DEM8045Z-4R7N=P3 Equivalent & Substitute Parts

Part Overview

The DEM8045Z-4R7N=P3 is a 4.7 µH shielded wirewound inductor manufactured by Murata Electronics, designed for electromagnetic compatibility (EMC) applications. This surface mount component features a ferrite core with a current rating of 6.3 A and maximum DC resistance of 18 mOhm. The part is actively produced and widely available in inventory. Substitute parts are identified when original stock becomes unavailable or when design requirements permit alternative electrical and mechanical parameters within specified tolerances.

Substiute Parts

DEM8045Z-4R7N=P3

Murata ElectronicsIn Stock: 982DEM8045Z-4R7N=P3 Datasheet

Current PartRFQ

SRN8040HA-4R7M

Bourns Inc.In Stock: 1944SRN8040HA-4R7M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DEM8045Z-4R7N=P3 are identified based on the following critical parameters:

Primary Substitution Criteria:

• Inductance value: 4.7 µH (tolerance range ±20% to ±30% acceptable)
• Current rating: minimum 4.1 A (substitute must support primary application current requirements)
• DC resistance: maximum 30 mOhm (electrical performance within acceptable limits)
• Core material: Ferrite (electromagnetic characteristics)
• Mounting type: Surface Mount (physical installation compatibility)
• Operating temperature range: minimum -40°C to 125°C coverage
• Compliance: AEC-Q200 rated, ROHS3 compliant

The substitute part SRN8040HA-4R7M from Bourns Inc. meets these criteria with equivalent inductance, ferrite core construction, and surface mount configuration. Variations in shielding type (semi-shielded vs. fully shielded), package dimensions, and current ratings are documented for engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (DEM8045Z-4R7N=P3): Select the Murata DEM8045Z-4R7N=P3 when the application requires the full 6.3 A current rating, lower DC resistance (18 mOhm maximum), and fully shielded electromagnetic performance. This part is actively produced with established supply chain availability and meets AEC-Q200 automotive qualification standards.

Substitute Part Selection (SRN8040HA-4R7M): The Bourns SRN8040HA-4R7M is suitable as a substitute when:

• Application current requirements do not exceed 4.1 A
• Semi-shielded configuration meets EMI performance specifications
• Extended operating temperature range to 150°C is beneficial
• Tighter inductance tolerance (±20%) is advantageous
• PCB layout accommodates nonstandard package dimensions and 0.30mm height difference

Both parts carry AEC-Q200 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are maintained in either selection.

Frequently Asked Questions (FAQ)

Q: Can the SRN8040HA-4R7M directly replace the DEM8045Z-4R7N=P3 in all applications?

A: No. The Bourns substitute has a lower current rating (4.1 A vs. 6.3 A) and higher DC resistance (30 mOhm vs. 18 mOhm). Substitution is valid only when the application current requirement does not exceed 4.1 A and power dissipation limits are acceptable with the higher resistance value.

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

A: Shielded inductors (DEM8045Z-4R7N=P3) provide complete electromagnetic containment, reducing radiated EMI. Semi-shielded inductors (SRN8040HA-4R7M) offer partial shielding with lower cost and slightly reduced height. Selection depends on EMI requirements of the specific circuit.

Q: Are the physical dimensions compatible for PCB layout?

A: Dimensions are similar but not identical. The Murata part measures 8.00mm x 8.00mm with 4.50mm height; the Bourns part measures 8.15mm x 7.90mm with 4.20mm height. PCB footprint verification is required before substitution to ensure solder pad alignment and clearance.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both the DEM8045Z-4R7N=P3 and SRN8040HA-4R7M carry AEC-Q200 ratings and ROHS3 compliance, meeting automotive industry reliability and environmental standards.

Q: What is the inductance tolerance difference between these parts?

A: The Murata part has ±30% tolerance, while the Bourns part has ±20% tolerance. The Bourns part offers tighter inductance accuracy, which may be beneficial in precision filter or resonant circuit applications.

Q: How do the saturation current ratings compare?

A: Both parts have comparable saturation currents (Murata 6.7 A, Bourns 7.0 A). However, the Murata part's continuous current rating of 6.3 A is higher than the Bourns rating of 4.1 A, making the Murata part suitable for higher sustained current applications.