1008HC-123EJFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HC-123EJFS is a 12 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 280 mA continuous current with 1.7 Ohm DC resistance. This surface mount component is designed for applications requiring compact inductance in the 1008 (2520 Metric) package format.

The 1008HC-123EJFS has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this inductor specification.

Substiute Parts

1008HC-123EJFS

Delta Electronics/ComponentsIn Stock: 10431008HC-123EJFS Datasheet

Current PartRFQ

NLV25T-120J-EF

TDK CorporationIn Stock: 2166NLV25T-120J-EF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1008HC-123EJFS must satisfy the following core electrical and mechanical criteria:

Mandatory Matching Parameters:

• Inductance value: 12 µH
• Inductance tolerance: ±5%
• Package / Case: 1008 (2520 Metric)
• Core type: Ferrite drum core
• Shielding configuration: Unshielded
• Mounting type: Surface mount

Allowable Parameter Variations:

• Current rating may be lower than the original 280 mA specification, provided the substitute part meets the application's actual current requirements
• DC resistance may differ from 1.7 Ohm, as long as the substitute part's resistance is documented and acceptable for the circuit design
• Operating temperature range may extend beyond the original -40°C ~ 85°C specification
• RoHS and REACH compliance status may differ, subject to regulatory requirements of the end application

The substitute part NLV25T-120J-EF from TDK Corporation meets the mandatory matching criteria for inductance, tolerance, package format, core material, shielding, and mounting type. This part is suitable for applications where the current requirement does not exceed 150 mA and where the higher DC resistance of 3.8 Ohm is acceptable for circuit operation.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 1008HC-123EJFS is classified as obsolete, while the NLV25T-120J-EF substitute is active and in production. The active status of the TDK part ensures ongoing availability and supply chain stability for new designs and production continuity.

Compliance and Certification: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, indicating equivalent environmental handling and storage requirements. The NLV25T-120J-EF carries REACH Affected status, whereas the original part is REACH Unaffected; compliance verification against specific regulatory requirements is necessary based on end-use application geography and industry standards.

Current Rating Limitation: The substitute part NLV25T-120J-EF is rated for 150 mA maximum continuous current, compared to the original 280 mA rating. Selection of this substitute is appropriate only for applications where the actual circuit current requirement does not exceed 150 mA. For applications requiring the full 280 mA current capacity of the original part, alternative substitutes with higher current ratings must be evaluated.

DC Resistance Impact: The NLV25T-120J-EF exhibits 3.8 Ohm maximum DC resistance, compared to 1.7 Ohm for the original part. This 2.1 Ohm increase in series resistance will result in higher power dissipation and voltage drop across the inductor. Circuit analysis is required to confirm that this resistance increase does not degrade circuit performance, efficiency, or thermal characteristics.

Physical Dimensions: The substitute part is physically smaller in length, width, and height compared to the original. PCB layout modifications may be necessary to accommodate the different footprint dimensions.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-120J-EF directly replace the 1008HC-123EJFS in all applications?

A: Direct replacement is possible only when the application current requirement does not exceed 150 mA and the higher DC resistance of 3.8 Ohm is acceptable for circuit operation. Applications requiring the full 280 mA current capacity or lower resistance characteristics require alternative substitute evaluation.

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

A: The increase from 1.7 Ohm to 3.8 Ohm maximum DC resistance results in higher I²R power dissipation and increased voltage drop across the inductor. For a 150 mA current, the voltage drop increases from 0.255 V to 0.57 V maximum. Circuit performance, thermal management, and efficiency must be re-evaluated with the substitute part specifications.

Q: Are the physical dimensions compatible with the original PCB layout?

A: The substitute part is smaller in all dimensions (length, width, and height). While the 1008 (2520 Metric) package classification is identical, the actual footprint differs. PCB layout review and potential modification are necessary to accommodate the smaller physical dimensions of the NLV25T-120J-EF.

Q: What are the compliance differences between the two parts?

A: Both parts are ROHS3 compliant and carry MSL 1 rating. The primary difference is REACH status: the original part is REACH Unaffected, while the substitute is REACH Affected. Verification against specific regulatory requirements for the end-use application is necessary.

Q: Is the extended operating temperature range of the substitute part beneficial?

A: The NLV25T-120J-EF operates from -40°C to 105°C, compared to -40°C to 85°C for the original part. This extended upper temperature limit provides additional thermal margin for applications operating at elevated temperatures, but does not affect applications within the original temperature range.

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

A: The NLV25T-120J-EF is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. Verify that your assembly process and equipment are compatible with this packaging format.

Q: How do the Q factor specifications compare?

A: The substitute part exhibits Q of 25 at 2.52 MHz, compared to Q of 20 for the original part. The higher Q factor indicates lower losses and better efficiency at the test frequency. Both parts share the same 30 MHz self-resonant frequency.