1008HC-332EJFS Equivalent & Substitute Parts

Part Overview

The 1008HC-332EJFS is a 3.3 µH unshielded drum core wirewound inductor manufactured by Delta Electronics/Components, rated for 450 mA continuous current with 750mOhm DC resistance. This surface mount component is housed in a 1008 (2520 Metric) package and operates across the temperature range of -40°C to 85°C.

This part is classified as obsolete. Identifying equivalent and substitute components 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	3.3	µH
Current Rating	450	mA
DC Resistance (DCR)	750	mOhm
Tolerance	±5%	-
Core Type	Ferrite Drum Core	-
Shielding	Unshielded	-
Package	1008 (2520 Metric)	-
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the 1008HC-332EJFS are selected based on strict electrical and mechanical compatibility criteria. The following parameters must align for functional substitution:

Critical Matching Parameters:

Inductance value: 3.3 µH (±5% tolerance)
Package type: 1008 (2520 Metric) surface mount
Core material: Ferrite drum core, unshielded configuration
Test frequency: 7.96 MHz

Application-Dependent Parameters:

Current rating must meet or exceed the design requirement (450 mA minimum)
DC resistance affects power dissipation and must be evaluated within circuit context
Operating temperature range must encompass the application environment
Compliance certifications (RoHS3, REACH) must satisfy regulatory requirements

The substitute parts identified below maintain the core inductance specification and package footprint while offering variations in current handling capability and DC resistance characteristics.

Parameter Comparison

Parameter	1008HC-332EJFS (Delta)	744758333A (Würth Elektronik)	NLV25T-3R3J-EF (TDK)
Manufacturer	Delta Electronics/Components	Würth Elektronik	TDK Corporation
Product Status	Obsolete	Active	Active
Inductance	3.3 µH	3.3 µH	3.3 µH
Tolerance	±5%	±5%	±5%
Current Rating	450 mA	460 mA	185 mA
DC Resistance (DCR)	750 mOhm	1.35 Ohm Max	1.9 Ohm Max
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core
Shielding	Unshielded	Unshielded	Unshielded
Q @ 7.96 MHz	22	20	30
Self Resonant Frequency	55 MHz	120 MHz	55 MHz
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 105°C
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

744758333A (Würth Elektronik WE-RFH Series)

This part is the primary direct substitute for the 1008HC-332EJFS. The Würth Elektronik 744758333A maintains identical inductance (3.3 µH), tolerance (±5%), package footprint (1008/2520 Metric), and operating temperature range (-40 to 85°C). Current rating of 460 mA exceeds the original specification of 450 mA, providing equivalent or superior performance in current-limited applications. The part is currently in active production status with 2186 units in stock inventory. RoHS3 compliance and REACH unaffected status align with the original part's regulatory standing. The increased DC resistance (1.35 Ohm Max versus 750 mOhm) requires circuit-level evaluation for power dissipation impact.

NLV25T-3R3J-EF (TDK NLV-EF Series)

The TDK NLV25T-3R3J-EF maintains the 3.3 µH inductance specification and 1008 (2520 Metric) package format. This part is currently in active production with 1931 units in stock. The component offers an extended operating temperature range (-40 to 105°C), providing thermal margin beyond the original specification. However, the current rating of 185 mA is significantly lower than the original 450 mA specification, restricting this part to applications with reduced current requirements. DC resistance of 1.9 Ohm Max is higher than both the original part and the Würth alternative. REACH affected status differs from the original part's REACH unaffected classification and requires compliance verification for specific applications.

Frequently Asked Questions (FAQ)

Q: Can the 744758333A directly replace the 1008HC-332EJFS in all applications?

A: The 744758333A is mechanically and electrically compatible for applications where the current requirement does not exceed 460 mA and the increased DC resistance (1.35 Ohm Max versus 750 mOhm) is acceptable. Circuit-level thermal analysis is required to confirm that the higher resistive losses do not exceed design limits.

Q: Why is the NLV25T-3R3J-EF listed as a substitute if its current rating is only 185 mA?

A: The NLV25T-3R3J-EF is included as a similar part option for applications where the design current requirement is 185 mA or lower. This part shares the identical inductance value, package format, and core type. Applications requiring the full 450 mA rating must use the 744758333A or equivalent higher-current alternatives.

Q: What is the impact of increased DC resistance on circuit performance?

A: DC resistance directly affects power dissipation in the inductor. The 744758333A exhibits 1.35 Ohm Max resistance compared to the original 750 mOhm, resulting in increased I²R losses. For a 450 mA current, the original part dissipates approximately 152 mW, while the substitute dissipates approximately 273 mW. Thermal management and circuit efficiency must be re-evaluated for the specific application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts (744758333A and NLV25T-3R3J-EF) are RoHS3 compliant, matching the original part's regulatory status.

Q: What is the difference between REACH Unaffected and REACH Affected status?

A: REACH Unaffected indicates the part does not contain substances of very high concern (SVHC) listed under REACH regulations. REACH Affected indicates the part may contain SVHC substances and requires specific documentation and compliance measures. The original 1008HC-332EJFS and 744758333A are REACH Unaffected, while the NLV25T-3R3J-EF is REACH Affected.

Q: Do all substitute parts use the same 1008 (2520 Metric) package footprint?

A: All identified parts use the 1008 (2520 Metric) package designation. However, physical dimensions vary slightly. The 1008HC-332EJFS measures 0.115" L x 0.110" W x 0.083" H (max). The 744758333A measures 0.102" L x 0.083" W x 0.075" H (max). The NLV25T-3R3J-EF measures 0.098" L x 0.079" W x 0.075" H (max). PCB layout and component placement clearances must be verified for each substitute.

Q: What is the significance of the Q factor difference between parts?

A: The Q factor at 7.96 MHz indicates the quality factor of the inductor at the test frequency. The original part exhibits Q of 22, the 744758333A exhibits Q of 20, and the NLV25T-3R3J-EF exhibits Q of 30. Higher Q values indicate lower losses at the specified frequency. The NLV25T-3R3J-EF's higher Q may provide performance advantages in RF and high-frequency applications, though its lower current rating limits its applicability.

Q: How do self-resonant frequency differences affect substitution?

A: Self-resonant frequency (SRF) defines the frequency at which the inductor transitions from inductive to capacitive behavior. The original part and NLV25T-3R3J-EF both exhibit 55 MHz SRF, while the 744758333A exhibits 120 MHz SRF. The higher SRF of the 744758333A extends the usable frequency range and may provide advantages in broadband applications. Applications operating near or above the SRF require careful evaluation.

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