0805-121J Equivalent & Substitute Parts

Part Overview

The API Delevan Inc. 0805-121J is a 120 nH unshielded drum core, wirewound inductor rated for 400 mA with a maximum DC resistance of 510 mOhm. This component is currently obsolete, making identification of functional equivalent and substitute parts necessary for ongoing circuit maintenance and design continuity.

Key Parameters

Parameter	Specification
Inductance	120 nH
Current Rating	400 mA
DC Resistance (DCR)	510 mOhm Max
Tolerance	±5%
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	0805 (2012 Metric)
Q @ Frequency	50 @ 250 MHz
Self Resonant Frequency	1.1 GHz

Substitute Part Grouping Explanation

Substitutes for the 0805-121J are grouped by their adherence to the critical electrical parameters that define functional equivalence: inductance value (120 nH), current rating (400 mA), operating temperature range (-40°C ~ 125°C), and mechanical compatibility with 0805 (2012 Metric) package footprints.

The Bourns CW201212-R12G and CW201212-R12J maintain identical inductance and current ratings while offering improved tolerance specifications (±2% and ±5% respectively) compared to the original part. Both feature reduced DC resistance (480 mOhm versus 510 mOhm), representing a performance improvement. The Murata LQW2BASR12J00L provides equivalent electrical characteristics with an extended lower operating temperature limit (-55°C versus -40°C), while matching the original DC resistance specification.

Parameter Comparison

Parameter	API Delevan 0805-121J	Bourns CW201212-R12G	Bourns CW201212-R12J	Murata LQW2BASR12J00L
Manufacturer	API Delevan Inc.	Bourns Inc.	Bourns Inc.	Murata Electronics
Inductance	120 nH	120 nH	120 nH	120 nH
Tolerance	±5%	±2%	±5%	±5%
Current Rating	400 mA	400 mA	400 mA	400 mA
DC Resistance (DCR)	510 mOhm Max	480 mOhm	480 mOhm	510 mOhm Max
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	Nonstandard	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2015 Metric)
Q @ 250 MHz	50	50	50	50
Self Resonant Frequency	1.1 GHz	1.1 GHz	1.1 GHz	1.1 GHz
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both Bourns substitutes (CW201212-R12G and CW201212-R12J) are active products with ROHS3 compliance, offering the advantage of continued manufacturer support and supply chain availability. The CW201212-R12G variant with ±2% tolerance provides superior inductance accuracy for applications with tighter specifications.

The Murata LQW2BASR12J00L remains an active product with ROHS3 compliance and offers an extended operating temperature range to -55°C, providing additional environmental margin for applications requiring operation in cold conditions. This component matches the original part's DC resistance specification exactly.

The obsolete status of the original 0805-121J necessitates transition to one of the active equivalents. Selection between the Bourns and Murata options depends on tolerance requirements, temperature operating range, and established supply chain relationships.

Frequently Asked Questions (FAQ)

Q: What makes the Bourns CW201212-R12G and CW201212-R12J functionally equivalent to the API Delevan 0805-121J? A: All three components maintain the same inductance value (120 nH), current rating (400 mA), operating temperature range (-40°C ~ 125°C maximum), and Q factor (50 @ 250 MHz). The Bourns parts offer equal or improved electrical performance while maintaining mechanical compatibility with 0805 (2012 Metric) footprints.

Q: How does the Murata LQW2BASR12J00L differ from the Bourns substitutes? A: The Murata component features an extended operating temperature range (-55°C minimum versus -40°C), making it suitable for more demanding thermal environments. DC resistance matches the original specification (510 mOhm Max). Physical dimensions vary slightly between the 0805 (2015 Metric) package versus the Bourns 0805 (2012 Metric) variant, though both are mechanically compatible with standard 0805 footprints.

Q: Are these substitutes suitable for direct PCB layout replacement? A: Yes. All substitute parts are Surface Mount components rated for 0805 package footprints, compatible with existing PCB designs for the API Delevan 0805-121J. Minor dimensional variations between 2012 Metric and 2015 Metric packages do not affect standard 0805 land pattern placement.

Q: What is the difference between the CW201212-R12G and CW201212-R12J? A: Both Bourns components provide identical inductance (120 nH), current rating (400 mA), and DC resistance (480 mOhm). The primary difference is tolerance specification: CW201212-R12G offers ±2% tolerance while CW201212-R12J offers ±5% tolerance. Selection depends on application tolerance requirements.

Q: Why is the original API Delevan part obsolete? A: The 0805-121J is listed with obsolete product status. This necessitates transition to active equivalents for new designs or long-term supply continuity. The Bourns and Murata alternatives provide continued support and availability.

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