DEM8045Z-100M=P3 Equivalent & Substitute Parts

Part Overview

The DEM8045Z-100M=P3 is a 10 µH shielded wirewound inductor manufactured by Murata Electronics, designed for electromagnetic compatibility (EMC) applications. This surface mount component operates across -40°C to 125°C and carries AEC-Q200 automotive qualification. The part is currently in active production status with 985 units available in inventory. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained within specified tolerance ranges.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	10	µH	Critical - must match exactly
Inductance Tolerance	±20%	%	Critical - defines acceptable range
Current Rating	3.9	A	Critical - minimum acceptable performance
DC Resistance (DCR)	39.6	mOhm Max	Important - affects power dissipation
Saturation Current (Isat)	4.3	A	Important - defines linear operating region
Operating Temperature Range	-40 to 125	°C	Critical - application environment
Shielding Type	Shielded	—	Important - EMI containment
Mounting Type	Surface Mount	—	Critical - PCB assembly compatibility
Package / Case	3131 (8080 Metric)	—	Critical - footprint and height
AEC-Q200 Rating	Yes	—	Important - automotive qualification
RoHS3 Compliance	Compliant	—	Important - regulatory requirement

Substitute Part Grouping Explanation

Substitute parts for the DEM8045Z-100M=P3 are identified based on strict electrical and mechanical compatibility criteria. The following parameters must align within acceptable engineering tolerances:

Electrical Equivalence Requirements:

Inductance value of 10 µH at 100 kHz test frequency
Inductance tolerance of ±20% or tighter
Current rating of 3.9 A or greater
DC resistance not exceeding 39.6 mOhm (lower values acceptable)
Saturation current (Isat) of 4.3 A or greater
Operating temperature range encompassing -40°C to 125°C minimum

Mechanical Compatibility Requirements:

Surface mount technology
Package dimensions compatible with 3131 (8080 Metric) footprint
Height-seated maximum of 4.50 mm or less
Ferrite core material

Regulatory & Compliance Requirements:

AEC-Q200 automotive qualification
RoHS3 compliance
Moisture Sensitivity Level (MSL) of 1 or equivalent

The SRN8040HA-100M from Bourns Inc. meets these criteria with the following considerations: it maintains 10 µH inductance with ±20% tolerance, provides 3.1 A current rating (below the main part's 3.9 A but acceptable for many applications), and operates across -40°C to 150°C (exceeding the required range). The semi-shielded configuration differs from the main part's full shielding, which may affect EMI performance in sensitive applications.

Parameter Comparison

Parameter	DEM8045Z-100M=P3 (Murata)	SRN8040HA-100M (Bourns)	Compatibility Notes
Inductance	10 µH	10 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	3.9 A	3.1 A	Substitute rated lower; verify application current requirements
Saturation Current (Isat)	4.3 A	4.8 A	Substitute exceeds main part
DC Resistance (DCR)	39.6 mOhm Max	61 mOhm Max	Substitute has higher resistance; affects power dissipation
Shielding	Shielded	Semi-Shielded	Different EMI containment characteristics
Operating Temperature	-40°C to 125°C	-40°C to 150°C	Substitute has extended upper range
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	3131 (8080 Metric)	Nonstandard	Different package designation; verify footprint compatibility
Size / Dimension	8.00 x 8.00 mm	8.15 x 7.90 mm	Dimensions similar; verify PCB layout clearances
Height - Seated (Max)	4.50 mm	4.20 mm	Substitute is lower profile
AEC-Q200 Rating	Yes	Yes	Equivalent automotive qualification
RoHS3 Compliance	Compliant	Compliant	Equivalent
Q @ Frequency	Not specified	11 @ 1 MHz	Substitute data provided
Frequency - Self Resonant	Not specified	20 MHz	Substitute data provided

Engineering Selection Recommendations

Primary Part Selection (DEM8045Z-100M=P3): Select the Murata DEM8045Z-100M=P3 when full shielding is required for EMI-sensitive applications, when the 3.9 A current rating is necessary for circuit operation, or when the lower DC resistance of 39.6 mOhm is critical for minimizing power dissipation. This part maintains active production status with established supply availability.

Substitute Part Selection (SRN8040HA-100M): The Bourns SRN8040HA-100M is suitable as a substitute when:

Application current requirements do not exceed 3.1 A
Semi-shielded configuration provides adequate EMI containment for the circuit design
Higher DC resistance (61 mOhm) is acceptable within power budget calculations
Extended operating temperature range to 150°C provides additional thermal margin
Nonstandard package dimensions (8.15 x 7.90 mm) fit within PCB layout constraints

Both parts carry AEC-Q200 automotive qualification and RoHS3 compliance, supporting equivalent regulatory requirements. The substitute part offers higher saturation current (4.8 A versus 4.3 A), providing additional headroom in transient conditions.

Frequently Asked Questions (FAQ)

Q: Can the SRN8040HA-100M directly replace the DEM8045Z-100M=P3 in all applications?

A: Direct replacement is possible only when application current requirements do not exceed 3.1 A and semi-shielded EMI containment is acceptable. The higher DC resistance (61 mOhm versus 39.6 mOhm) increases power dissipation by approximately 54%, which must be evaluated in thermal analysis. Verify PCB layout compatibility with the nonstandard package dimensions.

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

A: The main part features full shielding, providing complete magnetic field containment. The substitute part uses semi-shielded construction, which reduces but does not eliminate external magnetic field radiation. In EMI-critical circuits, full shielding may be required; in less sensitive applications, semi-shielded performance is sufficient. Conduct EMI testing if shielding performance is uncertain.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the DEM8045Z-100M=P3 and SRN8040HA-100M carry AEC-Q200 automotive qualification, confirming suitability for automotive-grade reliability and temperature cycling requirements.

Q: How do the current ratings affect substitution decisions?

A: The main part is rated for 3.9 A continuous current, while the substitute is rated for 3.1 A. If circuit design requires sustained current above 3.1 A, the substitute part cannot be used. Saturation current (Isat) differs as well: the main part saturates at 4.3 A, while the substitute saturates at 4.8 A. Verify that actual circuit current remains below the substitute's 3.1 A rating to prevent inductor saturation and performance degradation.

Q: What packaging considerations apply to these parts?

A: The main part uses the standard 3131 (8080 Metric) package with 8.00 x 8.00 mm footprint and 4.50 mm maximum height. The substitute uses a nonstandard package with 8.15 x 7.90 mm footprint and 4.20 mm maximum height. While dimensions are similar, verify that PCB layout, solder mask clearances, and adjacent component placement accommodate the substitute's slightly different footprint before assembly.

Q: What is the impact of higher DC resistance in the substitute part?

A: The substitute's 61 mOhm DC resistance versus the main part's 39.6 mOhm results in approximately 54% higher resistive losses. In a 3.1 A circuit, this translates to additional power dissipation of approximately 0.59 mW compared to 0.38 mW in the main part. Evaluate thermal performance in the application's thermal environment to confirm acceptable operating temperature.

Q: Are there inventory or lead time considerations?

A: The main part (DEM8045Z-100M=P3) has 985 units in stock. The substitute (SRN8040HA-100M) has 1820 units available, providing greater inventory availability if supply constraints exist for the primary part.

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