SCR105B-471 Equivalent & Substitute Parts

Part Overview

The SCR105B-471 is a 470 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 630 mA and maximum DC resistance of 1.5Ohm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SCR105B-471

Signal TransformerIn Stock: 770SCR105B-471 Datasheet

Current PartRFQ

7447714471

Würth ElektronikIn Stock: 40647447714471 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR105B-471 is determined by strict equivalence across the following critical parameters:

• Inductance Value: 470 µH with ±20% tolerance
• Current Rating: Minimum 630 mA to maintain circuit performance
• DC Resistance: Maximum 1.5Ohm to ensure acceptable power dissipation
• Shielding Configuration: Shielded construction required
• Operating Temperature: -40°C to 125°C range
• Mounting Technology: Surface mount only
• Physical Footprint: Nonstandard package dimensions (10.50mm x 9.50mm x 5.50mm max height)
• Compliance: ROHS3 compliant, MSL 1

The substitute part must satisfy all these parameters simultaneously. Deviations in any single parameter disqualify the part from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 7447714471 serves as an active substitute for the obsolete SCR105B-471. Both parts maintain identical inductance values, tolerance specifications, and operating temperature ranges. The substitute demonstrates superior electrical performance with lower DC resistance (1.1Ohm vs. 1.5Ohm maximum) and higher saturation current (820 mA vs. 330 mA), providing enhanced margin in circuit operation.

The primary consideration is the current rating differential: the substitute is rated at 600 mA versus the original 630 mA specification. Circuit designs operating at or near the 630 mA threshold require thermal analysis to confirm the substitute's adequacy. The lower DCR of the substitute typically results in reduced power dissipation, partially offsetting the lower current rating.

Physical dimensions differ slightly (10.00mm x 10.00mm x 5.00mm for the substitute versus 10.50mm x 9.50mm x 5.50mm for the original). PCB layout verification is necessary to confirm mechanical fit within the available mounting space.

Both parts maintain ROHS3 compliance and MSL 1 rating. The substitute carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring this standard.

Frequently Asked Questions (FAQ)

Q: Can the 7447714471 be used as a direct replacement for SCR105B-471?

A: The 7447714471 is electrically compatible for most applications. The 30 mA reduction in current rating (600 mA vs. 630 mA) requires verification that circuit operating current does not exceed the substitute's specification. Physical dimensions differ slightly; PCB layout confirmation is necessary.

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

A: Lower DC resistance (1.1Ohm vs. 1.5Ohm) reduces resistive losses and heat generation. This is advantageous for thermal performance and efficiency, provided the circuit design does not depend on the original part's resistance characteristics.

Q: Are there packaging differences between these parts?

A: Both parts use nonstandard surface mount packages with similar footprints. The substitute measures 10.00mm x 10.00mm x 5.00mm compared to the original 10.50mm x 9.50mm x 5.50mm. Verify PCB layout accommodates the substitute's dimensions.

Q: Does the substitute meet automotive standards?

A: The 7447714471 carries AEC-Q200 qualification, suitable for automotive applications. The original SCR105B-471 does not specify this rating.

Q: What is the significance of the higher saturation current in the substitute?

A: The substitute's saturation current of 820 mA (versus 330 mA in the original) indicates greater core margin before saturation occurs. This provides additional design headroom for transient current conditions.

Q: Are both parts RoHS compliant?

A: Yes, both the SCR105B-471 and 7447714471 are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level).