VLP8040T-151M Equivalent & Substitute Parts

Part Overview

The VLP8040T-151M is a 150 µH shielded drum core, wirewound inductor manufactured by TDK Corporation, rated for 800 mA continuous current with a maximum DC resistance of 490 mOhm. This surface mount component operates across the temperature range of -40°C to 105°C and is designed for applications requiring stable inductance at 100 kHz test frequency.

The VLP8040T-151M is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	VLP8040T-151M
Inductance	150 µH
Inductance Tolerance	±20%
Current Rating	800 mA
DC Resistance (DCR)	490 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C to 105°C
Mounting Type	Surface Mount
Inductance Test Frequency	100 kHz

Substitute Part Grouping Explanation

Substitution of the VLP8040T-151M is determined by the following critical parameters:

Inductance Value: Must be 150 µH with ±20% tolerance to maintain circuit performance
Core Type and Shielding: Ferrite core with shielding required for electromagnetic compatibility
Current Rating: Minimum 800 mA continuous current capability
DC Resistance: Maximum allowable DCR to minimize power loss and heat generation
Operating Temperature Range: Must support -40°C to 105°C operation
Mounting Configuration: Surface mount package for PCB integration
Test Frequency: Inductance measured at 100 kHz

The VLS6045EX-151M meets these substitution criteria while offering improved supply availability and active product status.

Parameter Comparison

Parameter	VLP8040T-151M	VLS6045EX-151M	Compatibility
Inductance	150 µH	150 µH	Match
Inductance Tolerance	±20%	±20%	Match
Current Rating	800 mA	700 mA	Substitute rated lower
Current - Saturation (Isat)	800 mA	900 mA	Substitute rated higher
DC Resistance (DCR)	490 mOhm Max	760 mOhm	Substitute higher resistance
Core Material	Ferrite	Ferrite	Match
Shielding	Shielded	Shielded	Match
Operating Temperature Range	-40°C to 105°C	-40°C to 105°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Inductance Test Frequency	100 kHz	100 kHz	Match
Size / Dimension	0.315" L x 0.303" W (8.00mm x 7.70mm)	0.236" L x 0.236" W (6.00mm x 6.00mm)	Substitute smaller footprint
Height - Seated (Max)	0.157" (4.00mm)	0.177" (4.50mm)	Substitute slightly taller
Product Status	Obsolete	Active	Substitute actively manufactured
RoHS Status	Not specified	ROHS3 Compliant	Substitute compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Match

Engineering Selection Recommendations

The VLS6045EX-151M is the manufacturer-recommended substitute for the obsolete VLP8040T-151M. Selection of this substitute is supported by the following factors:

Product Status: The VLS6045EX-151M maintains active manufacturing status with 26,108 units in stock, ensuring long-term supply availability compared to the obsolete VLP8040T-151M.

Electrical Equivalence: Both inductors provide 150 µH inductance at ±20% tolerance with identical operating temperature ranges and test frequencies. The substitute's saturation current of 900 mA exceeds the original 800 mA rating, providing additional margin.

Compliance: The VLS6045EX-151M is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Physical Considerations: The VLS6045EX-151M features a smaller footprint (6.00mm x 6.00mm versus 8.00mm x 7.70mm) with a marginal height increase (4.50mm versus 4.00mm). PCB layout verification is required to confirm fit within existing design constraints.

DC Resistance Trade-off: The substitute exhibits higher DC resistance (760 mOhm versus 490 mOhm maximum). Applications sensitive to resistive losses or thermal dissipation must evaluate this parameter against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the VLS6045EX-151M directly replace the VLP8040T-151M in existing designs?

A: Electrical substitution is valid based on matching inductance, tolerance, temperature range, and test frequency. Physical PCB layout verification is required due to different package dimensions. The higher DC resistance of the substitute must be evaluated for applications with strict power loss budgets.

Q: What is the significance of the lower current rating (700 mA) in the VLS6045EX-151M compared to the original 800 mA?

A: The substitute's continuous current rating is 700 mA; however, its saturation current (Isat) is rated at 900 mA, exceeding the original component. For applications operating at or near 800 mA continuous current, thermal analysis and margin assessment are necessary to confirm suitability.

Q: Are there compliance differences between these components?

A: The VLS6045EX-151M is ROHS3 compliant, while the VLP8040T-151M compliance status is not specified. Both components are REACH Unaffected and carry identical moisture sensitivity levels (MSL 1, Unlimited).

Q: How does the package size difference affect PCB design?

A: The VLS6045EX-151M occupies a smaller footprint (6.00mm x 6.00mm) compared to the VLP8040T-151M (8.00mm x 7.70mm), allowing for more compact layouts. The height difference (4.50mm versus 4.00mm) is minimal and typically accommodated within standard PCB clearance specifications.

Q: What is the impact of increased DC resistance on circuit performance?

A: The VLS6045EX-151M exhibits 760 mOhm DC resistance versus the original 490 mOhm maximum. This 55% increase results in higher resistive losses and heat generation. Circuits with low-impedance requirements or thermal constraints require detailed analysis to confirm acceptable performance.

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