1008HS-272EKFS Equivalent & Substitute Parts Reference

Part Overview

The 1008HS-272EKFS is a 2.7 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 350 mA with a DC resistance of 1.05 Ohm and is rated for -40°C to 85°C operating temperatures.

The 1008HS-272EKFS has reached 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	2.7	µH
Inductance Tolerance	±10%	-
Current Rating	350	mA
DC Resistance (DCR)	1.05	Ohm
Core Type	Ferrite Drum Core	-
Shielding	Unshielded	-
Package / Case	1008 (2520 Metric)	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-40°C to 85°C	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the 1008HS-272EKFS is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 2.7 µH (exact match required)
Package / Case: 1008 (2520 Metric) (exact match required)
Core type: Ferrite drum core, wirewound (exact match required)
Shielding: Unshielded (exact match required)
Mounting type: Surface mount (exact match required)

Secondary Compatibility Criteria:

Current rating: Must equal or exceed 350 mA
DC resistance: Acceptable within application-specific tolerances
Operating temperature range: Must cover or exceed -40°C to 85°C
Regulatory compliance: ROHS3 compliance required

The substitute parts are grouped into two categories:

Direct Substitutes (Higher Current Rating): Parts that exceed the original current rating while maintaining all primary matching criteria. These parts provide enhanced performance headroom.

Similar Substitutes (Lower Current Rating): Parts that match all primary criteria but operate at reduced current ratings. These are suitable only for applications where the lower current rating does not constrain circuit operation.

Parameter Comparison

Parameter	1008HS-272EKFS (Delta)	744758327A (Würth)	AISC-1008F-2R7J-T (Abracon)	NLV25T-2R7J-EF (TDK)	NLV25T-2R7J-EFD (TDK)
Manufacturer	Delta Electronics	Würth Elektronik	Abracon LLC	TDK Corporation	TDK Corporation
Inductance	2.7 µH	2.7 µH	2.7 µH	2.7 µH	2.7 µH
Inductance Tolerance	±10%	±5%	±5%	±5%	±5%
Current Rating	350 mA	520 mA	490 mA	195 mA	195 mA
DC Resistance	1.05 Ohm	1.1 Ohm Max	1.3 Ohm Max	1.7 Ohm Max	1.7 Ohm Max
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 105°C	-40°C to 105°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Substitution (Preferred):

The 744758327A (Würth Elektronik WE-RFH series) and AISC-1008F-2R7J-T (Abracon AISC-1008F series) are recommended as primary substitutes. Both parts are in active production status, exceed the original 350 mA current rating (520 mA and 490 mA respectively), and maintain ROHS3 compliance. The 744758327A offers the highest current margin at 520 mA with tighter inductance tolerance (±5%), while the AISC-1008F-2R7J-T provides comparable performance with identical package dimensions to the original part.

For Current-Limited Applications:

The NLV25T-2R7J-EF and NLV25T-2R7J-EFD (TDK Corporation NLV-EF and NLV-EFD series) are suitable only for applications where circuit current requirements do not exceed 195 mA. Both parts are in active production and offer extended operating temperature range (-40°C to 105°C). The NLV25T-2R7J-EFD variant includes AEC-Q200 automotive qualification, making it appropriate for automotive applications requiring this certification.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance. The NLV25T-2R7J-EF and NLV25T-2R7J-EFD are REACH Affected, while 744758327A and AISC-1008F-2R7J-T are REACH Unaffected. Selection should account for end-application regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-2R7J-EF or NLV25T-2R7J-EFD be used as direct replacements for the 1008HS-272EKFS?

A: These TDK parts match the inductance value, package, and core type but have a maximum current rating of 195 mA, compared to the original 350 mA rating. They are suitable only if circuit current requirements do not exceed 195 mA. If the application requires the full 350 mA capability, the 744758327A or AISC-1008F-2R7J-T are appropriate choices.

Q: What is the difference between NLV25T-2R7J-EF and NLV25T-2R7J-EFD?

A: Both parts are electrically and mechanically identical with matching inductance, current rating, and DC resistance specifications. The primary difference is that NLV25T-2R7J-EFD includes AEC-Q200 automotive qualification rating, making it suitable for automotive applications requiring this certification. The NLV25T-2R7J-EF does not carry this rating.

Q: Are there physical dimension differences between the substitute parts?

A: Yes. The 744758327A (Würth) has dimensions of 0.102" L x 0.083" W with 0.075" maximum height. The AISC-1008F-2R7J-T (Abracon) has dimensions of 0.115" L x 0.110" W with 0.090" maximum height, matching the original 1008HS-272EKFS footprint. The TDK NLV25T series has dimensions of 0.098" L x 0.079" W with 0.075" maximum height. Verify PCB layout compatibility before selection.

Q: What does the ±10% tolerance on the original part mean compared to ±5% on substitutes?

A: The 1008HS-272EKFS has a wider inductance tolerance band (±10%), meaning the actual inductance value can vary from 2.43 µH to 2.97 µH. Substitute parts with ±5% tolerance have a narrower band (2.565 µH to 2.835 µH), providing tighter inductance control. This tighter tolerance on substitutes is generally beneficial for circuit performance.

Q: Is the higher DC resistance on substitute parts a concern?

A: The original part has 1.05 Ohm DCR. Substitutes range from 1.1 Ohm (Würth) to 1.7 Ohm (TDK). Higher DCR increases power dissipation and heat generation. Verify that the application's thermal design and current levels accommodate the selected substitute's DCR specification.

Q: Can I use the 744758327A in place of the AISC-1008F-2R7J-T?

A: Both parts meet the primary substitution criteria and are in active production. The 744758327A offers higher current rating (520 mA vs. 490 mA) and lower DCR (1.1 Ohm vs. 1.3 Ohm), making it technically superior. However, the AISC-1008F-2R7J-T matches the original part's physical dimensions more closely. Selection depends on PCB layout constraints and thermal requirements.

Q: What is the significance of the self-resonant frequency (SRF) values?

A: The original part has SRF of 70 MHz, while substitutes range from 70 MHz (TDK) to 135 MHz (Würth). SRF indicates the frequency above which the inductor behaves capacitively rather than inductively. Higher SRF values provide wider usable frequency range. Verify that the application's operating frequency is below the selected part's SRF.

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