0805-39NJ Equivalent & Substitute Parts

Part Overview

The 0805-39NJ is a 39 nH unshielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 500 mA with a maximum DC resistance of 290mOhm. The part is classified as obsolete, necessitating identification of active alternative components that maintain functional equivalence for direct replacement in surface mount applications.

Key Parameters

Parameter	Value
Inductance	39 nH
Current Rating	500 mA
DC Resistance (DCR)	290mOhm Max
Tolerance	±5%
Shielding	Unshielded
Q @ Frequency	60 @ 500MHz
Self Resonant Frequency	2GHz
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Package	0805 (2015 Metric)
Size	0.090" L x 0.068" W (2.29mm x 1.73mm)
Height - Seated (Max)	0.060" (1.52mm)

Substitute Part Grouping Explanation

Substitution of the obsolete 0805-39NJ is based on strict equivalence across the following critical parameters: inductance value (39 nH), current rating (500 mA), operating temperature range (-40°C ~ 125°C), shielding configuration (unshielded), mounting type (surface mount), and physical package compatibility (0805 form factor).

Identified substitutes maintain these core electrical and mechanical specifications. DC resistance variation is permissible where the substitute specification does not exceed the maximum operational requirements of the original application. Tolerance, Q factor, and self-resonant frequency are secondary parameters that may vary within acceptable bounds for general high-frequency inductor applications at the specified operating frequency.

Parameter Comparison

Parameter	0805-39NJ (API Delevan)	36502A39NJTDG (TE Connectivity)	CW201212-39NJ (Bourns)	CW201212-39NG (Bourns)
Manufacturer	API Delevan Inc.	TE Connectivity Passive Product	Bourns Inc.	Bourns Inc.
Inductance	39 nH	39 nH	39 nH	39 nH
Tolerance	±5%	±5%	±5%	±2%
Current Rating (Amps)	500 mA	500 mA	500 mA	500 mA
DC Resistance (DCR)	290mOhm Max	290mOhm Max	180mOhm	180mOhm
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Q @ Freq	60 @ 500MHz	60 @ 500MHz	60 @ 500MHz	60 @ 500MHz
Frequency - Self Resonant	2GHz	2GHz	2.1GHz	2.1GHz
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Type	Drum Core, Wirewound	Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Package / Case	Nonstandard	0805 (2015 Metric)	0805 (2012 Metric)	0805 (2012 Metric)
Size / Dimension	0.090" L x 0.068" W (2.29mm x 1.73mm)	0.090" L x 0.068" W (2.29mm x 1.73mm)	0.083" L x 0.059" W (2.10mm x 1.50mm)	0.083" L x 0.059" W (2.10mm x 1.50mm)
Height - Seated (Max)	0.060" (1.52mm)	0.060" (1.52mm)	0.059" (1.50mm)	0.059" (1.50mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The 36502A39NJTDG (TE Connectivity) provides electrical and mechanical equivalence to the 0805-39NJ, maintaining identical inductance, current rating, DC resistance specification, operating temperature range, and physical dimensions. This component carries AEC-Q200 qualification and ROHS3 compliance, establishing it as the primary active replacement.

The CW201212-39NJ and CW201212-39NG (Bourns) are functionally compatible alternatives, offering equivalent inductance, current rating, and operating temperature specifications. Both feature improved DC resistance performance (180mOhm vs. 290mOhm maximum) and slightly elevated self-resonant frequency (2.1GHz vs. 2GHz). Physical dimensions are marginally reduced, with no impact on standard 0805 footprint compatibility. Both achieve ROHS3 compliance. The CW201212-39NG provides tighter tolerance (±2% vs. ±5%) if inductance precision is critical to the application.

Frequently Asked Questions (FAQ)

Q: Can the 36502A39NJTDG directly replace the 0805-39NJ? A: Yes. The 36502A39NJTDG maintains identical electrical specifications for inductance, current rating, DC resistance, operating temperature, and physical dimensions, with superior product status (active) and regulatory compliance (ROHS3).

Q: What is the difference in DC resistance between substitute parts? A: The 0805-39NJ and 36502A39NJTDG both specify 290mOhm maximum DC resistance. The CW201212-39NJ and CW201212-39NG specify 180mOhm, representing a lower resistance characteristic that does not adversely affect substitution.

Q: Are the Bourns CW201212 series parts compatible with the original package footprint? A: The CW201212-39NJ and CW201212-39NG are standard 0805 (2012 Metric) packages. Physical dimensions are marginally smaller (2.10mm x 1.50mm vs. 2.29mm x 1.73mm), within tolerance for standard 0805 land patterns. Height is functionally equivalent (1.50mm vs. 1.52mm).

Q: Why is the 0805-39NJ classified as obsolete? A: The 0805-39NJ is a nonstandard package variant. Active substitutes utilize standardized 0805 (2012/2015 Metric) package designations with equivalent functional performance.

Q: Which substitute part offers the tightest inductance tolerance? A: The CW201212-39NG offers ±2% tolerance, compared to ±5% for the remaining parts. Selection of this variant is appropriate for applications requiring higher inductance precision.

Q: Do all substitute parts meet modern regulatory compliance? A: The 36502A39NJTDG, CW201212-39NJ, and CW201212-39NG all achieve ROHS3 compliance. The original 0805-39NJ is RoHS non-compliant, requiring substitution in applications subject to RoHS directives.

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