1008HS-331EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HS-331EKFS is a 330 nH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, designed for surface mount applications in the 1008 (2520 Metric) package. This component delivers 1.1 A current rating with 200 mOhm DC resistance and operates across the -40°C to 85°C temperature range. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

1008HS-331EKFS

Delta Electronics/ComponentsIn Stock: 9511008HS-331EKFS Datasheet

Current PartRFQ

NLV25T-R33J-EF

TDK CorporationIn Stock: 14753NLV25T-R33J-EF Datasheet

SimilarRFQ

NLV25T-R33J-EFD

TDK CorporationIn Stock: 1945NLV25T-R33J-EFD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1008HS-331EKFS is determined by the following critical parameters:

Mandatory Matching Criteria:

• Inductance value: 330 nH
• Package type: 1008 (2520 Metric) surface mount
• Core material: Ferrite, unshielded drum core wirewound construction
• Test frequency: 25.2 MHz
• Self resonant frequency: 400 MHz
• Q factor @ 25.2 MHz: 30

Allowable Parameter Variations:

• Current rating: Substitute must support minimum 1.1 A (higher ratings acceptable)
• DC resistance: Substitute DCR must not exceed 200 mOhm (lower values acceptable)
• Inductance tolerance: ±5% or ±10% acceptable
• Operating temperature: Minimum -40°C to 85°C (extended ranges acceptable)
• RoHS and MSL compliance: ROHS3 Compliant, MSL 1 required

The identified substitute parts NLV25T-R33J-EF and NLV25T-R33J-EFD from TDK Corporation share identical inductance, package, core material, and frequency characteristics. However, both substitutes present reduced current ratings (400 mA versus 1.1 A) and increased DC resistance (600 mOhm maximum versus 200 mOhm), requiring application-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

NLV25T-R33J-EF Selection Criteria: This TDK substitute maintains active product status and full ROHS3 compliance. The part delivers identical inductance, Q factor, and self-resonant frequency specifications. The extended operating temperature range (-40°C to 105°C) provides thermal margin beyond the original 1008HS-331EKFS specification. Selection is appropriate for applications where circuit current requirements do not exceed 400 mA and where the increased 600 mOhm DCR does not compromise circuit performance.

NLV25T-R33J-EFD Selection Criteria: This variant provides identical electrical and mechanical specifications to NLV25T-R33J-EF with the addition of AEC-Q200 automotive qualification. This part is suitable for automotive and high-reliability applications requiring formal automotive component certification. The AEC-Q200 rating provides documented qualification for automotive temperature cycling, vibration, and environmental stress conditions.

Current Rating Limitation: Both TDK substitutes operate at 400 mA maximum current, representing a 64% reduction from the original 1.1 A rating. Applications requiring the full 1.1 A current capacity cannot use these substitutes without circuit redesign or parallel component configuration.

DC Resistance Impact: The 600 mOhm maximum DCR of TDK substitutes represents a 3× increase from the original 200 mOhm specification. This increased resistance generates proportionally higher power dissipation in high-current applications and may affect circuit Q factor and frequency response characteristics.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-R33J-EF or NLV25T-R33J-EFD be used as direct drop-in replacements for 1008HS-331EKFS?

A: Physical package compatibility is confirmed; both substitute parts use the 1008 (2520 Metric) surface mount package with identical footprint dimensions. However, electrical compatibility depends on application current requirements. If circuit current does not exceed 400 mA and the increased 600 mOhm DCR is acceptable, direct substitution is feasible. Applications requiring 1.1 A current capacity require alternative solutions.

Q: What is the difference between NLV25T-R33J-EF and NLV25T-R33J-EFD?

A: Both parts share identical electrical specifications, inductance value, current rating, and DC resistance. The primary distinction is AEC-Q200 automotive qualification present in the NLV25T-R33J-EFD variant. Selection between these parts depends on whether automotive certification is required for the application.

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

A: The 600 mOhm maximum DCR of TDK substitutes generates increased resistive losses compared to the original 200 mOhm specification. In applications carrying 400 mA, this results in approximately 96 mW additional power dissipation at maximum current. Circuit designers must evaluate whether this increased dissipation affects thermal management, efficiency, or frequency response characteristics.

Q: Are the TDK substitutes available in the same packaging format as the original part?

A: Both NLV25T-R33J-EF and NLV25T-R33J-EFD are supplied in Tape & Reel (TR) packaging, which differs from the original part's packaging specification. Tape & Reel format is standard for high-volume surface mount assembly and is compatible with automated pick-and-place equipment.

Q: What compliance certifications apply to these substitute parts?

A: All three parts (original and both substitutes) maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. The NLV25T-R33J-EFD additionally carries AEC-Q200 automotive qualification. REACH status differs: the original part is REACH Unaffected, while both TDK substitutes are REACH Affected.

Q: Can multiple substitute parts be paralleled to achieve the original 1.1 A current rating?

A: Parallel configuration of inductors requires careful design consideration including current distribution, coupling effects, and resonant frequency shifts. This approach is not addressed by the provided component specifications and requires detailed circuit analysis.