1008HC-392EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HC-392EKFS is a 3.9 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 450 mA continuous current with 800mOhm DC resistance. This surface mount component is packaged in the 1008 (2520 Metric) form factor and operates across the -40°C to 85°C temperature range. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

1008HC-392EKFS

Delta Electronics/ComponentsIn Stock: 11271008HC-392EKFS Datasheet

Current PartRFQ

NLV25T-3R9J-EF

TDK CorporationIn Stock: 2190NLV25T-3R9J-EF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1008HC-392EKFS is determined by the following critical parameters:

Mandatory Matching Criteria:

• Inductance value: 3.9 µH (tolerance variations acceptable within engineering limits)
• Package / Case: 1008 (2520 Metric) form factor
• Core material: Ferrite drum core construction
• Mounting type: Surface mount
• Shielding configuration: Unshielded

Allowable Parameter Variations:

• Current rating may differ; substitute must support the application's maximum current requirement
• DC resistance (DCR) may vary; lower DCR values are generally acceptable
• Operating temperature range may extend beyond the original specification
• Tolerance may be tighter (±5% vs. ±10%)
• RoHS and REACH compliance status may differ

The NLV25T-3R9J-EF from TDK Corporation meets all mandatory matching criteria and is classified as an active product, providing long-term availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Current Rating Compatibility

The NLV25T-3R9J-EF is rated for 180 mA maximum continuous current, compared to the 1008HC-392EKFS rating of 450 mA. This represents a significant derating. The TDK substitute is suitable only for applications where the actual circuit current does not exceed 180 mA. If the design requires the full 450 mA capability of the original part, the NLV25T-3R9J-EF is not a direct functional equivalent.

Secondary Consideration: DC Resistance (DCR)

The NLV25T-3R9J-EF exhibits substantially higher DC resistance (2.1 Ohm Max vs. 800 mOhm). This increased resistance will result in greater power dissipation and voltage drop across the inductor. Circuit designs sensitive to DCR performance must account for this difference.

Compliance and Availability

Both parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity). The NLV25T-3R9J-EF carries active product status from TDK Corporation, ensuring long-term supply chain availability. The 1008HC-392EKFS is obsolete and subject to inventory depletion.

Physical Form Factor

The TDK substitute occupies a smaller physical footprint (2.50mm x 2.00mm vs. 2.92mm x 2.79mm) with a lower seated height (1.90mm vs. 2.10mm). PCB layout modifications may be required, but the reduced size may provide design flexibility in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-3R9J-EF directly replace the 1008HC-392EKFS in all applications?

A: No. The NLV25T-3R9J-EF is suitable only for applications where circuit current remains below 180 mA. If your design requires the full 450 mA rating of the original part, this substitute is not appropriate. Additionally, the significantly higher DCR (2.1 Ohm vs. 800 mOhm) must be evaluated for impact on circuit performance.

Q: What is the impact of the higher DC resistance in the TDK part?

A: Higher DCR increases resistive losses in the inductor. At 180 mA, the TDK part dissipates approximately 68.4 mW (180 mA² × 2.1 Ohm), while the Delta part at the same current would dissipate approximately 25.9 mW (180 mA² × 0.8 Ohm). This difference affects thermal management and overall circuit efficiency.

Q: Are both parts compatible with the same PCB footprint?

A: Both parts use the 1008 (2520 Metric) package designation and surface mount technology. However, the TDK part has smaller physical dimensions. Existing PCB layouts designed for the Delta part will accommodate the TDK part, but the reverse is not guaranteed. Verify pad spacing and clearance requirements.

Q: What is the significance of the product status difference?

A: The 1008HC-392EKFS is classified as obsolete, indicating Delta Electronics/Components has discontinued production. Existing inventory will eventually deplete. The NLV25T-3R9J-EF is active, meaning TDK continues manufacturing and supporting this part for long-term availability.

Q: How do the tolerance specifications compare?

A: The NLV25T-3R9J-EF offers ±5% inductance tolerance, compared to ±10% for the 1008HC-392EKFS. Tighter tolerance may benefit applications requiring precise inductance values, but both parts meet the 3.9 µH nominal specification.

Q: Are there temperature range considerations?

A: The NLV25T-3R9J-EF operates to 105°C maximum, extending 20°C beyond the 1008HC-392EKFS specification of 85°C. This provides additional thermal margin in high-temperature environments, though the original design specification should be verified.