RN112-4-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN112-4-02 is a 700 µH, 2-line common mode choke manufactured by Schaffner EMC Inc., designed for power line filtering applications. This through-hole component is rated for 4A typical current with 27mOhm typical DC resistance and operates across -40°C to 125°C. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar filtering characteristics.

Substiute Parts

RN112-4-02

Schaffner EMC Inc.In Stock: 899RN112-4-02 Datasheet

Current PartRFQ

RN112-4-02-0M7

Schaffner EMC Inc.In Stock: 2498RN112-4-02-0M7 Datasheet

DirectRFQ

CMS2-11-R

Eaton - Electronics DivisionIn Stock: 2196CMS2-11-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RN112-4-02 is determined by the following critical parameters: inductance value (700 µH), number of lines (2), current rating capability, mounting type compatibility, and regulatory compliance. The substitute parts are grouped into two categories based on these criteria:

Direct Equivalent (RN112-4-02-0M7): Maintains identical inductance, line count, mounting type, and form factor. Differs in frequency measurement point (10 kHz vs. 1 kHz), lower DCR (24mOhm vs. 27mOhm), higher AC voltage rating (300V vs. 250V), and active product status with expanded temperature range support.

Similar Substitute (CMS2-11-R): Shares the same inductance value and 2-line configuration but differs fundamentally in mounting type (surface mount vs. through hole), current rating (800mA vs. 4A), and physical dimensions. This part is suitable only for applications where surface mount technology is acceptable and current requirements do not exceed 800mA.

Parameter Comparison

Engineering Selection Recommendations

RN112-4-02-0M7 is the primary direct equivalent for the obsolete RN112-4-02. Both parts are manufactured by Schaffner EMC Inc., share identical physical dimensions and mounting type, and maintain the same 700 µH inductance and 2-line configuration. The RN112-4-02-0M7 offers improved specifications with lower DCR (24mOhm vs. 27mOhm), higher AC voltage rating (300V vs. 250V), and active product status with expanded regulatory approvals (ENEC, UR, VDE). The operating temperature range is reduced to -40°C to 100°C, which may require verification for applications requiring the full -40°C to 125°C range of the original part.

CMS2-11-R is a similar substitute suitable only for applications where surface mount technology is acceptable and current requirements do not exceed 800mA. This part shares the 700 µH inductance and 2-line configuration but introduces significant differences: surface mount packaging, substantially higher DCR (230mOhm vs. 27mOhm), reduced current rating (800mA vs. 4A), and smaller physical footprint (8.90mm x 8.90mm vs. 17.70mm x 17.10mm). The CMS2-11-R offers extended operating temperature range (-40°C to 160°C) and ROHS3 compliance but lacks specified AC voltage rating and approval agency certifications.

Frequently Asked Questions (FAQ)

Q: Can RN112-4-02-0M7 be used as a direct replacement for RN112-4-02?

A: Yes, RN112-4-02-0M7 is a direct equivalent. Both parts maintain identical physical dimensions, mounting type (through hole), inductance (700 µH), line count (2), and current rating (4A). The primary consideration is the reduced operating temperature upper limit (100°C vs. 125°C) in the RN112-4-02-0M7, which must be verified against application requirements.

Q: What are the key differences between RN112-4-02-0M7 and CMS2-11-R?

A: The primary differences are mounting type (through hole vs. surface mount), current rating (4A vs. 800mA), and DC resistance (24mOhm vs. 230mOhm). CMS2-11-R is suitable only for applications with current requirements not exceeding 800mA and where surface mount technology is acceptable. The significantly higher DCR of CMS2-11-R results in greater power dissipation.

Q: Is CMS2-11-R compatible with through-hole PCB designs?

A: No. CMS2-11-R is a surface mount component with a 4-pad configuration, whereas RN112-4-02 and RN112-4-02-0M7 are through-hole components with 4-pin configurations. PCB redesign would be required to use CMS2-11-R.

Q: What is the impact of the higher DC resistance in CMS2-11-R?

A: The CMS2-11-R exhibits 230mOhm typical DCR compared to 24mOhm in RN112-4-02-0M7, representing approximately 9.6 times higher resistance. This results in significantly greater power dissipation and heat generation, making it unsuitable for applications requiring the low-loss characteristics of the original part.

Q: Are all substitute parts RoHS compliant?

A: Yes. RN112-4-02 is RoHS Compliant, while both RN112-4-02-0M7 and CMS2-11-R are ROHS3 Compliant, meeting current regulatory requirements.

Q: What regulatory approvals should be considered when selecting a substitute?

A: RN112-4-02-0M7 carries expanded approvals (ENEC, UR, VDE) compared to the original part (UR, VDE), providing broader regulatory coverage. CMS2-11-R does not specify approval agency certifications, which may be a limiting factor for applications requiring specific regulatory compliance.