Würth Elektronik 744770282 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744770282 is a 820 µH shielded drum core wirewound inductor rated for 600 mA continuous current with a maximum DC resistance of 1.64Ohm. This surface mount component is designed for applications requiring stable inductance values in compact form factors. The part is actively manufactured and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory constraints, lead time considerations, or specific application requirements that demand alternative electrical or mechanical characteristics within acceptable tolerance ranges.

Substiute Parts

744770282

Würth ElektronikIn Stock: 1166744770282 Datasheet

Current PartRFQ

SRR1280-821K

Bourns Inc.In Stock: 3233SRR1280-821K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. SRR1280-821K qualifies as a direct substitute based on the following critical parameters:

Matching Parameters:

• Inductance value: 820 µH (identical)
• Core type: Ferrite shielded drum core wirewound (identical)
• Mounting: Surface mount (identical)
• Operating temperature range: -40°C to 125°C (identical)
• Package classification: Nonstandard (identical)
• RoHS3 compliance: Yes (identical)

Acceptable Variations:

• Current rating: 700 mA (substitute) vs. 600 mA (main part) — substitute exceeds minimum requirement
• Saturation current: 940 mA (substitute) vs. 800 mA (main part) — substitute provides higher margin
• DC resistance: 1.5Ohm Max (substitute) vs. 1.64Ohm Max (main part) — substitute is lower, acceptable for most applications
• Inductance tolerance: ±10% (substitute) vs. ±20% (main part) — substitute offers tighter tolerance
• Self resonant frequency: 1.4 MHz (substitute) vs. 2 MHz (main part) — minor variation within acceptable range

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 744770282 and Bourns Inc. SRR1280-821K are active products with ROHS3 compliance and identical operating temperature specifications. The Bourns substitute provides equivalent or superior electrical performance across all critical parameters: higher current rating, higher saturation current, lower DC resistance, and tighter inductance tolerance. Both components are surface mount nonstandard packages suitable for identical PCB layouts. Selection between these parts should be based on availability, lead time, and cost considerations, as electrical performance is equivalent or improved with the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRR1280-821K directly replace the Würth Elektronik 744770282 in existing designs?

A: Yes. Both inductors share identical inductance values, core materials, shielding, operating temperature ranges, and mounting types. The substitute part meets or exceeds all electrical specifications of the main part.

Q: What is the significance of the inductance tolerance difference?

A: The Würth part specifies ±20% tolerance while the Bourns substitute specifies ±10%. Tighter tolerance in the substitute part provides more predictable inductance values across production batches, which may benefit applications with strict frequency or impedance requirements.

Q: How do the DC resistance values affect circuit performance?

A: The Bourns substitute has lower maximum DC resistance (1.5Ohm vs. 1.64Ohm). Lower resistance reduces power dissipation and heat generation in the inductor, which is beneficial for efficiency-sensitive applications.

Q: Are there any package or footprint differences between these parts?

A: Both parts are classified as nonstandard packages. The Würth part measures 12.00mm x 12.00mm x 8.00mm (max height), while the Bourns part measures 12.50mm x 12.50mm x 8.00mm (max height). Verify PCB layout compatibility before substitution.

Q: What is the difference in saturation current ratings?

A: The Würth part saturates at 800 mA while the Bourns substitute saturates at 940 mA. The higher saturation current in the substitute provides greater headroom above the 600 mA continuous rating, reducing the risk of inductor saturation in transient conditions.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the Würth Elektronik 744770282 and Bourns SRR1280-821K are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS codes.