Würth Elektronik 744066331 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744066331 is a 330 µH shielded drum core wirewound inductor rated for 600 mA continuous current with 1 Ohm maximum DC resistance. This surface mount component is designed for applications requiring stable inductance performance across the -40°C to 125°C operating temperature range. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements permit tolerance in current rating, DC resistance, or self-resonant frequency while maintaining the core 330 µH inductance specification and shielded surface mount package form factor.

Substiute Parts

744066331

Würth ElektronikIn Stock: 2456744066331 Datasheet

Current PartRFQ

SRU1038-331Y

Bourns Inc.In Stock: 1867SRU1038-331Y Datasheet

DirectRFQ

PF0560.334NLT

Pulse ElectronicsIn Stock: 3111PF0560.334NLT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 744066331 is determined by the following criteria:

Primary Matching Parameters:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±30% or tighter
• Shielding: Shielded configuration
• Mounting: Surface mount
• Package footprint: 10.00mm x 10.00mm nominal dimensions
• Operating temperature range: -40°C to 125°C minimum

Allowable Variation Parameters:

• Current rating: 550 mA or higher acceptable for applications not requiring full 600 mA capability
• DC resistance: Up to 1.09 Ohm acceptable for applications with relaxed resistance requirements
• Self-resonant frequency: 3 MHz to 6 MHz range acceptable depending on circuit operating frequency
• Saturation current: 520 mA or higher acceptable for non-critical saturation margin applications

Non-Negotiable Requirements:

• ROHS3 compliance mandatory
• MSL 1 rating required
• Nonstandard package form factor maintained

Parameter Comparison

Engineering Selection Recommendations

SRU1038-331Y (Bourns Inc.) is suitable as a direct substitute when the application current requirement does not exceed 550 mA. This part offers superior DC resistance at 773 mOhm compared to the 744066331, reducing power dissipation in current-limited designs. The ±30% inductance tolerance matches the primary part. Identical package dimensions and operating temperature range ensure mechanical and thermal compatibility. ROHS3 compliance and MSL 1 rating maintain regulatory and environmental requirements.

PF0560.334NLT (Pulse Electronics) is suitable when the application current requirement does not exceed 520 mA and can accommodate slightly higher DC resistance at 1.09 Ohm. This part provides tighter inductance tolerance at ±25%, beneficial for precision applications. Saturation current matches the primary part at 700 mA. Package dimensions vary slightly (10.40mm x 10.30mm x 4.00mm) and must be verified for PCB layout compatibility. ROHS3 compliance and MSL 1 rating are maintained.

Both substitutes maintain active product status and full regulatory compliance. Selection depends on specific current and resistance requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can SRU1038-331Y replace 744066331 in all applications?

A: SRU1038-331Y is compatible when the application current requirement is 550 mA or lower. If the design requires the full 600 mA rating of the 744066331, this substitute is not appropriate. The superior DC resistance (773 mOhm vs 1 Ohm) is advantageous for power efficiency.

Q: What is the impact of different self-resonant frequencies?

A: The 744066331 operates at 6 MHz self-resonant frequency, while SRU1038-331Y and PF0560.334NLT operate at 3 MHz and 3.2 MHz respectively. Applications operating near or above 3 MHz may experience different impedance characteristics. Circuit simulation or testing is necessary to confirm suitability in high-frequency applications.

Q: Are the package dimensions interchangeable?

A: The 744066331 and SRU1038-331Y share identical dimensions (10.00mm x 10.00mm x 4.10mm). The PF0560.334NLT has slightly different dimensions (10.40mm x 10.30mm x 4.00mm) and PCB layout must be verified for compatibility.

Q: What does the ±30% and ±25% inductance tolerance mean for substitution?

A: Inductance tolerance defines the acceptable range of actual inductance values from the nominal 330 µH specification. Both the primary part and substitutes fall within acceptable tolerance bands. The PF0560.334NLT offers tighter tolerance (±25%), which may be beneficial for precision-critical applications.

Q: Are all parts ROHS3 compliant?

A: Yes. The 744066331, SRU1038-331Y, and PF0560.334NLT are all ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, meeting current regulatory requirements for electronic component manufacturing and assembly.

Q: What is the difference between current rating and saturation current?

A: Current rating (600 mA, 550 mA, 520 mA) is the continuous operating current limit. Saturation current (Isat) is the current level at which the inductor's inductance begins to degrade significantly. The 744066331 and PF0560.334NLT both have 700 mA saturation current, while SRU1038-331Y has 520 mA saturation current.