Equivalent & Substitute Parts for 1008HS-104EKFS

Part Overview

The 1008HS-104EKFS is a 100 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 80 mA continuous current with 11 Ohm DC resistance. This component is classified as obsolete, necessitating identification of active equivalent alternatives from current manufacturers. The part is packaged in 1008 (2520 Metric) surface mount format with ferrite core construction and operates across the -40°C to 85°C temperature range.

Key Parameters

Parameter	Value	Unit
Inductance	100	µH
Current Rating	80	mA
DC Resistance (DCR)	11	Ohm
Core Type	Ferrite Drum Core	—
Shielding	Unshielded	—
Package	1008 (2520 Metric)	—
Mounting Type	Surface Mount	—
Operating Temperature	-40 to 85	°C
Tolerance	±10	%

Substitute Part Grouping Explanation

Substitution of the 1008HS-104EKFS requires matching the following critical parameters: inductance value (100 µH), package format (1008/2520 Metric), core material (ferrite), shielding configuration (unshielded), and mounting type (surface mount). Current rating and DC resistance are secondary selection criteria that determine application suitability within the circuit design constraints.

The substitute parts identified fall into two categories:

Category 1: Direct Inductance Match (100 µH)

NLV25T-101J-EF (TDK Corporation)
NLV25T-101J-EFD (TDK Corporation)

These parts maintain the 100 µH inductance specification and are manufactured by TDK Corporation in active production status. Both employ ferrite drum core construction in the 1008 package format.

Category 2: Different Inductance Value (100 nH)

NLV25T-R10J-EF (TDK Corporation)

This part represents a different inductance specification (100 nH versus 100 µH) and is included in the manufacturer's substitute list. Selection of this part requires circuit-level verification of inductance requirements.

Parameter Comparison

Parameter	1008HS-104EKFS (Delta)	NLV25T-101J-EF (TDK)	NLV25T-101J-EFD (TDK)	NLV25T-R10J-EF (TDK)
Inductance	100 µH	100 µH	100 µH	100 nH
Current Rating	80 mA	60 mA	60 mA	280 mA
DC Resistance	11 Ohm	21 Ohm Max	21 Ohm Max	800 mOhm Max
Tolerance	±10%	±5%	±5%	±5%
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Package	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40 to 85°C	-40 to 105°C	-40 to 105°C	-40 to 105°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	—	Cut Tape & Digi-Reel	Tape & Reel	Tape & Reel

Engineering Selection Recommendations

For 100 µH Inductance Applications:

NLV25T-101J-EFD is the preferred substitute for the 1008HS-104EKFS. This part maintains the 100 µH inductance specification, operates across an extended temperature range (-40°C to 105°C), and carries AEC-Q200 automotive qualification. The part is in active production with 2763 pieces in stock. The reduced current rating (60 mA versus 80 mA) and increased DC resistance (21 Ohm Max versus 11 Ohm) require circuit-level verification to confirm compatibility with the original design current and power dissipation requirements.

NLV25T-101J-EF provides an alternative with identical electrical specifications to NLV25T-101J-EFD but is supplied in Cut Tape & Digi-Reel packaging with higher inventory availability (2445 pieces). Selection between these two TDK parts depends on assembly process requirements and packaging preferences.

For Applications Requiring Different Inductance:

NLV25T-R10J-EF represents a fundamentally different inductance value (100 nH) and is not suitable as a direct replacement for 100 µH applications. This part is listed in the manufacturer's substitute documentation but requires independent circuit validation.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and operate within the automotive temperature range. NLV25T-101J-EFD includes AEC-Q200 qualification, suitable for automotive applications. The original 1008HS-104EKFS operates to 85°C maximum; substitute parts extend to 105°C, providing additional thermal margin.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-101J-EF and NLV25T-101J-EFD be used interchangeably?

A: Both parts share identical electrical specifications (100 µH, 60 mA, 21 Ohm Max DCR, ±5% tolerance) and physical dimensions. The primary difference is packaging format: NLV25T-101J-EF is supplied in Cut Tape & Digi-Reel, while NLV25T-101J-EFD is supplied in Tape & Reel. Selection depends on assembly equipment compatibility and procurement requirements. NLV25T-101J-EFD includes AEC-Q200 qualification.

Q: Why is the current rating lower on the TDK substitutes (60 mA) compared to the original part (80 mA)?

A: The NLV25T-101J series is rated for 60 mA continuous current, which is a design characteristic of this inductor family. Applications requiring 80 mA operation must verify that the circuit can function within the 60 mA constraint or select alternative components. The reduced current rating directly impacts maximum allowable circuit current.

Q: What is the significance of the increased DC resistance in the substitute parts?

A: The original 1008HS-104EKFS has 11 Ohm DCR, while NLV25T-101J series parts have 21 Ohm Max DCR. This increased resistance results in higher power dissipation (P = I²R) at equivalent current levels. Circuit designs must account for this additional resistive loss, particularly in low-voltage or high-efficiency applications.

Q: Is NLV25T-R10J-EF a suitable replacement?

A: NLV25T-R10J-EF has a fundamentally different inductance value (100 nH versus 100 µH) and is not a direct replacement. This part is listed in the manufacturer's substitute documentation but represents a different component category. Use of this part requires independent circuit design verification and is not recommended for direct substitution.

Q: What are the physical dimension differences between the original and substitute parts?

A: The 1008HS-104EKFS measures 0.115" L × 0.110" W × 0.083" H (2.92mm × 2.79mm × 2.10mm). The TDK NLV25T series measures 0.098" L × 0.079" W × 0.075" H (2.50mm × 2.00mm × 1.90mm). Both conform to the 1008 (2520 Metric) package specification but have slightly different physical footprints. PCB layout verification is required before implementation.

Q: Are all substitute parts RoHS compliant?

A: Yes. The original 1008HS-104EKFS and all substitute parts (NLV25T-101J-EF, NLV25T-101J-EFD, NLV25T-R10J-EF) are ROHS3 compliant. All parts are suitable for applications requiring RoHS certification.

Q: What is the difference between the operating temperature ranges?

A: The original 1008HS-104EKFS operates from -40°C to 85°C. All TDK substitute parts operate from -40°C to 105°C, providing an additional 20°C upper temperature margin. This extended range is beneficial for applications in elevated ambient conditions or high-power dissipation environments.

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