SCR74B-151 Equivalent & Substitute Parts

Part Overview

The SCR74B-151 is a 150 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 970 mA and maximum DC resistance of 940mOhm. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SCR74B-151

Signal TransformerIn Stock: 1151SCR74B-151 Datasheet

Current PartRFQ

74404086151

Würth ElektronikIn Stock: 445774404086151 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCR74B-151 is determined by the following critical parameters:

Inductance value must match at 150 µH with ±20% tolerance specification. Current rating of the substitute must meet or exceed 970 mA to ensure safe operation within the original circuit design. DC resistance must not exceed 940mOhm to maintain equivalent power dissipation characteristics. Operating temperature range must span -40°C to 125°C minimum. Surface mount packaging and ROHS3 compliance are mandatory for manufacturing and regulatory compatibility.

The Würth Elektronik 74404086151 qualifies as a direct substitute based on these parameters: it provides 150 µH inductance with ±20% tolerance, supports 1.2 A current rating (exceeding the 970 mA requirement), maintains 355mOhm DC resistance (lower than the 940mOhm maximum), operates across -40°C to 125°C, and maintains ROHS3 compliance. The semi-shielded construction and ferrite drum core design provide equivalent electromagnetic performance within the specified tolerance band.

Parameter Comparison

Engineering Selection Recommendations

The SCR74B-151 is obsolete and no longer in active production. The Würth Elektronik 74404086151 is the qualified substitute, offering active product status with continued manufacturing support and availability. Both components meet ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility across markets.

The substitute part exceeds the original specifications in current rating capacity (1.2 A versus 970 mA) and provides superior DC resistance performance (355mOhm versus 940mOhm maximum). These improvements enhance thermal efficiency and current handling capability. The semi-shielded construction of the substitute maintains electromagnetic containment suitable for the original application context while providing ferrite core stability across the full operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 74404086151 directly replace the SCR74B-151 in existing designs?

A: Yes. Both components provide identical 150 µH inductance with ±20% tolerance, operate across -40°C to 125°C, and maintain surface mount compatibility. The substitute's higher current rating (1.2 A) and lower DC resistance (355mOhm) represent performance improvements over the original specification.

Q: What is the difference between shielded and semi-shielded construction?

A: Shielded inductors use complete electromagnetic containment, while semi-shielded designs employ partial shielding. Both configurations contain magnetic fields sufficiently for standard circuit applications. The semi-shielded approach of the substitute maintains performance within the ±20% inductance tolerance band.

Q: Are there packaging differences between these parts?

A: Both components use nonstandard surface mount packages with similar footprints (SCR74B-151: 8.30mm x 7.50mm; 74404086151: 8.00mm x 8.00mm). Physical dimensions are comparable, supporting direct PCB layout compatibility.

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

A: Lower DC resistance reduces power dissipation and heat generation, which is beneficial. This does not negatively impact circuit function and improves thermal performance within the same inductance and tolerance specifications.

Q: What compliance certifications apply to both parts?

A: Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for industrial and commercial applications.