SC105B-820 Equivalent & Substitute Parts

Part Overview

The SC105B-820 is a 82 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 1.3 A continuous current with a maximum DC resistance of 333mOhm. 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 packaged in a nonstandard surface mount configuration measuring 10.90mm × 9.80mm × 6.00mm (max height).

Substiute Parts

SC105B-820

Signal TransformerIn Stock: 867SC105B-820 Datasheet

Current PartRFQ

SRR1050A-820Y

Bourns Inc.In Stock: 1513SRR1050A-820Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR1050A-820Y qualifies as a substitute for the SC105B-820 based on the following critical parameters:

• Inductance Match: Both parts provide 82 µH inductance, meeting the core functional requirement
• Current Rating Compatibility: The SRR1050A-820Y is rated for 1.45 A, exceeding the SC105B-820's 1.3 A requirement
• Saturation Current: The substitute's 1.5 A Isat rating exceeds the original's 1 A specification
• Temperature Range Alignment: Both operate across -40°C to 125°C
• Surface Mount Compatibility: Both are surface mount components with comparable physical dimensions (10.20mm × 10.00mm × 5.10mm max height vs. 10.90mm × 9.80mm × 6.00mm)
• Compliance Standards: Both are ROHS3 compliant and REACH unaffected

The SRR1050A-820Y introduces shielding and ferrite core construction, which represent functional enhancements rather than incompatibilities. The lower DCR (230mOhm vs. 333mOhm) and higher tolerance (±30% vs. ±20%) are secondary considerations that do not prevent substitution in applications where the SC105B-820 was specified.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-820Y is the qualified substitute for SC105B-820 applications. Selection is supported by:

• Active Product Status: The SRR1050A-820Y maintains active production status, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: Both parts meet ROHS3 and REACH requirements, maintaining environmental and regulatory alignment
• AEC-Q200 Certification: The SRR1050A-820Y carries AEC-Q200 automotive-grade qualification, providing additional reliability assurance
• Performance Margin: The substitute's higher current rating (1.45 A vs. 1.3 A) and saturation current (1.5 A vs. 1 A) provide operational headroom
• Improved DC Resistance: The lower DCR of the substitute reduces power dissipation in the inductor

The transition from unshielded to shielded construction in the substitute may require electromagnetic compatibility (EMC) evaluation in noise-sensitive applications, though shielding typically provides system-level benefits.

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-820Y directly replace the SC105B-820 in existing designs?

A: Yes, the SRR1050A-820Y meets or exceeds all critical electrical parameters of the SC105B-820. Both parts provide 82 µH inductance, operate across -40°C to 125°C, and are surface mount components. Physical dimensions are comparable, though PCB layout verification is recommended due to nonstandard package geometry.

Q: What is the significance of the shielding difference?

A: The SC105B-820 is unshielded, while the SRR1050A-820Y is shielded with ferrite drum core construction. Shielding reduces electromagnetic radiation and susceptibility, which is beneficial in most applications. In designs where unshielded operation was specifically required, shielding does not create incompatibility but may alter circuit behavior in sensitive RF or high-frequency applications.

Q: How do the tolerance specifications affect substitution?

A: The SC105B-820 specifies ±20% tolerance, while the SRR1050A-820Y specifies ±30%. Both tolerances encompass the nominal 82 µH value. Applications requiring tighter inductance tolerance should evaluate whether the ±30% specification of the substitute meets circuit requirements.

Q: Are there packaging considerations for this substitution?

A: Both parts use nonstandard surface mount packages with similar footprints (10.90mm × 9.80mm vs. 10.20mm × 10.00mm). Height differs slightly (6.00mm max vs. 5.10mm max). PCB layout and component placement should be verified to ensure mechanical clearance and thermal management compatibility.

Q: What is the availability status of these parts?

A: The SC105B-820 is obsolete with 804 pieces in stock. The SRR1050A-820Y is active production with 1447 pieces in stock, ensuring reliable long-term supply for new designs and production continuity.