CS321613-3R9K Equivalent & Substitute Parts

Part Overview

The CS321613-3R9K is a 3.9 µH shielded multilayer inductor manufactured by Bourns Inc., designed for surface mount applications in the 1206 (3216 Metric) package. This component is rated for 50 mA maximum current with 800mOhm maximum DC resistance and operates across the temperature range of -55°C to 125°C. The part is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

CS321613-3R9K

Bourns Inc.In Stock: 1017CS321613-3R9K Datasheet

Current PartRFQ

AIML-1206-3R9K-T

Abracon LLCIn Stock: 940AIML-1206-3R9K-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS321613-3R9K is determined by strict equivalence across the following critical parameters:

• Inductance Value: Must be 3.9 µH with ±10% tolerance
• Current Rating: Must support minimum 50 mA
• Package / Case: Must be 1206 (3216 Metric) for mechanical and electrical compatibility
• Shielding: Must be shielded to maintain electromagnetic isolation
• Core Material: Ferrite core construction
• Operating Temperature Range: Must cover -55°C to 125°C minimum
• Mounting Type: Surface mount configuration required

The AIML-1206-3R9K-T from Abracon LLC meets all substitution criteria. While the DC resistance specification differs (700mOhm Max versus 800mOhm Max), this represents an improvement in performance characteristics and does not compromise circuit functionality.

Parameter Comparison

Engineering Selection Recommendations

The AIML-1206-3R9K-T is a direct functional equivalent for the obsolete CS321613-3R9K. Both components are ROHS3 compliant and carry MSL Level 1 rating, indicating identical environmental handling requirements. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The lower DC resistance of the AIML-1206-3R9K-T (700mOhm Max versus 800mOhm Max) represents a performance enhancement that reduces power dissipation in the inductor. This characteristic is beneficial for thermal management and does not introduce any compatibility concerns for circuits designed around the original specification.

Frequently Asked Questions (FAQ)

Q: Can the AIML-1206-3R9K-T be used as a direct replacement for the CS321613-3R9K?

A: Yes. Both components share identical inductance values (3.9 µH), current ratings (50 mA), package dimensions (1206 / 3216 Metric), and operating temperature ranges (-55°C to 125°C). The substitute part meets or exceeds all electrical specifications of the original component.

Q: What is the significance of the different DC resistance values?

A: The AIML-1206-3R9K-T has a maximum DC resistance of 700mOhm compared to 800mOhm for the CS321613-3R9K. Lower DC resistance reduces resistive losses and heat generation, which is advantageous for circuit performance. This difference does not affect substitution compatibility.

Q: Are there any packaging differences between these parts?

A: Both components use the 1206 (3216 Metric) surface mount package. Physical dimensions are equivalent: 0.126" L x 0.063" W (3.20mm x 1.60mm). The AIML-1206-3R9K-T has a slightly lower seated height (0.055" / 1.40mm versus 0.059" / 1.50mm), which may provide minor benefits in space-constrained applications.

Q: What compliance certifications apply to both parts?

A: Both the CS321613-3R9K and AIML-1206-3R9K-T are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited) ratings. The AIML-1206-3R9K-T additionally carries REACH Unaffected status. Both parts are classified under ECCN EAR99 and HTSUS 8504.50.8000.

Q: Is the substitute part available in the same packaging format?

A: The AIML-1206-3R9K-T is supplied in Tape & Reel (TR) packaging, which is standard for high-volume surface mount production. The original CS321613-3R9K packaging format is not specified in the available data.