1008HC-123EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HC-123EKFS 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-123EKFS has reached obsolete product status. Locating equivalent or substitute inductors is necessary to support ongoing production requirements, field repairs, and design continuity. Substitute parts must maintain electrical performance within acceptable operating parameters while meeting current manufacturing and compliance standards.

Substiute Parts

1008HC-123EKFS

Delta Electronics/ComponentsIn Stock: 11081008HC-123EKFS Datasheet

Current PartRFQ

NLV25T-120J-EF

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute inductors for the 1008HC-123EKFS must satisfy the following criteria based on provided electrical and mechanical parameters:

Mandatory Matching Parameters:

• Inductance value: 12 µH (exact match required)
• Package format: 1008 (2520 Metric) surface mount
• Core type: Drum core, wirewound, ferrite material
• Frequency test point: 2.52 MHz
• Self-resonant frequency: 30 MHz
• Shielding configuration: Unshielded

Acceptable Parameter Variations:

• Current rating: Substitute must support the application's required current; equal or higher ratings are acceptable
• DC resistance: Lower DCR values improve efficiency; higher values require circuit performance verification
• Tolerance: Tighter tolerances (lower percentage) are acceptable
• Operating temperature: Extended upper temperature limits are acceptable if minimum remains at -40°C or lower
• Product status: Active status preferred over obsolete for long-term availability

Compliance Requirements:

• RoHS3 compliance mandatory
• Moisture sensitivity level 1 (unlimited) required for standard handling

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The NLV25T-120J-EF (TDK Corporation) is listed as an equivalent substitute for the 1008HC-123EKFS. Both components share identical inductance values (12 µH), self-resonant frequency (30 MHz), operating frequency test point (2.52 MHz), package format (1008 / 2520 Metric), and mounting type (surface mount). Both meet ROHS3 compliance and moisture sensitivity level 1 requirements.

Critical Differences Affecting Selection:

The NLV25T-120J-EF has a current rating of 150 mA compared to the 1008HC-123EKFS rating of 280 mA. Applications requiring continuous current above 150 mA cannot use the TDK substitute without exceeding its rated specifications. The TDK part exhibits higher DC resistance (3.8 Ohm maximum versus 1.7 Ohm), resulting in increased power dissipation in the inductor element.

The TDK substitute offers advantages in product status (active versus obsolete), tolerance specification (±5% versus ±10%), quality factor (25 versus 20 at 2.52 MHz), and operating temperature range extension to 105°C. Physical dimensions are smaller, which may provide PCB layout benefits in space-constrained applications.

Selection Criteria:

• For applications with current requirements ≤150 mA: The NLV25T-120J-EF is suitable as a direct substitute, offering improved availability and extended temperature performance.
• For applications requiring current >150 mA: The NLV25T-120J-EF does not meet electrical specifications. Alternative 12 µH inductors with higher current ratings in the 1008 package must be evaluated.
• For thermal-sensitive designs: The higher DCR of the TDK part (3.8 Ohm) generates additional heat compared to the original 1.7 Ohm specification. Circuit thermal analysis is required.

Compliance Status:

Both components satisfy ROHS3 and moisture sensitivity requirements. The TDK part is REACH Affected; the original part status is REACH Unaffected. Procurement and supply chain documentation must reflect this regulatory difference.

Frequently Asked Questions (FAQ)

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

A: No. The NLV25T-120J-EF has a maximum current rating of 150 mA, while the original part is rated for 280 mA. Substitution is valid only for applications where the inductor current does not exceed 150 mA continuous operation.

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

A: The NLV25T-120J-EF has 3.8 Ohm maximum DC resistance compared to 1.7 Ohm in the original part. This increases power dissipation by approximately 2.1 Ohm × I² (where I is the inductor current in amperes). For a 150 mA current, additional dissipation is approximately 42.75 mW. Circuit thermal design must account for this increase.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The NLV25T-120J-EF is physically smaller (2.50mm × 2.00mm × 1.90mm maximum height) than the 1008HC-123EKFS (2.92mm × 2.79mm × 2.10mm maximum height). The smaller footprint is compatible with 1008 package land patterns and will not cause assembly issues. However, verify that the reduced height does not affect solder joint formation or clearance to adjacent components.

Q: What is the difference in tolerance between the two parts?

A: The 1008HC-123EKFS has ±10% inductance tolerance, while the NLV25T-120J-EF has ±5% tolerance. The tighter tolerance of the TDK part provides better inductance consistency across production batches, which may improve circuit performance in applications sensitive to inductance variation.

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

A: The NLV25T-120J-EF operates to 105°C maximum, compared to 85°C for the original part. This extended range is beneficial for applications in elevated ambient temperature environments or high-power dissipation scenarios. However, the higher DCR of the TDK part generates additional heat, which may offset this advantage in thermally constrained designs.

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

A: The 1008HC-123EKFS is obsolete, meaning Delta Electronics/Components no longer manufactures or supports this part. The NLV25T-120J-EF is active, indicating TDK continues production and maintains supply availability. For new designs or long-term production support, the active status of the TDK part is advantageous.

Q: Are there compliance or regulatory differences between the two parts?

A: Both parts are ROHS3 compliant and have moisture sensitivity level 1 (unlimited). The NLV25T-120J-EF is REACH Affected, while the original part is REACH Unaffected. Organizations subject to REACH regulations must verify that the TDK substitute meets their supply chain compliance requirements.

Q: What packaging format is the NLV25T-120J-EF supplied in?

A: The NLV25T-120J-EF is supplied in Tape & Reel (TR) format, which is standard for automated PCB assembly processes. This format is compatible with standard pick-and-place equipment and reel handling systems.