RN122-4-02-1 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN122-4-02-1 is a common mode choke manufactured by Schaffner EMC Inc., rated for 3.3 mH inductance at 4A current capacity. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified parameter ranges while meeting current manufacturing and compliance standards.

Substiute Parts

RN122-4-02-1

Schaffner EMC Inc.In Stock: 789RN122-4-02-1 Datasheet

Current PartRFQ

RN122-4-02-1M8

Schaffner EMC Inc.In Stock: 1005RN122-4-02-1M8 Datasheet

DirectRFQ

744824433

Würth ElektronikIn Stock: 1169744824433 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RN122-4-02-1 are identified based on the following critical parameters:

• Current Rating: 4A maximum
• Mounting Type: Through Hole configuration
• Filter Type: Power Line common mode choke
• Compliance: RoHS and REACH status alignment
• Regulatory Classification: ECCN EAR99

Two substitute parts meet these criteria with variations in inductance value and physical dimensions. The RN122-4-02-1M8 maintains manufacturer continuity within the Schaffner RN series, while the 744824433 from Würth Elektronik provides an alternative source with matching current capacity and through-hole mounting.

Parameter Comparison

Engineering Selection Recommendations

The RN122-4-02-1M8 is the primary substitute, offering active product status within the same manufacturer series and maintaining full compliance with RoHS3 and REACH requirements. This part provides continuity with the original design intent while ensuring long-term availability.

The 744824433 from Würth Elektronik serves as a secondary alternative, matching the original 3.3 mH inductance specification and current rating. This part is suitable for applications where inductance value is a critical design parameter. The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin compared to the RN122-4-02-1M8.

Both substitutes maintain the 4A current rating, through-hole mounting configuration, and regulatory compliance required for power line common mode choke applications. Selection between these options depends on specific inductance requirements and physical space constraints within the target application.

Frequently Asked Questions (FAQ)

Q: Can the RN122-4-02-1M8 replace the RN122-4-02-1 directly?

A: The RN122-4-02-1M8 is electrically compatible for applications requiring 1.8 mH inductance at 4A. Physical dimensions differ (22.50mm L x 21.50mm W x 14.60mm H for horizontal mounting), requiring verification of PCB layout compatibility. Both parts share identical current rating, mounting type, and compliance status.

Q: What is the inductance difference between substitutes?

A: The RN122-4-02-1M8 provides 1.8 mH @ 10 kHz, while the 744824433 provides 3.3 mH @ 10 kHz. The 744824433 matches the original part's inductance specification. Selection depends on circuit design requirements for filtering characteristics.

Q: Are there packaging differences between the substitutes?

A: Yes. The RN122-4-02-1M8 uses horizontal 4-pin configuration (Tube packaging), while the 744824433 uses vertical 4-pin configuration (Bulk packaging). Physical footprints differ: 22.50mm x 21.50mm x 14.60mm (horizontal) versus 27.50mm x 18.50mm x 33.00mm (vertical). PCB layout must accommodate the selected mounting orientation.

Q: Do both substitutes meet the same compliance standards?

A: Both substitutes are ROHS3 compliant and REACH unaffected. The RN122-4-02-1M8 maintains MSL 1 (Unlimited) rating identical to the original part. The 744824433 lists MSL as Not Applicable. Both carry EAR99 ECCN classification.

Q: What is the DC resistance difference?

A: The RN122-4-02-1M8 has 42 mOhm typical DCR, while the 744824433 has 35 mOhm DCR. Lower DCR in the 744824433 results in reduced power dissipation for equivalent current levels.