1008HS-121EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HS-121EKFS is a 120 nH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, designed for surface mount applications in the 1008 (2520 Metric) package. This component operates at 1.2 A current rating with 100 mOhm DC resistance and is rated for -40°C to 85°C operating temperature range.

The 1008HS-121EKFS 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 inductor specification.

Substiute Parts

1008HS-121EKFS

Delta Electronics/ComponentsIn Stock: 10651008HS-121EKFS Datasheet

Current PartRFQ

NLV25T-R12J-EF

TDK CorporationIn Stock: 47478NLV25T-R12J-EF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1008HS-121EKFS must satisfy the following critical parameters to ensure functional equivalence:

Mandatory Matching Parameters:

• Inductance value: 120 nH
• Package / Case: 1008 (2520 Metric)
• Core type: Ferrite drum core, wirewound
• Shielding configuration: Unshielded
• Mounting type: Surface mount
• Inductance test frequency: 25.2 MHz

Allowable Parameter Variations: Substitute parts may differ in current rating, DC resistance, operating temperature range, and tolerance specifications, provided the application requirements permit such variations. The inductance value and physical package must remain identical to ensure mechanical and electrical compatibility.

The NLV25T-R12J-EF from TDK Corporation qualifies as a substitute part, meeting all mandatory matching parameters while offering different electrical performance characteristics in current handling and resistance specifications.

Parameter Comparison

Engineering Selection Recommendations

1008HS-121EKFS (Delta Electronics/Components)

This part carries obsolete product status. While 966 pieces remain in current inventory, long-term availability cannot be assured. Selection of this part is appropriate only for existing stock utilization or legacy system maintenance where no design modifications are permissible.

NLV25T-R12J-EF (TDK Corporation)

This part maintains active product status with 47,456 pieces in inventory, ensuring sustained supply chain availability. The NLV25T-R12J-EF is ROHS3 compliant and REACH affected. Selection of this substitute is appropriate for new designs, production continuity, and applications where the reduced current rating (550 mA versus 1.2 A) and increased DC resistance (300 mOhm maximum versus 100 mOhm) are within design tolerances.

The NLV25T-R12J-EF offers superior inductance tolerance (±5% versus ±10%) and extended operating temperature range (-40°C to 105°C versus -40°C to 85°C), providing enhanced performance margins in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-R12J-EF directly replace the 1008HS-121EKFS in existing designs?

A: Direct replacement is possible only if the application current requirement does not exceed 550 mA. The NLV25T-R12J-EF is rated for 550 mA maximum, compared to the 1008HS-121EKFS rating of 1.2 A. If the circuit draws current above 550 mA, the substitute part will not function within specification. Additionally, the increased DC resistance (300 mOhm maximum versus 100 mOhm) will result in higher power dissipation and voltage drop across the inductor.

Q: What are the physical compatibility considerations?

A: Both parts use the 1008 (2520 Metric) surface mount package with identical footprints. The 1008HS-121EKFS has a maximum seated height of 0.083" (2.10 mm), while the NLV25T-R12J-EF has a maximum seated height of 0.075" (1.90 mm). Both parts are compatible with standard 1008 PCB land patterns. The NLV25T-R12J-EF occupies slightly less vertical space, which may be advantageous in height-constrained applications.

Q: How do the inductance tolerances affect circuit performance?

A: The 1008HS-121EKFS specifies ±10% inductance tolerance, while the NLV25T-R12J-EF specifies ±5% tolerance. The tighter tolerance of the substitute part reduces inductance variation across the production batch, resulting in more consistent circuit performance. For applications sensitive to inductance variation, the NLV25T-R12J-EF provides superior consistency.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and carry Moisture Sensitivity Level 1 (unlimited). The NLV25T-R12J-EF is REACH affected, while the 1008HS-121EKFS is REACH unaffected. Applications subject to REACH regulations must account for this distinction. Both parts carry ECCN classification EAR99.

Q: What is the impact of the different self-resonant frequencies?

A: The 1008HS-121EKFS has a self-resonant frequency of 800 MHz, while the NLV25T-R12J-EF has a self-resonant frequency of 700 MHz. This 100 MHz difference affects the frequency range over which the inductor behaves as a true inductance before transitioning to capacitive behavior. For applications operating near or above 700 MHz, this parameter difference must be evaluated against specific circuit requirements.

Q: What packaging format is available for the NLV25T-R12J-EF?

A: The NLV25T-R12J-EF is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. The 1008HS-121EKFS packaging format is not specified in the provided data.