Würth Elektronik 74458003 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74458003 is a 3.3 µH unshielded drum core wirewound inductor rated for 6.2 A continuous current with a maximum DC resistance of 18mOhm. This component is designed for surface mount applications in the nonstandard package category and maintains active product status with full RoHS3 compliance. Equivalent and substitute parts are identified when electrical parameters and mechanical dimensions align within acceptable tolerances for the intended application circuit.

Key Parameters

Parameter	Value
Inductance	3.3 µH
Current Rating	6.2 A
DC Resistance (DCR)	18mOhm Max
Inductance Tolerance	±20%
Core Type	Ferrite Drum Core
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 74458003 is determined by the following critical parameters: inductance value of 3.3 µH, current rating capability, DC resistance characteristics, core material composition, shielding configuration, and surface mount package compatibility. The identified substitute parts maintain the same inductance specification and unshielded configuration while operating within compatible current and temperature ranges. Tolerance variations and dimensional differences within the nonstandard package category do not preclude functional equivalence when electrical performance requirements are satisfied.

Parameter Comparison

Parameter	74458003 (Würth Elektronik)	P0250.332NL (Pulse Electronics)	SDR1806-3R3ML (Bourns Inc.)
Inductance	3.3 µH	3.3 µH	3.3 µH
Inductance Tolerance	±20%	±15%	±20%
Current Rating (Amps)	6.2 A	6.2 A	7.6 A
Current - Saturation (Isat)	15.8 A	14 A	17 A
DC Resistance (DCR)	18mOhm Max	15mOhm Max	9.8mOhm Max
Core Type	Ferrite Drum Core	Wirewound	Ferrite Drum Core
Shielding	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C ~ 125°C	-40°C ~ 130°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Frequency - Self Resonant	34 MHz	Not specified	40 MHz
Size / Dimension (L x W)	0.730" x 0.600" (18.54mm x 15.24mm)	0.733" x 0.596" (18.62mm x 15.14mm)	0.720" x 0.551" (18.30mm x 14.00mm)
Height - Seated (Max)	0.280" (7.11mm)	0.290" (7.36mm)	0.272" (6.90mm)

Engineering Selection Recommendations

All three components—74458003, P0250.332NL, and SDR1806-3R3ML—maintain active product status and full ROHS3 compliance with REACH unaffected designation. The 74458003 and SDR1806-3R3ML share identical ferrite drum core construction, while P0250.332NL employs wirewound construction without specified core material. Selection between these parts depends on circuit requirements for DC resistance, current saturation characteristics, and dimensional constraints. The SDR1806-3R3ML provides superior DC resistance performance at 9.8mOhm maximum and higher saturation current at 7.6 A. The P0250.332NL offers tighter inductance tolerance at ±15% and extended operating temperature to 130°C. Dimensional variations across all three parts remain within the nonstandard package category and require verification against specific PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can P0250.332NL replace 74458003 in all applications? A: P0250.332NL maintains the same 3.3 µH inductance and 6.2 A current rating as the 74458003. The primary differences are tighter inductance tolerance (±15% versus ±20%), lower DC resistance (15mOhm versus 18mOhm maximum), and extended operating temperature range to 130°C. Substitution is valid when these parameter variations are acceptable to the circuit design.

Q: What are the advantages of SDR1806-3R3ML over the main part? A: The SDR1806-3R3ML provides lower DC resistance at 9.8mOhm maximum compared to 74458003 at 18mOhm maximum, resulting in reduced power dissipation. It also offers higher saturation current at 17 A versus 15.8 A. These characteristics make it suitable for applications requiring improved thermal performance and higher current headroom.

Q: Are dimensional differences significant for PCB layout? A: All three parts are classified as nonstandard package inductors with similar footprints. The 74458003 measures 0.730" x 0.600" with 0.280" height, P0250.332NL measures 0.733" x 0.596" with 0.290" height, and SDR1806-3R3ML measures 0.720" x 0.551" with 0.272" height. Dimensional verification against specific PCB pad layouts is required before final component selection.

Q: Do all substitute parts meet the same compliance standards? A: All three components are ROHS3 compliant with REACH unaffected status and EAR99 export classification. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the significance of inductance tolerance differences? A: The 74458003 and SDR1806-3R3ML specify ±20% tolerance, while P0250.332NL specifies ±15% tolerance. Tighter tolerance in P0250.332NL provides more predictable inductance values across production batches, which may be critical for applications with narrow frequency response windows or precision filtering requirements.

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