RN122-3-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN122-3-02 is a 4.5 mH common mode choke designed for two-line power line filtering applications with a 3A typical current rating. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part features through-hole mounting, horizontal pin configuration, and compliance with UR and VDE approval standards.

Substiute Parts

RN122-3-02

Schaffner EMC Inc.In Stock: 1147RN122-3-02 Datasheet

Current PartRFQ

RN122-3-02-4M5

Schaffner EMC Inc.In Stock: 1163RN122-3-02-4M5 Datasheet

DirectRFQ

LF2420NP-452

Sumida America Components Inc.In Stock: 1012LF2420NP-452 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN122-3-02 is determined by the following critical parameters: inductance value (4.5 mH), number of lines (2-line configuration), mounting type (through-hole), and pin configuration (4 PC Pin). Current rating, DC resistance, voltage rating, and operating temperature range define functional compatibility within application constraints.

Two substitute categories are identified:

Direct Equivalent: RN122-3-02-4M5 maintains the same inductance, line count, mounting type, and pin configuration while offering active product status and enhanced specifications.

Similar Substitute: LF2420NP-452 provides matching inductance and line count with through-hole mounting but differs in current rating, DC resistance, pin orientation, and manufacturer.

Parameter Comparison

Engineering Selection Recommendations

RN122-3-02-4M5 is the primary direct equivalent. It maintains identical inductance, line configuration, and mounting specifications while offering active product status and improved compliance certifications (ENEC, UR, VDE). The inductance measurement frequency differs (10 kHz vs. 1 kHz), and the operating temperature maximum is reduced to 100°C. DC resistance is marginally lower at 80 mOhm. AC voltage rating increases to 300V. This part is suitable for direct replacement in applications where the reduced temperature range and higher measurement frequency are acceptable.

LF2420NP-452 provides an alternative with matching inductance and line count. However, the current rating is reduced to 1.5A (50% of the original), and DC resistance increases to 210 mOhm (2.5× higher). Pin orientation changes from horizontal to vertical, requiring PCB layout modification. No voltage rating or operating temperature specifications are provided. This part is suitable only for applications with reduced current requirements and where PCB layout can accommodate vertical pin orientation.

Frequently Asked Questions (FAQ)

Q: Can RN122-3-02-4M5 be used as a direct replacement for RN122-3-02?

A: Yes, with design review. Both parts share identical inductance (4.5 mH), line count (2), mounting type (through-hole), and pin configuration (horizontal, 4 PC). The measurement frequency differs (10 kHz vs. 1 kHz), and the operating temperature range is reduced from -40°C ~ 125°C to -40°C ~ 100°C. Verify that your application operates within the reduced temperature range.

Q: What are the limitations of LF2420NP-452 as a substitute?

A: The current rating is 1.5A, which is 50% lower than the original 3A specification. DC resistance is 210 mOhm compared to 82.6 mOhm, resulting in higher power dissipation. Pin orientation is vertical rather than horizontal, requiring PCB layout changes. No voltage rating or operating temperature data is provided. This part is suitable only for applications with lower current demands and where layout modification is feasible.

Q: Why does inductance measurement frequency differ between parts?

A: Inductance values in common mode chokes vary with frequency due to core material properties. RN122-3-02 specifies 4.5 mH @ 1 kHz, while RN122-3-02-4M5 specifies 4.5 mH @ 10 kHz. Both deliver the same inductance value at their respective measurement frequencies. Application frequency requirements determine which measurement point is relevant.

Q: Are all substitute parts RoHS compliant?

A: Yes. RN122-3-02 is RoHS Compliant. Both RN122-3-02-4M5 and LF2420NP-452 are ROHS3 Compliant, meeting current environmental standards.

Q: What certifications should I verify for my application?

A: RN122-3-02-4M5 carries ENEC, UR, and VDE approvals, providing broader certification coverage than the original part (UR, VDE only). LF2420NP-452 provides no specified approval agencies. Verify that required certifications for your end application are present on the selected substitute.