Equivalent & Substitute Parts for Würth Elektronik 7446220047

Part Overview

The Würth Elektronik 7446220047 is a 47 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 1.6Ohm and is rated for 250V 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 equipment requiring EMI suppression in two-line configurations.

Substitute parts may be required due to inventory availability, regional sourcing constraints, or specific application requirements where alternative inductance values or manufacturer certifications provide equivalent functional performance.

Substiute Parts

7446220047

Würth ElektronikIn Stock: 8797446220047 Datasheet

Current PartRFQ

7446120039

Würth ElektronikIn Stock: 8514997446120039 Datasheet

Parametric EquivalentRFQ

B82721K2401U030

EPCOS - TDK ElectronicsIn Stock: 4979B82721K2401U030 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7446220047 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Current Rating: 400mA (exact match required)
• Voltage Rating - AC: 250V (exact match required)
• Number of Lines: 2 (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Vertical, 4 PC Pin (exact match required)
• Operating Temperature Range: -40°C ~ 125°C (exact match required)

Secondary Compatibility Criteria:

• Inductance @ Frequency: Functionally equivalent within application tolerance
• DC Resistance (DCR): Functionally equivalent within application tolerance
• RoHS Status: ROHS3 Compliant (maintained)

The identified substitute parts meet all primary compatibility criteria. Inductance and DCR variations are within acceptable ranges for common mode choke applications where the primary function is EMI suppression rather than precise inductance matching.

Parameter Comparison

Engineering Selection Recommendations

7446120039 (Würth Elektronik): This substitute maintains identical electrical ratings and mechanical form factor as the main part. The inductance value of 39 mH represents a 17% reduction from the 47 mH specification, while DC resistance increases marginally from 1.6Ohm to 1.7Ohm. Both parts share the same series designation (WE-LF), Active product status, and ROHS3 compliance. This part is suitable for applications where the inductance tolerance permits operation at the lower value.

B82721K2401U030 (EPCOS - TDK Electronics): This substitute meets all primary compatibility criteria with identical current, voltage, temperature, and mechanical specifications. The inductance value of 460 µH represents a significant reduction from the 47 mH specification, positioning this part for applications requiring lower inductance filtering. DC resistance is marginally lower at 1.56Ohm. This part carries additional approval certifications (ENEC, UR, VDE) and maintains ROHS3 compliance, though REACH status is listed as Affected compared to Unaffected for the main part.

Frequently Asked Questions (FAQ)

Q: Can the 7446120039 be used as a direct replacement for the 7446220047?

A: The 7446120039 is mechanically and electrically compatible across all primary parameters. The inductance difference of 8 mH (39 mH vs. 47 mH) must be evaluated against your specific application requirements. Both parts are rated for 400mA at 250V AC with identical mounting and package specifications.

Q: What is the primary difference between the B82721K2401U030 and the main part?

A: The B82721K2401U030 operates at 460 µH inductance, approximately 100 times lower than the 47 mH main part. This represents a fundamentally different filtering characteristic suitable for applications requiring minimal inductance. All other electrical and mechanical parameters remain compatible.

Q: Are there size differences between these parts?

A: Yes. The main part 7446220047 measures 0.925" L x 0.630" W x 1.004" H. The 7446120039 measures 0.728" L x 0.531" W x 0.807" H. The B82721K2401U030 measures 0.717" L x 0.520" W x 0.803" H. Both substitutes are physically smaller, which may affect PCB layout considerations.

Q: Do all parts meet the same compliance standards?

A: All three parts are ROHS3 compliant and rated for -40°C to 125°C operation. The B82721K2401U030 carries additional third-party approvals (ENEC, UR, VDE). The main part and 7446120039 show REACH status as Unaffected, while the B82721K2401U030 shows REACH status as Affected.

Q: Which substitute should I select for my application?

A: Selection depends on your inductance requirement. For applications tolerating lower inductance values, the 7446120039 (39 mH) provides a Würth Elektronik solution with minimal parameter variation. For applications requiring significantly lower inductance, the B82721K2401U030 (460 µH) from EPCOS - TDK Electronics is appropriate. Verify inductance tolerance specifications in your circuit design before final selection.