74459222 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74459222 is a 220 µH shielded drum core wirewound inductor rated for 1.2 A continuous current with a maximum DC resistance of 470 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 125°C and is part of the WE-PD3 series. The part is currently active in production and widely available. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

74459222

Würth ElektronikIn Stock: 323274459222 Datasheet

Current PartRFQ

SRR1806-221M

Bourns Inc.In Stock: 1728SRR1806-221M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74459222 is determined by the following critical parameters:

• Inductance value: 220 µH (±20% tolerance band)
• Current rating: minimum 1.2 A continuous
• Saturation current: minimum 1.9 A
• DC resistance: maximum 470 mOhm
• Shielding: shielded construction required
• Operating temperature: -40°C to 125°C minimum
• Mounting: surface mount configuration
• Compliance: ROHS3 and REACH requirements

The Bourns SRR1806-221M meets all substitution criteria within these electrical and mechanical boundaries.

Parameter Comparison

Engineering Selection Recommendations

The Bourns SRR1806-221M qualifies as a direct substitute for the Würth Elektronik 74459222 based on matching inductance, tolerance, saturation current, shielding, temperature range, and regulatory compliance. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental standards.

The primary design consideration is the current rating differential: the Würth part is rated for 1.2 A while the Bourns part is rated for 1.0 A. Applications operating at or above 1.0 A continuous current must account for this reduced headroom. The DC resistance of the Bourns part (510 mOhm) is 40 mOhm higher than the Würth specification (470 mOhm maximum), which may introduce marginally higher power dissipation in high-current applications.

Both parts maintain identical saturation current (1.9 A), operating temperature range, and self-resonant frequency characteristics suitable for 100 kHz inductance testing and general RF filtering applications.

Frequently Asked Questions (FAQ)

Q: Can the Bourns SRR1806-221M replace the Würth 74459222 in all applications?

A: The Bourns part meets all critical electrical parameters including inductance, tolerance, saturation current, and shielding. However, applications requiring the full 1.2 A continuous current rating should evaluate whether the Bourns 1.0 A rating provides sufficient margin for the specific circuit design.

Q: What is the impact of the 40 mOhm DC resistance difference?

A: The Bourns part has a maximum DC resistance of 510 mOhm compared to the Würth part's 470 mOhm maximum. In applications with significant DC current flow, this difference results in approximately 8.5% higher resistive losses. For low-current or AC-dominant applications, this difference is negligible.

Q: Are the physical dimensions compatible?

A: Both parts use nonstandard surface mount packages with similar footprints. The Würth part measures 18.54 mm × 15.24 mm × 7.62 mm (height), while the Bourns part measures 18.30 mm × 14.00 mm × 7.10 mm (height). PCB layout compatibility should be verified for the specific application.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the Würth 74459222 and Bourns SRR1806-221M are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.

Q: What is the frequency performance of these inductors?

A: Both parts have a self-resonant frequency of approximately 4.6–3.7 MHz, making them suitable for filtering and energy storage applications in the kilohertz to low megahertz frequency range.