SC105B-220 Equivalent & Substitute Parts

Part Overview

The SC105B-220 is a 22 µH unshielded wirewound inductor rated for 2.4 A continuous current with a maximum DC resistance of 100mOhm. Manufactured by Signal Transformer, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for design continuity and procurement planning.

Substiute Parts

SC105B-220

Signal TransformerIn Stock: 1030SC105B-220 Datasheet

Current PartRFQ

7447714220

Würth ElektronikIn Stock: 18587447714220 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC105B-220 is determined by the following critical parameters:

• Inductance Value: Must be 22 µH with ±20% tolerance to maintain circuit performance
• Current Rating: Substitute must support minimum 2.4 A continuous current; higher ratings provide design margin
• DC Resistance: Lower DCR values reduce power dissipation and improve efficiency
• Operating Temperature Range: Must span -40°C to 125°C for thermal compatibility
• Mounting Type: Surface mount requirement must be maintained
• Compliance: RoHS3 compliance required for regulatory alignment

The substitute part 7447714220 (Würth Elektronik WE-PD Performance series) meets all substitution criteria with improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 7447714220 substitute part is qualified for direct replacement based on the following factors:

• Inductance Match: Both parts specify 22 µH with identical ±20% tolerance
• Current Capability: The substitute provides 3 A rating versus 2.4 A required, offering 25% design margin
• Improved DCR: Reduced DC resistance (50 mOhm vs. 100 mOhm) decreases power dissipation by 50%
• Active Status: The substitute is in active production with confirmed inventory availability (1842 pcs), ensuring long-term supply
• Compliance Alignment: Both parts maintain ROHS3 compliance and identical operating temperature range
• Shielding Upgrade: The substitute features shielded construction, providing electromagnetic interference mitigation not present in the original unshielded design

Frequently Asked Questions (FAQ)

Q: Can the 7447714220 directly replace the SC105B-220 in existing designs?

A: Yes. Both inductors share the same 22 µH inductance value and ±20% tolerance. The substitute meets or exceeds all critical electrical parameters including current rating, saturation current, and operating temperature range. Surface mount compatibility is maintained.

Q: What is the impact of the lower DC resistance in the substitute part?

A: Lower DC resistance (50 mOhm vs. 100 mOhm) reduces resistive losses and heat generation during operation. This improves circuit efficiency and thermal performance without affecting inductance characteristics.

Q: Does the shielded construction of the substitute affect circuit behavior?

A: Shielded construction reduces electromagnetic radiation and susceptibility to external interference. This is a functional improvement that does not degrade circuit performance and may enhance EMI compliance in the application.

Q: Are there packaging considerations for the substitute part?

A: The substitute is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly. The original part used nonstandard packaging. TR packaging is compatible with standard pick-and-place equipment.

Q: Why is the substitute part recommended despite the original part being in stock?

A: The SC105B-220 is classified as obsolete with no active manufacturing. The substitute 7447714220 is in active production with significantly higher inventory availability (1842 pcs), ensuring supply continuity and reducing procurement risk for future production runs.