Würth Elektronik 74479053 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74479053 is a 3.3 µH unshielded multilayer inductor designed for surface mount applications in the 0805 (2012 Metric) package. This component operates across an industrial temperature range of -55°C to 125°C with a maximum DC resistance of 800 mOhm and supports a current rating of 440 mA. The part is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute components are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or specific application requirements.

Key Parameters

Parameter	Value	Unit
Inductance	3.3	µH
Inductance Tolerance	±10%	%
Current Rating	440	mA
DC Resistance (Max)	800	mOhm
Q Factor @ 10 MHz	45	—
Self Resonant Frequency	45	MHz
Operating Temperature Range	-55 to 125	°C
Package Type	0805 (2012 Metric)	—
Mounting Type	Surface Mount	—
Shielding	Unshielded	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 74479053 is determined by the following critical parameters:

Electrical Equivalence Requirements:

Inductance value: 3.3 µH (±10% tolerance acceptable)
DC resistance: 800 mOhm maximum
Q factor @ 10 MHz: 45 minimum
Operating temperature range: -55°C to 125°C minimum coverage
Package classification: 0805 (2012 Metric) surface mount

Mechanical Compatibility:

Package footprint: 0805 (2012 Metric) standard
Mounting type: Surface mount
Height constraints: Physical dimensions must accommodate board layout

Compliance & Certification:

RoHS3 compliance required
MSL rating: 1 (Unlimited) acceptable
REACH status: Unaffected acceptable

The Bourns CV201210-3R3K meets all electrical and mechanical substitution criteria. Differences in shielding (shielded vs. unshielded) and current rating do not preclude substitution when the application current requirement does not exceed the substitute part's 30 mA rating.

Parameter Comparison

Parameter	Würth Elektronik 74479053	Bourns CV201210-3R3K	Match Status
Inductance	3.3 µH	3.3 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
DC Resistance (Max)	800 mOhm	800 mOhm	Equivalent
Q Factor @ 10 MHz	45	45	Equivalent
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	Equivalent
Package Type	0805 (2012 Metric)	0805 (2012 Metric)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Current Rating	440 mA	30 mA	Substitute Limited to 30 mA
Shielding	Unshielded	Shielded	Different (Shielded Preferred)
Self Resonant Frequency	45 MHz	41 MHz	Similar
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Height - Seated (Max)	0.043" (1.10 mm)	0.057" (1.45 mm)	Substitute Higher

Engineering Selection Recommendations

Primary Selection (Würth Elektronik 74479053): Select the Würth Elektronik 74479053 for applications requiring the full 440 mA current rating. This component is Active product status with established supply availability (979 Pcs in stock). The unshielded design is suitable for applications where EMI shielding is not a circuit requirement.

Substitute Selection (Bourns CV201210-3R3K): The Bourns CV201210-3R3K is substitutable only for applications where the circuit current requirement does not exceed 30 mA. This component offers superior shielding characteristics (shielded construction) which may provide advantages in noise-sensitive applications. The substitute is Active product status with higher inventory availability (11,864 Pcs in stock). The increased seated height (1.45 mm vs. 1.10 mm) must be verified against board layout constraints.

Both components satisfy RoHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity requirements. Selection between primary and substitute depends on current rating requirements and shielding necessity for the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can the Bourns CV201210-3R3K replace the Würth Elektronik 74479053 in all applications?

A: No. The Bourns substitute is limited to applications where circuit current does not exceed 30 mA. The Würth Elektronik part supports 440 mA. If your application requires current above 30 mA, the Würth Elektronik 74479053 is the only suitable option from this comparison.

Q: What is the significance of shielding differences between these parts?

A: The Würth Elektronik 74479053 is unshielded, while the Bourns CV201210-3R3K is shielded. Shielding reduces electromagnetic interference emission and susceptibility. For applications sensitive to EMI, the shielded Bourns part offers superior performance. For applications without EMI constraints, both designs are functionally equivalent at the specified inductance and resistance values.

Q: Are the physical dimensions compatible for PCB layout?

A: Both components use the 0805 (2012 Metric) package with identical footprint dimensions (0.079" L x 0.049" W / 2.00 mm x 1.25 mm). However, the Bourns substitute has a greater seated height (1.45 mm vs. 1.10 mm). Verify clearance above the component location on your PCB before substitution.

Q: Do both parts meet compliance requirements?

A: Yes. Both the Würth Elektronik 74479053 and Bourns CV201210-3R3K are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are classified as Active product status.

Q: What are the inductance tolerance specifications?

A: Both components specify ±10% inductance tolerance at the 10 MHz test frequency. This tolerance applies equally to both the primary and substitute parts.

Q: How do the Q factors compare?

A: Both components specify a Q factor of 45 at 10 MHz, indicating equivalent quality factor performance at this frequency.

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