SC105B-271 Equivalent & Substitute Parts

Part Overview

The SC105B-271 is a 270 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 720 mA continuous current with a maximum DC resistance of 970mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is mounted as a surface mount component in a nonstandard package configuration.

Substiute Parts

SC105B-271

Signal TransformerIn Stock: 812SC105B-271 Datasheet

Current PartRFQ

SRR1050A-271Y

Bourns Inc.In Stock: 2667SRR1050A-271Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC105B-271 is based on the following critical parameters:

• Inductance Value: 270 µH nominal (tolerance range determines acceptable deviation)
• Current Rating: Minimum 720 mA to maintain circuit performance
• DC Resistance: Maximum 970 mOhm to preserve power efficiency characteristics
• Mounting Type: Surface mount configuration required
• Temperature Range: -40°C to 125°C operational compatibility
• Regulatory Compliance: ROHS3 compliance mandatory

The SRR1050A-271Y from Bourns Inc. meets these substitution criteria with equivalent inductance, higher current rating capability, and improved DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-271Y is the manufacturer-recommended substitute for the obsolete SC105B-271. Both components maintain ROHS3 compliance and identical moisture sensitivity ratings. The substitute provides superior electrical performance through reduced DC resistance (675 mOhm versus 970 mOhm), enabling lower power dissipation in the inductor. Current rating capability increases from 720 mA to 800 mA, with saturation current rising from 570 mA to 840 mA, providing enhanced margin for transient conditions.

The SRR1050A-271Y incorporates shielding and ferrite drum core construction compared to the unshielded wirewound design of the original part. This configuration may reduce electromagnetic interference in sensitive applications. The substitute maintains active product status with established supply chain availability, ensuring long-term procurement reliability.

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-271Y directly replace the SC105B-271 in existing designs?

A: The SRR1050A-271Y meets the critical electrical parameters of the SC105B-271, including inductance value, current rating, and operating temperature range. Physical dimensions differ slightly, requiring verification of PCB layout compatibility. The shielded construction of the substitute may alter electromagnetic coupling characteristics in circuits sensitive to magnetic field distribution.

Q: What is the impact of the increased DC resistance tolerance in the substitute?

A: The SRR1050A-271Y specifies ±30% inductance tolerance compared to ±20% for the original part. This wider tolerance band requires circuit validation if inductance accuracy is critical to system performance. The substitute's maximum DC resistance of 675 mOhm is superior to the original 970 mOhm specification, reducing power loss regardless of tolerance variation.

Q: Are there package or mounting considerations for substitution?

A: Both components are surface mount devices in nonstandard package configurations. Physical dimensions vary: SC105B-271 measures 10.90mm × 9.80mm × 6.00mm (max height), while SRR1050A-271Y measures 10.20mm × 10.00mm × 5.10mm (max height). PCB footprint and clearance verification is required before implementation.

Q: Does the shielded design of the substitute affect circuit performance?

A: The SRR1050A-271Y incorporates shielding, which reduces radiated electromagnetic interference compared to the unshielded SC105B-271. In applications where magnetic coupling to adjacent components is intentional, this design difference may require circuit re-evaluation. The ferrite drum core construction also affects frequency response characteristics.

Q: What certifications apply to both components?

A: Both the SC105B-271 and SRR1050A-271Y are ROHS3 compliant and REACH unaffected. The SRR1050A-271Y carries AEC-Q200 automotive qualification, providing additional reliability assurance for demanding applications.