Equivalent & Substitute Parts for 1008HS-181EKFS

Part Overview

The 1008HS-181EKFS is a 180 nH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 1.2 A continuous current with 200 mOhm DC resistance. This surface mount component is packaged in the 1008 (2520 Metric) form factor and operates across the temperature range of -40°C to 85°C.

The 1008HS-181EKFS carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductance value and current rating.

Substiute Parts

1008HS-181EKFS

Delta Electronics/ComponentsIn Stock: 10871008HS-181EKFS Datasheet

Current PartRFQ

NLV25T-R18J-EF

TDK CorporationIn Stock: 4034NLV25T-R18J-EF Datasheet

SimilarRFQ

NLV25T-R18J-EFD

TDK CorporationIn Stock: 1061NLV25T-R18J-EFD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1008HS-181EKFS are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 180 nH (exact match required)
• Package / Case: 1008 (2520 Metric) (exact match required)
• Core type: Ferrite drum core, wirewound, unshielded (exact match required)
• Mounting type: Surface mount (exact match required)
• Q factor @ 25.2 MHz: 30 (exact match)

Secondary Compatibility Parameters:

• Tolerance: ±10% (main part) vs. ±5% (substitute parts) — substitute parts offer tighter tolerance
• DC Resistance: 200 mOhm (main part) vs. 400 mOhm Max (substitute parts) — substitute parts have higher DCR
• Current Rating: 1.2 A (main part) vs. 460 mA (substitute parts) — substitute parts have lower current rating
• Operating Temperature: -40°C to 85°C (main part) vs. -40°C to 105°C (substitute parts) — substitute parts support extended upper temperature limit

The substitute parts NLV25T-R18J-EF and NLV25T-R18J-EFD from TDK Corporation match the core inductance, package, and RF characteristics. However, substitution requires design verification for current-carrying capacity and DC resistance impact on the application circuit.

Parameter Comparison

Engineering Selection Recommendations

For NLV25T-R18J-EF (TDK): This part is active and in production, providing long-term supply availability. It maintains the same inductance value, package footprint, and RF characteristics as the obsolete 1008HS-181EKFS. The part carries ROHS3 compliance and unlimited moisture sensitivity rating. Selection of this part is appropriate for applications where the reduced current rating (460 mA vs. 1.2 A) and increased DC resistance (400 mOhm Max vs. 200 mOhm) do not impact circuit performance. The extended operating temperature range (-40°C to 105°C) provides additional thermal margin.

For NLV25T-R18J-EFD (TDK): This variant is functionally identical to NLV25T-R18J-EF but includes AEC-Q200 automotive qualification. Selection of this part is required for automotive applications or designs requiring automotive-grade component certification. The AEC-Q200 rating confirms compliance with automotive reliability and quality standards.

Substitution Constraints: Both substitute parts operate at reduced current ratings compared to the original 1008HS-181EKFS. Applications requiring continuous current above 460 mA cannot use these substitutes without circuit redesign. The doubled DC resistance of the substitute parts will increase power dissipation in series current paths and must be evaluated against thermal and efficiency requirements.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-R18J-EF or NLV25T-R18J-EFD be used as direct drop-in replacements for 1008HS-181EKFS?

A: Physical and electrical compatibility exists for the 180 nH inductance value, 1008 package footprint, and RF characteristics. However, the reduced current rating (460 mA vs. 1.2 A) and increased DC resistance (400 mOhm Max vs. 200 mOhm) require circuit analysis to confirm functional equivalence. Direct substitution is valid only when application current does not exceed 460 mA and the higher DCR does not degrade circuit performance.

Q: What is the difference between NLV25T-R18J-EF and NLV25T-R18J-EFD?

A: Both parts are electrically and mechanically identical. The primary difference is that NLV25T-R18J-EFD carries AEC-Q200 automotive qualification, while NLV25T-R18J-EF does not. Selection between these variants depends on whether automotive-grade certification is required by the application or end-use specification.

Q: Why do the substitute parts have higher DC resistance?

A: The substitute parts from TDK are rated for lower continuous current (460 mA vs. 1.2 A). The inductor design reflects this lower current rating, resulting in higher DC resistance. This is a fundamental design trade-off in inductor construction and does not indicate a defect.

Q: Are the substitute parts available in the same packaging format?

A: Yes. Both NLV25T-R18J-EF and NLV25T-R18J-EFD are supplied in Tape & Reel (TR) packaging in the 1008 (2520 Metric) form factor, compatible with automated assembly equipment used for the original 1008HS-181EKFS.

Q: What is the impact of the lower self-resonant frequency in the substitute parts?

A: The substitute parts have a self-resonant frequency of 500 MHz compared to 600 MHz for the original part. This 100 MHz difference may affect high-frequency circuit behavior. Applications operating near or above 500 MHz require verification that the lower self-resonant frequency does not introduce unintended impedance characteristics.

Q: Do the substitute parts meet RoHS and environmental compliance requirements?

A: Yes. Both NLV25T-R18J-EF and NLV25T-R18J-EFD are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Both carry REACH Affected status, indicating they are subject to REACH regulatory requirements. The original 1008HS-181EKFS is ROHS3 compliant with REACH Unaffected status.