SCR105B-390 Equivalent & Substitute Parts

Part Overview

The SCR105B-390 is a 39 µH shielded inductor manufactured by Signal Transformer, rated for 2.14 A continuous current with a maximum DC resistance of 120mOhm. This component is designed for surface mount applications in nonstandard package configurations. The part is currently obsolete, making identification of compatible substitutes essential for ongoing production support and design continuity.

Substiute Parts

SCR105B-390

Signal TransformerIn Stock: 1082SCR105B-390 Datasheet

Current PartRFQ

SRR1050A-390Y

Bourns Inc.In Stock: 1406SRR1050A-390Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR105B-390 is determined by the following critical parameters:

• Inductance Value: 39 µH nominal (tolerance range acceptable within design margins)
• Current Rating: Minimum 2.14 A continuous current capability
• DC Resistance: Maximum 120 mOhm to maintain thermal and efficiency specifications
• Shielding: Shielded construction required for EMI containment
• Operating Temperature: -40°C to 125°C range compliance
• Mounting: Surface mount configuration
• Environmental Compliance: ROHS3 and REACH compliance required

The SRR1050A-390Y meets these substitution criteria with equivalent inductance, superior current rating, comparable DC resistance, and full environmental compliance.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-390Y is a direct functional substitute for the SCR105B-390 based on the following criteria:

• Electrical Equivalence: Identical inductance value with superior current rating and lower DC resistance, providing improved thermal performance and reduced power dissipation.
• Environmental Compliance: Both parts maintain ROHS3 and REACH compliance with MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes.
• Production Status: The SRR1050A-390Y is in active production with established supply chain availability, whereas the SCR105B-390 is obsolete. This substitution ensures long-term component availability and design continuity.
• Mechanical Compatibility: Physical dimensions are similar with minor variations. PCB layout verification is required to confirm pad alignment and clearance.
• Certification: The SRR1050A-390Y carries AEC-Q200 qualification, providing automotive-grade reliability assurance.

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-390Y be used as a direct replacement for the SCR105B-390 without circuit modifications?

A: The SRR1050A-390Y meets all critical electrical parameters (inductance, current rating, DC resistance, temperature range) required for functional equivalence. However, physical dimensions differ slightly (10.20mm × 10.00mm × 5.10mm versus 10.50mm × 9.50mm × 5.50mm). PCB layout verification is necessary to confirm pad spacing compatibility and ensure proper component placement.

Q: What are the key differences in inductance tolerance between these parts?

A: The SCR105B-390 specifies ±20% tolerance, while the SRR1050A-390Y specifies ±30% tolerance. The wider tolerance of the substitute is acceptable for most applications where the nominal 39 µH value is the design target, provided circuit performance remains within acceptable margins across the tolerance range.

Q: How do the DC resistance specifications compare?

A: The SRR1050A-390Y has a maximum DC resistance of 106 mOhm, which is lower than the SCR105B-390 specification of 120 mOhm. Lower DC resistance reduces power dissipation and heat generation, providing improved thermal performance in the substitute part.

Q: Are there packaging or supply chain considerations for this substitution?

A: The SRR1050A-390Y is supplied in Tape & Reel (TR) packaging with active production status and established inventory availability. The SCR105B-390 is obsolete. The substitute ensures reliable long-term supply for production requirements.

Q: What certifications does the SRR1050A-390Y carry?

A: The SRR1050A-390Y is AEC-Q200 qualified, ROHS3 compliant, and REACH unaffected. These certifications meet automotive and industrial reliability standards equivalent to or exceeding the original part specifications.