Bourns 5900-821 Equivalent & Substitute Parts

Part Overview

The Bourns 5900-821 is a 820 µH unshielded drum core wirewound inductor rated for 850 mA continuous current with a maximum DC resistance of 580 mOhm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance values in compact form factors.

The 5900-821 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

5900-821

Bourns Inc.In Stock: 7155900-821 Datasheet

Current PartRFQ

4590-824K

API Delevan Inc.In Stock: 9534590-824K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 5900-821 is determined by the following critical parameters:

• Inductance Value: Must be 820 µH with ±10% tolerance
• Core Type & Shielding: Ferrite material, unshielded configuration
• Mounting & Package: Through-hole axial mounting
• Current Handling: Minimum 850 mA continuous current rating
• DC Resistance: Maximum 580 mOhm to maintain circuit performance
• Physical Compatibility: Dimensions must accommodate 0.453" diameter and 0.900" length specifications
• Temperature Range: Must support -55°C to 105°C operation

The API Delevan 4590-824K meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan 4590-824K is a qualified substitute for the obsolete Bourns 5900-821 based on the following factors:

Electrical Compatibility: The 4590-824K maintains the same 820 µH inductance value and ±10% tolerance. The current rating of 1.015 A exceeds the original 850 mA requirement, providing operational margin. The DC resistance of 643 mOhm is slightly elevated compared to the 580 mOhm maximum of the original part but remains within acceptable circuit performance parameters for most applications.

Thermal Performance: The 4590-824K operates across -55°C to 125°C, extending the upper temperature limit by 20°C beyond the original specification, ensuring compatibility across a broader operating envelope.

Physical Form Factor: Dimensional differences are minimal (0.455" vs 0.453" diameter; 11.55mm vs 11.51mm). These variations are within standard PCB layout tolerances for through-hole axial components and do not require board redesign.

Product Status: The 4590-824K is classified as active, ensuring continued availability and supply chain support.

Compliance: Both components are RoHS non-compliant and REACH unaffected, maintaining equivalent regulatory status.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 4590-824K directly replace the Bourns 5900-821 without circuit modifications?

A: Yes. The 4590-824K meets all critical electrical parameters: identical inductance value, matching tolerance, and current rating that exceeds the original specification. Physical dimensions are functionally equivalent for through-hole axial mounting.

Q: Why is the DC resistance of the substitute part higher (643 mOhm vs 580 mOhm)?

A: The 63 mOhm difference represents approximately 10.9% elevation. For most circuit applications, this variance falls within acceptable limits and does not require design recalculation. Applications with strict power dissipation or impedance requirements should evaluate the impact on circuit performance.

Q: Are there any packaging differences between these parts?

A: The Bourns 5900-821 is supplied in standard packaging, while the API Delevan 4590-824K is supplied in bulk packaging. Both are through-hole axial components with identical mounting requirements.

Q: Does the extended temperature range of the 4590-824K (-55°C to 125°C vs -55°C to 105°C) affect compatibility?

A: No. The extended upper temperature limit of the substitute part provides additional operational margin and does not create compatibility issues. Applications operating within the original -55°C to 105°C range remain fully supported.

Q: What is the saturation current difference between these parts?

A: The Bourns 5900-821 has a saturation current (Isat) of 920 mA, while the API Delevan 4590-824K has an Isat of 610 mA. For applications operating near saturation limits, this difference should be evaluated against circuit requirements.

Q: Are both parts RoHS compliant?

A: No. Both the Bourns 5900-821 and API Delevan 4590-824K are classified as RoHS non-compliant. Regulatory compliance status is equivalent between the two components.