Würth Elektronik 744902139 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744902139 is a 39 nH unshielded thin film inductor rated for 200 mA with a maximum DC resistance of 3 Ohm, packaged in 0603 (1608 Metric) surface mount format. This component is classified as obsolete, necessitating identification of active substitute parts that maintain electrical and mechanical compatibility for continued system support and new design implementations.

Substiute Parts

744902139

Würth ElektronikIn Stock: 1175744902139 Datasheet

Current PartRFQ

744761139C

Würth ElektronikIn Stock: 2012744761139C Datasheet

DirectRFQ

744786139A

Würth ElektronikIn Stock: 18090744786139A Datasheet

DirectRFQ

LTF0603GT39N

Stackpole Electronics IncIn Stock: 792LTF0603GT39N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 744902139 are qualified based on the following criteria:

• Inductance Value: Exact match at 39 nH
• Package / Case: Identical 0603 (1608 Metric) surface mount format
• Shielding Type: Unshielded configuration
• Operating Temperature Range: Minimum coverage of -40°C ~ 125°C
• RoHS Compliance: ROHS3 Compliant status
• Mounting Type: Surface mount compatibility

The substitute parts listed below meet these core electrical and mechanical requirements, though individual specifications for current rating, DC resistance, and other performance characteristics vary based on inductor construction type.

Parameter Comparison

Engineering Selection Recommendations

744761139C (Würth Elektronik WE-KI Series)

This substitute provides active product status with higher current rating (600 mA) and significantly lower DC resistance (210 mOhm Max) compared to the main part. The drum core, wirewound construction offers improved performance characteristics. ROHS3 compliance and -40°C ~ 125°C operating temperature range maintain regulatory and thermal compatibility. Suitable for applications requiring enhanced current handling capacity.

744786139A (Würth Elektronik WE-MK Series)

This substitute delivers active product status with intermediate current rating (400 mA) and moderate DC resistance (700 mOhm Max). The multilayer ceramic construction provides AEC-Q200 automotive qualification, extending the operating temperature range to -55°C ~ 125°C. ROHS3 compliance is maintained. Recommended for automotive and extended temperature applications.

LTF0603GT39N (Stackpole Electronics Inc)

This substitute provides active product status from an alternative manufacturer with 2% tolerance matching the main part specification. Limited electrical parameter documentation requires verification against specific application requirements. ROHS3 compliance status and detailed current/resistance specifications are not provided in available data.

Frequently Asked Questions (FAQ)

Q: Can 744761139C replace 744902139 in all applications?

A: 744761139C maintains identical inductance (39 nH), package format (0603), and operating temperature range. However, the significantly lower DC resistance (210 mOhm vs 3 Ohm) and higher current rating (600 mA vs 200 mA) indicate different electrical characteristics. Verification against circuit requirements is necessary before substitution.

Q: What is the primary difference between the substitute parts?

A: The three substitutes differ in construction type (drum core wirewound, multilayer ceramic, and unspecified), current ratings (600 mA, 400 mA, and unspecified), and DC resistance values (210 mOhm, 700 mOhm, and unspecified). All maintain the 39 nH inductance and 0603 package format.

Q: Is 744786139A suitable for automotive applications?

A: Yes. 744786139A carries AEC-Q200 automotive qualification and extends the operating temperature range to -55°C ~ 125°C, making it suitable for automotive environments.

Q: Why does the main part show obsolete status?

A: The 744902139 is classified as obsolete by the manufacturer. The listed substitutes are active products that maintain core electrical and mechanical compatibility while offering continued availability and support.

Q: Are all substitutes ROHS3 compliant?

A: Würth Elektronik parts 744761139C and 744786139A are confirmed ROHS3 compliant. LTF0603GT39N compliance status is not specified in available documentation.

Q: Can package dimensions vary between substitutes?

A: All substitutes use the 0603 (1608 Metric) package format. However, seated height varies: 744902139 (0.022"), 744761139C (0.043"), and 744786139A (0.037"). Verify PCB layout clearance requirements before substitution.