SPM4012T-4R7M-LR Equivalent & Substitute Parts

Part Overview

The SPM4012T-4R7M-LR is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1.7 A continuous current with a maximum DC resistance of 196.7 mOhm. This surface mount component is designed for applications requiring compact, shielded inductance in the microhenry range with controlled saturation characteristics. The part maintains Active product status and is RoHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	4.7	µH	Critical - must match
Inductance Tolerance	±20%	%	Critical - defines acceptable range
Current Rating	1.7	A	Critical - minimum thermal requirement
DC Resistance (DCR)	196.7	mOhm Max	Critical - affects power dissipation
Current - Saturation (Isat)	3.3	A	Important - defines linear operating range
Shielding	Shielded	—	Critical - EMI containment requirement
Type	Drum Core, Wirewound	—	Critical - construction method
Mounting Type	Surface Mount	—	Critical - assembly compatibility
Operating Temperature Range	-40°C ~ 125°C	°C	Important - thermal envelope
Package / Case	Nonstandard	—	Critical - footprint compatibility
Size / Dimension	0.173" L x 0.161" W (4.40mm x 4.10mm)	—	Critical - PCB layout constraint
Height - Seated (Max)	0.047" (1.20mm)	—	Critical - clearance requirement
RoHS Status	RoHS3 Compliant	—	Important - regulatory compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—	Important - handling requirement

Substitute Part Grouping Explanation

Substitution of the SPM4012T-4R7M-LR is evaluated based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Inductance value must be 4.7 µH within the ±20% tolerance band
Current rating must meet or exceed 1.7 A continuous operation
DC resistance must not exceed 196.7 mOhm to maintain equivalent power dissipation characteristics
Saturation current (Isat) must support the intended application current envelope
Shielding must be present to maintain EMI containment

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package construction must be Drum Core, Wirewound
Physical dimensions must accommodate the 4.40mm x 4.10mm footprint and 1.20mm maximum height
Core material composition must be compatible with the specified operating temperature range

Regulatory & Environmental Criteria:

RoHS compliance status must be maintained
Moisture Sensitivity Level must be acceptable for assembly processes
Operating temperature range must support the application environment

The MPI4012V2-4R7-R from Eaton - Electronics Division meets these substitution criteria.

Parameter Comparison

Parameter	SPM4012T-4R7M-LR (TDK)	MPI4012V2-4R7-R (Eaton)	Compatibility Assessment
Inductance	4.7 µH	4.7 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating (Amps)	1.7 A	1.8 A	Substitute exceeds requirement
DC Resistance (DCR)	196.7 mOhm Max	210 mOhm Max	Substitute within acceptable margin
Current - Saturation (Isat)	3.3 A	2.8 A	Substitute lower; verify application current envelope
Shielding	Shielded	Shielded	Equivalent
Type	Drum Core, Wirewound	Drum Core, Wirewound	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature Range	-40°C ~ 125°C	-55°C ~ 125°C	Substitute provides extended low-temperature range
Size / Dimension	0.173" L x 0.161" W (4.40mm x 4.10mm)	0.160" L x 0.171" W (4.06mm x 4.35mm)	Dimensions within typical PCB layout tolerance
Height - Seated (Max)	0.047" (1.20mm)	0.047" (1.20mm)	Equivalent
RoHS Status	RoHS3 Compliant	RoHS Compliant	Both compliant; TDK is RoHS3 certified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The MPI4012V2-4R7-R is qualified as a substitute for the SPM4012T-4R7M-LR based on the following engineering criteria:

Electrical Performance: Both components maintain 4.7 µH inductance at ±20% tolerance with equivalent shielding characteristics. The Eaton substitute provides 1.8 A current rating, exceeding the 1.7 A requirement. DC resistance of 210 mOhm is marginally higher than the 196.7 mOhm specification but remains within acceptable engineering margins for most applications. The saturation current of 2.8 A in the substitute is lower than the original 3.3 A; applications operating near saturation limits must be evaluated against actual circuit current demands.

Mechanical Compatibility: Both components are surface mount drum core wirewound inductors with identical maximum height (1.20mm). Footprint dimensions are within typical PCB layout tolerances, with the Eaton part measuring 4.06mm x 4.35mm versus the TDK 4.40mm x 4.10mm. Both are suitable for standard pick-and-place assembly processes.

Regulatory & Environmental: Both components meet RoHS compliance requirements. The Eaton substitute provides an extended operating temperature range (-55°C to 125°C) compared to the TDK original (-40°C to 125°C), offering improved performance in cold environment applications. Both maintain MSL Level 1 (Unlimited) moisture sensitivity rating.

Product Status: Both components maintain Active product status with confirmed inventory availability, ensuring long-term supply chain viability.

Frequently Asked Questions (FAQ)

Q: Can the MPI4012V2-4R7-R be used as a direct replacement for the SPM4012T-4R7M-LR?

A: Yes, the MPI4012V2-4R7-R qualifies as a substitute based on equivalent inductance, tolerance, shielding, and mounting characteristics. Physical dimensions and height are compatible with standard PCB layouts. However, the lower saturation current (2.8 A vs. 3.3 A) requires verification that circuit peak currents do not exceed the substitute's linear operating range.

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

A: The Eaton substitute has a maximum DC resistance of 210 mOhm compared to 196.7 mOhm in the TDK original. This 13 mOhm difference results in approximately 6.6% higher resistive losses at rated current. For applications sensitive to power dissipation or thermal performance, this margin should be evaluated against thermal budget constraints.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The Eaton substitute measures 4.06mm x 4.35mm versus the TDK original at 4.40mm x 4.10mm. Both components share the same maximum height of 1.20mm. These dimensional variations are within typical PCB layout tolerances for surface mount components. However, designs with tight spatial constraints should verify footprint compatibility with actual board artwork.

Q: Does the extended temperature range of the substitute provide any advantage?

A: The MPI4012V2-4R7-R operates from -55°C to 125°C, compared to the SPM4012T-4R7M-LR range of -40°C to 125°C. This extended low-temperature specification provides operational margin for applications in cold environments or equipment with wide ambient temperature requirements.

Q: What compliance certifications apply to both components?

A: Both components are RoHS compliant. The TDK original is RoHS3 certified, while the Eaton substitute is RoHS compliant. Both maintain MSL Level 1 (Unlimited) moisture sensitivity rating, requiring no special handling or baking procedures prior to assembly.

Q: How should saturation current differences be evaluated in circuit design?

A: The substitute part has a saturation current of 2.8 A versus 3.3 A in the original. Saturation current defines the threshold at which inductance begins to degrade. Applications must ensure that peak circuit currents remain below the substitute's saturation limit to maintain specified inductance performance. If circuit design requires operation near or above 2.8 A, the original SPM4012T-4R7M-LR should be retained.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message