RN212-0.4-02 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The RN212-0.4-02 is a 39 mH, 2-line common mode choke manufactured by Schaffner EMC Inc., designed for power line filtering applications in through-hole mounting configurations. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part delivers 400mA typical current rating with 1.67Ohm typical DC resistance and operates across -40°C to 125°C temperature range with 250V AC voltage rating.

Substiute Parts

RN212-0.4-02

Schaffner EMC Inc.In Stock: 2250RN212-0.4-02 Datasheet

Current PartRFQ

RN212-0.4-02-39M

Schaffner EMC Inc.In Stock: 3459RN212-0.4-02-39M Datasheet

DirectRFQ

B82721K2401N020

EPCOS - TDK ElectronicsIn Stock: 30406B82721K2401N020 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RN212-0.4-02 are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 39 mH
• Number of lines: 2-line configuration
• Current rating: 400mA
• Mounting type: Through Hole
• Package configuration: Vertical, 4 PC Pin
• Filter classification: Power Line

Allowable Parameter Variations:

• DC Resistance (DCR): Tolerance range 1.5Ohm to 2.0Ohm typical
• Voltage Rating - AC: Minimum 250V (higher ratings acceptable)
• Operating Temperature: Minimum -40°C to 100°C (extended ranges acceptable)
• Inductance frequency reference: 1 kHz or 10 kHz (both acceptable for 39 mH specification)
• Physical dimensions: Minor variations within ±0.02" acceptable for through-hole compatibility

Parameter Comparison

Engineering Selection Recommendations

RN212-0.4-02-39M (Direct Substitute - Preferred)

This part is the direct manufacturer equivalent from Schaffner EMC Inc. with active product status. It maintains identical physical dimensions and mounting configuration to the obsolete RN212-0.4-02. The part features improved DC resistance (1.5Ohm vs. 1.67Ohm), higher AC voltage rating (300V vs. 250V), and enhanced compliance certifications (ENEC, UR, VDE). The inductance measurement at 10 kHz versus 1 kHz represents a standard industry practice for common mode choke characterization and does not affect functional equivalence. Operating temperature range is -40°C to 100°C, which covers most industrial applications; designs requiring 125°C operation should evaluate thermal margins.

B82721K2401N020 (Alternative Substitute - Cross-Manufacturer)

This EPCOS - TDK Electronics part provides an alternative from a different manufacturer with active product status. Physical dimensions show minor variations (0.717" L x 0.520" W vs. 0.709" L x 0.492" W and 0.823" height vs. 0.799"), which remain within acceptable through-hole PCB mounting tolerances. DC resistance is slightly higher at 2Ohm typical. The part maintains full compliance certifications (ENEC, UR, VDE) and operates across the full -40°C to 125°C temperature range. This option provides higher inventory availability (30,300 pcs) compared to the direct substitute.

Frequently Asked Questions (FAQ)

Q: Can RN212-0.4-02-39M be used as a direct replacement for RN212-0.4-02?

A: Yes. Both parts share identical inductance (39 mH), current rating (400mA), mounting type (through hole), and physical dimensions. The RN212-0.4-02-39M is the active equivalent from the same manufacturer with improved specifications and compliance certifications.

Q: What is the significance of the inductance frequency difference (1 kHz vs. 10 kHz)?

A: Common mode chokes exhibit frequency-dependent inductance characteristics. Both 1 kHz and 10 kHz measurements represent standard industry characterization points. The 39 mH inductance value remains constant across both parts; the frequency reference indicates the measurement condition only.

Q: Are there physical dimension differences between the substitute parts?

A: RN212-0.4-02-39M maintains identical dimensions to the original part (18.00mm L x 12.50mm W x 20.30mm H). B82721K2401N020 shows minor variations (18.20mm L x 13.20mm W x 20.90mm H). These differences remain within standard through-hole PCB mounting tolerances and do not affect functional compatibility.

Q: Which substitute part should be selected for new designs?

A: RN212-0.4-02-39M is recommended for direct replacement applications due to identical dimensions and same-manufacturer sourcing. B82721K2401N020 is suitable for applications where cross-manufacturer sourcing and higher inventory availability are priorities, provided PCB layout accommodates the minor dimensional variations.

Q: What are the compliance differences between the parts?

A: RN212-0.4-02 carries UR and VDE certifications. Both substitute parts carry enhanced certifications including ENEC, UR, and VDE. B82721K2401N020 carries REACH Affected status, while RN212-0.4-02 and RN212-0.4-02-39M are REACH Unaffected.

Q: Is the higher DC resistance of B82721K2401N020 (2Ohm vs. 1.67Ohm) a concern?

A: DC resistance affects power dissipation and thermal performance. At 400mA operation, the resistance difference results in approximately 0.22mW additional power dissipation. This is negligible in most applications but should be evaluated in thermally constrained designs.

Q: Can these parts be used interchangeably in existing assemblies?

A: RN212-0.4-02-39M provides direct interchangeability. B82721K2401N020 requires PCB layout verification due to dimensional variations, particularly the increased height (20.90mm vs. 20.30mm) and width (13.20mm vs. 12.50mm).