CMT4-5-R Equivalent & Substitute Parts

Part Overview

The CMT4-5-R is a 2-line common mode choke manufactured by Eaton - Electronics Division, designed for power line filtering applications. This component features 920 µH inductance at 10 kHz with a 5A current rating and 21 mOhm typical DC resistance. The part is mounted through-hole with vertical 4-pin configuration and operates across -40°C to 125°C.

The CMT4-5-R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

CMT4-5-R

Eaton - Electronics DivisionIn Stock: 781CMT4-5-R Datasheet

Current PartRFQ

8108-RC

Bourns Inc.In Stock: 38908108-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMT4-5-R is determined by the following critical parameters:

Primary Compatibility Criteria:

• Functional Type: 2-line common mode choke for power line filtering
• Mounting Configuration: Through-hole vertical 4-pin package
• Electrical Performance: Inductance value, current rating, and DC resistance within acceptable operating margins
• Environmental Specifications: Operating temperature range and moisture sensitivity classification

Substitution Logic:

The Bourns 8108-RC qualifies as a substitute based on matching the core functional requirements: both components are 2-line common mode chokes with through-hole vertical 4-pin mounting suitable for power line applications. Both maintain MSL 1 (Unlimited) moisture sensitivity classification.

Electrical parameter differences exist: the 8108-RC provides higher inductance (1 mH @ 1 kHz versus 920 µH @ 10 kHz), higher current capacity (10A versus 5A), and lower DC resistance (10 mOhm versus 21 mOhm). These differences represent performance enhancements rather than incompatibilities. The 8108-RC's wider operating temperature range (-55°C to 105°C) encompasses the CMT4-5-R specification, with the exception of the upper temperature limit (105°C versus 125°C).

Physical dimensions differ slightly; the 8108-RC is marginally larger. PCB layout verification is required to confirm mechanical fit within the target application.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration:

The CMT4-5-R is obsolete, making the active-status 8108-RC the appropriate substitute for new designs, production continuity, or system maintenance where component replacement is necessary.

Compliance and Certification:

The 8108-RC carries ROHS3 compliance certification, whereas the CMT4-5-R compliance status is not specified. Both components are classified as EAR99 for export control purposes and maintain MSL 1 moisture sensitivity rating.

Electrical Performance:

The 8108-RC exceeds the CMT4-5-R specifications in current capacity (10A versus 5A) and provides lower DC resistance (10 mOhm versus 21 mOhm). These characteristics represent performance improvements suitable for applications originally designed for the CMT4-5-R.

Temperature Range Limitation:

The 8108-RC upper operating temperature limit (105°C) is 20°C below the CMT4-5-R specification (125°C). Applications requiring sustained operation above 105°C require alternative evaluation.

Physical Fit Verification:

The 8108-RC dimensions (30.48 × 15.24 × 30.48 mm) exceed the CMT4-5-R footprint (25.00 × 15.40 × 25.50 mm). PCB layout and enclosure clearance must be confirmed before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 8108-RC directly replace the CMT4-5-R in existing designs?

A: The 8108-RC is functionally compatible as a 2-line common mode choke with matching through-hole vertical 4-pin configuration. However, physical dimensions are larger, requiring PCB layout verification. The upper operating temperature limit (105°C) is lower than the CMT4-5-R (125°C); applications requiring operation above 105°C require alternative evaluation.

Q: What are the key electrical differences between these components?

A: The 8108-RC provides higher inductance (1 mH @ 1 kHz versus 920 µH @ 10 kHz), higher current rating (10A versus 5A), and lower DC resistance (10 mOhm versus 21 mOhm). These represent performance enhancements for most power line filtering applications.

Q: Are both components suitable for the same power line filtering applications?

A: Both components are classified for power line filtering with 2-line common mode choke functionality. The 8108-RC's enhanced electrical specifications make it suitable for applications originally designed for the CMT4-5-R, provided temperature and physical fit requirements are satisfied.

Q: What is the significance of the MSL 1 rating for both components?

A: MSL 1 (Unlimited) indicates both components have unlimited shelf life and require no special moisture control during storage or handling, simplifying supply chain management and component procurement.

Q: Why is the CMT4-5-R obsolete?

A: The CMT4-5-R is classified as obsolete by Eaton - Electronics Division. The 8108-RC from Bourns Inc. is an active-status alternative suitable for design transitions and production continuity.

Q: Should I consider the frequency difference (10 kHz versus 1 kHz) when selecting a substitute?

A: Inductance values are frequency-dependent. The CMT4-5-R is specified at 10 kHz, while the 8108-RC is specified at 1 kHz. Application-specific frequency response requirements must be evaluated to ensure the substitute meets filtering performance criteria.