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Product Detailed Parameters
- Description：CMC 39MH 400MA 2LN TH
- Series：WE-LF
- Mfr：Würth Elektronik
- Package：Tray
- Filter Type：Power Line
- Number of Lines：2
- Current Rating (Max)：400mA
- DC Resistance (DCR) (Max)：1.7Ohm
- Voltage Rating - DC：-
- Voltage Rating - AC：250V
- Operating Temperature：-40°C ~ 125°C
- Ratings：-
- Approval Agency：-
- Features：-
- Mounting Type：Through Hole
- Size / Dimension：0.728" L x 0.531" W (18.50mm x 13.50mm)
- Height (Max)：0.807" (20.50mm)
- Package / Case：Vertical, 4 PC Pin
- Inductance @ Frequency：39 mH @ 10 kHz
- Impedance @ Frequency：-
- Qualification：-
- Grade：-
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Overview
The Würth Elektronik 7446120039 is a through-hole common mode choke from the WE-LF series, designed for mains power line filtering. It features an inductance of 39 mH at 10 kHz and supports a rated current of 400 mA with a maximum DC resistance of 1.7 ohms. The component operates within a temperature range of -40°C to 125°C and is rated for 250 V AC. It utilizes a horizontal package with four pins.
Feature Summary
- Provides effective attenuation of common mode noise on AC power lines
- Constructed for robust through-hole mounting applications
- Designed to meet RoHS 3 compliance standards
Applications
- Mains power input filtering
- AC power supply noise suppression
- Electromagnetic interference reduction in consumer electronics
Procurement Notes
Verify the specific manufacturer part number against official datasheets to ensure compatibility with design requirements. Confirm that the through-hole package dimensions and pin configuration match the target PCB layout. Check for any recent product change notices regarding marking or material updates before finalizing procurement plans.
Selection Notes
Select this component when designing circuits requiring high inductance values for low-frequency common mode noise suppression on AC lines. Ensure the operating current does not exceed the 400 mA rating to maintain performance. Consider the physical size constraints of the horizontal package during board layout planning.
Part Context
This component belongs to the WE-LF series of common mode chokes specifically engineered for mains power line applications. The series offers various inductance and current ratings to suit different power filtering needs while maintaining compact form factors suitable for standard electronic assemblies.
Replacement Considerations
Cross-reference with other WE-LF series parts such as 7446620039 for equivalent electrical specifications but different mounting styles. Verify that substitute components match the required inductance, current rating, and voltage ratings.
