CW201212-78NJ Equivalent & Substitute Parts

Part Overview

The CW201212-78NJ is a 78 nH unshielded drum core wirewound inductor manufactured by Bourns Inc. in 0805 (2012 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The part operates across -40°C to 125°C with ±5% inductance tolerance and ROHS3 compliance.

Substiute Parts

CW201212-78NJ

Bourns Inc.In Stock: 1064CW201212-78NJ Datasheet

Current PartRFQ

LQW18AN78NJ8ZD

Murata ElectronicsIn Stock: 6143LQW18AN78NJ8ZD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CW201212-78NJ is determined by the following critical parameters:

• Inductance value: 78 nH (exact match required)
• Inductance tolerance: ±5% (matching tolerance specification)
• Core type: Drum core, wirewound construction
• Shielding configuration: Unshielded
• Surface mount technology compatibility
• RoHS3 compliance and regulatory alignment

The LQW18AN78NJ8ZD from Murata Electronics satisfies these core substitution criteria. However, package geometry differs: the substitute uses 0603 (1608 Metric) versus the original 0805 (2012 Metric) footprint. This represents a physical size reduction with corresponding dimensional changes.

Parameter Comparison

Engineering Selection Recommendations

The LQW18AN78NJ8ZD qualifies as an electrical equivalent based on matching inductance value, tolerance, core construction, and shielding configuration. Both parts maintain ROHS3 compliance and operate within overlapping temperature ranges.

The substitute part carries AEC-Q200 automotive qualification, indicating enhanced reliability screening. The Murata component is currently in active production status, ensuring long-term availability compared to the obsolete Bourns part.

Package footprint transition from 0805 to 0603 requires PCB layout modification. The smaller 0603 package reduces board space by approximately 30% in length and 33% in width. Height reduction from 1.50mm to 1.00mm may provide clearance advantages in constrained assemblies.

Current rating specification (590 mA) and maximum DC resistance (410 mOhm) are provided for the substitute but not documented for the original part. These parameters should be verified against circuit requirements prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the LQW18AN78NJ8ZD directly replace the CW201212-78NJ without circuit modification?

A: Electrical substitution is valid. The 78 nH inductance and ±5% tolerance match exactly. PCB footprint redesign is required due to package size difference (0805 to 0603). Verify current handling capability (590 mA rating) against circuit demands.

Q: What are the primary differences between these inductors?

A: Core material differs (Ferrite vs. Non-Magnetic). The Murata part provides documented current rating, DC resistance, and Q factor specifications. The Bourns part does not specify these parameters. Physical dimensions are smaller for the Murata component.

Q: Is the 0603 package smaller than 0805?

A: Yes. The 0603 (1608 Metric) package measures 1.65mm x 0.99mm versus 2.10mm x 1.50mm for 0805 (2012 Metric). Height is reduced from 1.50mm to 1.00mm maximum.

Q: Are both parts RoHS compliant?

A: Both parts meet ROHS3 compliance requirements. The Murata part additionally carries AEC-Q200 automotive qualification.

Q: What is the operating temperature range for each part?

A: The Bourns CW201212-78NJ operates -40°C to 125°C. The Murata LQW18AN78NJ8ZD operates -55°C to 125°C, providing extended low-temperature performance.

Q: Does the substitute part have documented electrical characteristics?

A: Yes. The LQW18AN78NJ8ZD specifies 590 mA current rating, 410 mOhm maximum DC resistance, 28 Q factor at 150 MHz, and 2.28 GHz self-resonant frequency. The original part does not provide these specifications.