Würth Elektronik 7446620039 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7446620039 is a 39 mH Common Mode Choke (CMC) designed for power line filtering applications. This through-hole mounted component operates at 400mA maximum current with a DC resistance of 1.7Ohm and supports 250V AC voltage rating. The part is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Equivalent and substitute parts are identified when design requirements permit variations in inductance value, physical dimensions, or DC resistance while maintaining core electrical and mechanical compatibility within the WE-LF series.

Substiute Parts

7446620039

Würth ElektronikIn Stock: 31877446620039 Datasheet

Current PartRFQ

7446720047

Würth ElektronikIn Stock: 11667446720047 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7446620039 is permissible when design specifications allow for inductance values within the WE-LF series range while maintaining the following critical parameters:

• Current Rating: 400mA maximum
• Mounting Type: Through Hole configuration
• Number of Lines: 2-line common mode choke
• Voltage Rating: 250V AC minimum
• Operating Temperature Range: -40°C ~ 125°C
• Package Configuration: Horizontal, 4 PC Pin
• Compliance: RoHS3 Compliant, REACH Unaffected

The substitute part 7446720047 meets all mandatory electrical and mechanical criteria. Variations in inductance (39 mH to 47 mH @ 10 kHz) and DC resistance (1.7Ohm to 2Ohm) are permissible when circuit design tolerances accommodate these parameter shifts. Physical dimension changes resulting from inductance variation do not affect through-hole mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 7446620039 and 7446720047 maintain Active product status within the Würth Elektronik WE-LF series. Selection between these parts is determined by circuit inductance requirements and available PCB layout space.

The 7446620039 provides 39 mH inductance with 1.7Ohm DC resistance in a compact 18.00mm x 18.00mm footprint. This configuration is suitable for applications requiring minimal board space with moderate inductance filtering.

The 7446720047 provides 47 mH inductance with 2Ohm DC resistance in a larger 23.00mm x 23.00mm footprint. This configuration delivers higher inductance filtering performance and is suitable for applications where increased common mode attenuation is required.

Both parts satisfy RoHS3 compliance and REACH unaffected requirements. Current rating, voltage rating, operating temperature range, and mounting configuration remain identical across both options, ensuring electrical and thermal compatibility within specified design parameters.

Frequently Asked Questions (FAQ)

Q: Can the 7446720047 directly replace the 7446620039 on existing PCBs?

A: Direct PCB replacement requires layout verification. The 7446720047 has a larger footprint (23.00mm x 23.00mm versus 18.00mm x 18.00mm) and greater height (14.50mm versus 13.00mm). Through-hole pin configuration remains compatible, but available board space must accommodate the increased dimensions.

Q: What is the impact of the inductance difference between 39 mH and 47 mH?

A: The 47 mH inductance provides approximately 20% higher common mode filtering at 10 kHz. Circuit design must account for this inductance variation. Applications with strict inductance tolerance requirements should specify the exact part number rather than accepting substitution.

Q: Does the DC resistance increase from 1.7Ohm to 2Ohm affect circuit performance?

A: The 0.3Ohm increase in DC resistance results in proportionally higher power dissipation at 400mA operation. Thermal design calculations should incorporate this parameter change. The increase is approximately 18% relative to the original 1.7Ohm specification.

Q: Are both parts suitable for the same voltage and temperature operating conditions?

A: Yes. Both parts maintain 250V AC voltage rating and -40°C ~ 125°C operating temperature range. Environmental and electrical stress conditions are equivalent across both options.

Q: What packaging and inventory considerations apply to these parts?

A: Both parts are supplied in Tray packaging. The 7446620039 has 3088 pieces in stock, while the 7446720047 has 1095 pieces in stock. Procurement lead times and availability may differ based on current inventory levels.