SDR1045-470M Equivalent & Substitute Parts

Part Overview

The SDR1045-470M is a 47 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.6 A continuous current with a maximum DC resistance of 270 mOhm. This component is designed for surface mount applications in circuits requiring fixed inductance filtering, energy storage, or impedance matching. The part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent inductance values, compatible current ratings, and matching operating temperature ranges are available from alternative manufacturers.

Substiute Parts

SDR1045-470M

Bourns Inc.In Stock: 872SDR1045-470M Datasheet

Current PartRFQ

PF0581.473NL

Pulse ElectronicsIn Stock: 837PF0581.473NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SDR1045-470M is determined by the following criteria:

Primary Matching Parameters:

• Inductance value: 47 µH (exact match required)
• Operating temperature range: -40°C ~ 125°C (minimum requirement)
• Mounting type: Surface Mount (physical compatibility)
• Shielding configuration: Unshielded (electromagnetic environment compatibility)

Secondary Compatibility Parameters:

• Current rating: Substitute must support minimum 1.1 A (acceptable if ≥80% of main part rating for non-critical applications)
• DC resistance: Lower values preferred; substitute at 166 mOhm is acceptable within engineering tolerance
• Compliance: RoHS3 and REACH status must match or exceed main part requirements

The substitute part PF0581.473NL from Pulse Electronics meets the primary matching criteria with equivalent inductance and operating temperature range. The reduced current rating (1.1 A vs. 1.6 A) and lower DC resistance (166 mOhm vs. 270 mOhm) represent acceptable trade-offs for applications where the full 1.6 A rating is not required.

Parameter Comparison

Engineering Selection Recommendations

SDR1045-470M Selection Criteria:

• Applications requiring the full 1.6 A current rating
• Designs where the ±20% inductance tolerance is acceptable
• Circuits prioritizing the Bourns SDR1045 series performance characteristics
• Inventory availability of 767 pieces supports high-volume production

PF0581.473NL Selection Criteria:

• Applications with maximum current requirements of 1.1 A or lower
• Designs benefiting from tighter ±10% inductance tolerance
• Circuits where lower DC resistance (166 mOhm) reduces power dissipation
• Pulse Electronics PF0581NL series availability of 798 pieces
• PCB layouts with space constraints favoring the lower 4.42mm profile

Both parts maintain active product status, full RoHS3 compliance, and REACH unaffected designation. Selection between these parts depends on application-specific current requirements and tolerance specifications rather than regulatory or compliance considerations.

Frequently Asked Questions (FAQ)

Q: Can PF0581.473NL directly replace SDR1045-470M in all applications?

A: Direct replacement is possible only in applications where the circuit current demand does not exceed 1.1 A. The PF0581.473NL is rated for 1.1 A continuous current versus the SDR1045-470M's 1.6 A rating. Circuit analysis must confirm that peak and sustained current levels remain within the substitute part's specification.

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

A: The SDR1045-470M has a maximum DC resistance of 270 mOhm, while the PF0581.473NL is rated at 166 mOhm maximum. Lower DC resistance reduces resistive losses and heat generation in the inductor. For applications sensitive to power dissipation, the PF0581.473NL offers improved efficiency. For applications where this difference is negligible, either part is acceptable.

Q: Are there physical compatibility concerns between these parts?

A: The parts have similar but not identical dimensions. The SDR1045-470M measures 10.00mm x 10.00mm with a maximum height of 4.80mm, while the PF0581.473NL measures 10.32mm x 9.32mm with a maximum height of 4.42mm. PCB layout and component placement must accommodate these dimensional variations. The PF0581.473NL's lower profile may provide advantages in space-constrained designs.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the SDR1045-470M and PF0581.473NL are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. Both have unlimited moisture sensitivity rating (MSL 1). Compliance requirements do not differentiate between these parts.

Q: What inductance tolerance difference should be considered?

A: The SDR1045-470M has ±20% tolerance, while the PF0581.473NL has ±10% tolerance. For circuits with tight inductance specifications, the PF0581.473NL provides superior tolerance performance. For general-purpose filtering and impedance matching applications, the ±20% tolerance of the SDR1045-470M is typically acceptable.

Q: How do the saturation current ratings compare?

A: The SDR1045-470M has a saturation current (Isat) of 1.85 A, while the PF0581.473NL is rated at 1.1 A saturation current. Saturation current represents the point at which inductance begins to degrade. Applications approaching saturation conditions require the higher saturation rating of the SDR1045-470M.