ASPI-0412S-6R8N-T3 Equivalent & Substitute Parts

Part Overview

The ASPI-0412S-6R8N-T3 is a 6.8 µH shielded drum core wirewound inductor manufactured by Abracon LLC, rated for 780 mA continuous current with a maximum DC resistance of 307mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	6.8 µH
Tolerance	±30%
Current Rating	780 mA
Current - Saturation (Isat)	980 mA
DC Resistance (DCR)	307 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Package Size	4.00mm x 4.00mm
Operating Temperature Range	-25°C ~ 100°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ASPI-0412S-6R8N-T3 is determined by the following critical parameters:

Inductance value: 6.8 µH (exact match required)
Inductance tolerance: ±30% (must match or be tighter)
Core type: Ferrite drum core, wirewound, shielded
Mounting: Surface mount, nonstandard package
Physical footprint: 4.00mm x 4.00mm base dimensions
Current rating: Minimum 780 mA continuous
Saturation current: Minimum 980 mA
DC resistance: Lower values acceptable; 307 mOhm is maximum for original
Operating temperature: Must support -25°C ~ 100°C minimum
Compliance: ROHS3 compliant, REACH unaffected

The VLCF4018T-6R8NR94-2 from TDK Corporation meets all substitution criteria with improved electrical performance characteristics.

Parameter Comparison

Parameter	ASPI-0412S-6R8N-T3 (Abracon)	VLCF4018T-6R8NR94-2 (TDK)	Compatibility
Inductance	6.8 µH	6.8 µH	Exact Match
Tolerance	±30%	±30%	Exact Match
Current Rating (Amps)	780 mA	940 mA	Substitute Exceeds
Current - Saturation (Isat)	980 mA	940 mA	Substitute Meets Minimum
DC Resistance (DCR)	307 mOhm Max	124 mOhm Max	Substitute Superior
Core Material	Ferrite	Ferrite	Exact Match
Shielding	Shielded	Shielded	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
Package Size	4.00mm x 4.00mm	4.00mm x 4.00mm	Exact Match
Height - Seated (Max)	1.20mm	1.80mm	Substitute Taller
Operating Temperature	-25°C ~ 100°C	-40°C ~ 105°C	Substitute Wider Range
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match

Engineering Selection Recommendations

The VLCF4018T-6R8NR94-2 is the qualified substitute for the obsolete ASPI-0412S-6R8N-T3. Selection is based on:

Active product status ensuring ongoing availability and supply chain support
Identical inductance value and tolerance specification
Identical core material, shielding configuration, and mounting type
Identical base footprint dimensions (4.00mm x 4.00mm)
Superior DC resistance performance (124 mOhm vs. 307 mOhm maximum)
Higher continuous current rating (940 mA vs. 780 mA)
Extended operating temperature range (-40°C ~ 105°C vs. -25°C ~ 100°C)
Full ROHS3 compliance and REACH unaffected status
Packaging available in Tape & Reel format for production efficiency

The substitute part provides enhanced electrical performance with no functional or mechanical incompatibility. Height difference (1.80mm vs. 1.20mm seated) must be verified against PCB layout clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can VLCF4018T-6R8NR94-2 directly replace ASPI-0412S-6R8N-T3 in existing designs?

A: Yes. Both parts share identical inductance (6.8 µH), tolerance (±30%), core material (ferrite), shielding, mounting type (surface mount), and base footprint (4.00mm x 4.00mm). The substitute offers superior DC resistance and higher current rating. PCB layout must accommodate the increased seated height (1.80mm vs. 1.20mm).

Q: What is the significance of the lower DC resistance in the substitute part?

A: Lower DC resistance (124 mOhm vs. 307 mOhm) reduces resistive losses and heat generation during operation. This improves efficiency and thermal performance, particularly in applications operating near the 780 mA current rating.

Q: Does the substitute part meet the same compliance requirements?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected. Compliance certifications are equivalent.

Q: Is the extended operating temperature range of the substitute part significant?

A: The substitute supports -40°C ~ 105°C versus -25°C ~ 100°C for the original. This provides additional margin for extreme environment applications. For designs operating within the original temperature range, both parts are functionally equivalent.

Q: What is the impact of the increased saturation current specification?

A: The substitute saturation current (940 mA) meets the original requirement (980 mA minimum). This indicates the substitute maintains adequate current handling capability without saturation-induced inductance degradation at the specified operating point.

Q: Are there packaging considerations for production transition?

A: The substitute is available in Tape & Reel packaging, standard for automated assembly. The original part status is obsolete. Transition to the substitute is recommended for new production to ensure supply continuity.

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