Würth Elektronik 7447903 Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7447903 is a fixed inductor classified as an unshielded multilayer component. This part is currently listed as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part is ROHS3 compliant and suitable for surface mount applications in the 0805 (2012 Metric) package format.

Substiute Parts

7447903

Würth ElektronikIn Stock: 8077447903 Datasheet

Current PartRFQ

74479023

Würth ElektronikIn Stock: 491474479023 Datasheet

MFR RecommendedRFQ

74479032

Würth ElektronikIn Stock: 407374479032 Datasheet

MFR RecommendedRFQ

CV201210-R33K

Bourns Inc.In Stock: 1018CV201210-R33K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the obsolete Würth Elektronik 7447903 is determined by the following criteria:

Primary Substitution Parameters:

• Package / Case: 0805 (2012 Metric)
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant
• ECCN Classification: EAR99
• HTSUS Code: 8504.50.8000

Secondary Compatibility Factors:

• Inductance value range
• Current rating capability
• DC resistance (DCR) specifications
• Operating temperature range (-55°C ~ 125°C)
• Shielding configuration (unshielded or shielded)

Three active substitute parts are identified: two from Würth Elektronik (74479023 and 74479032) and one from Bourns Inc. (CV201210-R33K). All substitutes maintain the same package format, surface mount configuration, and regulatory compliance status as the original part.

Parameter Comparison

Engineering Selection Recommendations

Würth Elektronik 74479023 (220 nH, 250 mA)

This part is recommended as the primary substitute when the original design requires a 220 nH inductance value. It maintains manufacturer continuity with Würth Elektronik, carries active product status, and provides equivalent current handling (250 mA) with lower DC resistance (500mOhm Max). The unshielded configuration matches the original part's electromagnetic profile. ROHS3 compliance and MSL 1 rating ensure regulatory and moisture handling compatibility.

Würth Elektronik 74479032 (470 nH, 200 mA)

This part serves as a substitute for applications requiring higher inductance (470 nH). It is active and ROHS3 compliant. The current rating is reduced to 200 mA with slightly higher DC resistance (600mOhm Max). Selection of this part requires verification that the design's current requirements do not exceed 200 mA and that the higher inductance value is acceptable for the circuit function.

Bourns Inc. CV201210-R33K (330 nH, 250 mA)

This part provides a mid-range inductance value (330 nH) with equivalent current handling (250 mA) and is suitable for designs where shielding is beneficial or required. The shielded configuration differs from the unshielded original part. DC resistance is 550mOhm Max. This part is active, ROHS3 compliant, and carries MSL 1 rating. Selection requires confirmation that shielding does not negatively impact circuit performance and that the 330 nH value meets design specifications.

All three substitutes are active products with ROHS3 compliance, EAR99 ECCN classification, and identical HTSUS coding, ensuring regulatory and procurement compatibility with the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Why is the original Würth Elektronik 7447903 no longer available?

A: The part is listed as obsolete. Würth Elektronik has transitioned to active product lines, including the WE-MI series (74479023 and 74479032), which offer improved specifications and continued manufacturing support.

Q: Can I use any of these substitutes interchangeably?

A: No. Each substitute has different inductance values (220 nH, 330 nH, and 470 nH) and current ratings (200 mA or 250 mA). Selection must be based on your circuit's specific inductance and current requirements. The original part's specifications are not provided, so the appropriate substitute depends on your design parameters.

Q: What is the difference between shielded and unshielded inductors?

A: Shielded inductors (CV201210-R33K) contain a ferrite shield that reduces electromagnetic radiation and susceptibility to external fields. Unshielded inductors (74479023, 74479032) have no shield. Selection depends on circuit layout and EMI/EMC requirements. If the original design used an unshielded part, the shielded Bourns substitute may alter circuit behavior.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All three substitute parts (74479023, 74479032, and CV201210-R33K) are ROHS3 compliant, matching the original part's regulatory status.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 indicates Moisture Sensitivity Level 1, which means the component has unlimited shelf life and requires no special moisture control during storage or handling. All substitutes carry this rating.

Q: Can I substitute the Bourns CV201210-R33K for a Würth Elektronik part?

A: Yes, provided the inductance value (330 nH) and current rating (250 mA) match your design requirements. The shielded configuration may require circuit validation to ensure no performance degradation. All regulatory and package specifications are compatible.

Q: What is the significance of the 0805 (2012 Metric) package?

A: This is a surface mount package measuring 2.00mm x 1.25mm in length and width. All substitutes use this identical package, ensuring PCB footprint and reflow soldering compatibility with designs originally specified for the 7447903.

Q: Do these parts have the same DC resistance?

A: No. DC resistance varies: 74479023 has 500mOhm Max, 74479032 has 600mOhm Max, and CV201210-R33K has 550mOhm Max. Higher DC resistance increases power dissipation. Select based on your circuit's thermal and efficiency requirements.

Q: What is the operating temperature range for these substitutes?

A: All three substitutes operate from -55°C to 125°C, providing equivalent thermal performance to the original part.