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Product Detailed Parameters
- Description：CMC 39MH 300MA 2LN TH
- Series：WE-CMB
- Mfr：Würth Elektronik
- Package：Box
- Filter Type：Power Line
- Number of Lines：2
- Current Rating (Max)：300mA
- DC Resistance (DCR) (Max)：-
- Voltage Rating - DC：-
- Voltage Rating - AC：250V
- Operating Temperature：-40°C ~ 125°C
- Ratings：-
- Approval Agency：-
- Features：-
- Mounting Type：Through Hole
- Size / Dimension：0.591" L x 0.295" W (15.00mm x 7.50mm)
- Height (Max)：0.709" (18.00mm)
- Package / Case：Vertical, 4 PC Pin
- Inductance @ Frequency：39 mH @ 10 kHz
- Impedance @ Frequency：-
- Qualification：-
- Grade：-
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Overview
The Würth Elektronik 744821039 is a WE-CMB series common mode power line choke designed for through-hole PCB mounting. It features an inductance of 39 mH with a maximum DC current rating of 300 mA and a maximum DC resistance of 3 ohms. The component operates within a temperature range of -40°C to +125°C and supports a voltage rating of 250 V.
Feature Summary
- Provides effective common mode noise suppression for power lines
- Designed for robust performance in high-temperature environments up to 125°C
- Utilizes radial through-hole termination for secure PCB integration
Applications
- Smart home appliances
- White household appliances
- Air filtration systems
- Greenhouse control units
Procurement Notes
Verify the specific package type and tolerance requirements against the official datasheet before ordering. Confirm that the 300 mA current rating meets the circuit's operational needs. Ensure compatibility with the intended operating temperature range of -40°C to +125°C. Cross-reference the part number with authorized distributors to ensure authenticity and availability.
Selection Notes
Select this component when high inductance values are required for power line filtering in compact applications. The WE-CMB series offers a balance of high impedance and low DC resistance. Consider the through-hole mounting style if surface area is limited or mechanical stability is prioritized over automated SMT assembly processes.
Part Context
This component belongs to the WE-CMB series of common mode chokes from Würth Elektronik. The series is engineered for power line applications, offering various inductance and current ratings. It is distinct from the WE-MK RF inductor and WE-CMDC data line filter series, focusing specifically on power supply noise reduction.
Replacement Considerations
Check for direct substitutes within the WE-CMB series with similar inductance and current ratings. Verify pinout compatibility and physical dimensions before replacing. Consult manufacturer documentation for any updated revisions or alternative part numbers with enhanced specifications.
