VLP8040T-4R7M Equivalent & Substitute Parts

Part Overview

The VLP8040T-4R7M is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 4.4 A continuous current with a maximum DC resistance of 25 mOhm. This surface mount component operates across the temperature range of -40°C to 105°C and is designed for applications requiring controlled inductance with low resistance characteristics.

The VLP8040T-4R7M is classified as obsolete. Identifying equivalent and 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	Value
Inductance	4.7 µH
Inductance Tolerance	±20%
Current Rating (Continuous)	4.4 A
Current - Saturation (Isat)	4.4 A
DC Resistance (DCR)	25 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C to 105°C
Mounting Type	Surface Mount
Package Type	Nonstandard
Size (L x W)	8.70 mm x 8.60 mm
Height (Seated Max)	4.00 mm
Inductance Test Frequency	100 kHz

Substitute Part Grouping Explanation

Substitute parts for the VLP8040T-4R7M are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

Inductance value: 4.7 µH (exact match required)
Inductance tolerance: ±20% or tighter
Core material: Ferrite
Mounting type: Surface Mount
Inductance test frequency: 100 kHz

Secondary Compatibility Parameters:

Current rating: Minimum 4.1 A (acceptable for applications designed for 4.4 A)
DC resistance: Maximum 35 mOhm (acceptable variance from 25 mOhm specification)
Operating temperature range: Minimum -40°C to 105°C coverage
Shielding type: Shielded or semi-shielded (both acceptable for EMI control)
Physical dimensions: Footprint compatibility within nonstandard package category

The two substitute parts identified—VLS6045EX-4R7M and SRN8040-4R7Y—meet these criteria while offering active product status and improved supply availability.

Parameter Comparison

Parameter	VLP8040T-4R7M (Main)	VLS6045EX-4R7M (Substitute)	SRN8040-4R7Y (Substitute)
Manufacturer	TDK Corporation	TDK Corporation	Bourns Inc.
Inductance	4.7 µH	4.7 µH	4.7 µH
Inductance Tolerance	±20%	±20%	±30%
Current Rating (Amps)	4.4 A	4.2 A	4.1 A
Current - Saturation (Isat)	4.4 A	5.8 A	4.7 A
DC Resistance (DCR)	25 mOhm Max	27 mOhm	24 mOhm Max
Core Material	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Semi-Shielded
Operating Temperature Range	-40°C to 105°C	-40°C to 105°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size (L x W)	8.70 mm x 8.60 mm	6.00 mm x 6.00 mm	8.00 mm x 8.00 mm
Height (Seated Max)	4.00 mm	4.50 mm	4.00 mm
Inductance Test Frequency	100 kHz	100 kHz	100 kHz
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VLS6045EX-4R7M (TDK Corporation): This substitute is an active product with ROHS3 compliance and identical inductance and tolerance specifications. The current rating of 4.2 A is 95% of the original specification, and DC resistance of 27 mOhm is within acceptable variance. The smaller footprint (6.00 mm x 6.00 mm) requires PCB layout verification. This option maintains full TDK product line continuity and offers superior supply availability.

SRN8040-4R7Y (Bourns Inc.): This substitute is an active product with ROHS3 compliance and extended operating temperature range (-40°C to 125°C). The current rating of 4.1 A is 93% of the original specification, and DC resistance of 24 mOhm matches the original specification closely. The semi-shielded design differs from the fully shielded original; EMI performance verification is required for sensitive applications. Physical dimensions (8.00 mm x 8.00 mm) are comparable to the original footprint.

Frequently Asked Questions (FAQ)

Q: Can VLS6045EX-4R7M be used as a direct replacement for VLP8040T-4R7M?

A: VLS6045EX-4R7M meets the electrical specifications for inductance, tolerance, and core material. However, the reduced footprint (6.00 mm x 6.00 mm versus 8.70 mm x 8.60 mm) requires PCB layout modification. The current rating of 4.2 A is acceptable for applications designed for 4.4 A continuous current with appropriate thermal management verification.

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

A: Shielded inductors (VLP8040T-4R7M and VLS6045EX-4R7M) provide complete magnetic field containment, reducing EMI coupling to adjacent components. Semi-shielded inductors (SRN8040-4R7Y) provide partial field containment with lower profile and cost. Selection depends on circuit layout density and EMI requirements.

Q: Are both substitute parts compatible with the original operating temperature range?

A: VLS6045EX-4R7M covers the identical range (-40°C to 105°C). SRN8040-4R7Y extends the range to -40°C to 125°C, providing additional thermal margin for high-temperature applications.

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

A: The original VLP8040T-4R7M specifies 25 mOhm maximum. VLS6045EX-4R7M is rated at 27 mOhm (8% increase), and SRN8040-4R7Y is rated at 24 mOhm maximum (4% decrease). These variations affect power dissipation and voltage drop across the inductor. Calculate actual losses based on circuit current profiles to determine acceptability.

Q: Do both substitute parts have the same saturation current characteristics?

A: No. VLP8040T-4R7M has Isat of 4.4 A. VLS6045EX-4R7M has Isat of 5.8 A (higher margin). SRN8040-4R7Y has Isat of 4.7 A (slightly higher margin). Higher saturation current provides additional design margin for transient current conditions.

Q: Are there compliance or certification differences between the options?

A: VLP8040T-4R7M compliance status is not specified. Both VLS6045EX-4R7M and SRN8040-4R7Y are ROHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes.

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