1008HS-182EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HS-182EKFS is a 1.8 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 500 mA continuous current with 800mOhm DC resistance. This surface mount component in 1008 (2520 Metric) package is designed for RF and general-purpose filtering applications at 7.96 MHz test frequency.

The 1008HS-182EKFS carries obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Key Parameters

Parameter	Value	Unit
Inductance	1.8	µH
Current Rating	500	mA
DC Resistance (DCR)	800	mOhm
Tolerance	±10%	-
Core Type	Ferrite Drum Core	-
Shielding	Unshielded	-
Package	1008 (2520 Metric)	-
Mounting Type	Surface Mount	-
Operating Temperature	-40°C to 85°C	-
Test Frequency	7.96	MHz

Substitute Part Grouping Explanation

Substitution eligibility for the 1008HS-182EKFS is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 1.8 µH (exact match required)
Package type: 1008 (2520 Metric) surface mount (exact match required)
Core material: Ferrite drum core, unshielded (exact match required)
Test frequency: 7.96 MHz (exact match required)

Secondary Compatibility Parameters:

Current rating: Substitute must equal or exceed 500 mA
DC resistance: Substitute must not exceed 800mOhm nominal specification
Operating temperature range: Substitute must cover -40°C to 85°C minimum
Tolerance: ±10% or better acceptable
RoHS3 compliance: Required for environmental standards alignment

The substitute parts listed below satisfy the primary matching criteria. Secondary parameters indicate performance characteristics that determine application suitability within the specified operating envelope.

Parameter Comparison

Parameter	1008HS-182EKFS (Main)	744758318A (Würth)	NLV25T-1R8J-EF (TDK)	NLV25T-1R8J-EFD (TDK)
Manufacturer	Delta Electronics	Würth Elektronik	TDK Corporation	TDK Corporation
Inductance	1.8 µH	1.8 µH	1.8 µH	1.8 µH
Tolerance	±10%	±5%	±5%	±5%
Current Rating	500 mA	630 mA	210 mA	210 mA
DC Resistance	800 mOhm	750 mOhm Max	1.45 Ohm Max	1.45 Ohm Max
Q @ 7.96 MHz	25	20	30	30
Self Resonant Frequency	135 MHz	200 MHz	135 MHz	135 MHz
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 105°C	-40°C to 105°C
Package	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Product Status	Obsolete	Active	Active	Active
RoHS3 Compliance	Compliant	Compliant	Compliant	Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
AEC-Q200 Rating	Not specified	Not specified	Not specified	Yes

Engineering Selection Recommendations

744758318A (Würth Elektronik WE-RFH Series)

This part is a direct substitute for applications where current rating and DC resistance performance are primary design constraints. The 744758318A provides 630 mA current rating, exceeding the 500 mA requirement of the 1008HS-182EKFS. DC resistance of 750mOhm maximum is lower than the original 800mOhm specification, resulting in reduced power dissipation. Tighter tolerance (±5%) improves inductance accuracy. Active product status ensures long-term availability. Suitable for general RF filtering and impedance matching applications within the -40°C to 85°C operating range.

NLV25T-1R8J-EF (TDK NLV-EF Series)

This part is suitable for applications where extended operating temperature range and higher Q factor are beneficial. The NLV25T-1R8J-EF operates to 105°C, providing thermal margin beyond the original specification. Q factor of 30 at 7.96 MHz exceeds the original 25, indicating improved efficiency at the test frequency. Current rating of 210 mA is below the original 500 mA specification; this part is applicable only to circuits with lower current requirements. DC resistance of 1.45 Ohm maximum is significantly higher than the original specification and must be evaluated for thermal and impedance matching impact. Active product status and REACH compliance support supply continuity.

NLV25T-1R8J-EFD (TDK NLV-EFD Series)

This part is functionally equivalent to NLV25T-1R8J-EF with the addition of AEC-Q200 automotive qualification. Identical electrical specifications apply: 210 mA current rating, 1.45 Ohm maximum DC resistance, 30 Q factor at 7.96 MHz, and -40°C to 105°C operating temperature. AEC-Q200 certification qualifies this part for automotive and high-reliability applications. Selection of this variant is appropriate when automotive-grade component qualification is a design or procurement requirement.

Current Rating Constraint Analysis

The 744758318A (630 mA) is the only substitute that meets or exceeds the original 500 mA current rating. The TDK variants (NLV25T-1R8J-EF and NLV25T-1R8J-EFD) are rated for 210 mA maximum and are not suitable for circuits designed for 500 mA operation. Selection must be based on actual circuit current requirements.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-1R8J-EF or NLV25T-1R8J-EFD be used as direct replacements for 1008HS-182EKFS?

A: No. While these TDK parts match the inductance value, package, and core type, the 210 mA current rating is significantly below the original 500 mA specification. These parts are suitable only for circuits with maximum current requirements of 210 mA or less. The 744758318A is the appropriate direct substitute for full current rating compatibility.

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

A: The TDK NLV25T-1R8J-EF and NLV25T-1R8J-EFD parts have 1.45 Ohm maximum DC resistance compared to 800mOhm in the original part. At 210 mA, this results in approximately 305 mW power dissipation in the inductor, compared to 84 mW in the original at 500 mA. Higher DC resistance increases thermal generation and may require thermal management evaluation in the circuit design.

Q: Is the 744758318A suitable for all applications using 1008HS-182EKFS?

A: The 744758318A is suitable for applications where the operating temperature range of -40°C to 85°C is acceptable and current requirements do not exceed 630 mA. The lower DC resistance (750mOhm maximum) and higher current rating make this part compatible with the original design envelope. Verify that the tighter tolerance (±5% versus ±10%) does not introduce unintended circuit behavior in frequency-dependent applications.

Q: What is the difference between NLV25T-1R8J-EF and NLV25T-1R8J-EFD?

A: Both parts have identical electrical specifications. The NLV25T-1R8J-EFD includes AEC-Q200 automotive qualification, making it suitable for automotive and high-reliability applications where component qualification standards are mandatory. Select the EFD variant when automotive-grade certification is required by design or procurement specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 1008HS-182EKFS, 744758318A, NLV25T-1R8J-EF, and NLV25T-1R8J-EFD are all RoHS3 compliant. All parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q: How does the self-resonant frequency affect substitution?

A: The 744758318A has a self-resonant frequency of 200 MHz, compared to 135 MHz in the original and TDK variants. Higher self-resonant frequency extends the usable frequency range before the inductor transitions to capacitive behavior. This characteristic is beneficial for broadband RF applications but does not affect substitution eligibility for circuits operating at or below 7.96 MHz test frequency.

Q: What inventory considerations apply to these substitutes?

A: The 1008HS-182EKFS (obsolete) has 716 pieces in stock. The 744758318A has 2300 pieces available. Both TDK variants have active status with 2235 pieces (NLV25T-1R8J-EF) and 1208 pieces (NLV25T-1R8J-EFD) in inventory. Active product status for the substitute parts ensures ongoing availability for future production requirements.

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