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Product Detailed Parameters
- Description：CMC 39MH 550MA 2LN SMD
- Series：WE-LF
- Mfr：Würth Elektronik
- Package：Tape & Reel (TR),Cut Tape (CT)
- Filter Type：Power Line
- Number of Lines：2
- Current Rating (Max)：550mA
- 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：Surface Mount
- Size / Dimension：0.917" L x 0.728" W (23.30mm x 18.50mm)
- Height (Max)：0.453" (11.50mm)
- Package / Case：Horizontal, 4 PC Pad
- Inductance @ Frequency：39 mH @ 10 kHz
- Impedance @ Frequency：-
- Qualification：-
- Grade：-
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Overview
The Würth Elektronik 7446630039 is a surface-mount common mode choke from the WE-LF series, designed for mains power line suppression. It features an inductance of 39 mH at 10 kHz and supports a rated current of 550 mA. The component has a maximum DC resistance of 1.7 ohms and operates within a temperature range of -40°C to +125°C. Its physical dimensions are 23.30 mm x 18.50 mm x 11.50 mm, utilizing a horizontal four-terminal package configuration.
Feature Summary
- Provides effective attenuation of common mode noise on AC power lines
- Constructed with a shielded design to minimize electromagnetic interference
- Engineered for high reliability in demanding thermal environments
Applications
- Power supply input filtering
- Mains-powered electronic equipment noise suppression
- AC line interface protection circuits
Procurement Notes
Verify the specific ordering suffix against the manufacturer datasheet to ensure correct packaging format availability. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into the assembly process. Cross-reference the part number with official distributor catalogs to validate current production status and lead time estimates.
Selection Notes
Select this component when designing circuits requiring significant common mode noise reduction on AC inputs. Ensure the operating current remains below the 550 mA rating to prevent saturation. Verify that the PCB footprint accommodates the specified horizontal terminal spacing and height constraints for proper mechanical mounting.
Part Context
This component belongs to the WE-LF series of surface-mount common mode chokes manufactured by Würth Elektronik. The series is specifically engineered for applications involving mains power lines, offering robust shielding and stable performance across a wide temperature range compared to standard unshielded alternatives.
Replacement Considerations
Consult the official Würth Elektronik cross-reference documentation for verified substitute part numbers. Do not assume functional equivalence based solely on similar inductance or current ratings without verifying pinout compatibility and physical dimensions.
