SCR105B-331 Equivalent & Substitute Parts

Part Overview

The SCR105B-331 is a 330 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 780 mA and maximum DC resistance of 1.2Ohm. 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 meets ROHS3 compliance requirements.

Substiute Parts

SCR105B-331

Signal TransformerIn Stock: 1164SCR105B-331 Datasheet

Current PartRFQ

7447714331

Würth ElektronikIn Stock: 21807447714331 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCR105B-331 is determined by the following critical parameters:

• Inductance Value: 330 µH with ±20% tolerance
• Current Rating: Minimum 780 mA to support original circuit requirements
• DC Resistance: Maximum 1.2Ohm to maintain electrical performance
• Shielding: Shielded construction required for EMI containment
• Mounting Type: Surface mount configuration
• Operating Temperature Range: -40°C to 125°C minimum
• RoHS Compliance: ROHS3 Compliant status

The Würth Elektronik part 7447714331 qualifies as a substitute based on matching inductance value, shielding type, surface mount configuration, and operating temperature range. While the current rating (710 mA) is lower than the original specification, the DC resistance (750mOhm) is superior, and the part maintains active product status with AEC-Q200 certification.

Parameter Comparison

Engineering Selection Recommendations

The 7447714331 from Würth Elektronik is an active substitute for the obsolete SCR105B-331. Both components maintain ROHS3 compliance and operate within the same temperature range. The substitute part carries AEC-Q200 certification, indicating automotive-grade reliability qualification. The lower current rating of 710 mA versus 780 mA requires circuit-level evaluation to confirm suitability for the intended application. The superior DC resistance of 750mOhm compared to 1.2Ohm provides improved thermal performance and reduced power dissipation. The substitute is available in standard Tape & Reel packaging, supporting modern manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the 7447714331 directly replace the SCR105B-331 in all applications?

A: The substitute matches critical parameters including inductance value, tolerance, shielding, mounting type, and operating temperature range. However, the current rating difference (710 mA vs. 780 mA) requires verification that circuit peak current demands do not exceed 710 mA. The improved DC resistance of the substitute is advantageous for thermal management.

Q: What is the significance of the current rating difference?

A: The original part is rated for 780 mA continuous current, while the substitute is rated for 710 mA. Applications operating near or above 710 mA require detailed circuit analysis to confirm the substitute can handle the intended load without saturation or thermal stress.

Q: Are both parts RoHS compliant?

A: Yes, both the SCR105B-331 and 7447714331 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

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

A: The 7447714331 exhibits 750mOhm maximum DC resistance compared to 1.2Ohm in the original part. Lower DC resistance reduces I²R power losses, resulting in lower operating temperatures and improved efficiency in the circuit.

Q: Why is the original part obsolete?

A: The SCR105B-331 is classified as obsolete by Signal Transformer. The active substitute from Würth Elektronik provides continued design support and procurement availability for applications requiring 330 µH shielded surface mount inductors.

Q: Does packaging affect substitution compatibility?

A: The original part uses nonstandard packaging, while the substitute is supplied in standard Tape & Reel format. This improves handling, storage, and automated assembly compatibility for modern manufacturing environments.