CS321613-R18K Equivalent & Substitute Parts

Part Overview

The CS321613-R18K is a 180 nH shielded multilayer inductor manufactured by Bourns Inc., rated for 250 mA with a maximum DC resistance of 200mOhm. This component is packaged in a 1206 (3216 Metric) surface mount form factor and operates across the temperature range of -55°C to 125°C. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

CS321613-R18K

Bourns Inc.In Stock: 1018CS321613-R18K Datasheet

Current PartRFQ

AIML-1206-R18K-T

Abracon LLCIn Stock: 1071AIML-1206-R18K-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS321613-R18K is determined by strict alignment of the following parameters:

• Inductance value: 180 nH (±10% tolerance)
• Current rating: 250 mA minimum
• Shielding type: Shielded construction required
• Core material: Ferrite
• Package: 1206 (3216 Metric) surface mount
• Operating temperature range: -55°C ~ 125°C minimum
• Mounting type: Surface mount

The AIML-1206-R18K-T from Abracon LLC meets all substitution criteria. While the DC resistance specification differs (300mOhm Max versus 200mOhm Max), this represents a relaxation of the original specification and does not prevent functional substitution in applications where the original part's DCR margin is not critical to circuit performance.

Parameter Comparison

Engineering Selection Recommendations

The AIML-1206-R18K-T is a direct functional substitute for the obsolete CS321613-R18K. Both components are ROHS3 compliant and carry MSL Level 1 ratings, ensuring compatibility with standard manufacturing and storage protocols. The Abracon part is currently in active production status, providing supply continuity and long-term availability.

The primary design consideration is the increased DC resistance specification of the substitute (300mOhm Max versus 200mOhm Max). Circuit designers must evaluate whether the additional resistive loss is acceptable within the application's power budget and thermal constraints. The substitute's higher self-resonant frequency (220MHz versus 185MHz) may provide improved high-frequency performance in certain applications.

Frequently Asked Questions (FAQ)

Q: Can the AIML-1206-R18K-T directly replace the CS321613-R18K in existing designs?

A: Yes, the AIML-1206-R18K-T is mechanically and electrically compatible for direct substitution. Both components share identical inductance values, current ratings, package dimensions, and operating temperature ranges. The substitute is pin-compatible and requires no PCB layout modifications.

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

A: The AIML-1206-R18K-T specifies a maximum DC resistance of 300mOhm compared to the original 200mOhm. This 50% increase in DCR will result in proportionally higher resistive losses in the inductor. The practical impact depends on the circuit's current levels and thermal design margins. Applications operating at or near the 250 mA current rating should evaluate the additional power dissipation.

Q: Are there packaging differences between these parts?

A: Both components use the 1206 (3216 Metric) surface mount package. Physical dimensions are nearly identical, with the substitute measuring 0.055" (1.40mm) in seated height compared to 0.059" (1.50mm) for the original. This minor difference does not affect PCB assembly or clearance considerations.

Q: What certifications apply to the substitute part?

A: The AIML-1206-R18K-T is ROHS3 compliant and carries REACH Unaffected status. It maintains MSL Level 1 rating, indicating unlimited shelf life under standard storage conditions. Both parts share identical compliance classifications.

Q: How do the frequency characteristics compare?

A: The substitute exhibits a higher self-resonant frequency (220MHz versus 185MHz) and lower Q factor (30 @ 25MHz versus 50 @ 25MHz). These differences may affect performance in high-frequency filtering or impedance matching applications. Circuit simulation or testing is appropriate when frequency response is critical to application performance.