Bourns 5900-123 Equivalent & Substitute Parts

Part Overview

The Bourns 5900-123 is a 12 mH unshielded drum core wirewound inductor rated for 220 mA with a maximum DC resistance of 8.5 Ohm, designed for through-hole axial mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

5900-123

Bourns Inc.In Stock: 8975900-123 Datasheet

Current PartRFQ

4590-126K

DelevanIn Stock: 8664590-126K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Bourns 5900-123 is determined by the following critical parameters:

• Inductance Value: Must be 12 mH with ±10% tolerance
• Core Type: Ferrite drum core construction
• Shielding Configuration: Unshielded
• Mounting Interface: Through-hole axial package
• Current Handling: Minimum 220 mA rating required
• DC Resistance: Maximum 8.5 Ohm acceptable for circuit performance
• Operating Temperature: Minimum -55°C to 105°C range

The Delevan 4590-126K meets these substitution criteria with matching inductance, core material, shielding type, and mounting configuration. Physical dimensions remain within acceptable tolerance for axial through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

The Delevan 4590-126K serves as a direct functional substitute for the obsolete Bourns 5900-123. Both components share identical inductance specifications, core material, and mounting configuration. The Delevan part offers improved current rating capacity (265 mA versus 220 mA) and extended operating temperature range (-55°C to 125°C versus -55°C to 105°C), providing enhanced performance margins in thermal environments.

DC resistance differential (9.34 Ohm maximum versus 8.5 Ohm maximum) represents a 0.84 Ohm increase and must be evaluated within circuit design tolerances. Both components maintain RoHS non-compliant status and are unaffected by REACH regulations.

Frequently Asked Questions (FAQ)

Q: Can the Delevan 4590-126K replace the Bourns 5900-123 in existing designs?

A: Yes. Both inductors share matching 12 mH inductance values, ferrite core construction, unshielded configuration, and through-hole axial mounting. Physical dimensions are equivalent within manufacturing tolerance.

Q: What is the impact of the higher DC resistance in the Delevan part?

A: The Delevan 4590-126K exhibits 9.34 Ohm maximum DC resistance compared to 8.5 Ohm in the Bourns part. This 0.84 Ohm difference affects power dissipation and voltage drop calculations. Circuit validation is required to confirm acceptability within design specifications.

Q: Are there temperature rating differences between these parts?

A: The Delevan part operates across -55°C to 125°C, extending 20°C above the Bourns specification of -55°C to 105°C. This provides additional thermal margin for high-temperature applications.

Q: Do both parts have identical saturation current ratings?

A: No. The Bourns 5900-123 specifies 240 mA saturation current, while the Delevan 4590-126K specifies 170 mA. Applications requiring saturation margin above 170 mA must account for this difference.

Q: Are packaging and mounting footprints compatible?

A: Yes. Both components use through-hole axial mounting with equivalent physical dimensions (approximately 0.45" diameter × 0.90" length). PCB layout modifications are not required.