Würth Elektronik 744204 CMC 250UH 600MA 4LN SMD - Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744204 is a 4-line common mode choke (CMC) designed for signal line filtering applications. This surface mount component provides 250 µH inductance at 100 kHz with a maximum current rating of 600 mA and operates across a temperature range of -40°C to 125°C. The part is actively produced and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Common mode chokes of this specification are essential in applications requiring EMI/RFI suppression on multi-conductor signal paths, making substitute identification critical for supply chain continuity and design flexibility.

Substiute Parts

744204

Würth ElektronikIn Stock: 9587744204 Datasheet

Current PartRFQ

SRF1306-251Y

Bourns Inc.In Stock: 2227SRF1306-251Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 744204 is determined by the following critical parameters:

• Inductance Value: 250 µH (measured at 100 kHz for the main part)
• Current Rating: 600 mA maximum
• Voltage Rating: Minimum 80 V DC for the main part
• Mounting Type: Surface mount configuration
• RoHS Compliance: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

The identified substitute, Bourns Inc. SRF1306-251Y, meets the inductance (250 µH) and current (600 mA) requirements. However, this part functions as a DC EMC/EMI line filter with single-stage configuration and chassis mount termination, differing from the signal line common mode choke architecture of the main part. The substitute operates at a lower maximum DC voltage rating (50 V versus 80 V) and a reduced operating temperature upper limit (-40°C to 105°C versus -40°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744204 and Bourns SRF1306-251Y maintain active production status and achieve ROHS3 compliance with MSL 1 ratings, ensuring regulatory alignment and supply availability. Selection between these components must account for application-specific voltage and temperature requirements. The main part supports 80 V DC operation and extended temperature performance to 125°C, making it suitable for higher-voltage and higher-temperature environments. The substitute part operates within 50 V DC maximum and 105°C upper temperature limit, restricting its use to applications within these constraints. Mounting and termination differences (surface mount gull wing versus chassis mount SMD tab) require PCB layout and mechanical integration verification. Direct substitution is contingent upon application voltage and temperature specifications remaining within the substitute's rated parameters.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRF1306-251Y directly replace the Würth Elektronik 744204 in all applications?

A: No. While both components share 250 µH inductance and 600 mA current ratings, the substitute operates at lower maximum voltage (50 V DC versus 80 V DC) and reduced temperature range (-40°C to 105°C versus -40°C to 125°C). Substitution is valid only when application requirements fall within these lower limits. Additionally, mounting type and termination style differ, requiring PCB design verification.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are inductance value (250 µH), current rating (600 mA), and voltage rating. The substitute meets inductance and current specifications but operates at reduced voltage. Applications exceeding 50 V DC cannot use the substitute. Temperature range compatibility must also be verified for the specific operating environment.

Q: Are there packaging or mounting considerations when substituting these parts?

A: Yes. The main part uses horizontal 8 gull wing surface mount packaging, while the substitute employs SMD (SMT) tab chassis mount termination. These differences require different PCB footprints and mounting approaches. Physical dimensions and board layout must be re-evaluated before substitution.

Q: Do both parts meet the same compliance standards?

A: Both components are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) ratings. Compliance alignment supports substitution from a regulatory perspective, provided electrical and mechanical requirements are satisfied.

Q: What is the functional difference between a signal line common mode choke and a DC EMC/EMI line filter?

A: The main part (744204) is a 4-line common mode choke designed for signal path filtering, while the substitute (SRF1306-251Y) is a single-stage DC line filter for EMC/EMI suppression. These represent different filter architectures and applications. Functional compatibility depends on whether the application requires common mode rejection on multiple signal conductors or single-stage DC line filtering.