Equivalent & Substitute Parts for 0805-39NK

Part Overview

The API Delevan Inc. 0805-39NK is a 39 nH unshielded drum core wirewound inductor rated for 500 mA with a maximum DC resistance of 290 mOhm. This component is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement. The part is designed for surface mount applications in the nonstandard 0805 package format with ceramic core construction and operates across the -40°C to 125°C temperature range.

Substiute Parts

0805-39NK

API Delevan Inc.In Stock: 10290805-39NK Datasheet

Current PartRFQ

CW201212-39NG

Bourns Inc.In Stock: 1138CW201212-39NG Datasheet

DirectRFQ

CW201212-39NJ

Bourns Inc.In Stock: 2290CW201212-39NJ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0805-39NK are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value of 39 nH (exact match required)
• Current rating of 500 mA or greater
• DC resistance within acceptable operating limits
• Frequency response characteristics (Q @ 500MHz, self-resonant frequency)
• Operating temperature range of -40°C to 125°C

Mechanical Compatibility Criteria:

• Unshielded drum core wirewound construction
• Ceramic core material
• Surface mount mounting type
• Dimensional compatibility with 0805 metric packaging

The two identified substitutes (CW201212-39NG and CW201212-39NJ) from Bourns Inc. meet these core requirements with improved DC resistance specifications and active product status. Both maintain the 39 nH inductance, 500 mA current rating, ceramic unshielded construction, and compatible thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

Both CW201212-39NG and CW201212-39NJ serve as functional equivalents to the obsolete 0805-39NK. The primary differentiators are:

CW201212-39NG features the tightest tolerance specification at ±2% and is packaged in Tape & Reel format. This part provides superior inductance accuracy for applications requiring tight component specifications.

CW201212-39NJ offers a ±5% tolerance with higher inventory availability (2181 units in stock). This part is suitable for applications where moderate tolerance levels are acceptable.

Both substitutes deliver measurable improvements over the original part:

• Reduced DC resistance (180 mOhm versus 290 mOhm maximum) for lower power dissipation
• Active product status ensuring long-term availability and supply chain continuity
• ROHS3 compliance addressing modern regulatory requirements
• Standardized 0805 (2012 Metric) package for improved manufacturing compatibility

Frequently Asked Questions (FAQ)

Q: Can CW201212-39NG or CW201212-39NJ directly replace the 0805-39NK in existing designs?

A: Both Bourns substitutes meet the core electrical requirements (39 nH inductance, 500 mA current rating, ceramic unshielded construction, and compatible operating temperature range). The primary consideration is physical package compatibility, as the substitute parts use standardized 0805 (2012 Metric) packaging rather than the original nonstandard package. Layout adjustments may be required to accommodate dimensional differences.

Q: How do tolerance specifications affect part selection?

A: The original 0805-39NK specifies ±10% tolerance, while CW201212-39NG offers ±2% and CW201212-39NJ offers ±5%. The tighter tolerance of CW201212-39NG is advantageous for high-frequency or precision tuned circuit applications. CW201212-39NJ provides adequate tolerance for general-purpose filtering and impedance matching applications.

Q: What is the impact of lower DC resistance in the substitute parts?

A: Both CW201212-39NG and CW201212-39NJ specify 180 mOhm DC resistance compared to the original 290 mOhm maximum. The lower resistance reduces power dissipation and improves thermal performance, providing a margin of safety in current handling at 500 mA operation.

Q: Are there regulatory compliance differences between the main part and substitutes?

A: Yes. The 0805-39NK is RoHS non-compliant, while both CW201212-39NG and CW201212-39NJ are ROHS3 compliant. Systems designed under modern environmental standards require ROHS3 compliant components. This certification change is a substantial advantage for new designs or system revisions.

Q: How do the self-resonant frequency values compare?

A: The 0805-39NK specifies a 2 GHz self-resonant frequency, while both Bourns substitutes operate at 2.1 GHz. This slight improvement in higher frequency performance may benefit applications operating near the frequency boundaries of the original specification.