Würth Elektronik 7447640033 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7447640033 is a 330 nH unshielded drum core wirewound inductor rated for 450 mA with a maximum DC resistance of 400 mOhm. This surface mount component in 1210 (3225 Metric) package is designed for high-frequency applications with a self-resonant frequency of 580 MHz. The part is active in production and ROHS3 compliant, making it suitable for modern electronic assemblies requiring compact inductance solutions in the sub-microhenry range.

Equivalent parts are necessary when the primary manufacturer part becomes unavailable, when supply chain constraints require alternative sourcing, or when design flexibility permits component substitution within specified electrical and mechanical parameters.

Substiute Parts

7447640033

Würth ElektronikIn Stock: 20457447640033 Datasheet

Current PartRFQ

CMH322522-R33ML

Bourns Inc.In Stock: 3103CMH322522-R33ML Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7447640033 is determined by the following critical parameters:

• Inductance Value: 330 nH (exact match required)
• Current Rating: 450 mA minimum
• DC Resistance: 400 mOhm maximum
• Package / Case: 1210 (3225 Metric) surface mount
• Physical Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm), Height 0.094" max (2.40mm)
• Compliance: ROHS3 compliant, REACH unaffected

The Bourns CMH322522-R33ML meets all critical electrical parameters and physical package requirements. While the substitute features shielding (versus unshielded on the primary part) and has a wider inductance tolerance (±20% versus ±10%), these differences do not preclude substitution in applications where the electrical performance envelope remains acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the Würth Elektronik 7447640033 and Bourns CMH322522-R33ML are active production components with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component manufacturing and use.

The primary electrical parameters—inductance value, current rating, and DC resistance—are identical between the two parts. Both components are rated for the same 450 mA current and feature 400 mOhm maximum DC resistance, ensuring equivalent performance in power delivery and signal conditioning applications.

The Bourns substitute provides an extended operating temperature range (-55°C to 125°C versus -40°C to 105°C), which may be advantageous in applications requiring broader thermal performance. The shielded construction of the Bourns part offers additional electromagnetic isolation compared to the unshielded Würth design, which may be beneficial in noise-sensitive circuits but is not required for direct substitution.

Selection between these parts should be based on application-specific requirements regarding shielding needs, temperature operating range, and inductance tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can the Bourns CMH322522-R33ML directly replace the Würth Elektronik 7447640033 in existing designs?

A: Yes, the Bourns part meets all critical electrical specifications: 330 nH inductance, 450 mA current rating, and 400 mOhm maximum DC resistance. Physical dimensions and package type (1210 / 3225 Metric) are identical, enabling direct PCB footprint compatibility.

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

A: The Würth part is unshielded while the Bourns substitute is shielded. Shielding reduces electromagnetic radiation and susceptibility to external interference. In applications where EMI performance is critical, the shielded Bourns part may provide superior performance. In applications where shielding is not required, both parts function equivalently.

Q: How do the inductance tolerances affect substitution?

A: The Würth part specifies ±10% tolerance while the Bourns part specifies ±20%. Both tolerances encompass the nominal 330 nH value. Applications with tight inductance requirements should account for the wider tolerance of the Bourns part during circuit design and validation.

Q: Are there temperature range considerations for substitution?

A: The Bourns CMH322522-R33ML operates across -55°C to 125°C, exceeding the Würth part's -40°C to 105°C range. For applications operating within the Würth specification range, both parts are equivalent. For applications requiring extended low-temperature operation below -40°C or high-temperature operation above 105°C, the Bourns part provides additional margin.

Q: Do both parts meet current compliance standards?

A: Yes, both the Würth Elektronik 7447640033 and Bourns CMH322522-R33ML are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component use in regulated markets.

Q: What is the difference in self-resonant frequency between these parts?

A: The Würth part specifies 580 MHz self-resonant frequency while the Bourns part specifies 300 MHz. For applications operating significantly below these frequencies, this difference has minimal impact. For high-frequency applications approaching or exceeding 300 MHz, the Würth part's higher self-resonant frequency may provide better performance characteristics.