1008HC-392EJFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HC-392EJFS 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 designed for applications requiring compact inductance in the 1008 (2520 Metric) package format.

The 1008HC-392EJFS is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or redesign initiatives.

Substiute Parts

1008HC-392EJFS

Delta Electronics/ComponentsIn Stock: 9981008HC-392EJFS Datasheet

Current PartRFQ

NLV25T-3R9J-EF

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1008HC-392EJFS must satisfy the following mandatory electrical and mechanical criteria:

Electrical Parameters (Critical for Substitution):

• Inductance value: 3.9 µH (±5% tolerance acceptable)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Test frequency: 7.96 MHz
• Package classification: 1008 (2520 Metric)

Mechanical Parameters (Critical for Substitution):

• Mounting type: Surface Mount
• Physical package: 1008 (2520 Metric)

Compliance Parameters:

• RoHS3 compliance required
• Moisture Sensitivity Level 1 acceptable

Parameters Allowing Variation:

• Current rating (may be lower or higher depending on application requirements)
• DC resistance (varies with wire gauge and design)
• Operating temperature range (may extend beyond original specification)
• Product status (active parts preferred for obsolete replacements)

The substitute part NLV25T-3R9J-EF from TDK Corporation meets all mandatory electrical and mechanical criteria while offering active product status and extended temperature range.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The NLV25T-3R9J-EF from TDK Corporation is a direct electrical and mechanical substitute for the 1008HC-392EJFS based on matching inductance value, tolerance, core type, shielding configuration, and package format.

Critical Selection Factors:

1. Current Rating Differential: The TDK substitute is rated for 180 mA maximum continuous current, compared to 450 mA for the Delta part. Applications requiring current levels above 180 mA cannot use this substitute without thermal analysis and potential performance degradation.

2. DC Resistance Increase: The TDK part exhibits 2.1 Ohm maximum DC resistance versus 800 mOhm for the original part. This 2.6× increase in DCR results in higher power dissipation (I²R losses). For applications sensitive to heat generation or efficiency, this parameter difference requires evaluation.

3. Product Status Advantage: The NLV25T-3R9J-EF is active production status, ensuring long-term supply availability and manufacturing consistency compared to the obsolete 1008HC-392EJFS.

4. Temperature Range Extension: The TDK substitute supports -40°C to 105°C operation, providing 20°C additional upper temperature margin compared to the original -40°C to 85°C specification.

5. Compliance Alignment: Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility.

Selection Guidance:

• Use NLV25T-3R9J-EF for applications where circuit current does not exceed 180 mA and where increased DCR is acceptable.
• For applications requiring the full 450 mA current rating or lower DCR performance, alternative 3.9 µH inductors in 1008 package format from other manufacturers must be evaluated.

Frequently Asked Questions (FAQ)

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

A: Direct replacement is possible only when application current requirements do not exceed 180 mA. The TDK substitute has lower current rating and higher DC resistance than the original part. Circuit performance must be verified for applications operating near or above 180 mA.

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

A: The NLV25T-3R9J-EF exhibits 2.1 Ohm maximum DCR compared to 800 mOhm in the original part. At 180 mA, this produces approximately 648 mW power dissipation in the inductor itself. Applications with strict thermal budgets or efficiency requirements must account for this increased dissipation.

Q: Are the physical packages identical?

A: Both parts use the 1008 (2520 Metric) surface mount package. Physical dimensions differ slightly: the Delta part measures 0.115" L × 0.110" W × 0.083" H (max), while the TDK part measures 0.098" L × 0.079" W × 0.075" H (max). Both fit standard 1008 footprints, though the TDK part is physically smaller.

Q: What is the difference in Q factor between these parts?

A: The TDK substitute has Q = 30 @ 7.96 MHz compared to Q = 25 @ 7.96 MHz for the original part. The higher Q factor in the TDK part indicates lower losses at the test frequency, which is beneficial for RF and filtering applications.

Q: Are there compliance or regulatory differences?

A: Both parts are ROHS3 compliant with MSL Level 1 rating. The TDK part is REACH Affected, while the original part is REACH Unaffected. Applications subject to REACH regulations must verify compliance requirements with supply chain documentation.

Q: What is the self-resonant frequency difference?

A: The original part has SRF = 50 MHz; the TDK substitute has SRF = 48 MHz. This 2 MHz difference is negligible for most applications and does not affect substitution feasibility.

Q: Can I use the TDK substitute in high-temperature applications?

A: The NLV25T-3R9J-EF supports operation to 105°C, providing 20°C additional margin compared to the original 85°C maximum. This makes the TDK part suitable for elevated temperature environments where the original part would exceed its rating.