Bourns 5900-681 680µH Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 5900-681 is a 680 µH unshielded drum core wirewound inductor rated for 900 mA continuous current with a maximum DC resistance of 515 mOhm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for general-purpose filtering and energy storage applications in electronic circuits.

The 5900-681 carries an obsolete product status. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for legacy systems and new designs requiring compatible inductance characteristics.

Substiute Parts

5900-681

Bourns Inc.In Stock: 7725900-681 Datasheet

Current PartRFQ

5900-681-RC

Bourns Inc.In Stock: 15345900-681-RC Datasheet

DirectRFQ

4590-684K

API Delevan Inc.In Stock: 10654590-684K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Bourns 5900-681 are qualified based on the following critical parameters:

• Inductance Value: 680 µH (exact match required)
• Inductance Tolerance: ±10% (matching tolerance specification)
• Core Material & Type: Ferrite drum core, unshielded construction
• Mounting Configuration: Through-hole axial package
• Current Handling: Minimum 900 mA rating or higher
• DC Resistance: Maximum 515 mOhm or lower (lower DCR preferred for efficiency)
• Operating Temperature: Minimum -55°C to 105°C range coverage
• Physical Form Factor: Axial package compatible with 0.453" diameter and 0.900" length specifications

Substitutes are categorized as direct equivalents (identical specifications with different packaging or compliance status) or similar alternatives (enhanced electrical performance within the same form factor).

Parameter Comparison

Engineering Selection Recommendations

5900-681-RC (Bourns Inc.) is the primary direct substitute for the obsolete 5900-681. This part maintains identical electrical specifications (680 µH, 900 mA, 515 mOhm DCR) and physical dimensions while offering active product status and ROHS3 compliance. The tray packaging format differs from the original bulk packaging but does not affect electrical performance. This substitute is recommended for designs requiring regulatory compliance and long-term supply assurance.

4590-684K (API Delevan Inc.) serves as a similar alternative with enhanced current handling capability (1.08 A versus 900 mA) and extended operating temperature range (-55°C to 125°C versus -55°C to 105°C). The DC resistance specification is slightly higher at 570 mOhm maximum compared to 515 mOhm. Physical dimensions are nominally equivalent (0.455" diameter versus 0.453" diameter). This part is suitable for applications requiring higher current margins or broader temperature operation. The saturation current specification (670 mA) is lower than the main part, requiring evaluation against circuit requirements.

Selection between these substitutes depends on compliance requirements, current margin needs, and temperature operating envelope of the target application.

Frequently Asked Questions (FAQ)

Q: Can the 5900-681-RC be used as a direct replacement for the 5900-681?

A: Yes. The 5900-681-RC maintains identical inductance (680 µH), current rating (900 mA), DC resistance (515 mOhm maximum), and physical dimensions. The primary differences are active product status, ROHS3 compliance, and tray packaging format. Electrical performance is equivalent.

Q: What are the key differences between the 5900-681-RC and 4590-684K?

A: Both parts share the same 680 µH inductance and ±10% tolerance. The 4590-684K offers higher continuous current rating (1.08 A versus 900 mA) and extended temperature range (-55°C to 125°C versus -55°C to 105°C). The 4590-684K has slightly higher DC resistance (570 mOhm versus 515 mOhm) and lower saturation current (670 mA versus 1 A). Physical dimensions are nominally equivalent with minor diameter variation (0.455" versus 0.453").

Q: Is the 4590-684K suitable for applications designed for the 5900-681?

A: The 4590-684K is electrically compatible for most applications. The higher current rating and extended temperature range provide additional operational margin. However, the lower saturation current (670 mA) and slightly higher DC resistance require circuit-level evaluation to confirm suitability for the specific application.

Q: What is the impact of packaging format differences?

A: The 5900-681 and 5900-681-RC differ in packaging (bulk versus tray). This affects handling, storage, and automated assembly processes but does not impact electrical performance or component functionality.

Q: Are there RoHS compliance considerations for substitute selection?

A: The 5900-681-RC is ROHS3 compliant, making it suitable for applications with regulatory compliance requirements. The 4590-684K is RoHS non-compliant. Compliance requirements should drive substitute selection for regulated applications.