Equivalent & Substitute Parts for Würth Elektronik 744862120

Part Overview

The Würth Elektronik 744862120 is a 12 mH Common Mode Choke (CMC) designed for power line filtering applications. This through-hole mounted component operates at 400mA maximum current with a 2Ohm DC resistance and is rated for 400V AC operation across an operating temperature range of -40°C to 125°C. The part is Active in product status and ROHS3 compliant, making it suitable for modern electronic applications requiring EMI suppression in two-line configurations.

Equivalent and substitute parts are identified when design requirements allow for variations in inductance, current rating, or DC resistance while maintaining compatibility with the application's electrical and mechanical constraints.

Substiute Parts

744862120

Würth ElektronikIn Stock: 837744862120 Datasheet

Current PartRFQ

744861100

Würth ElektronikIn Stock: 914744861100 Datasheet

Parametric EquivalentRFQ

744862100

Würth ElektronikIn Stock: 1053744862100 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 744862120 are identified based on the following allowed parameter variations:

Core Compatibility Criteria:

• Filter Type: Power Line (fixed)
• Number of Lines: 2 (fixed)
• Mounting Type: Through Hole (fixed)
• Voltage Rating - AC: 400V (fixed)
• Operating Temperature: -40°C ~ 125°C (fixed)
• RoHS Status: ROHS3 Compliant (fixed)
• Package / Case: Vertical, 4 PC Pin (fixed)

Variable Parameters Allowing Substitution:

• Inductance @ Frequency: 10 mH to 12 mH @ 10 kHz
• Current Rating (Max): 400mA to 450mA
• DC Resistance (DCR) (Max): 1.65Ohm to 2Ohm
• Physical Dimensions: Minor variations in length and width within the through-hole footprint
• Series: WE-TFC or WE-TFCH

The identified substitutes maintain electrical performance within acceptable ranges for common mode choke applications while preserving all critical safety and compliance attributes.

Parameter Comparison

Engineering Selection Recommendations

744862120 (Primary Part): Use when 12 mH inductance at 10 kHz is required for the application and current demand does not exceed 400mA. This part maintains the highest inductance value among the three options and is suitable for designs requiring maximum EMI attenuation at the specified frequency.

744862100 (Direct Substitute): This part is electrically compatible with the main part for applications where 10 mH inductance is acceptable. It offers improved current handling (450mA vs 400mA) and lower DC resistance (1.65Ohm vs 2Ohm), resulting in reduced power dissipation. Physical dimensions are identical to the main part, ensuring direct PCB footprint compatibility. Both parts belong to the WE-TFC series and share identical compliance certifications.

744861100 (Alternative Substitute): This part operates at 10 mH inductance with 450mA current rating and 1.65Ohm DCR. It belongs to the WE-TFCH series and features a reduced height (0.485" vs 0.669") and increased width (0.610" vs 0.433"), which may be advantageous in space-constrained applications with vertical clearance limitations. All three parts maintain identical voltage ratings, temperature ranges, and compliance status.

All substitute parts are Active in product status and ROHS3 compliant, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can 744862100 replace 744862120 in my design? A: Yes, 744862100 is electrically compatible when 10 mH inductance is acceptable for your application. It provides superior current handling (450mA vs 400mA) and lower DC resistance (1.65Ohm vs 1.65Ohm), with identical physical footprint and compliance certifications.

Q: What is the difference between WE-TFC and WE-TFCH series? A: Both series are two-line common mode chokes for power line filtering with identical electrical ratings and compliance. The primary difference is physical packaging: WE-TFC maintains a standard profile, while WE-TFCH offers reduced height for space-constrained applications.

Q: Will 744861100 fit my PCB if designed for 744862120? A: 744861100 has different physical dimensions (width 0.610" vs 0.433", height 0.485" vs 0.669"). While the through-hole pin configuration remains compatible, PCB layout verification is required to confirm clearance and spacing compatibility.

Q: Are all three parts ROHS3 compliant? A: Yes, all three parts (744862120, 744862100, and 744861100) are ROHS3 compliant and rated for -40°C to 125°C operation with 400V AC voltage rating.

Q: What inductance value should I select? A: The main part (744862120) provides 12 mH inductance, while both substitutes provide 10 mH. Select based on your EMI filtering requirements at 10 kHz. Lower inductance may be acceptable if your design margin permits.

Q: Does lower DC resistance affect performance? A: Lower DC resistance (1.65Ohm vs 2Ohm) reduces power dissipation and heat generation, which is beneficial for thermal management. This does not negatively impact filtering performance.