744760239C Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744760239C is a 390 nH unshielded drum core wirewound inductor rated for 290 mA with a maximum DC resistance of 2.1Ohm, packaged in 0805 (2.29mm x 1.70mm) surface mount configuration. This component is designed for high-frequency applications requiring low inductance values with controlled impedance characteristics. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent parts are identified when electrical and mechanical parameters align within acceptable tolerances for the intended application.

Substiute Parts

744760239C

Würth ElektronikIn Stock: 1605744760239C Datasheet

Current PartRFQ

CW201212-R39J

Bourns Inc.In Stock: 4591CW201212-R39J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744760239C is determined by the following critical parameters:

Inductance value must match at 390 nH with ±5% tolerance. Core material must be ceramic with unshielded drum core construction. Mounting configuration must be surface mount in 0805 package format. Operating temperature range must encompass -40°C to 125°C minimum. RoHS3 compliance and REACH unaffected status are required for regulatory equivalence.

The current rating and DC resistance are secondary parameters that define performance boundaries. A substitute part with lower current rating (170 mA versus 290 mA) remains functionally equivalent when the application current requirement does not exceed the substitute's rating. DC resistance variance within 0.1Ohm is acceptable given the ±5% inductance tolerance specification.

Parameter Comparison

Engineering Selection Recommendations

The Bourns CW201212-R39J qualifies as a direct substitute for the Würth Elektronik 744760239C based on matching inductance specification, core construction, package footprint, and regulatory compliance. Both components are ROHS3 compliant, REACH unaffected, and rated for identical operating temperature ranges.

Selection between these parts depends on application current requirements. The 744760239C supports 290 mA continuous current, while the CW201212-R39J is rated for 170 mA. Applications requiring current levels between 170 mA and 290 mA must use the 744760239C. Applications with current requirements below 170 mA accept either part.

The CW201212-R39J exhibits superior high-frequency characteristics with Q factor of 45 at 250 MHz and self-resonant frequency of 780 MHz compared to 35 and 560 MHz respectively for the 744760239C. DC resistance difference of 0.1Ohm (2.2Ohm versus 2.1Ohm) is negligible within the ±5% inductance tolerance specification.

Physical dimensions differ slightly: the Bourns part measures 2.10mm x 1.50mm versus 2.29mm x 1.70mm for the Würth part. Both conform to 0805 package standard and are footprint compatible for surface mount PCB assembly.

Frequently Asked Questions (FAQ)

Q: Can CW201212-R39J replace 744760239C in all applications?

A: Substitution is valid only when application current does not exceed 170 mA. The CW201212-R39J current rating of 170 mA is the limiting factor. Applications requiring 200 mA or higher must use the 744760239C rated for 290 mA.

Q: Are the physical dimensions compatible for PCB layout?

A: Yes. Both parts use 0805 package standard. The Bourns CW201212-R39J (2.10mm x 1.50mm) and Würth 744760239C (2.29mm x 1.70mm) are footprint compatible for surface mount assembly. Slight dimensional variation is within 0805 specification tolerance.

Q: Does the 0.1Ohm DC resistance difference affect circuit performance?

A: No. The 0.1Ohm difference (2.1Ohm versus 2.2Ohm) falls within the ±5% inductance tolerance specification and does not constitute a functional difference for inductor selection purposes.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the 744760239C and CW201212-R39J are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is identical at MSL 1 (unlimited) for both parts.

Q: Which part has better high-frequency performance?

A: The CW201212-R39J exhibits higher Q factor (45 versus 35 at 250 MHz) and higher self-resonant frequency (780 MHz versus 560 MHz). For applications operating near or above 560 MHz, the Bourns part provides superior frequency response characteristics.

Q: Can I use 744760239C as a substitute for CW201212-R39J?

A: Yes. The 744760239C is a direct substitute for CW201212-R39J with the advantage of higher current rating (290 mA versus 170 mA). No electrical or mechanical incompatibility exists.