SCR105B-221 Equivalent & Substitute Parts

Part Overview

The SCR105B-221 is a 220 µH shielded inductor manufactured by Signal Transformer, rated for 900 mA continuous current with a maximum DC resistance of 780mOhm. This component is designed for surface mount applications in nonstandard packaging. The part is currently obsolete, making identification of suitable substitutes necessary for ongoing production and maintenance applications where this inductor is specified in existing designs.

Substiute Parts

SCR105B-221

Signal TransformerIn Stock: 821SCR105B-221 Datasheet

Current PartRFQ

7447714221

Würth ElektronikIn Stock: 34577447714221 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR105B-221 is based on the following critical parameters:

• Inductance Value: 220 µH with ±20% tolerance
• Current Rating: Minimum 900 mA continuous current capability
• DC Resistance: Maximum 780 mOhm to maintain circuit performance
• Shielding: Shielded construction required
• Operating Temperature: -40°C ~ 125°C range
• Mounting Type: Surface mount configuration
• Environmental Compliance: ROHS3 compliance required

The Würth Elektronik 7447714221 meets these substitution criteria with equivalent inductance, superior current rating (1 A vs 900 mA), lower DC resistance (439 mOhm vs 780 mOhm), and identical temperature operating range. Both components are shielded, surface mount inductors with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 7447714221 is the qualified substitute for the obsolete SCR105B-221. Both components maintain identical inductance values and tolerance specifications. The substitute provides improved electrical performance with higher current rating (1 A vs 900 mA), superior saturation current (1.2 A vs 470 mA), and reduced DC resistance (439 mOhm vs 780 mOhm). Both parts maintain identical operating temperature ranges and environmental compliance certifications (ROHS3, MSL 1). The substitute is currently in active production status with 3400 units available in inventory, ensuring supply continuity for replacement and new production applications.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 7447714221 directly replace the Signal Transformer SCR105B-221?

A: Yes. Both inductors provide 220 µH inductance with ±20% tolerance, operate across -40°C to 125°C, feature shielded construction, and are surface mount components with ROHS3 compliance. The substitute offers superior electrical performance with higher current rating and lower DC resistance.

Q: What are the key differences between these two inductors?

A: The primary differences are current handling capability (1 A vs 900 mA), saturation current (1.2 A vs 470 mA), and DC resistance (439 mOhm vs 780 mOhm). The Würth Elektronik part provides better thermal and electrical performance margins.

Q: Are there any package or mounting considerations?

A: Both components use nonstandard surface mount packaging. Physical dimensions differ slightly (10.00mm x 10.00mm x 5.00mm for the substitute vs 10.50mm x 9.50mm x 5.50mm for the original). Verify PCB layout compatibility before implementation.

Q: What is the product status of each part?

A: The SCR105B-221 is obsolete. The Würth Elektronik 7447714221 is active production with current inventory availability.

Q: Are both parts environmentally compliant?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity level).