RN222-3-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN222-3-02 is a 2-line common mode choke designed for power line filtering applications. It features 4.5 mH inductance at 1 kHz with a 3A typical current rating and 82.6 mOhm DC resistance. The component is mounted through-hole with vertical 4-pin configuration and operates across -40°C to 125°C. This part carries obsolete product status, making identification of suitable substitutes necessary for ongoing design support and procurement.

Substiute Parts

RN222-3-02

Schaffner EMC Inc.In Stock: 997RN222-3-02 Datasheet

Current PartRFQ

RN222-3-02-4M5

Schaffner EMC Inc.In Stock: 917RN222-3-02-4M5 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The RN222-3-02-4M5 qualifies as a direct substitute based on the following alignment of critical parameters:

• Inductance Value: Both parts maintain 4.5 mH nominal inductance, with measurement frequency difference (1 kHz vs 10 kHz) reflecting standard industry measurement practices for the same component family
• Current Rating: Both rated at 3A, ensuring equivalent load-carrying capacity
• Number of Lines: Both are 2-line configurations for identical circuit topology
• Mounting and Package: Identical through-hole vertical 4-pin configuration and physical footprint (31.00mm x 18.00mm x 29.60mm)
• DC Resistance: RN222-3-02-4M5 exhibits 80 mOhm DCR, which is within acceptable tolerance of the original 82.6 mOhm specification
• Compliance: Both parts are RoHS compliant and REACH unaffected

The primary distinction is product status: RN222-3-02 is obsolete while RN222-3-02-4M5 is active, with enhanced certifications (ENEC added) and improved AC voltage rating (300V vs 250V).

Parameter Comparison

Engineering Selection Recommendations

The RN222-3-02-4M5 is the direct substitute for the obsolete RN222-3-02. Selection is supported by:

• Identical Electrical Performance: Matching inductance value, current rating, and DC resistance within specification tolerance
• Enhanced Compliance: ROHS3 certification and additional ENEC approval provide broader regulatory coverage
• Improved Voltage Rating: 300V AC rating exceeds the original 250V specification, offering design margin
• Active Product Status: Ensures ongoing availability and manufacturing support
• Footprint Compatibility: Identical physical dimensions and pin configuration enable direct PCB substitution

The reduced maximum operating temperature (100°C vs 125°C) should be evaluated against application thermal requirements. For applications requiring the full -40°C to 125°C range, thermal analysis of the substitute part in the specific circuit context is necessary.

Frequently Asked Questions (FAQ)

Q: Can RN222-3-02-4M5 be used as a direct replacement for RN222-3-02?

A: Yes. Both parts share identical inductance value, current rating, DC resistance tolerance, number of lines, mounting type, and physical footprint. The substitute part is electrically and mechanically compatible for direct PCB substitution.

Q: What is the significance of the different inductance measurement frequencies (1 kHz vs 10 kHz)?

A: Both parts are from the same RN222 series and maintain 4.5 mH nominal inductance. The measurement frequency difference reflects standard industry practice for characterizing common mode chokes across the frequency spectrum. The inductance value remains functionally equivalent for power line filtering applications.

Q: How does the DC resistance difference (82.6 mOhm vs 80 mOhm) affect circuit performance?

A: The 2.6 mOhm difference represents approximately 3% variation within normal manufacturing tolerance for this component class. This difference has negligible impact on power dissipation and thermal performance in typical power line filtering circuits.

Q: Is the reduced maximum operating temperature (100°C vs 125°C) a limitation?

A: The substitute part operates to 100°C maximum, compared to 125°C for the original. Applications operating near or above 100°C ambient or with high internal component heating should verify thermal performance through circuit simulation or testing.

Q: What certifications does the substitute part carry?

A: RN222-3-02-4M5 holds ENEC, UR, and VDE approvals, plus ROHS3 compliance. The original part carries UR and VDE approvals with RoHS compliance. The substitute provides enhanced regulatory coverage suitable for broader market applications.

Q: Are there packaging differences between these parts?

A: The original RN222-3-02 is supplied in standard packaging, while RN222-3-02-4M5 is supplied in tube packaging. Both maintain identical component specifications and through-hole vertical 4-pin configuration for PCB assembly.