DEM8045Z-330M=P3 Equivalent & Substitute Parts

Part Overview

The DEM8045Z-330M=P3 is a 33 µH shielded drum core wirewound inductor manufactured by Murata Electronics. This surface mount component is rated for 2.2 A continuous current with a maximum DC resistance of 132 mOhm and operates across the temperature range of -40°C to 125°C. The part carries AEC-Q200 automotive qualification and is RoHS3 compliant. As an active product with 846 units in stock, substitute parts may be required for design flexibility, supply chain optimization, or application-specific performance requirements.

Substiute Parts

DEM8045Z-330M=P3

Murata ElectronicsIn Stock: 893DEM8045Z-330M=P3 Datasheet

Current PartRFQ

SRN8040HA-330M

Bourns Inc.In Stock: 2122SRN8040HA-330M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DEM8045Z-330M=P3 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Inductance value: 33 µH
• Inductance tolerance: ±20%
• Core material: Ferrite
• Mounting type: Surface Mount
• Regulatory compliance: AEC-Q200, RoHS3

Secondary Compatibility Factors:

• Current rating capability (minimum 2.2 A required for direct substitution)
• DC resistance (lower values preferred for reduced losses)
• Operating temperature range (minimum -40°C to 125°C)
• Physical dimensions (nonstandard package compatibility)
• Shielding characteristics (shielded or semi-shielded acceptable based on EMI requirements)

The SRN8040HA-330M from Bourns Inc. meets the primary equivalence criteria with matching inductance, tolerance, core material, and compliance ratings. However, the substitute part exhibits a reduced current rating of 1.7 A compared to the main part's 2.2 A specification, which represents a functional limitation in high-current applications.

Parameter Comparison

Engineering Selection Recommendations

DEM8045Z-330M=P3 (Primary Selection): The Murata part is the specified component and should be used as the first choice. It provides the highest current rating at 2.2 A with the lowest DC resistance at 132 mOhm maximum. Full shielding provides superior electromagnetic interference rejection. AEC-Q200 qualification and RoHS3 compliance confirm automotive-grade reliability. Operating temperature range extends to 125°C.

SRN8040HA-330M (Substitute Selection): The Bourns equivalent is suitable for applications where the 1.7 A current rating is sufficient and the 166 mOhm maximum DC resistance is acceptable. The semi-shielded configuration may introduce additional EMI considerations in sensitive circuits. The extended operating temperature range to 150°C provides thermal margin in high-temperature environments. Both parts maintain AEC-Q200 and RoHS3 compliance. Physical dimensions are comparable with minimal PCB layout impact.

Selection Constraints: Applications requiring continuous current operation above 1.7 A must use the DEM8045Z-330M=P3. Circuits with strict EMI requirements should prioritize the fully shielded DEM8045Z-330M=P3 over the semi-shielded substitute. Both parts are qualified for automotive use and meet all regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SRN8040HA-330M directly replace the DEM8045Z-330M=P3 in all applications?

A: Direct replacement is limited by current rating. The SRN8040HA-330M is rated for 1.7 A continuous current versus the DEM8045Z-330M=P3 at 2.2 A. Applications operating at or above 1.7 A require the Murata part. The semi-shielded design of the Bourns part may also affect EMI performance in sensitive circuits.

Q: What are the physical compatibility considerations?

A: Both parts use nonstandard surface mount packages with comparable dimensions. The DEM8045Z-330M=P3 measures 8.00 x 8.00 x 4.50 mm while the SRN8040HA-330M measures 8.15 x 7.90 x 4.20 mm. These minor dimensional differences typically allow PCB footprint compatibility, though layout verification is necessary.

Q: Are both parts automotive qualified?

A: Yes. Both the DEM8045Z-330M=P3 and SRN8040HA-330M carry AEC-Q200 qualification, confirming suitability for automotive applications. Both are RoHS3 compliant and REACH unaffected.

Q: How do the DC resistance values affect circuit performance?

A: The DEM8045Z-330M=P3 specifies 132 mOhm maximum DC resistance compared to 166 mOhm for the SRN8040HA-330M. In power delivery applications, the lower resistance of the Murata part reduces I²R losses and heat generation. The 34 mOhm difference becomes significant in high-current or continuous-duty circuits.

Q: What is the difference between shielded and semi-shielded configurations?

A: The DEM8045Z-330M=P3 provides full shielding for maximum EMI containment. The SRN8040HA-330M uses semi-shielded construction, which reduces but does not eliminate radiated emissions. Circuits with sensitive analog or RF components should use the fully shielded part.

Q: Do both parts have the same operating temperature range?

A: No. The DEM8045Z-330M=P3 operates from -40°C to 125°C. The SRN8040HA-330M extends to -40°C to 150°C. For applications requiring operation above 125°C, the Bourns part provides additional thermal margin.

Q: What is the saturation current specification and why does it matter?

A: Saturation current indicates the point at which the inductor's core begins to saturate, causing inductance to degrade. The DEM8045Z-330M=P3 saturates at 2.3 A while the SRN8040HA-330M saturates at 2.6 A. For transient current spikes, the Bourns part provides greater headroom before saturation occurs.