RN242-1.4-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN242-1.4-02 is a 27 mH common mode choke manufactured by Schaffner EMC Inc., designed for two-line power line filtering applications. This component features a 1.4A typical current rating, 500mOhm DC resistance, and operates across -40°C to 125°C. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing system designs and maintenance applications.

Substiute Parts

RN242-1.4-02

Schaffner EMC Inc.In Stock: 1132RN242-1.4-02 Datasheet

Current PartRFQ

RN242-1.4-02-27M

Schaffner EMC Inc.In Stock: 1495RN242-1.4-02-27M Datasheet

DirectRFQ

DFKH-31-0003

SCHURTER Inc.In Stock: 1333DFKH-31-0003 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN242-1.4-02 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Number of Lines: 2 (mandatory match)
• Current Rating: 1.4A or higher
• DC Resistance: 500mOhm or lower
• Mounting Type: Through Hole (mandatory match)
• Package / Case: Vertical, 4 PC Pin (mandatory match)
• Physical Dimensions: Compatible footprint (31.00mm x 18.00mm nominal)

Secondary Considerations:

• Inductance value at specified frequency
• AC voltage rating (must meet or exceed 250V minimum)
• Operating temperature range
• Regulatory compliance (UR, VDE certifications)

The substitute parts listed below meet the primary compatibility criteria and maintain functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

RN242-1.4-02-27M (Direct Substitute - Preferred)

This part is the direct equivalent from Schaffner EMC Inc. and maintains identical electrical specifications and physical dimensions. The part is currently in active production status with higher inventory availability (1435 Pcs). It carries expanded regulatory approvals (ENEC, UR, VDE) and meets ROHS3 compliance. The AC voltage rating is increased to 300V, providing additional margin over the original 250V specification. The operating temperature range is reduced to -40°C ~ 100°C, which is acceptable for most applications within the original -40°C ~ 125°C envelope. This substitute is the optimal choice for direct replacement in existing designs.

DFKH-31-0003 (Similar Substitute - Alternative)

This SCHURTER Inc. component meets the core functional requirements with matching 2-line configuration, 1.4A current rating, and through-hole mounting. The DC resistance is improved at 470mOhm compared to 500mOhm. The AC voltage rating of 440V exceeds the original specification. Physical dimensions are marginally larger (31.50mm x 18.50mm versus 31.00mm x 18.00mm), requiring verification of PCB layout compatibility. The operating temperature range is narrower (-25°C ~ 100°C). This part is suitable for applications where the slightly larger footprint can be accommodated and lower temperature operation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can RN242-1.4-02-27M be used as a direct replacement for RN242-1.4-02?

A: Yes. Both parts share identical physical dimensions (31.00mm x 18.00mm), package configuration (Vertical, 4 PC Pin), and core electrical specifications (27 mH inductance, 1.4A current rating, 500mOhm DCR). The RN242-1.4-02-27M is the active production equivalent with expanded certifications and improved availability.

Q: What is the difference between the inductance measurements at 1 kHz versus 10 kHz?

A: The RN242-1.4-02 specifies 27 mH @ 1 kHz, while RN242-1.4-02-27M specifies 27 mH @ 10 kHz. Both maintain the same nominal inductance value across their respective frequency references. The measurement frequency difference reflects standard industry practice for component characterization at different operating points.

Q: Is DFKH-31-0003 compatible with existing PCB layouts designed for RN242-1.4-02?

A: Partial compatibility exists. The DFKH-31-0003 maintains the same through-hole mounting type and 4-pin configuration. However, the physical dimensions are slightly larger (31.50mm x 18.50mm versus 31.00mm x 18.00mm). PCB layout verification is required to confirm adequate clearance and spacing before implementation.

Q: What are the regulatory compliance differences between the substitute parts?

A: RN242-1.4-02-27M carries ENEC, UR, and VDE approvals with ROHS3 compliance. DFKH-31-0003 carries ROHS3 compliance with no specified approval agencies listed. For applications requiring specific regulatory certifications, RN242-1.4-02-27M is the appropriate choice.

Q: Can either substitute part operate at the full -40°C ~ 125°C temperature range of the original?

A: No. RN242-1.4-02-27M operates to -40°C ~ 100°C, and DFKH-31-0003 operates to -25°C ~ 100°C. Both have reduced upper temperature limits compared to the original 125°C specification. Applications requiring operation above 100°C require alternative component selection.

Q: What is the voltage rating consideration for substitution?

A: The original RN242-1.4-02 is rated for 250V AC. RN242-1.4-02-27M provides 300V AC rating, and DFKH-31-0003 provides 440V AC rating. Both substitutes exceed the original voltage specification, providing additional safety margin in power line filtering applications.