SDR1045-330M Equivalent & Substitute Parts

Part Overview

The SDR1045-330M is a 33 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.9 A continuous current with a maximum DC resistance of 220 mOhm. This component is designed for surface mount applications in nonstandard package configurations and is currently in active production status. Substitute parts are identified when equivalent inductance values, compatible current ratings, and similar thermal operating ranges are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

SDR1045-330M

Bourns Inc.In Stock: 1073SDR1045-330M Datasheet

Current PartRFQ

PF0581.333NL

Pulse ElectronicsIn Stock: 1024PF0581.333NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SDR1045-330M are qualified based on the following criteria:

• Inductance Match: 33 µH nominal value
• Current Rating Compatibility: Minimum 1.3 A continuous current rating (acceptable for applications where the full 1.9 A rating is not required)
• DC Resistance: Lower or equivalent maximum DCR values preferred for thermal performance
• Shielding Configuration: Unshielded topology maintained
• Operating Temperature Range: -40°C to 125°C minimum
• Surface Mount Package: Nonstandard SMD configuration
• Regulatory Compliance: ROHS3 compliant, REACH unaffected

The PF0581.333NL from Pulse Electronics meets these substitution criteria with a 33 µH inductance, 1.3 A current rating, and 115 mOhm maximum DCR, though with reduced current capacity compared to the primary part.

Parameter Comparison

Engineering Selection Recommendations

Both the SDR1045-330M and PF0581.333NL are active production components with ROHS3 compliance and REACH unaffected status, suitable for regulated applications. The SDR1045-330M provides higher current capacity at 1.9 A with saturation current of 2.1 A, making it the primary choice for applications requiring maximum current handling. The PF0581.333NL offers superior DC resistance performance at 115 mOhm maximum and tighter inductance tolerance at ±10%, making it suitable for applications where lower losses and inductance precision are prioritized over maximum current capacity. Selection between these parts depends on circuit current requirements and thermal dissipation constraints.

Frequently Asked Questions (FAQ)

Q: Can the PF0581.333NL replace the SDR1045-330M in all applications?

A: The PF0581.333NL is suitable for applications where the circuit current does not exceed 1.3 A. Applications requiring the full 1.9 A rating of the SDR1045-330M must use the primary part or equivalent higher-current alternatives.

Q: What is the impact of different DC resistance values?

A: The PF0581.333NL has 115 mOhm maximum DCR compared to 220 mOhm for the SDR1045-330M. Lower DCR reduces resistive losses and heat generation, beneficial for efficiency-critical applications. Higher DCR in the SDR1045-330M may require thermal management consideration in high-current scenarios.

Q: Are the physical dimensions compatible?

A: The SDR1045-330M measures 10.00mm x 10.00mm x 4.80mm (max height), while the PF0581.333NL measures 10.32mm x 9.32mm x 4.42mm (max height). Both are nonstandard SMD packages. PCB layout verification is required before substitution.

Q: Do both parts meet the same regulatory requirements?

A: Yes, both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings, suitable for equivalent regulatory environments.

Q: What is the difference in inductance tolerance?

A: The SDR1045-330M has ±20% tolerance, while the PF0581.333NL has ±10% tolerance. The tighter tolerance of the Pulse Electronics part provides better inductance consistency for precision circuit designs.