SC105B-101 Equivalent & Substitute Parts

Part Overview

The SC105B-101 is a 100 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 1.2 A continuous current with a maximum DC resistance of 370mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is packaged in a nonstandard surface mount form factor measuring 10.90mm × 9.80mm × 6.00mm (max height).

Substiute Parts

SC105B-101

Signal TransformerIn Stock: 989SC105B-101 Datasheet

Current PartRFQ

7447714101

Würth ElektronikIn Stock: 26447447714101 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC105B-101 is determined by the following critical parameters:

• Inductance Value: 100 µH (±20% tolerance acceptable)
• Current Rating: Minimum 1.2 A continuous; saturation current must not fall below operating requirements
• DC Resistance: Lower DCR values improve efficiency; 370 mOhm is the maximum acceptable for the original part
• Operating Temperature: -40°C to 125°C range must be maintained
• Mounting Type: Surface mount configuration required
• Environmental Compliance: ROHS3 compliance and MSL 1 rating required

The substitute part 7447714101 (Würth Elektronik WE-PD Performance series) meets these criteria with equivalent inductance, superior current rating (1.5 A vs. 1.2 A), improved DC resistance (198 mOhm vs. 370 mOhm), and active product status. The substitute maintains identical temperature range and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 7447714101 (Würth Elektronik WE-PD Performance series) is a direct functional substitute for the obsolete SC105B-101. Selection is supported by:

• Compliance Alignment: Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility
• Active Product Status: The substitute is actively manufactured and stocked (2600 pcs available), eliminating obsolescence risk
• Performance Enhancement: The substitute provides superior electrical characteristics with 46% lower DC resistance (198 mOhm vs. 370 mOhm) and 25% higher current rating (1.5 A vs. 1.2 A), enabling improved thermal performance and design margin
• AEC-Q200 Certification: The substitute carries automotive-grade reliability qualification, providing additional assurance for critical applications
• Shielded Construction: The substitute's shielded drum core design reduces electromagnetic interference compared to the unshielded original, beneficial in noise-sensitive circuits

Frequently Asked Questions (FAQ)

Q: Can the 7447714101 directly replace the SC105B-101 in existing designs?

A: Yes. Both parts share identical inductance (100 µH ±20%), tolerance, operating temperature range (-40°C to 125°C), and surface mount configuration. The substitute exceeds the original's current rating and DC resistance specifications, making it electrically compatible for the same application space.

Q: What is the impact of the shielded vs. unshielded construction difference?

A: The 7447714101 uses shielded drum core construction, while the SC105B-101 is unshielded. Shielding reduces radiated electromagnetic interference, which is advantageous in most applications. If the original design specifically required unshielded characteristics for coupling purposes, this difference must be evaluated in circuit context.

Q: Does the lower DC resistance of the substitute affect circuit behavior?

A: Lower DC resistance (198 mOhm vs. 370 mOhm) reduces resistive losses and heat generation, improving efficiency. This is a beneficial change that does not compromise compatibility. The substitute's improved thermal performance provides additional design margin.

Q: Are there packaging differences between these parts?

A: Both parts use nonstandard surface mount packages with similar footprints (SC105B-101: 10.90mm × 9.80mm; 7447714101: 10.00mm × 10.00mm). The 7447714101 is supplied in Tape & Reel packaging, while the SC105B-101 packaging format is not specified. Verify tape specifications if automated assembly is required.

Q: What certifications does the substitute carry?

A: The 7447714101 carries AEC-Q200 automotive-grade qualification, ROHS3 compliance, and REACH unaffected status, matching or exceeding the original part's compliance profile.