Bourns 8112 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The Bourns 8112 is a through-hole mounted common mode choke with 8 mH inductance at 1 kHz, rated for 5.6A maximum current, and 55 mOhm DC resistance. This component is designed for two-line filtering applications in power distribution and signal integrity circuits.

The 8112 is classified as obsolete. Locating active production alternatives is necessary to ensure supply chain continuity and access to current manufacturing stock.

Key Parameters

Parameter	Value
Inductance @ Frequency	8 mH @ 1 kHz
Number of Lines	2
Current Rating (Max)	5.6A
DC Resistance (Max)	55 mOhm
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	Vertical, 4 PC Pin
Size / Dimension	1.350" L x 0.800" W (34.29mm x 20.32mm)
Height (Max)	1.450" (36.83mm)

Substitute Part Grouping Explanation

Substitute parts for the Bourns 8112 are qualified based on the following electrical and mechanical parameters:

Inductance value: 8 mH @ 1 kHz
Number of lines: 2
Current rating: 5.6A minimum
DC resistance: 55 mOhm maximum
Operating temperature range: -55°C ~ 105°C minimum
Mounting type: Through Hole
Physical footprint: 1.350" L x 0.800" W, 1.450" height maximum
Package configuration: Vertical, 4 PC Pin

Two substitute parts meet these criteria:

Direct Substitute (Bourns 8112-RC): Identical electrical specifications and physical dimensions. Active product status with RoHS3 compliance.

Cross-Manufacturer Substitute (Triad Magnetics CMT-8112): Matches all core electrical parameters and physical dimensions. Adds AC voltage rating (1500V) and multiple approval certifications (CSA, IEC, UL, VDE). Active product status with RoHS3 compliance.

Parameter Comparison

Parameter	Bourns 8112 (Main)	Bourns 8112-RC (Direct)	Triad Magnetics CMT-8112 (Cross)
Manufacturer	Bourns Inc.	Bourns Inc.	Triad Magnetics
Product Status	Obsolete	Active	Active
Inductance @ Frequency	8 mH @ 1 kHz	8 mH @ 1 kHz	8 mH @ 1 kHz
Number of Lines	2	2	2
Current Rating (Max)	5.6A	5.6A	5.6A
DC Resistance (Max)	55 mOhm	55 mOhm	55 mOhm
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Voltage Rating - AC	Not specified	Not specified	1500V (1.5kV)
Mounting Type	Through Hole	Through Hole	Through Hole
Size / Dimension	1.350" L x 0.800" W (34.29mm x 20.32mm)	1.350" L x 0.800" W (34.29mm x 20.32mm)	1.350" L x 0.800" W (34.29mm x 20.32mm)
Height (Max)	1.450" (36.83mm)	1.450" (36.83mm)	1.450" (36.83mm)
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
Approval Certifications	Not specified	Not specified	CSA, IEC, UL, VDE

Engineering Selection Recommendations

For direct replacement with identical manufacturer: Select Bourns 8112-RC. This part maintains the same electrical and mechanical specifications as the obsolete 8112 while offering active product status and RoHS3 compliance. Packaging is available in bulk format.

For cross-manufacturer substitution with enhanced compliance: Select Triad Magnetics CMT-8112. This part meets all electrical and mechanical requirements of the 8112 while providing RoHS3 compliance, multiple international certifications (CSA, IEC, UL, VDE), and an AC voltage rating specification of 1500V. Active product status ensures ongoing availability.

Both substitute parts are pin-compatible and footprint-compatible with the original 8112 design.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 8112-RC be used as a direct replacement for the obsolete 8112?

A: Yes. The 8112-RC maintains identical inductance (8 mH @ 1 kHz), current rating (5.6A), DC resistance (55 mOhm), operating temperature range (-55°C ~ 105°C), and physical dimensions (1.350" L x 0.800" W, 1.450" height). Pin configuration and mounting type are identical. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What are the key differences between the Bourns 8112-RC and Triad Magnetics CMT-8112?

A: Both parts share identical electrical specifications and physical footprints. The CMT-8112 provides additional AC voltage rating specification (1500V) and multiple international certifications (CSA, IEC, UL, VDE). The 8112-RC is the same manufacturer as the original part, while the CMT-8112 is a cross-manufacturer equivalent.

Q: Are the substitute parts pin-compatible with the original 8112?

A: Yes. Both the 8112-RC and CMT-8112 use the same vertical, 4 PC pin configuration and identical physical dimensions, ensuring direct PCB compatibility.

Q: Does the AC voltage rating on the CMT-8112 affect substitution suitability?

A: The AC voltage rating on the CMT-8112 is an additional specification not present on the original 8112. This does not prevent substitution; it indicates the CMT-8112 has been characterized for AC voltage applications. Applications requiring AC voltage isolation should reference the 1500V specification.

Q: What is the difference in packaging between the 8112-RC and CMT-8112?

A: Both parts are supplied in bulk packaging. Packaging format does not affect electrical or mechanical compatibility.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the Bourns 8112-RC and Triad Magnetics CMT-8112 are RoHS3 compliant. The original 8112 is RoHS non-compliant.

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