0805-331K Equivalent & Substitute Parts

Part Overview

The 0805-331K is a 330 nH unshielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 310 mA and a maximum DC resistance of 1.4Ohm. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design work, legacy system support, and supply chain continuity.

Substiute Parts

0805-331K

API Delevan Inc.In Stock: 11310805-331K Datasheet

Current PartRFQ

CW201212-R33J

Bourns Inc.In Stock: 5863CW201212-R33J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components must maintain electrical compatibility within the specified application. The primary criteria for substitution are:

Critical Match Parameters:

• Inductance value: 330 nH (exact match)
• Core type: Ceramic drum core, wirewound
• Shielding: Unshielded
• Mounting type: Surface mount (0805/2012 metric equivalent)
• Operating temperature range: -40°C to 125°C (minimum requirement)

Acceptable Variation Parameters:

• Current rating: The substitute must support the circuit's maximum current requirement
• DC resistance: Lower resistance values are acceptable; higher values require circuit analysis
• Inductance tolerance: Both ±10% and ±5% tolerances are acceptable
• Physical dimensions: Within standard 0805 (2012 metric) package specifications
• Q factor and self-resonant frequency: Within acceptable RF performance bounds

The CW201212-R33J qualifies as a substitute based on matching inductance value, core material, unshielded configuration, and compatible package footprint, with lower current rating requiring application-specific verification.

Parameter Comparison

Engineering Selection Recommendations

The CW201212-R33J from Bourns Inc. is the identified substitute for the obsolete 0805-331K. Key selection factors include:

Compliance and Availability: The CW201212-R33J is actively produced and ROHS3 compliant, addressing the non-compliance status of the original component. Inventory availability (5,767 pcs) ensures supply chain continuity.

Electrical Compatibility: Both components share identical 330 nH inductance values and ceramic drum core construction with unshielded configuration. Operating temperature ranges are identical (-40°C to 125°C).

Current Rating Consideration: The substitute component has a lower current rating (200 mA versus 310 mA). Selection requires verification that circuit maximum current does not exceed 200 mA. If the application requires the full 310 mA rating, alternative substitutes must be evaluated.

Physical Footprint: The CW201212-R33J dimensions (2.10mm L x 1.50mm W x 1.50mm H) are slightly smaller than the original (2.29mm L x 1.73mm W x 1.52mm H), maintaining compatibility with standard 0805 (2012 metric) PCB layouts.

Performance Parameters: The substitute exhibits improved inductance tolerance (±5% vs ±10%) and higher self-resonant frequency (800 MHz vs 600 MHz), suitable for RF applications. Q factor differential (45 vs 48 at 250MHz) is negligible for most circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the CW201212-R33J directly replace the 0805-331K without circuit modifications? A: Direct replacement is possible for applications operating at or below 200 mA. Circuits requiring the full 310 mA rating of the original component require current capability verification or alternative component selection.

Q: What is the significance of the inductance tolerance difference (±10% vs ±5%)? A: The CW201212-R33J provides tighter tolerance control. Both values fall within acceptable substitution parameters; the improved tolerance of the Bourns component offers superior consistency in mass production environments.

Q: Are there package compatibility concerns with the slightly smaller physical dimensions? A: No. Both components use the 0805 (2012 metric) surface mount package. The dimension variation (2.29mm to 2.10mm length, 1.73mm to 1.50mm width) remains within standard 0805 specifications and presents no PCB layout or assembly issues.

Q: What is the impact of the higher self-resonant frequency on circuit performance? A: The CW201212-R33J self-resonant frequency (800 MHz) exceeds the original (600 MHz), extending the usable frequency range. This improvement is beneficial for RF and high-frequency applications without introducing compatibility concerns.

Q: Why should the RoHS compliance difference matter in component selection? A: ROHS3 compliance of the CW201212-R33J addresses regulatory requirements in many markets and manufacturing environments. The non-compliant status of the obsolete 0805-331K may restrict use in regulated applications or require documented exemptions.

Q: What is the DC resistance impact of 1.65 Ohm versus 1.4 Ohm? A: The 0.25 Ohm increase in DC resistance of the substitute introduces minimal power dissipation changes in typical applications. Circuit-level analysis is required only for applications with tight power budget constraints or high continuous current operation near the 200 mA rating.