UL, and VDE certifications. This part is recommended for new designs and applications where the original manufacturer specification must be maintained. Current inventory of 990 pieces supports immediate procurement.

8108-RC (Bourns Inc.) - Qualified Substitute

The Bourns 8108-RC is a direct electrical and mechanical equivalent to the CMT-8108. All critical parameters match exactly: 1 mH inductance, 10A current rating, 10mOhm DCR, identical physical dimensions, and through-hole mounting configuration. Both parts operate across the -55°C to 105°C temperature range and maintain ROHS3 compliance. The 8108-RC is suitable for direct substitution in existing designs or as an alternative source for new applications. Higher inventory availability (3858 pieces) may provide supply chain advantages.

Substitution Eligibility Summary

The 8108-RC qualifies as a direct substitute based on:

• Identical electrical performance specifications
• Matching mechanical form factor and pin configuration
• Equivalent environmental operating range
• Equivalent regulatory compliance status
• Same package classification and mounting method

No derating or circuit modification is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can the 8108-RC replace the CMT-8108 in existing circuit designs?

A: Yes. The 8108-RC is electrically and mechanically equivalent. All critical parameters including inductance, current rating, DC resistance, voltage rating, operating temperature, and physical dimensions are identical. Direct substitution is possible without circuit modification.

Q: Are there differences in regulatory approvals between these parts?

A: The CMT-8108 carries explicit approvals from CSA, IEC, UL, and VDE. The 8108-RC approval agency information is not specified in the provided data. Both parts are ROHS3 compliant and REACH unaffected. Verify specific approval requirements for your application before substitution.

Q: Do these parts have the same pin configuration?

A: Yes. Both the CMT-8108 and 8108-RC use a vertical, 4 PC pin package configuration with identical physical dimensions of 1.200" L x 0.600" W (30.48mm x 15.24mm). PCB footprints are interchangeable.

Q: What is the difference in moisture sensitivity between these parts?

A: The CMT-8108 has moisture sensitivity level listed as Not Applicable. The 8108-RC is rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. This represents an equivalent or improved condition for the substitute part.

Q: Can I use these parts interchangeably in high-voltage applications?

A: Both parts are rated for 1500V AC operation. The CMT-8108 explicitly specifies this voltage rating. The 8108-RC voltage rating information is not provided in the available data. Confirm AC voltage rating specifications for the 8108-RC before use in applications requiring 1500V dielectric strength.

Q: What is the maximum current these parts can handle?

A: Both the CMT-8108 and 8108-RC are rated for 10A maximum current with 10mOhm DC resistance. Do not exceed this current rating in circuit design.

Q: Are these parts suitable for through-hole PCB assembly?

A: Yes. Both parts are through-hole mounted components with vertical pin orientation. They are compatible with standard through-hole soldering processes and PCB assembly equipment.