Würth Elektronik 744771239 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744771239 is a 390 µH shielded drum core wirewound inductor rated for 680 mA continuous current with a maximum DC resistance of 690 mOhm. This surface mount component is designed for applications requiring stable inductance values with ferrite core shielding in compact nonstandard packages. The part is active in production and AEC-Q200 rated, making it suitable for automotive and industrial applications. Equivalent parts may be required due to inventory constraints, design flexibility, or specific performance requirements within the defined electrical and mechanical parameters.

Substiute Parts

744771239

Würth ElektronikIn Stock: 1484744771239 Datasheet

Current PartRFQ

SRR1260-391K

Bourns Inc.In Stock: 1773SRR1260-391K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. SRR1260-391K qualifies as a direct substitute based on the following critical parameters:

• Inductance value: 390 µH (identical)
• Core type: Ferrite shielded drum core (identical)
• Mounting: Surface mount (identical)
• Operating temperature range: -40°C to 125°C (identical)
• Self resonant frequency: 2.8 MHz (identical)
• RoHS3 compliance: Yes (identical)
• Packaging: Tape & Reel (identical)

The SRR1260-391K demonstrates improved electrical performance with higher current rating (1.08 A vs. 680 mA) and comparable DC resistance (700 mOhm max vs. 690 mOhm max), making it suitable for applications where the original part is unavailable or where enhanced current capacity is beneficial within the same form factor constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744771239 and Bourns SRR1260-391K are active production components with ROHS3 compliance and REACH unaffected status, qualifying them for equivalent use in regulated applications. The SRR1260-391K offers tighter inductance tolerance (±10% vs. ±20%) and higher current rating capacity, providing design margin in applications approaching the original part's current limits. Physical dimensions differ slightly, with the Bourns part measuring 0.5mm larger in length and width and 0.5mm greater in height. Both components maintain identical operating temperature ranges and self resonant frequency characteristics, ensuring functional equivalence in frequency-dependent circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRR1260-391K be used as a direct replacement for the Würth Elektronik 744771239?

A: Yes. Both parts share identical inductance values (390 µH), core materials (ferrite shielded), operating temperature ranges (-40°C to 125°C), and self resonant frequencies (2.8 MHz). Surface mount packaging and RoHS3 compliance are identical. Physical dimensions differ by 0.5mm in length, width, and height; PCB layout verification is required for space-constrained applications.

Q: What are the key differences between these two inductors?

A: The Bourns part provides higher current rating (1.08 A vs. 680 mA), tighter inductance tolerance (±10% vs. ±20%), and marginally higher DC resistance (700 mOhm vs. 690 mOhm max). The Würth part is slightly more compact (12.00mm vs. 12.50mm footprint, 6.00mm vs. 6.50mm height).

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The Würth part carries AEC-Q200 rating; the Bourns part does not list this certification in the provided data. Applications requiring AEC-Q200 qualification should confirm Bourns certification status independently.

Q: What inductance tolerance should be expected in circuit design?

A: The Würth part tolerates ±20% variation, while the Bourns part tolerates ±10%. For circuits sensitive to inductance accuracy, the Bourns SRR1260-391K provides superior tolerance performance.

Q: Are these parts suitable for high-frequency applications?

A: Both inductors maintain a self resonant frequency of 2.8 MHz, establishing the upper frequency limit for linear operation. Applications above this frequency will experience resonant effects and reduced inductance.