RN212-4-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN212-4-02 is a 700 µH common mode choke (CMC) designed for power line filtering applications in two-line configurations. Manufactured by Schaffner EMC Inc., this through-hole component is rated for 4A typical current with a 27 mOhm typical DC resistance. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Substiute Parts

RN212-4-02

Schaffner EMC Inc.In Stock: 1681RN212-4-02 Datasheet

Current PartRFQ

RN212-4-02-0M7

Schaffner EMC Inc.In Stock: 8918RN212-4-02-0M7 Datasheet

DirectRFQ

B82721K2402N020

EPCOS - TDK ElectronicsIn Stock: 1938B82721K2402N020 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN212-4-02 is determined by the following critical parameters:

• Inductance Value: 700 µH nominal inductance
• Number of Lines: 2-line common mode configuration
• Current Rating: Minimum 4A capability
• Mounting Type: Through-hole vertical orientation
• Package Configuration: 4-pin vertical package
• Physical Dimensions: Compatible footprint within specified length, width, and height tolerances
• Voltage Rating: AC voltage rating of 250V or higher
• Operating Temperature Range: Support for -40°C to 125°C minimum

Two substitute parts meet these criteria:

RN212-4-02-0M7 (Direct Manufacturer Equivalent): Same manufacturer (Schaffner EMC Inc.), identical series designation, matching inductance and line configuration. Product status is active with improved DCR specification (24 mOhm vs. 27 mOhm) and higher AC voltage rating (300V vs. 250V). Dimensions and mounting are identical.

B82721K2402N020 (Similar Manufacturer Alternative): EPCOS - TDK Electronics product with matching inductance value, 2-line configuration, and 4A current rating. Inductance is specified at 100 kHz rather than 10 kHz. Physical dimensions show minor variations within acceptable tolerance. Product status is active with full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

RN212-4-02-0M7 is the primary recommended substitute. As a direct manufacturer equivalent from Schaffner EMC Inc., it provides identical electrical performance with enhanced specifications: lower DC resistance (24 mOhm vs. 27 mOhm) and higher AC voltage rating (300V vs. 250V). The part maintains identical physical dimensions and mounting configuration. Product status is active with expanded compliance certifications (ENEC, UR, VDE vs. UR, VDE). Operating temperature range is reduced to -40°C to 100°C; verify this meets application requirements if operation above 100°C is required.

B82721K2402N020 serves as an alternative when RN212-4-02-0M7 availability is constrained. This EPCOS - TDK Electronics product maintains the same inductance value, current rating, and 2-line configuration. Physical dimensions show minor increases (0.717" L x 0.520" W vs. 0.709" L x 0.492" W; height 0.823" vs. 0.799"). DC resistance is slightly higher at 30 mOhm. The part carries full compliance certifications (ENEC, UR, VDE) and supports the full -40°C to 125°C operating range. Verify PCB layout accommodates the slightly larger footprint before selection.

Frequently Asked Questions (FAQ)

Q: Can RN212-4-02-0M7 be used as a direct drop-in replacement for RN212-4-02?

A: Yes. RN212-4-02-0M7 maintains identical inductance (700 µH @ 10 kHz), current rating (4A), mounting type (through-hole), and physical dimensions (0.709" L x 0.492" W x 0.799" H). Electrical performance is equivalent or superior. Verify the reduced upper operating temperature limit (100°C vs. 125°C) is acceptable for your application.

Q: What is the difference between the 10 kHz and 100 kHz inductance specifications?

A: Inductance values are frequency-dependent. RN212-4-02 and RN212-4-02-0M7 specify 700 µH at 10 kHz, while B82721K2402N020 specifies 700 µH at 100 kHz. Both parts deliver the same nominal inductance value; the measurement frequency reflects manufacturer test methodology. For power line filtering applications, both are functionally equivalent.

Q: Will B82721K2402N020 fit the existing PCB layout?

A: B82721K2402N020 has slightly larger dimensions: 0.717" L x 0.520" W (vs. 0.709" L x 0.492" W) and 0.823" height (vs. 0.799"). These differences are approximately 0.008" in length, 0.028" in width, and 0.024" in height. Verify your PCB layout and component placement clearances accommodate these tolerances before committing to this substitute.

Q: Are there compliance or certification differences between the substitutes?

A: RN212-4-02-0M7 adds ENEC certification compared to the original part (ENEC, UR, VDE vs. UR, VDE). B82721K2402N020 carries identical certifications (ENEC, UR, VDE). Both substitutes meet ROHS3 compliance. All three parts are EAR99 classified. Verify your application requirements against the specific certifications needed.

Q: What is the impact of the DCR difference between parts?

A: RN212-4-02-0M7 has lower DCR (24 mOhm vs. 27 mOhm), resulting in reduced power dissipation and heat generation. B82721K2402N020 has slightly higher DCR (30 mOhm). For 4A operation, the DCR difference translates to approximately 0.064W (RN212-4-02), 0.064W (RN212-4-02-0M7), and 0.048W (B82721K2402N020) power dissipation. Verify thermal performance is acceptable for your application environment.

Q: Can these parts be used interchangeably in new designs?

A: Yes, all three parts are suitable for new designs. RN212-4-02-0M7 is recommended as the primary choice due to active product status, identical specifications, and superior performance. B82721K2402N020 is acceptable as a secondary option, provided PCB layout accommodates the slightly larger footprint and thermal performance is verified for the marginally higher DCR.