Bourns 8118 Common Mode Choke - Equivalent & Substitute Parts

Part Overview

The Bourns 8118 is a 7.3 mH, 2-line common mode choke designed for through-hole mounting with a maximum current rating of 9.3A and DC resistance of 32mOhm. The main part number 8118 is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Alternative part numbers and manufacturers provide equivalent electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

8118

Bourns Inc.In Stock: 9168118 Datasheet

Current PartRFQ

8118-RC

Bourns Inc.In Stock: 12058118-RC Datasheet

DirectRFQ

CMT-8118

Triad MagneticsIn Stock: 3088CMT-8118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Bourns 8118 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 7.3 mH @ 1 kHz
• Number of lines: 2
• Current rating: 9.3A maximum
• DC resistance: 32mOhm maximum
• Operating temperature range: -55°C ~ 105°C
• Mounting type: Through hole
• Physical dimensions: 1.650" L x 0.800" W (41.91mm x 20.32mm)
• Package configuration: Vertical, 4 PC pin

Direct Substitute (Bourns 8118-RC): Identical electrical and mechanical specifications with improved product status and RoHS3 compliance.

Similar Substitute (Triad Magnetics CMT-8118): Matches all critical electrical parameters and physical dimensions. Manufactured by alternative supplier with active product status, RoHS3 compliance, and additional voltage rating specification (1500V AC).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: The Bourns 8118-RC is the primary substitute for the obsolete 8118. It maintains identical electrical and mechanical specifications while offering active product status and RoHS3 compliance. This part is suitable for designs requiring Bourns manufacturer continuity.

For Alternative Sourcing: The Triad Magnetics CMT-8118 provides equivalent electrical performance with active product status and RoHS3 compliance. This part includes additional certifications (CSA, IEC, UL, VDE) and specifies AC voltage rating (1500V), making it suitable for applications requiring enhanced regulatory documentation. Physical and electrical parameters are fully compatible with the original 8118 specification.

Compliance Consideration: Both substitute parts meet RoHS3 requirements, addressing the non-compliance status of the original 8118. Selection between direct and alternative substitutes depends on manufacturer preference and regulatory certification requirements for the end application.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 8118-RC be used as a direct replacement for the 8118? A: Yes. The 8118-RC maintains identical inductance (7.3 mH @ 1 kHz), current rating (9.3A), DC resistance (32mOhm), operating temperature range (-55°C ~ 105°C), and physical dimensions (1.650" L x 0.800" W). It is a direct electrical and mechanical equivalent with improved product status and compliance.

Q: What are the key differences between the Bourns 8118-RC and Triad Magnetics CMT-8118? A: Both parts match all critical electrical parameters and physical dimensions. The CMT-8118 differs in manufacturer, includes additional regulatory certifications (CSA, IEC, UL, VDE), and specifies AC voltage rating (1500V). The 8118-RC maintains Bourns manufacturer continuity.

Q: Are there packaging differences between these parts? A: The Bourns 8118 is supplied in standard packaging, the 8118-RC in bulk packaging, and the CMT-8118 in bulk packaging. All three use identical through-hole, vertical 4-pin package configuration suitable for PCB assembly.

Q: Does the CMT-8118 AC voltage rating affect compatibility? A: The CMT-8118 specifies 1500V AC rating, which is an additional parameter not specified in the original 8118. This does not affect compatibility; it indicates the CMT-8118 is rated for higher AC voltage stress, making it suitable for applications requiring this specification.

Q: What is the RoHS compliance status of these parts? A: The original Bourns 8118 is RoHS non-compliant. Both substitutes—Bourns 8118-RC and Triad Magnetics CMT-8118—are RoHS3 compliant, meeting current environmental regulations.