Würth Elektronik 744866103 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744866103 is a 10 mH common mode choke (CMC) designed for two-line power line filtering applications in through-hole configurations. This component features a 3.4A maximum current rating and 110 mOhm DC resistance, operating across a temperature range of -40°C to 125°C with 250V AC voltage rating.

The 744866103 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component specification.

Substiute Parts

744866103

Würth ElektronikIn Stock: 975744866103 Datasheet

Current PartRFQ

744825410

Würth ElektronikIn Stock: 974744825410 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744866103 is determined by the following critical parameters:

• Inductance Value: 10 mH @ 10 kHz (must match exactly)
• Number of Lines: 2-line configuration (must match)
• Filter Type: Power Line (must match)
• Mounting Type: Through Hole (must match)
• Package Configuration: Vertical, 4 PC Pin (must match)
• Voltage Rating - AC: 250V minimum (must meet or exceed)
• Operating Temperature Range: -40°C ~ 125°C (must meet or exceed)
• RoHS Compliance: ROHS3 Compliant (must maintain)

The substitute part 744825410 maintains all critical electrical and mechanical parameters while offering improved current handling capacity and reduced DC resistance. This part belongs to the WE-CMB series and carries active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

The 744825410 is a direct functional substitute for the obsolete 744866103. Both components maintain identical inductance specifications, line configuration, voltage ratings, and operating temperature ranges. The substitute part carries active product status, ensuring continued availability and manufacturing support.

The 744825410 provides enhanced electrical performance through reduced DC resistance (55 mOhm versus 110 mOhm) and increased current capacity (5A versus 3.4A). These improvements are backward-compatible with applications designed for the original part, as the substitute operates within the same electrical and thermal envelope.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection. The substitute's compact footprint (30mm x 21mm versus 37mm x 26mm) and reduced height (35mm versus 45mm) may provide additional benefits in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the 744825410 be used as a direct replacement for the 744866103?

A: Yes. Both parts maintain identical inductance (10 mH @ 10 kHz), line configuration (2-line), filter type (power line), mounting method (through hole), and package format (vertical, 4 PC pin). Electrical and thermal operating ranges are equivalent.

Q: What are the key differences between these parts?

A: The 744825410 offers improved electrical performance with 50% lower DC resistance (55 mOhm versus 110 mOhm) and higher current capacity (5A versus 3.4A). The substitute also features a more compact physical footprint and carries active product status compared to the obsolete 744866103.

Q: Are there any compatibility concerns with PCB layout or mounting?

A: The 744825410 maintains the same through-hole pin configuration and vertical mounting orientation. However, the reduced physical dimensions (30mm x 21mm versus 37mm x 26mm) and lower height (35mm versus 45mm) may require PCB layout verification to ensure adequate clearance and component spacing.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the 744866103 and 744825410 are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for component selection.

Q: Why is the 744866103 listed as obsolete?

A: The 744866103 belongs to the WE-FCL series, which has been superseded by the WE-CMB series. The 744825410 represents the current generation equivalent with improved specifications and ongoing manufacturing support.