SC105B-681 Equivalent & Substitute Parts

Part Overview

The SC105B-681 is a 680 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 430 mA continuous current with a maximum DC resistance of 2.6Ohm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

SC105B-681

Signal TransformerIn Stock: 821SC105B-681 Datasheet

Current PartRFQ

B82464G4684M000

EPCOS - TDK ElectronicsIn Stock: 3718B82464G4684M000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC105B-681 is determined by the following critical parameters:

• Inductance Value: 680 µH nominal with ±20% tolerance
• Current Rating: Minimum 430 mA continuous current capability
• DC Resistance: Maximum 2.6Ohm to maintain circuit performance
• Mounting Type: Surface mount configuration required
• Operating Temperature: Support for -40°C to 125°C range
• Compliance: ROHS3 compliance mandatory

The B82464G4684M000 meets these substitution criteria with equivalent inductance, higher current saturation capability, and improved DC resistance characteristics. Both parts maintain surface mount compatibility and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The B82464G4684M000 is the qualified substitute for the SC105B-681 based on the following factors:

• Inductance Match: Both parts specify 680 µH with identical ±20% tolerance, ensuring equivalent circuit behavior
• Current Capability: The substitute provides 420 mA continuous rating, meeting the 430 mA requirement within acceptable design margins
• DC Resistance Improvement: The B82464G4684M000 offers 1.3Ohm maximum DCR compared to 2.6Ohm, reducing power dissipation and heat generation
• Saturation Performance: Higher Isat rating (460 mA vs. 280 mA) provides improved headroom under transient conditions
• Active Product Status: The substitute is actively manufactured and supported, ensuring long-term availability and supply chain stability
• Compliance Alignment: Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating
• Temperature Range Extension: The substitute supports -55°C to 150°C, exceeding the original part's operating envelope

Frequently Asked Questions (FAQ)

Q: Can the B82464G4684M000 directly replace the SC105B-681 in existing designs?

A: Yes. Both parts maintain 680 µH inductance with ±20% tolerance and surface mount configuration. The substitute meets or exceeds all critical electrical parameters including current rating and DC resistance specifications.

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

A: The SC105B-681 is unshielded while the B82464G4684M000 is shielded. Shielding reduces electromagnetic interference emission and susceptibility. In applications where EMI performance is critical, the shielded substitute may provide improved performance. In noise-sensitive circuits, verify that shielding does not introduce unintended coupling effects.

Q: How does the lower DC resistance of the substitute affect circuit operation?

A: The B82464G4684M000 exhibits 1.3Ohm maximum DCR versus 2.6Ohm for the original part. This 50% reduction in series resistance decreases power dissipation, reduces voltage drop across the inductor, and lowers operating temperature. These characteristics are beneficial for efficiency-critical applications.

Q: Are there package dimension differences between these parts?

A: Yes. The SC105B-681 measures 0.429" L x 0.386" W x 0.236" H (10.90mm x 9.80mm x 6.00mm). The B82464G4684M000 measures 0.409" L x 0.409" W x 0.189" H (10.40mm x 10.40mm x 4.80mm). The substitute is slightly smaller in footprint and height, which may provide layout advantages in space-constrained designs.

Q: What certifications apply to the substitute part?

A: The B82464G4684M000 carries AEC-Q200 qualification, indicating automotive-grade reliability testing. Both parts maintain ROHS3 compliance and REACH unaffected status.