Bourns 5900-122 Equivalent & Substitute Parts

Part Overview

The Bourns 5900-122 is a 1.2 mH unshielded drum core wirewound inductor rated for 680 mA continuous current with a maximum DC resistance of 910 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 5900-122 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

5900-122

Bourns Inc.In Stock: 10975900-122 Datasheet

Current PartRFQ

4590-125K

API Delevan Inc.In Stock: 11614590-125K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 5900-122 is determined by the following critical parameters:

• Inductance Value: Must match 1.2 mH at 1 kHz test frequency
• Inductance Tolerance: Must be ±10% or tighter
• Core Type and Shielding: Must be ferrite drum core, unshielded construction
• Mounting and Package: Must be through-hole axial configuration
• Physical Dimensions: Must be compatible with 0.453" diameter × 0.900" length envelope
• Current Handling: Substitute must support the application's current requirements without saturation
• DC Resistance: Must not exceed the design's maximum allowable DCR for the application
• Operating Temperature: Must cover the required temperature range

The API Delevan 4590-125K meets these substitution criteria with matching inductance, tolerance, core material, shielding, mounting type, and package configuration. Physical dimensions are within acceptable tolerance. The substitute provides enhanced current rating and extended temperature range, making it suitable for direct replacement in the 5900-122 application.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan 4590-125K is an active product with current manufacturing support, addressing the obsolescence status of the Bourns 5900-122. Both components share identical inductance specifications, tolerance, core material, and package configuration, establishing direct functional equivalence.

The 4590-125K provides a higher continuous current rating (825 mA versus 680 mA), extending operational headroom in current-limited applications. The extended operating temperature range (-55°C to 125°C versus -55°C to 105°C) accommodates broader environmental requirements.

Both components maintain RoHS non-compliant status and are subject to identical trade classifications (ECCN: EAR99). The DC resistance differential (977 mOhm versus 910 mOhm) represents a 7.4% increase and must be evaluated against circuit design tolerances and thermal dissipation requirements.

Physical dimensions are compatible within standard PCB layout tolerances, with diameter variation of 0.002" and identical axial length.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan 4590-125K directly replace the Bourns 5900-122 in existing designs?

A: Yes. Both inductors share identical inductance values (1.2 mH), tolerance (±10%), core material (ferrite), shielding (unshielded), mounting type (through-hole), and package configuration (axial). Physical dimensions are compatible. The substitute provides enhanced current rating and extended temperature range.

Q: What is the significance of the current rating difference between these parts?

A: The 5900-122 is rated for 680 mA continuous current, while the 4590-125K is rated for 825 mA. The substitute provides 145 mA additional current capacity. Applications operating at or near the original 680 mA specification benefit from this margin. Applications exceeding 680 mA require the substitute's higher rating.

Q: How does the saturation current difference affect substitution?

A: The 5900-122 saturates at 760 mA, while the 4590-125K saturates at 510 mA. Saturation current defines the threshold at which inductance begins to degrade. Circuit designs must ensure operating current remains below the applicable saturation specification for the selected component.

Q: Is the DC resistance increase from 910 mOhm to 977 mOhm significant?

A: The 7.4% increase in maximum DC resistance affects power dissipation and circuit performance. Applications with tight thermal budgets or precise impedance requirements must evaluate this differential against design specifications. The increase is within typical component tolerance ranges but should be confirmed against circuit simulation or testing.

Q: Are there compliance or certification differences between these parts?

A: Both components are RoHS non-compliant and share identical trade classifications (ECCN: EAR99, HTSUS codes differ slightly). Compliance requirements for your application must be evaluated independently of substitution eligibility.

Q: What is the physical compatibility of these axial components?

A: Both inductors are axial through-hole components with identical length (0.900"). Diameter differs by 0.002" (11.51mm versus 11.55mm), which is negligible for standard PCB hole tolerances. No mechanical redesign is required for board-level substitution.