SDR1045-100M Equivalent & Substitute Parts

Part Overview

The SDR1045-100M is a 10 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 3.2 A continuous current with a maximum DC resistance of 64 mOhm. This component is designed for surface mount applications in circuits requiring fixed inductance values with moderate current handling capability. The part maintains active product status and is ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified when equivalent inductance values, compatible current ratings, and matching operating temperature ranges are available from alternative manufacturers, enabling procurement flexibility and supply chain optimization.

Substiute Parts

SDR1045-100M

Bourns Inc.In Stock: 1373SDR1045-100M Datasheet

Current PartRFQ

PF0581.103NL

Pulse ElectronicsIn Stock: 3425PF0581.103NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SDR1045-100M is determined by the following criteria:

Primary Matching Parameters:

• Inductance value: 10 µH (exact match required)
• Shielding configuration: Unshielded (must match)
• Mounting type: Surface Mount (must match)
• Operating temperature range: -40°C ~ 125°C (must encompass or match)

Secondary Compatibility Parameters:

• Current rating: Substitute must support minimum 2.5 A (80% of main part rating acceptable for applications with reduced current demand)
• DC resistance: Lower or equal values preferred; higher values acceptable if circuit design permits
• Tolerance: ±10% to ±20% acceptable for fixed inductance applications
• Compliance: ROHS3 and REACH status must match or exceed main part requirements

The substitute part PF0581.103NL from Pulse Electronics meets the primary matching criteria with identical inductance and operating temperature range. The reduced current rating (2.5 A vs. 3.2 A) and lower DC resistance (43 mOhm vs. 64 mOhm) position this part as suitable for applications operating within the 2.5 A threshold.

Parameter Comparison

Engineering Selection Recommendations

Selection between the SDR1045-100M and PF0581.103NL is determined by application current requirements and compliance obligations:

SDR1045-100M Selection Criteria:

• Applications requiring continuous current operation at or above 2.5 A up to 3.2 A
• Designs where saturation current margin of 3.6 A is necessary
• Circuits tolerating higher DC resistance (64 mOhm) without performance degradation

PF0581.103NL Selection Criteria:

• Applications operating at continuous currents up to 2.5 A
• Designs benefiting from lower DC resistance (43 mOhm) for reduced power dissipation
• Circuits where tighter inductance tolerance (±10%) improves performance
• Supply chain scenarios where Pulse Electronics inventory availability is advantageous

Both parts maintain identical ROHS3 compliance, REACH unaffected status, and operating temperature specifications, ensuring regulatory and environmental compatibility across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can PF0581.103NL replace SDR1045-100M in all applications?

A: Substitution is valid only for applications where continuous current does not exceed 2.5 A. The PF0581.103NL saturation current rating of 2.5 A establishes the upper operational limit. Applications requiring the full 3.2 A rating of the SDR1045-100M must use the original part.

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

A: The PF0581.103NL exhibits 43 mOhm DC resistance compared to 64 mOhm for the SDR1045-100M. Lower resistance reduces power dissipation (I²R losses) and heat generation. For current-limited applications, this difference may be negligible; for high-current or thermally sensitive designs, the lower resistance of the substitute may provide operational advantages.

Q: Are the physical dimensions compatible?

A: The SDR1045-100M measures 10.00mm L x 10.00mm W x 4.80mm H (seated). The PF0581.103NL measures 10.32mm L x 9.32mm W x 4.42mm H (seated). Both are nonstandard packages. PCB layout verification is required to confirm mechanical fit, as dimensional differences may affect placement in space-constrained designs.

Q: Do tolerance differences affect circuit performance?

A: The SDR1045-100M carries ±20% tolerance while PF0581.103NL carries ±10% tolerance. The tighter tolerance of the substitute may improve circuit performance in applications sensitive to inductance variation, such as resonant circuits or precision filtering networks.

Q: Are both parts suitable for high-temperature applications?

A: Both parts operate across the identical temperature range of -40°C to 125°C. No thermal performance differentiation exists between the two parts based on provided specifications.