# 744821039 (Component) ## Description 39 mH @ 10 kHz 2 Line Common Mode Choke Through Hole 300mA DCR The 744821039 is a common mode choke (CMC) designed for power line filtering. It is used to suppress electromagnetic interference (EMI), particularly common-mode noise in AC/DC power circuits and switching power supplies. Type: Common mode choke (power line filter) Inductance: 39 mH @ 10 kHz Rated current: 300 mA Number of lines: 2-line configuration Mounting: Through-hole (radial/vertical, 4 pins) AC voltage rating: up to 250 V DC resistance: ~3 Ω max Operating temperature: −40°C to +125°C Blocks high-frequency noise on power lines Allows normal differential current (useful signal) to pass Improves EMC compliance of electronic systems Reduces radio interference (RFI) in circuits AC/DC power supply input filters Switch-mode power supplies (SMPS) Industrial electronics and motor drives Household appliances and embedded systems Devices without proper grounding (noise suppression) #CommonPartsLibrary #Inductor #WE-CMB ## Component Details - **Owner:** adrian95 - **Created:** 4/16/2026 - **Last Updated:** 4/16/2026 - **Visibility:** Public - **Datasheet URL:** https://www.we-online.com/catalog/datasheet/744821039.pdf - **Part Type:** Inductors - **Manufacturer Part Number:** 744821039 - **Manufacturer Name:** Würth - **Inductance:** 39mH - **License:** https://creativecommons.org/licenses/by/4.0/ - **Used in:** 1 project ## Distributor Pricing (qty 1) *Pricing shown for quantity 1. For price breaks and other quantities, open in Flux.* | Distributor | Unit Price (qty 1) | Stock | |------------|--------------------|-------| | [Mouser](https://www.mouser.com/ProductDetail/Wurth-Elektronik/744821039?qs=4NsIomN5445B7Sp1P%2FqDrg%3D%3D) | $2.59 | 8.2K | - **Part Type:** Inductors - **Sub-Type:** Fixed - **Manufacturer:** Würth - **MPN:** 744821039 - **Mount Type:** Through Hole - **Package / Case Code:** TO - **Pin Count:** 4 - **Inductance:** 39mH ## Pins | Pin | Name | Type | |-----|------|------| | 1 | ~ | | | 2 | ~ | | | 3 | ~ | | | 4 | ~ | | --- *Generated from [https://www.flux.ai/adrian95/744821039](https://www.flux.ai/adrian95/744821039)*