VLP8040T-680M Equivalent & Substitute Parts

Part Overview

The VLP8040T-680M is a 68 µH shielded drum core, wirewound inductor manufactured by TDK Corporation, rated for 1.2 A with a maximum DC resistance of 230 mOhm. This surface mount component operates across the temperature range of -40°C to 105°C and is designed for applications requiring fixed inductance in compact form factors. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	68 µH
Tolerance	±20%
Current Rating	1.2 A
DC Resistance (DCR)	230 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Operating Temperature	-40°C to 105°C
Mounting Type	Surface Mount
Inductance Test Frequency	100 kHz

Substitute Part Grouping Explanation

Substitution of the VLP8040T-680M is determined by strict equivalence across the following parameters: inductance value (68 µH), tolerance (±20%), core material (ferrite), shielding classification, mounting type (surface mount), and operating temperature range compatibility. The current rating and DC resistance must meet or exceed the original specification to ensure functional compatibility in the target application. All substitute parts maintain the same inductance test frequency of 100 kHz, ensuring measurement consistency.

Parameter Comparison

Parameter	VLP8040T-680M (Main)	VLS6045EX-680M	SRN8040-680M	CDRH80D38DNP-680MC
Manufacturer	TDK Corporation	TDK Corporation	Bourns Inc.	Sumida America Components Inc.
Inductance	68 µH	68 µH	68 µH	68 µH
Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	1.2 A	1 A	1.1 A	1.22 A
Current - Saturation (Isat)	1.2 A	1.4 A	1.2 A	1.35 A
DC Resistance (DCR)	230 mOhm Max	310 mOhm	275 mOhm Max	245 mOhm
Shielding	Shielded	Shielded	Semi-Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Operating Temperature	-40°C to 105°C	-40°C to 105°C	-40°C to 125°C	-40°C to 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Inductance Test Frequency	100 kHz	100 kHz	100 kHz	100 kHz
Product Status	Obsolete	Active	Active	Active
Size / Dimension (L x W)	0.343" x 0.339" (8.70mm x 8.60mm)	0.236" x 0.236" (6.00mm x 6.00mm)	0.315" x 0.315" (8.00mm x 8.00mm)	0.327" x 0.327" (8.30mm x 8.30mm)
Height - Seated (Max)	0.157" (4.00mm)	0.177" (4.50mm)	0.157" (4.00mm)	0.165" (4.20mm)

Engineering Selection Recommendations

VLS6045EX-680M (TDK Corporation) is the manufacturer-recommended substitute. This part maintains TDK manufacturing continuity and is ROHS3 compliant with active product status. However, the current rating of 1 A is below the original 1.2 A specification, and DC resistance is elevated at 310 mOhm. This substitute is suitable only for applications where the 1 A current limit is acceptable. The significantly smaller footprint (6.00mm x 6.00mm) may require PCB layout modifications.

SRN8040-680M (Bourns Inc.) provides the closest electrical performance match with 1.1 A current rating and 275 mOhm DCR, both within acceptable margins of the original specification. This part features an extended operating temperature range to 125°C and is ROHS3 compliant with active status. The semi-shielded design differs from the original shielded configuration and may affect EMI performance in sensitive applications. Physical dimensions (8.00mm x 8.00mm) are compatible with the original footprint.

CDRH80D38DNP-680MC (Sumida America Components Inc.) offers the highest current rating at 1.22 A and the lowest DC resistance at 245 mOhm, providing superior electrical performance relative to the original specification. This part maintains full shielding and is ROHS3 compliant with active status. Physical dimensions (8.30mm x 8.30mm) are closely matched to the original part. This substitute is the optimal choice for applications requiring maximum performance headroom.

Frequently Asked Questions (FAQ)

Q: Can VLS6045EX-680M replace VLP8040T-680M in all applications?

A: No. While VLS6045EX-680M maintains the same inductance and tolerance, its 1 A current rating is below the original 1.2 A specification. Substitution is valid only for applications where the reduced current capacity is acceptable. The elevated DC resistance (310 mOhm vs. 230 mOhm) will increase power dissipation. The significantly smaller package footprint requires PCB layout verification.

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

A: Shielded inductors use a complete ferrite shield to contain magnetic fields, reducing EMI coupling to adjacent components. Semi-shielded inductors provide partial shielding, allowing some magnetic field leakage. SRN8040-680M is semi-shielded, which may introduce measurable differences in EMI performance compared to the fully shielded original design.

Q: Which substitute offers the best electrical performance?

A: CDRH80D38DNP-680MC provides the highest current rating (1.22 A) and lowest DC resistance (245 mOhm), delivering superior performance margins relative to the original VLP8040T-680M specification. This part is recommended for applications requiring maximum electrical headroom.

Q: Are all substitutes RoHS compliant?

A: VLS6045EX-680M and SRN8040-680M are ROHS3 compliant. CDRH80D38DNP-680MC RoHS status is not specified in the provided data. Verify RoHS compliance requirements with your procurement specifications before final selection.

Q: Do the substitute parts fit the same PCB footprint?

A: No. VLS6045EX-680M has a significantly smaller footprint (6.00mm x 6.00mm) requiring PCB layout modification. SRN8040-680M (8.00mm x 8.00mm) and CDRH80D38DNP-680MC (8.30mm x 8.30mm) are closely matched to the original 8.70mm x 8.60mm dimensions and may be compatible with minimal layout adjustment. Verify mechanical clearances and pad spacing before implementation.

Q: What is the operating temperature range compatibility?

A: VLP8040T-680M, VLS6045EX-680M, and CDRH80D38DNP-680MC operate from -40°C to 105°C. SRN8040-680M extends to -40°C to 125°C, providing additional thermal margin for high-temperature applications.

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