SC105B-270 Equivalent & Substitute Parts

Part Overview

The SC105B-270 is a 27 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 2.1 A continuous current with a maximum DC resistance of 136 mOhm. This component is classified as obsolete, making 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-270

Signal TransformerIn Stock: 734SC105B-270 Datasheet

Current PartRFQ

SRR1050A-270Y

Bourns Inc.In Stock: 1509SRR1050A-270Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SC105B-270 is based on the following critical parameters:

• Inductance Value: 27 µH (primary electrical requirement)
• Current Rating: Minimum 2.1 A to meet or exceed the original specification
• DC Resistance: Lower or equivalent DCR values are acceptable
• Mounting Type: Surface mount compatibility required
• Operating Temperature: -40°C to 125°C range support
• Compliance: ROHS3 and REACH compliance maintained

The SRR1050A-270Y from Bourns Inc. meets these substitution criteria with improved electrical performance characteristics while maintaining mechanical and thermal compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-270Y is the qualified substitute for the SC105B-270 based on the following factors:

• Product Status: The SRR1050A-270Y is active production, ensuring long-term availability and supply chain stability, whereas the SC105B-270 is obsolete.
• Electrical Performance: The substitute provides superior current handling (2.6 A vs. 2.1 A) and lower DC resistance (77 mOhm vs. 136 mOhm), delivering improved efficiency and thermal performance.
• Compliance: Both parts maintain ROHS3 and REACH compliance with identical moisture sensitivity ratings.
• Thermal Compatibility: Identical operating temperature range (-40°C to 125°C) ensures thermal performance equivalence.
• Mechanical Fit: Both components are surface mount with comparable physical dimensions, supporting direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-270Y directly replace the SC105B-270 in existing designs?

A: Yes. Both inductors share the same 27 µH inductance value, identical operating temperature range, and surface mount configuration. The substitute provides equal or superior electrical performance across all critical parameters.

Q: What is the impact of the shielding difference between the two parts?

A: The SC105B-270 is unshielded while the SRR1050A-270Y is shielded. Shielding reduces electromagnetic interference emission and susceptibility. This difference may require PCB layout evaluation in noise-sensitive applications, but the substitute is functionally compatible.

Q: Does the inductance tolerance difference affect substitution?

A: The SC105B-270 has ±20% tolerance while the SRR1050A-270Y has ±30% tolerance. Both parts deliver the specified 27 µH nominal inductance. Circuit designs must accommodate the tolerance range of the selected component.

Q: Is the SRR1050A-270Y available in the same packaging format?

A: The SRR1050A-270Y is supplied in Tape & Reel (TR) packaging, suitable for automated assembly. Verify packaging requirements for your production process.

Q: What are the advantages of the lower DC resistance in the substitute part?

A: The SRR1050A-270Y exhibits 77 mOhm maximum DCR compared to 136 mOhm in the original part. Lower resistance reduces I²R losses, improving power efficiency and reducing thermal dissipation in the inductor.