0805-271J Equivalent & Substitute Parts

Part Overview

The 0805-271J is a 270 nH unshielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 350 mA and maximum DC resistance of 1 Ohm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 125°C and is non-RoHS compliant.

Substiute Parts

0805-271J

API Delevan Inc.In Stock: 12080805-271J Datasheet

Current PartRFQ

CW201212-R27J

Bourns Inc.In Stock: 3573CW201212-R27J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0805-271J is determined by the following critical parameters:

• Inductance Value: Must be 270 nH with ±5% tolerance
• Core Material & Type: Ceramic drum core, wirewound construction
• Shielding Configuration: Unshielded
• Mounting Technology: Surface mount
• Operating Temperature Range: -40°C to 125°C minimum
• Package Classification: 0805 (2012 Metric) form factor

The substitute part CW201212-R27J from Bourns Inc. satisfies all primary substitution criteria. While the current rating differs (250 mA vs. 350 mA) and DC resistance is higher (1.46 Ohm vs. 1 Ohm max), these parameters remain within acceptable operational margins for equivalent circuit functionality at the specified inductance value and frequency characteristics.

Parameter Comparison

Engineering Selection Recommendations

The CW201212-R27J represents the primary substitute for the obsolete 0805-271J. Selection of this alternative is supported by the following factors:

Product Status: The 0805-271J is classified as obsolete, whereas the CW201212-R27J maintains active production status, ensuring long-term availability and supply chain stability.

Regulatory Compliance: The CW201212-R27J is ROHS3 compliant, addressing modern regulatory requirements. The original 0805-271J is non-compliant, making the substitute preferable for new designs and updated production runs.

Electrical Equivalence: Both components share identical inductance values (270 nH) and tolerance specifications (±5%), with matching operating temperature ranges and core material composition. The substitute exhibits superior self-resonant frequency (850 MHz vs. 650 MHz), extending usable bandwidth.

Current Rating Consideration: The substitute part carries a 250 mA current rating compared to the original 350 mA specification. Circuit designs operating at or below 250 mA continuous current are directly compatible. Applications requiring the full 350 mA rating require circuit-level evaluation.

DC Resistance Trade-off: The substitute exhibits 1.46 Ohm DC resistance versus the original 1 Ohm maximum. This 0.46 Ohm differential introduces proportional power dissipation increase in high-current applications and must be factored into thermal management calculations.

Frequently Asked Questions (FAQ)

Q: Can the CW201212-R27J directly replace the 0805-271J in all applications?

A: Direct replacement is valid for circuits operating at 250 mA or below. Applications requiring the full 350 mA current rating require circuit analysis to confirm the 250 mA limit is not exceeded. The increased DC resistance (1.46 Ohm vs. 1 Ohm) introduces additional power dissipation that must be evaluated in thermal-sensitive designs.

Q: What is the significance of the package designation difference (Nonstandard vs. 0805 Metric)?

A: The 0805-271J uses a nonstandard package, while the CW201212-R27J conforms to the standard 0805 (2012 Metric) form factor. Both are surface mount components with compatible footprints for standard PCB assembly processes. The standardized package of the substitute improves design flexibility and manufacturing consistency.

Q: How do the Q factor and self-resonant frequency differences affect circuit performance?

A: The CW201212-R27J exhibits a Q factor of 45 at 250 MHz (versus 48 for the original) and a higher self-resonant frequency of 850 MHz (versus 650 MHz). These characteristics indicate slightly lower losses at the test frequency and extended usable bandwidth. For most RF and high-frequency applications, the substitute provides equivalent or superior performance.

Q: Is the RoHS compliance difference important for my application?

A: The CW201212-R27J is ROHS3 compliant, while the 0805-271J is non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, the substitute is the appropriate choice. For legacy systems without such requirements, both parts are functionally equivalent from an electrical standpoint.

Q: What inventory considerations apply to this substitution?

A: The 0805-271J is obsolete with limited remaining stock (1126 pcs). The CW201212-R27J is in active production with robust inventory availability (3560 pcs reported). For new designs or production continuity, the active substitute is strongly preferred.