Würth Elektronik 744822233 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744822233 is a 3.3 mH Common Mode Choke (CMC) designed for two-line power line filtering applications. This through-hole component operates at 1.5A maximum current with 120mOhm DC resistance and is rated for 250V AC operation across an extended temperature range of -40°C to 125°C. The part is Active status and ROHS3 compliant, making it suitable for modern electronic equipment requiring EMI suppression in power distribution circuits. Equivalent substitute parts may be required due to inventory constraints, design optimization, or application-specific parameter adjustments.

Substiute Parts

744822233

Würth ElektronikIn Stock: 2035744822233 Datasheet

Current PartRFQ

744821240

Würth ElektronikIn Stock: 985744821240 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744822233 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Number of Lines: 2
• Mounting Type: Through Hole
• Package / Case: Vertical, 4 PC Pin
• Voltage Rating - AC: 250V
• Operating Temperature Range: -40°C ~ 125°C
• Series: WE-CMB
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Inductance @ Frequency: ±20% tolerance acceptable for general power line filtering
• Current Rating (Max): Equal or greater than 1.5A
• DC Resistance (DCR) (Max): Variation permitted based on application thermal requirements

The substitute part 744821240 maintains all mandatory matching parameters while introducing controlled variations in inductance (4 mH vs. 3.3 mH) and DC resistance (140mOhm vs. 120mOhm), making it a valid parametric equivalent for applications where higher inductance filtering is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the 744822233 and 744821240 are Active status products from the Würth Elektronik WE-CMB series with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards.

The 744822233 (3.3 mH, 120mOhm) is the primary selection for applications requiring the specified inductance value and minimal DC resistance contribution to circuit losses.

The 744821240 (4 mH, 140mOhm) serves as a direct substitute when the higher inductance value is compatible with circuit design parameters. The increased inductance provides enhanced common-mode filtering at the cost of slightly elevated DC resistance. The smaller physical footprint of the 744821240 may provide PCB layout advantages in space-constrained designs.

Selection between these parts should be based on circuit frequency response requirements, thermal budget constraints, and available PCB real estate. Both parts maintain identical electrical ratings for voltage, current, and temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the 744821240 be used as a direct drop-in replacement for the 744822233?

A: Yes, from a mechanical and electrical interface perspective. Both parts use identical through-hole mounting with 4-pin vertical configuration and 250V AC rating. However, the higher inductance (4 mH vs. 3.3 mH) will alter circuit frequency response characteristics. Verify that your application can tolerate the increased filtering effect before substitution.

Q: What is the impact of the 20mOhm increase in DC resistance?

A: The 744821240 exhibits 140mOhm maximum DCR compared to 120mOhm for the 744822233. At 1.5A maximum current, this represents approximately 30mW additional power dissipation (I²R loss). For most power line filtering applications, this thermal contribution is negligible, but high-current or thermally constrained designs should evaluate this parameter.

Q: Are there physical installation differences between these parts?

A: Both parts are through-hole mounted with identical pin configuration. The 744821240 is physically smaller (15.00mm x 7.50mm vs. 17.50mm x 13.00mm) and lower profile (18.00mm vs. 22.00mm height). These dimensional differences may provide layout flexibility but do not affect electrical compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 744822233 and 744821240 are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. They share identical regulatory status.

Q: Which part should I select for new designs?

A: For new designs, select based on your specific inductance requirement at 10 kHz. If 3.3 mH is your target value, use the 744822233. If 4 mH filtering is acceptable or preferred, the 744821240 offers a smaller footprint alternative. Both are Active status products suitable for production use.