1008HC-472EKFS Surface Mount Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The 1008HC-472EKFS is a 4.7 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, designed for surface mount applications in the 1008 (2520 Metric) package. This component is classified as obsolete product status, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The inductor operates across -40°C to 85°C with a 400 mA current rating and 900mOhm DC resistance, serving applications requiring compact ferrite-core inductance in RF and power filtering circuits.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Current Rating	400 mA
DC Resistance (DCR)	900mOhm
Tolerance	±10%
Core Material	Ferrite
Shielding	Unshielded
Package / Case	1008 (2520 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
Inductance Test Frequency	7.96 MHz
Self Resonant Frequency	45 MHz
Q @ 7.96MHz	22
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 1008HC-472EKFS is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 4.7 µH (exact match required)
Package / Case: 1008 (2520 Metric) (exact match required)
Core type: Ferrite, unshielded drum core (exact match required)
Mounting type: Surface Mount (exact match required)
Inductance test frequency: 7.96 MHz (exact match required)

Secondary Compatibility Parameters:

Current rating: 400 mA minimum (substitute must meet or exceed)
DC resistance: Lower values preferred for efficiency
Tolerance: ±5% or ±10% acceptable
Operating temperature range: -40°C to 85°C minimum (extended ranges acceptable)
RoHS3 compliance required

The substitute parts identified below satisfy all primary matching criteria. Variations in DC resistance, Q factor, and self-resonant frequency reflect manufacturing differences between suppliers while maintaining functional equivalence for the specified inductance and current parameters.

Parameter Comparison

Parameter	1008HC-472EKFS (Delta)	744758347A (Würth)	NLV25T-4R7J-EF (TDK)	NLV25T-4R7J-EFD (TDK)
Inductance	4.7 µH	4.7 µH	4.7 µH	4.7 µH
Tolerance	±10%	±5%	±5%	±5%
Current Rating (Amps)	400 mA	400 mA	175 mA	175 mA
DC Resistance (DCR)	900mOhm	1.65Ohm Max	2.3Ohm Max	2.3Ohm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Package / Case	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°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Inductance Test Frequency	7.96 MHz	7.96 MHz	7.96 MHz	7.96 MHz
Self Resonant Frequency	45 MHz	60 MHz	43 MHz	43 MHz
Q @ 7.96MHz	22	20	30	30
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Direct Equivalent - Würth Elektronik 744758347A:

The 744758347A represents the closest direct equivalent to the 1008HC-472EKFS. This part maintains identical current rating (400 mA), matching package dimensions, and equivalent operating temperature range. The Würth part features improved tolerance (±5% versus ±10%) and lower DC resistance (1.65Ohm Max versus 900mOhm), providing superior performance characteristics. Product status is active with 1516 units in stock. This part is recommended as the primary replacement for applications requiring full current capacity and minimal performance degradation.

Alternative Substitute - TDK NLV25T-4R7J-EF and NLV25T-4R7J-EFD:

The TDK NLV-EF and NLV-EFD series parts provide functional substitution with the following considerations: current rating is reduced to 175 mA (56% of original specification), requiring circuit design verification for applications operating near the 400 mA threshold. Both parts offer extended operating temperature range (-40°C to 105°C), improved Q factor (30 versus 22), and tighter tolerance (±5%). The NLV25T-4R7J-EFD variant includes AEC-Q200 automotive qualification and is available in higher inventory (6237 units). These parts are suitable for applications with current requirements below 175 mA or where extended temperature performance and automotive compliance are required.

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity). The TDK parts are REACH Affected, while the Würth part is REACH Unaffected. Selection should account for supply chain compliance requirements specific to end-use application and geographic market.

Frequently Asked Questions (FAQ)

Q: Can the Würth 744758347A directly replace the Delta 1008HC-472EKFS without circuit modification?

A: Yes. The 744758347A maintains identical inductance (4.7 µH), current rating (400 mA), package (1008), and operating temperature range (-40°C to 85°C). The improved tolerance (±5%) and lower DC resistance (1.65Ohm Max) represent performance enhancements. No circuit modification is required.

Q: Why do the TDK NLV25T-4R7J-EF and NLV25T-4R7J-EFD parts have lower current ratings (175 mA)?

A: The TDK parts are from a different product series with different core and winding designs optimized for lower current applications. While inductance and package are identical, the current rating is a fundamental design parameter. These parts are suitable only for circuits operating below 175 mA.

Q: Are the physical dimensions compatible across all substitute parts?

A: All parts use the 1008 (2520 Metric) package. Specific seated heights vary slightly: Delta 2.10mm, Würth 1.90mm, TDK 1.90mm. These variations are within standard PCB assembly tolerances and do not affect placement or reflow compatibility.

Q: What is the difference between NLV25T-4R7J-EF and NLV25T-4R7J-EFD?

A: Both parts are electrically identical with matching inductance, current rating, DC resistance, and operating temperature. The primary difference is AEC-Q200 automotive qualification on the EFD variant. Selection depends on automotive compliance requirements for the end application.

Q: Can I use the Würth 744758347A in applications originally designed for 400 mA operation?

A: Yes. The Würth part maintains the 400 mA current rating and is fully compatible with the original design specification. The lower DC resistance provides improved efficiency.

Q: What is the impact of different Q factors (22 for Delta, 20 for Würth, 30 for TDK) on circuit performance?

A: Q factor indicates inductor efficiency at the test frequency (7.96 MHz). Higher Q values represent lower losses. The Würth part (Q=20) is slightly lower than the original (Q=22), while TDK parts (Q=30) are superior. For most applications, these differences are negligible. Critical RF circuits should evaluate specific frequency response requirements.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. The Würth 744758347A and both TDK parts are supplied in Tape & Reel (TR) packaging, standard for surface mount production assembly.

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