SCR105B-270 Equivalent & Substitute Parts

Part Overview

The SCR105B-270 is a 27 µH shielded inductor manufactured by Signal Transformer, rated for 2.63 A continuous current with a maximum DC resistance of 100mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

Substiute Parts

SCR105B-270

Signal TransformerIn Stock: 1089SCR105B-270 Datasheet

Current PartRFQ

SRR1050A-270Y

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR105B-270 is based on the following critical parameters:

• Inductance Value: 27 µH (primary functional requirement)
• Current Rating: Minimum 2.6 A to maintain design margin
• DC Resistance: Maximum 77mOhm to 100mOhm (lower DCR preferred for reduced losses)
• Shielding: Shielded construction required
• Mounting: Surface mount package
• Temperature Range: -40°C ~ 125°C compatibility
• Compliance: ROHS3 and REACH compliance maintained

The SRR1050A-270Y meets these substitution criteria with equivalent inductance, compatible current rating, and superior DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-270Y is the qualified substitute for the obsolete SCR105B-270. Selection is based on:

• Active Product Status: SRR1050A-270Y maintains active manufacturing status, ensuring long-term availability and supply chain continuity
• Compliance Alignment: Both parts maintain ROHS3 and REACH compliance, meeting regulatory requirements
• Electrical Compatibility: Inductance value, current rating, and operating temperature range are equivalent
• Performance Advantage: The SRR1050A-270Y provides lower DC resistance (77mOhm vs 100mOhm), resulting in reduced power dissipation
• Saturation Current: The substitute exhibits higher saturation current (2.7 A vs 1.32 A), providing improved headroom for transient conditions

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-270Y directly replace the SCR105B-270 in existing designs?

A: Yes. Both components share identical inductance values (27 µH), compatible current ratings (2.6 A vs 2.63 A), equivalent operating temperature ranges (-40°C ~ 125°C), and shielded surface mount construction. Electrical performance is maintained within design specifications.

Q: What is the impact of the different inductance tolerances (±20% vs ±30%)?

A: The SCR105B-270 specifies ±20% tolerance while the SRR1050A-270Y specifies ±30%. Applications with tight inductance tolerance requirements must evaluate circuit sensitivity to this wider tolerance band during design validation.

Q: How does the lower DC resistance of the SRR1050A-270Y affect circuit performance?

A: The substitute part exhibits 77mOhm maximum DCR compared to 100mOhm maximum for the original part. This 23% reduction in resistance decreases I²R losses, resulting in lower heat generation and improved efficiency in current-carrying applications.

Q: Are there physical dimension differences between these parts?

A: Minor dimensional variations exist. The SCR105B-270 measures 10.50mm L × 9.50mm W × 5.50mm H, while the SRR1050A-270Y measures 10.20mm L × 10.00mm W × 5.10mm H. PCB layout and component placement must accommodate these differences.

Q: What packaging format is the SRR1050A-270Y supplied in?

A: The SRR1050A-270Y is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly operations.