Bourns 8108 Common Mode Choke - Equivalent & Substitute Parts

Part Overview

The Bourns 8108 is a 1 mH, 2-line common mode choke designed for through-hole mounting with a 10A current rating and 10mOhm maximum DC resistance. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 8108 operates across a temperature range of -55°C to 105°C and is packaged in a vertical, 4-pin configuration with dimensions of 1.200" L x 0.600" W (30.48mm x 15.24mm).

Substiute Parts

8108

Bourns Inc.In Stock: 9508108 Datasheet

Current PartRFQ

8108-RC

Bourns Inc.In Stock: 38908108-RC Datasheet

DirectRFQ

CMT-8108

Triad MagneticsIn Stock: 1044CMT-8108 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Bourns 8108 are qualified based on the following electrical and mechanical parameters:

• Inductance value: 1 mH @ 1 kHz
• Number of lines: 2
• Current rating: 10A maximum
• DC resistance: 10mOhm maximum
• Operating temperature range: -55°C to 105°C
• Mounting type: Through hole
• Physical dimensions: 1.200" L x 0.600" W (30.48mm x 15.24mm)
• Package configuration: Vertical, 4-pin

The substitute parts listed below maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications requiring common mode filtering at the specified inductance and current levels.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete Bourns 8108, the Bourns 8108-RC is the primary substitute. Both parts are manufactured by Bourns Inc. and maintain identical electrical and mechanical specifications. The 8108-RC is actively produced and available in bulk packaging, providing supply continuity for production environments.

The Triad Magnetics CMT-8108 serves as an alternative substitute, meeting all core electrical and mechanical requirements. This part carries active product status and includes additional regulatory approvals from CSA, IEC, UL, and VDE. The CMT-8108 specifies an AC voltage rating of 1500V (1.5kV), which is not documented for the original 8108 or 8108-RC.

Both substitute parts are ROHS3 compliant, addressing the RoHS non-compliance status of the original 8108. Selection between the Bourns 8108-RC and Triad Magnetics CMT-8108 should be based on supply availability, regulatory certification requirements, and voltage rating specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 8108-RC be used as a direct replacement for the Bourns 8108?

A: Yes. The 8108-RC maintains identical inductance (1 mH @ 1 kHz), current rating (10A), DC resistance (10mOhm), operating temperature range (-55°C to 105°C), and physical dimensions (1.200" L x 0.600" W). The primary difference is product status: the 8108 is obsolete while the 8108-RC is actively produced. The 8108-RC also provides ROHS3 compliance.

Q: What are the key differences between the Bourns 8108-RC and Triad Magnetics CMT-8108?

A: Both parts match the core electrical specifications: 1 mH inductance, 2-line configuration, 10A current rating, and 10mOhm DCR. The CMT-8108 includes an AC voltage rating of 1500V (1.5kV) and carries approvals from CSA, IEC, UL, and VDE. The 8108-RC is a Bourns product with identical physical dimensions and thermal characteristics.

Q: Are there packaging differences between these substitute parts?

A: The Bourns 8108 is packaged in standard tape and reel format. The Bourns 8108-RC is available in bulk packaging. The Triad Magnetics CMT-8108 is also supplied in bulk packaging. All three parts use the same vertical, 4-pin through-hole package configuration.

Q: Do these substitute parts require any PCB layout modifications?

A: No. All substitute parts maintain the identical physical dimensions (1.200" L x 0.600" W, 30.48mm x 15.24mm height) and through-hole pin configuration, ensuring direct PCB compatibility without layout changes.

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

A: For new designs, either the Bourns 8108-RC or Triad Magnetics CMT-8108 is appropriate. Selection depends on supply chain preferences, regulatory certification requirements, and whether the 1500V AC voltage rating of the CMT-8108 is required for the application.