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Product Detailed Parameters
- Description：CMC 39MH 400MA 2LN TH
- Series：RN
- Mfr：Schaffner EMC Inc.
- Package：Tray
- Filter Type：Power Line
- Number of Lines：2
- Current Rating (Max)：400mA (Typ)
- DC Resistance (DCR) (Max)：1.67Ohm (Typ)
- Voltage Rating - DC：-
- Voltage Rating - AC：250V
- Operating Temperature：-40°C ~ 125°C
- Ratings：-
- Approval Agency：UR, VDE
- Features：-
- Mounting Type：Through Hole
- Size / Dimension：0.709" L x 0.492" W (18.00mm x 12.50mm)
- Height (Max)：0.799" (20.30mm)
- Package / Case：Vertical, 4 PC Pin
- Inductance @ Frequency：39 mH @ 1 kHz
- Qualification：-
- Grade：-
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Overview
The Schaffner RN212-0.4-02 is a through-hole common mode choke designed for printed circuit board mounting. It features a ferrite core and operates within a temperature range of -40°C to +125°C. The component has a maximum DC current rating of 400 mA and a typical DC resistance of 1.5 Ohms. It provides an inductance of 39 mH with a tolerance of -30% to +50%, measured at a test frequency of 10 kHz. The physical dimensions are 18 mm x 12.5 mm x 20 mm, and it weighs approximately 8 grams.
Feature Summary
- Current compensated design for effective noise suppression
- Vertical PCB mount configuration for space efficiency
- Ferrite core construction for stable magnetic performance
Applications
- Power line filtering in electronic equipment
- Electromagnetic interference suppression in consumer electronics
- Common mode noise reduction in signal lines
Procurement Notes
Verify the specific part number against official TE Connectivity or Schaffner documentation to confirm electrical parameters and mechanical dimensions. Ensure compatibility with existing PCB layouts regarding lead spacing and mounting orientation. Cross-reference datasheets for thermal derating curves if operating near the upper temperature limit of 125°C.
Selection Notes
Select this component when a high inductance value of 39 mH is required for low-frequency noise attenuation. The 400 mA current rating suits applications with moderate power consumption. Consider the vertical form factor for assembly constraints and verify that the unshielded design meets spatial requirements without causing crosstalk issues.
Part Context
This component belongs to the RN series of common mode chokes manufactured by Schaffner EMC Inc., now part of TE Connectivity. The series offers various inductance and current ratings tailored for different EMC compliance needs. The RN212 variant specifically utilizes a vertical winding structure to optimize footprint area while maintaining robust filtering characteristics for power and signal lines.
Replacement Considerations
Check for direct substitutes within the RN212 family with adjusted inductance values, such as RN212-0.4-02-27M or RN212-0.4-02-39M, ensuring identical pinout and mechanical dimensions. Verify that alternative components meet the same current and temperature specifications.
