0805-181K Equivalent & Substitute Parts

Part Overview

The API Delevan Inc. 0805-181K is a 180 nH unshielded drum core wirewound inductor rated for 400 mA with a maximum DC resistance of 640 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is designed for high-frequency applications with a self-resonant frequency of 870 MHz.

The 0805-181K has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductance value and current rating.

Substiute Parts

0805-181K

API Delevan Inc.In Stock: 7540805-181K Datasheet

Current PartRFQ

CW201212-R18J

Bourns Inc.In Stock: 3172CW201212-R18J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0805-181K are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 180 nH (exact match required)
• Core type: Ceramic drum core, wirewound, unshielded
• Mounting: Surface mount configuration
• Operating temperature range: -40°C to 125°C (minimum requirement)
• Frequency characteristics: Q factor and self-resonant frequency within acceptable operating range

Secondary Compatibility Parameters:

• Current rating: Substitute must support the application's current requirements
• DC resistance: Must be compatible with circuit design specifications
• Package classification: 0805 (2012 Metric) standard footprint

The Bourns Inc. CW201212-R18J meets these substitution criteria through matching inductance, core material, mounting type, temperature range, and frequency characteristics. Variations in current rating, DC resistance, and tolerance are within acceptable engineering parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 0805-181K is classified as obsolete, while the CW201212-R18J maintains active product status with current manufacturing support. Selection of the active substitute part ensures long-term supply chain viability and access to technical support.

Compliance and Certification: The CW201212-R18J is ROHS3 compliant, whereas the 0805-181K is non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, the CW201212-R18J is the appropriate selection.

Electrical Parameter Alignment: Both parts share identical inductance values (180 nH), core materials (ceramic), Q factors (50 @ 250 MHz), and operating temperature ranges (-40°C to 125°C). The CW201212-R18J exhibits a lower current rating (350 mA versus 400 mA) and higher DC resistance (850 mOhm versus 640 mOhm maximum). Circuit designs operating at or below 350 mA with acceptable DC resistance specifications are compatible with this substitution.

Packaging and Footprint: The CW201212-R18J is specified as 0805 (2012 Metric) standard package, providing standardized footprint compatibility. The 0805-181K is classified as nonstandard packaging. The standardized package of the substitute part facilitates procurement, inventory management, and manufacturing consistency.

Frequently Asked Questions (FAQ)

Q: Can the CW201212-R18J directly replace the 0805-181K in existing designs?

A: Direct replacement is possible when circuit current requirements do not exceed 350 mA and the higher DC resistance of 850 mOhm is acceptable for the application. Both parts share the same 180 nH inductance, ceramic core material, unshielded configuration, and operating temperature range. Verify that your circuit design parameters fall within these specifications before implementation.

Q: What is the significance of the current rating difference between these parts?

A: The 0805-181K is rated for 400 mA, while the CW201212-R18J is rated for 350 mA. The current rating defines the maximum continuous current the inductor can handle without exceeding saturation or thermal limits. If your application requires currents between 350 mA and 400 mA, the substitute part is not suitable. For applications operating at 350 mA or below, the substitute part is appropriate.

Q: How does the DC resistance difference affect circuit performance?

A: The 0805-181K specifies a maximum DC resistance of 640 mOhm, while the CW201212-R18J has a DC resistance of 850 mOhm. Higher DC resistance increases power dissipation and voltage drop across the inductor. Evaluate whether the additional 210 mOhm resistance is acceptable for your circuit's power budget and signal integrity requirements.

Q: Are the frequency characteristics compatible?

A: Yes. Both parts exhibit identical Q factors of 50 @ 250 MHz and self-resonant frequencies within close proximity (870 MHz for the 0805-181K and 900 MHz for the CW201212-R18J). These frequency characteristics are compatible for high-frequency applications within the specified operating range.

Q: What is the packaging difference between these parts?

A: The 0805-181K uses nonstandard packaging, while the CW201212-R18J conforms to the 0805 (2012 Metric) standard package specification. Standard packaging simplifies procurement, reduces supply chain complexity, and ensures compatibility with automated assembly equipment designed for standard footprints.

Q: Does the inductance tolerance difference matter?

A: The 0805-181K has a tolerance of ±10%, while the CW201212-R18J has a tighter tolerance of ±5%. The substitute part's tighter tolerance provides greater inductance value consistency, which may improve circuit performance and reduce design margin requirements in precision applications.

Q: Is the CW201212-R18J suitable for RoHS-regulated applications?

A: Yes. The CW201212-R18J is ROHS3 compliant, making it suitable for applications subject to RoHS directives and customer requirements. The 0805-181K is non-compliant with RoHS standards.