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

Part Overview

The RN122-4-02 is a 3.3 mH common mode choke (CMC) designed for power line filtering applications. This through-hole mounted component features a 2-line configuration with a 4A typical current rating and 48 mOhm DC resistance. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

RN122-4-02

Schaffner EMC Inc.In Stock: 1014RN122-4-02 Datasheet

Current PartRFQ

RN122-4-02-3M3

Schaffner EMC Inc.In Stock: 3098RN122-4-02-3M3 Datasheet

DirectRFQ

B82724J2402N001

EPCOS - TDK ElectronicsIn Stock: 2831B82724J2402N001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RN122-4-02 is determined by the following critical parameters:

• Inductance Value: 3.3 mH @ 10 kHz (core filtering characteristic)
• Number of Lines: 2-line configuration (functional requirement)
• Current Rating: 4A minimum (electrical capacity)
• Mounting Type: Through Hole (mechanical compatibility)
• Package Configuration: 4 PC Pin (footprint compatibility)

Substitute parts must maintain these core specifications to ensure functional equivalence. Variations in DC resistance, voltage rating, operating temperature range, and physical dimensions are permissible within engineering tolerances, provided the primary electrical and mechanical parameters remain compatible.

Parameter Comparison

Engineering Selection Recommendations

RN122-4-02-3M3 (Direct Schaffner Equivalent)

This part is the primary substitute for the obsolete RN122-4-02. Both components are manufactured by Schaffner EMC Inc. and share identical electrical specifications for inductance, line configuration, and current rating. The RN122-4-02-3M3 is currently in active production status with higher inventory availability. It maintains the same horizontal 4 PC pin package configuration and meets all required certifications (ENEC, UR, VDE). The operating temperature range is reduced to -40°C ~ 100°C compared to the original -40°C ~ 125°C specification. DC resistance is marginally lower at 46 mOhm, and AC voltage rating is increased to 300V, both favorable characteristics. This part is ROHS3 compliant and carries MSL rating of 1 (Unlimited).

B82724J2402N001 (Cross-Manufacturer Alternative)

This EPCOS - TDK Electronics part provides functional equivalence with identical inductance, line count, and current rating specifications. It maintains the same -40°C ~ 125°C operating temperature range as the original part and meets all required certifications (ENEC, UR, VDE). The primary consideration is the package configuration change from horizontal to vertical 4 PC pin orientation, which requires PCB layout verification. DC resistance is higher at 65 mOhm compared to the original 48 mOhm specification. This part is ROHS3 compliant and carries REACH Affected status. Physical dimensions differ significantly due to the vertical orientation.

Frequently Asked Questions (FAQ)

Q: Can RN122-4-02-3M3 be used as a direct replacement for RN122-4-02?

A: Yes. Both parts share identical inductance (3.3 mH @ 10 kHz), line configuration (2-line), current rating (4A), and mounting type (through hole). The horizontal 4 PC pin package is identical. The RN122-4-02-3M3 is the recommended substitute due to active production status and improved specifications (lower DCR, higher AC voltage rating).

Q: What are the implications of using B82724J2402N001 instead of RN122-4-02?

A: The B82724J2402N001 maintains electrical equivalence for inductance, line count, and current rating. However, the package configuration changes from horizontal to vertical orientation, requiring PCB layout modification. DC resistance increases from 48 mOhm to 65 mOhm, which may affect thermal performance in high-current applications. Physical dimensions are significantly different. PCB footprint compatibility must be verified before implementation.

Q: Are there temperature range limitations when substituting parts?

A: The RN122-4-02-3M3 operates within -40°C ~ 100°C, which is narrower than the original -40°C ~ 125°C range. Applications requiring operation above 100°C should use B82724J2402N001, which maintains the full -40°C ~ 125°C range. Verify application temperature requirements before selection.

Q: What compliance certifications apply to substitute parts?

A: RN122-4-02-3M3 holds ENEC, UR, and VDE certifications with ROHS3 compliance. B82724J2402N001 holds ENEC, UR, and VDE certifications with ROHS3 compliance and REACH Affected status. Both parts meet the original UR and VDE requirements with enhanced certification coverage.

Q: How does DC resistance variation affect component selection?

A: The original RN122-4-02 specifies 48 mOhm DCR. RN122-4-02-3M3 provides 46 mOhm (lower), and B82724J2402N001 provides 65 mOhm (higher). Lower DCR reduces power dissipation and heat generation. Higher DCR increases power loss proportionally to current squared. For applications sensitive to thermal performance, RN122-4-02-3M3 is preferred. For general filtering applications, B82724J2402N001 remains acceptable within the 4A current rating.