SC105B-561 Equivalent & Substitute Parts

Part Overview

The SC105B-561 is a 560 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 470 mA continuous current with a maximum DC resistance of 1.9 Ohm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

SC105B-561

Signal TransformerIn Stock: 929SC105B-561 Datasheet

Current PartRFQ

SRU1048-561Y

Bourns Inc.In Stock: 1016SRU1048-561Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SC105B-561 is based on the following critical parameters:

• Inductance Value: 560 µH (primary electrical requirement)
• Current Rating: 470 mA minimum continuous current capability
• Mounting Type: Surface Mount configuration
• Operating Temperature Range: -40°C to 125°C
• Compliance Standards: ROHS3 and REACH compliance

The substitute part SRU1048-561Y meets these core electrical and mechanical requirements. While differences exist in shielding type, core material, and DC resistance, the substitute maintains functional equivalence for applications where the SC105B-561 was specified, provided circuit design accounts for the parameter variations documented in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

The SRU1048-561Y from Bourns Inc. is an active production substitute for the obsolete SC105B-561. Both components maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring regulatory compatibility in existing supply chains.

Key differences in the substitute require circuit-level evaluation:

• DC Resistance: The SRU1048-561Y exhibits significantly lower DCR (890 mOhm versus 1.9 Ohm), reducing power dissipation and heat generation in the inductor.
• Inductance Tolerance: The substitute has wider tolerance (±30% versus ±20%), which may impact frequency-dependent circuit performance.
• Shielding: The SRU1048-561Y is shielded, reducing electromagnetic interference emission compared to the unshielded original.
• Saturation Current: The substitute provides higher saturation margin (370 mA versus 330 mA), offering improved headroom at rated current.

Selection of the SRU1048-561Y is appropriate for applications where the original SC105B-561 is no longer available and circuit design can accommodate the documented parameter variations.

Frequently Asked Questions (FAQ)

Q: Can the SRU1048-561Y directly replace the SC105B-561 in existing designs?

A: Direct replacement is possible from an electrical standpoint, as both components share identical inductance values and current ratings. However, the lower DC resistance and shielded construction of the SRU1048-561Y may alter circuit behavior. Circuit simulation or prototype testing is recommended to confirm performance in applications sensitive to DCR or electromagnetic coupling.

Q: What is the impact of the wider inductance tolerance on the SRU1048-561Y?

A: The SRU1048-561Y tolerance of ±30% is wider than the SC105B-561 tolerance of ±20%. In circuits where inductance value is critical to frequency response or impedance matching, this tolerance difference may require design margin adjustment or component selection screening.

Q: Why is the SRU1048-561Y shielded while the SC105B-561 is unshielded?

A: Shielding reduces electromagnetic field radiation from the inductor, minimizing interference with adjacent circuit components. In applications where the original unshielded design was intentional for coupling purposes, the shielded substitute may require circuit redesign to maintain intended performance.

Q: Are both components available in the same package configuration?

A: Both components are surface mount inductors with nonstandard package dimensions. The SC105B-561 measures 10.90mm × 9.80mm × 6.00mm (max height), while the SRU1048-561Y measures 10.00mm × 10.00mm × 5.10mm (max height). Verify PCB footprint compatibility before implementation.

Q: What compliance certifications apply to both parts?

A: Both the SC105B-561 and SRU1048-561Y are ROHS3 compliant and REACH unaffected, ensuring regulatory compatibility in industrial and commercial applications across regulated markets.