CMT-8109 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMT-8109 is a 30 mH 2-line common mode choke manufactured by Triad Magnetics, designed for power line filtering applications. This through-hole component operates at 2.3A maximum current with 330mOhm DC resistance and is rated for 1500V AC operation across an extended temperature range of -55°C to 105°C. The part maintains Active product status and holds multiple international approvals including CSA, IEC, UL, and VDE certifications. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and compliance requirements to ensure direct functional interchangeability in circuit applications.

Substiute Parts

CMT-8109

Triad MagneticsIn Stock: 841CMT-8109 Datasheet

Current PartRFQ

CMT-8109-B

Triad MagneticsIn Stock: 1000CMT-8109-B Datasheet

DirectRFQ

8109-RC

Bourns Inc.In Stock: 10478109-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMT-8109 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Equivalent (CMT-8109-B): This Triad Magnetics part maintains identical specifications across all critical parameters including inductance, current rating, DC resistance, AC voltage rating, operating temperature range, physical dimensions, and package configuration. The part shares the same series designation (CMT) and approval certifications. This classification indicates complete functional interchangeability with no design modifications required.

Similar Substitute (8109-RC): This Bourns Inc. part matches the core electrical specifications (30 mH inductance, 2.3A current rating, 330mOhm DCR) and mechanical dimensions (1.350" x 0.800" x 1.450" height, Vertical 4 PC Pin package). Operating temperature range and RoHS3 compliance are identical. However, AC voltage rating and approval agency certifications are not specified in the provided data for this part. The base product number designation (8109) indicates design compatibility within the 8100 series.

Substitution eligibility is determined by matching: inductance value and frequency, number of lines, current rating, DC resistance, physical dimensions, mounting type, package configuration, and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

CMT-8109-B Selection: This part is the primary equivalent choice for direct replacement of CMT-8109. Both parts are manufactured by Triad Magnetics, maintain identical electrical and mechanical specifications, and carry the same international approvals (CSA, IEC, UL, VDE). Selection of CMT-8109-B requires no circuit redesign or validation testing. Current inventory availability is 977 pieces.

8109-RC Selection: This Bourns Inc. part provides functional substitution based on matching inductance, current rating, DC resistance, physical dimensions, and operating temperature range. The part is ROHS3 compliant and maintains Active product status. AC voltage rating specification is not provided in the available data. Selection of 8109-RC as a substitute should be evaluated against specific application voltage requirements. Current inventory availability is 963 pieces.

Compliance Considerations: All three parts are ROHS3 compliant and REACH unaffected. CMT-8109 and CMT-8109-B carry documented approval certifications from CSA, IEC, UL, and VDE. The 8109-RC part does not list approval agency certifications in the provided data. Applications requiring specific regulatory approvals should prioritize CMT-8109 or CMT-8109-B.

Frequently Asked Questions (FAQ)

Q: Can CMT-8109-B be used as a direct replacement for CMT-8109 without any modifications?

A: Yes. CMT-8109-B is a direct equivalent with identical inductance (30 mH @ 1 kHz), current rating (2.3A), DC resistance (330mOhm), AC voltage rating (1500V), operating temperature range (-55°C to 105°C), physical dimensions (1.350" x 0.800" x 1.450"), and package configuration (Vertical, 4 PC Pin). No circuit modifications or design changes are required.

Q: What are the key differences between CMT-8109 and 8109-RC?

A: Both parts share identical inductance, current rating, DC resistance, physical dimensions, and operating temperature specifications. The primary differences are manufacturer (Triad Magnetics vs. Bourns Inc.) and documented approval certifications. AC voltage rating is specified as 1500V for CMT-8109 but is not provided for 8109-RC in the available data.

Q: Is the 8109-RC suitable for applications requiring UL, CSA, IEC, or VDE certification?

A: The provided data does not list approval agency certifications for 8109-RC. Applications with specific regulatory certification requirements should use CMT-8109 or CMT-8109-B, both of which carry CSA, IEC, UL, and VDE approvals.

Q: Are all three parts RoHS compliant?

A: Yes. CMT-8109, CMT-8109-B, and 8109-RC are all ROHS3 compliant and REACH unaffected.

Q: Do the physical dimensions match exactly across all three parts?

A: Yes. All three parts share identical dimensions: 1.350" length x 0.800" width (34.29mm x 20.32mm) with maximum height of 1.450" (36.83mm). All use Vertical, 4 PC Pin package configuration and are through-hole mounted components.

Q: What is the operating temperature range for these parts?

A: All three parts operate across the same temperature range: -55°C to 105°C.

Q: Can these parts be used interchangeably in the same PCB layout?

A: Yes. All three parts maintain identical through-hole mounting type, physical dimensions, and 4-pin vertical package configuration, allowing direct PCB layout compatibility without modification.