1008HS-392EJFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HS-392EJFS is a 3.9 µH 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 310 mA current rating with 1.25Ohm DC resistance and is rated for -40°C to 85°C operating temperature range.

The 1008HS-392EJFS 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-392EJFS

Delta Electronics/ComponentsIn Stock: 9631008HS-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 1008HS-392EJFS are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 3.9 µH ±5% tolerance
• Package / Case: 1008 (2520 Metric) surface mount
• Core type: Ferrite drum core, unshielded
• Test frequency: 7.96 MHz
• Self resonant frequency: 48 MHz

Secondary Compatibility Factors:

• Operating temperature range compatibility
• RoHS and regulatory compliance status
• Moisture sensitivity level (MSL)
• Physical dimensions within package specification

The substitute part NLV25T-3R9J-EF matches all primary criteria. Differences in current rating (180 mA vs. 310 mA), DC resistance (2.1Ohm Max vs. 1.25Ohm), and operating temperature upper limit (105°C vs. 85°C) must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The NLV25T-3R9J-EF is an active product substitute for the obsolete 1008HS-392EJFS. Both components share identical inductance values, package specifications, core materials, and test frequencies, establishing functional equivalence at the circuit level.

Critical Considerations for Selection:

1. Current Rating Differential: The substitute part is rated for 180 mA maximum current, compared to 310 mA for the main part. Applications requiring current levels exceeding 180 mA cannot use this substitute without thermal and performance degradation.

2. DC Resistance Increase: The substitute exhibits 2.1Ohm maximum DC resistance versus 1.25Ohm for the original part. This 68% increase in resistance will result in higher power dissipation in current-carrying applications. Thermal analysis is required for high-current circuits.

3. Operating Temperature Range: The 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. This represents an advantage for elevated-temperature environments.

4. Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings. The substitute carries REACH Affected status versus REACH Unaffected for the original part.

5. Product Status: The substitute is an active product with confirmed inventory availability (2100 Pcs), ensuring long-term supply chain continuity compared to the obsolete status of the original part.

Selection Logic:

• Select NLV25T-3R9J-EF when circuit current requirements do not exceed 180 mA and DC resistance increase is acceptable for the application.
• Retain 1008HS-392EJFS only if current rating of 310 mA or DC resistance of 1.25Ohm is mandatory and cannot be redesigned.
• Evaluate thermal performance impact when substituting due to increased DC resistance.

Frequently Asked Questions (FAQ)

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

A: Direct replacement is possible only when circuit current requirements do not exceed 180 mA. The substitute part has a lower current rating (180 mA vs. 310 mA) and higher DC resistance (2.1Ohm vs. 1.25Ohm). Applications operating at currents above 180 mA will experience saturation and excessive power dissipation with the substitute part.

Q: What is the impact of the increased DC resistance on circuit performance?

A: The NLV25T-3R9J-EF exhibits 2.1Ohm maximum DC resistance compared to 1.25Ohm for the 1008HS-392EJFS. This 68% increase results in higher resistive losses, increased heat generation, and potential voltage drop across the inductor. Power dissipation calculations must be performed for the specific application current to determine acceptability.

Q: Are the physical dimensions compatible between these parts?

A: Both parts use the 1008 (2520 Metric) package specification. However, physical dimensions differ slightly: the main part measures 0.115" L x 0.110" W with 0.083" maximum seated height, while the substitute measures 0.098" L x 0.079" W with 0.075" maximum seated height. The substitute is physically smaller and will fit in the same PCB footprint with additional clearance margin.

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

A: At 7.96 MHz test frequency, the main part exhibits Q of 25, while the substitute part exhibits Q of 30. The higher Q factor of the substitute indicates lower losses at the test frequency, which is a performance advantage. However, this does not offset the disadvantage of increased DC resistance at DC and low-frequency operation.

Q: Are both parts compliant with current regulatory requirements?

A: Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) ratings. The main part is REACH Unaffected, while the substitute is REACH Affected. For applications subject to REACH regulations, the substitute part status must be verified against specific regulatory requirements in the target market.

Q: What is the operating temperature range difference?

A: The main part operates from -40°C to 85°C, while the substitute operates from -40°C to 105°C. The substitute provides 20°C additional upper temperature margin. For applications operating near or above 85°C, the substitute part offers improved thermal headroom.

Q: How do the self-resonant frequencies compare?

A: Both parts have identical self-resonant frequencies of 48 MHz, indicating equivalent high-frequency behavior and parasitic characteristics. This parameter does not differentiate the parts for substitution purposes.

Q: What packaging format is available for the substitute part?

A: The NLV25T-3R9J-EF is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes. The main part packaging format is not specified in the provided data.