1008HS-391EKFS

Part Overview

The 1008HS-391EKFS is a 390 nH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components. This surface mount component is rated for 700 mA with a DC resistance of 400 mOhm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, necessitating the identification of alternative components that maintain functional equivalence within specified electrical and mechanical parameters.

Substiute Parts

1008HS-391EKFS

Delta Electronics/ComponentsIn Stock: 12051008HS-391EKFS Datasheet

Current PartRFQ

NLV25T-R39J-EF

TDK CorporationIn Stock: 900NLV25T-R39J-EF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 1008HS-391EKFS is based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 390 nH (within tolerance bands)
• Core type: Ferrite drum core wirewound construction
• Package format: 1008 (2520 Metric) surface mount
• Self resonant frequency: 375 MHz
• Q factor: 30 @ 25.2 MHz

Allowable Variation Parameters:

• Current rating: Component must support minimum circuit current requirements
• DC resistance: Determines power dissipation characteristics
• Operating temperature range: Must encompass circuit operating conditions
• Inductance tolerance: ±10% or better provides functional equivalence

The substitute part NLV25T-R39J-EF from TDK Corporation meets these core criteria through identical inductance specification, matching ferrite core construction, and identical package designation.

Parameter Comparison

Engineering Selection Recommendations

The NLV25T-R39J-EF serves as a functional substitute for the obsolete 1008HS-391EKFS based on the following technical criteria:

Compliance & Status: The substitute part maintains ROHS3 compliance identical to the original specification. The TDK component is in active production status, ensuring long-term availability and supply chain reliability compared to the obsolete Delta part.

Electrical Equivalence: Both components share identical inductance value (390 nH) and equivalent Q characteristics (30 @ 25.2 MHz), matching the resonant frequency at 375 MHz. Inductance tolerance is tighter in the substitute (±5% vs ±10%), providing superior precision.

Circuit Integration: The substitute exhibits higher DC resistance (650 mOhm vs 400 mOhm) and lower current rating (375 mA vs 700 mA). Substitution is appropriate for circuits where the required operating current does not exceed the TDK component's 375 mA specification. The elevated DC resistance increases dissipation and should be evaluated in power-sensitive applications.

Physical & Environmental: Physical dimensions are smaller in the substitute (0.098" L x 0.079" W vs 0.115" L x 0.110" W) within the same 1008 package category. Extended operating temperature range (-40°C to 105°C) in the substitute accommodates wider thermal environments.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-R39J-EF replace the 1008HS-391EKFS in all applications?

A: Substitution is valid for circuits where the operating current remains below 375 mA. Applications exceeding this current threshold require evaluation of the original specification or alternative components with higher current ratings.

Q: How does the higher DC resistance of the substitute affect circuit performance?

A: DC resistance determines resistive losses and heat dissipation in inductor operation. The substitute's 650 mOhm specification versus the original 400 mOhm results in increased power dissipation. Circuit designs sensitive to inductor losses should account for this difference in thermal and efficiency calculations.

Q: Are both components identical in physical dimensions?

A: Both components utilize the 1008 (2520 Metric) package designation, but the NLV25T-R39J-EF exhibits smaller physical dimensions (0.098" L x 0.079" W versus 0.115" L x 0.110" W). Both components fit the same PCB footprint as the package standard defines the mounting interface.

Q: What compliance and regulatory differences exist between these parts?

A: Both components achieve ROHS3 compliance. The substitute is classified as REACH Affected while the original carries REACH Unaffected status. Both components maintain unlimited moisture sensitivity (MSL 1) and identical EAR99 ECCN classification.

Q: Is the tighter tolerance of the substitute part beneficial?

A: The NLV25T-R39J-EF provides ±5% inductance tolerance compared to the original ±10%. Tighter tolerance reduces inductance variation and provides superior consistency across production batches, benefiting applications with narrow inductance requirements.