Bourns 7109 Common Mode Choke - Equivalent & Substitute Parts

Part Overview

The Bourns 7109 is a 3 mH @ 1 kHz, 2-line common mode choke designed for through-hole mounting with a maximum current rating of 2A and 75mOhm DC resistance. This component is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and procurement planning. The 7109 operates across a temperature range of -55°C to 105°C and is packaged in a vertical configuration with 2 PC pins.

Substiute Parts

7109

Bourns Inc.In Stock: 11547109 Datasheet

Current PartRFQ

7109-RC

Bourns Inc.In Stock: 27667109-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 7109-RC qualifies as a direct substitute based on the following allowed electrical and mechanical parameters:

• Number of Lines: Both parts maintain 2-line configuration
• Current Rating: Both rated at 2A maximum
• DC Resistance: Both specified at 75mOhm maximum
• Mounting Type: Both are through-hole mounted
• Operating Temperature Range: Both operate -55°C to 105°C
• Moisture Sensitivity Level: Both rated MSL 1 (Unlimited)

The 7109-RC represents an active product status alternative to the obsolete 7109, with improved RoHS3 compliance and updated packaging specifications.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 7109-RC is the designated substitute for the obsolete Bourns 7109. Selection of the 7109-RC is supported by:

• Active product status ensuring continued availability and supply chain support
• ROHS3 compliance meeting current regulatory requirements, compared to the non-compliant 7109
• Maintained electrical specifications across current rating, DC resistance, and operating temperature range
• Identical 2-line common mode choke configuration and through-hole mounting methodology

Physical dimension differences (0.600" Dia x 0.450" W versus 0.700" Dia x 0.550" W) and pin count variation (2 PC Pin versus 4 PC Pin) require PCB layout verification prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the 7109-RC directly replace the 7109 in existing designs?

A: The 7109-RC maintains equivalent electrical performance in current rating, DC resistance, and operating temperature. However, the increased physical dimensions and pin count change require PCB footprint and layout verification before substitution.

Q: What is the inductance difference between these parts?

A: The 7109 is specified at 3 mH @ 1 kHz, while the 7109-RC is specified at 2.55 mH @ 1 kHz. This 0.45 mH difference must be evaluated against circuit requirements.

Q: Why is RoHS compliance status different?

A: The 7109 is RoHS non-compliant, while the 7109-RC is ROHS3 compliant. This reflects the obsolete versus active product status and updated manufacturing standards.

Q: Are there packaging differences between these parts?

A: Yes. The 7109 uses a 2 PC pin vertical package, while the 7109-RC uses a 4 PC pin vertical package. Physical dimensions also differ: 7109 is 0.600" Dia x 0.450" W, and 7109-RC is 0.700" Dia x 0.550" W with a 0.700" maximum height.

Q: What is the moisture sensitivity rating for both parts?

A: Both the 7109 and 7109-RC are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.