Würth Elektronik 7446222003 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7446222003 is a 3.3 mH Common Mode Choke (CMC) designed for power line filtering applications. This through-hole mounted component features a 2-line configuration with a 2A current rating and 75 mOhm DC resistance. The part is ROHS3 compliant and actively produced, making it suitable for EMI/RFI suppression in power distribution circuits. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the WE-LF and equivalent series families.

Substiute Parts

7446222003

Würth ElektronikIn Stock: 12037446222003 Datasheet

Current PartRFQ

7446122001

Würth ElektronikIn Stock: 31887446122001 Datasheet

Parametric EquivalentRFQ

7446222002

Würth ElektronikIn Stock: 10257446222002 Datasheet

Parametric EquivalentRFQ

B82721K2222U030

EPCOS - TDK ElectronicsIn Stock: 3612B82721K2222U030 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7446222003 are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

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

Secondary Electrical Parameters (Allowable Variation):

• Inductance @ Frequency: Range from 1 mH to 10 µH at specified frequencies
• Current Rating (Max): 2A or higher
• DC Resistance (Max): 60 mOhm to 75 mOhm

The substitute parts 7446122001, 7446222002, and B82721K2222U030 meet these criteria with variations in inductance values and DC resistance that remain within acceptable operating parameters for common mode choke applications.

Parameter Comparison

Engineering Selection Recommendations

7446122001 (Würth Elektronik WE-LF Series) This substitute features lower inductance (1 mH) and reduced DC resistance (60 mOhm). Selection is appropriate when lower inductance filtering is required or when minimizing power dissipation is a design priority. ROHS3 compliance and active product status ensure long-term availability.

7446222002 (Würth Elektronik WE-LF Series) This substitute provides intermediate inductance (2.2 mH) with reduced DC resistance (60 mOhm) compared to the main part. Physical dimensions match the main part exactly. This option is suitable for applications requiring slightly lower inductance with improved thermal performance. ROHS3 compliance and active status confirm production continuity.

B82721K2222U030 (EPCOS - TDK Electronics B82721 Series) This substitute operates at a different frequency specification (10 µH @ 100 kHz) with slightly higher current rating (2.2A) and comparable DC resistance (70 mOhm). The part carries additional certifications (ENEC, UR, VDE) and is REACH Affected. Selection is appropriate when cross-manufacturer qualification is acceptable and higher current capacity is beneficial. Compact physical dimensions (18.20mm L x 13.20mm W) differ from the main part.

All substitute parts maintain 250V AC voltage rating, -40°C to 125°C operating temperature range, and through-hole vertical 4-pin package configuration.

Frequently Asked Questions (FAQ)

Q: Can 7446122001 be used as a direct replacement for 7446222003? A: 7446122001 is electrically compatible but features lower inductance (1 mH vs. 3.3 mH). Direct substitution is possible only if circuit design tolerates reduced inductance filtering. Both parts share identical mounting type, pin configuration, voltage rating, and temperature range.

Q: What is the primary difference between 7446222002 and 7446222003? A: The inductance values differ (2.2 mH vs. 3.3 mH), and DC resistance is lower (60 mOhm vs. 75 mOhm). Physical dimensions and pin configuration are identical. 7446222002 is suitable when intermediate inductance and lower power dissipation are required.

Q: Is B82721K2222U030 a suitable substitute despite different inductance specification? A: B82721K2222U030 operates at a different frequency point (10 µH @ 100 kHz vs. 3.3 mH @ 10 kHz). Substitution is valid only if circuit requirements accommodate this inductance difference. The part maintains compatible mounting, voltage rating, temperature range, and pin configuration. Cross-manufacturer qualification may be required.

Q: Do all substitute parts maintain the same physical footprint? A: No. 7446122001 and B82721K2222U030 have smaller dimensions (18.50mm L x 14.60mm W and 18.20mm L x 13.20mm W respectively) compared to the main part and 7446222002 (24.60mm L x 16.00mm W). PCB layout verification is necessary before substitution.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, ensuring regulatory alignment with the main part 7446222003.

Q: What is the significance of the REACH status difference for B82721K2222U030? A: B82721K2222U030 is REACH Affected, whereas 7446222003 is REACH Unaffected. This indicates different regulatory documentation requirements. Compliance verification with regional regulations is necessary before selection.