0603-56NK Equivalent & Substitute Parts Reference

Part Overview

The API Delevan Inc. 0603-56NK is a 56 nH unshielded drum core wirewound inductor rated for 600 mA with a maximum DC resistance of 310mOhm. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The part operates across the temperature range of -40°C to 125°C and is designed for surface mount assembly in compact form factors.

Due to its obsolete status, sourcing equivalent alternatives with matching electrical and mechanical specifications is essential for design continuity and supply chain management.

Key Parameters

Parameter	Value
Inductance	56 nH
Tolerance	±10%
Current Rating	600 mA
DC Resistance (DCR)	310mOhm Max
Shielding	Unshielded
Core Material	Ceramic
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
Self Resonant Frequency	1.9 GHz
Package Type	Nonstandard

Substitute Part Grouping Explanation

Substitution of the 0603-56NK is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Inductance value: 56 nH (tolerance variations acceptable within design margin)
Current rating: 600 mA minimum
DC resistance: 310mOhm maximum
Self resonant frequency: 1.9 GHz
Operating temperature range: -40°C to 125°C minimum
Unshielded configuration

Mechanical Equivalence Criteria:

Surface mount assembly capability
Physical dimensions compatible with 0603 (1608 metric) footprint
Drum core wirewound construction

The substitute part CW160808-56NJ from Bourns Inc. meets all electrical specifications and operates within the defined mechanical constraints, making it a direct functional equivalent despite differences in core material composition and tolerance rating.

Parameter Comparison

Parameter	0603-56NK (API Delevan)	CW160808-56NJ (Bourns)
Inductance	56 nH	56 nH
Tolerance	±10%	±5%
Current Rating (Amps)	600 mA	600 mA
DC Resistance (DCR)	310mOhm Max	310mOhm
Shielding	Unshielded	Unshielded
Core Material	Ceramic	Alumina
Q @ Frequency	38 @ 200MHz	35 @ 250MHz
Self Resonant Frequency	1.9 GHz	1.9 GHz
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	Nonstandard	0603 (1608 Metric)
Size / Dimension	0.071" L x 0.045" W (1.80mm x 1.14mm)	0.065" L x 0.041" W (1.65mm x 1.05mm)
Height - Seated (Max)	0.040" (1.02mm)	0.047" (1.20mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

Primary Substitute: CW160808-56NJ (Bourns Inc.)

The Bourns CW160808-56NJ is the qualified equivalent for the obsolete API Delevan 0603-56NK. Selection of this substitute is supported by the following factors:

Electrical Compatibility: All critical electrical parameters match or exceed the original specification. The substitute maintains identical inductance (56 nH), current rating (600 mA), DC resistance (310mOhm), and self resonant frequency (1.9 GHz). The tighter tolerance (±5% versus ±10%) provides improved performance margin.

Mechanical Compatibility: Both components are surface mount inductors with compatible footprints within the 0603 (1608 metric) family. Physical dimensions are within acceptable variation for PCB assembly processes.

Compliance Status: The CW160808-56NJ holds active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The original part carries RoHS non-compliant status, making the substitute preferable for new designs and ongoing production.

Regulatory Alignment: Both parts share identical ECCN (EAR99) and HTSUS (8504.50.8000) classifications, with matching REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the CW160808-56NJ directly replace the 0603-56NK in existing designs?

A: Yes. The substitute maintains identical inductance value (56 nH), current rating (600 mA), DC resistance (310mOhm maximum), and self resonant frequency (1.9 GHz). Physical dimensions are compatible with 0603 (1608 metric) PCB footprints. Verification of PCB layout clearances for the maximum seated height of 0.047" (1.20mm) is recommended.

Q: What is the significance of the core material difference (Ceramic vs. Alumina)?

A: Both ceramic and alumina are acceptable core materials for unshielded drum core inductors in this specification class. The alumina core in the substitute part does not alter the electrical performance parameters relevant to circuit function. Both materials support the specified operating temperature range and frequency characteristics.

Q: Does the tolerance difference (±10% vs. ±5%) affect circuit performance?

A: The substitute part offers tighter tolerance (±5%), which provides improved inductance accuracy compared to the original ±10% specification. This represents an enhancement rather than a limitation for circuit design.

Q: Are there packaging differences to consider?

A: The original part uses nonstandard packaging, while the substitute is supplied in standard 0603 (1608 metric) tape and reel format. This standardization improves handling, assembly automation compatibility, and supply chain efficiency.

Q: What is the inventory status for the substitute part?

A: The CW160808-56NJ is actively manufactured by Bourns Inc. with 877 pieces currently in stock as new original inventory, ensuring reliable supply availability.

Q: Are there compliance considerations for design transitions?

A: The substitute part carries ROHS3 compliance certification, making it suitable for applications requiring RoHS compliance. The original part is RoHS non-compliant. Both parts maintain identical REACH unaffected and EAR99 ECCN status.

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