SCRH74B-330 Equivalent & Substitute Parts

Part Overview

The SCRH74B-330 is a 33 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 960 mA continuous current with a maximum DC resistance of 170 mOhm. This component is designed for applications requiring fixed inductance in compact form factors with electromagnetic shielding. The part maintains Active product status and is RoHS3 compliant, suitable for industrial and commercial electronic assemblies operating across the -40°C to 125°C temperature range. Substitute parts are identified to provide alternative sourcing options when the primary component becomes unavailable or when design requirements permit functional equivalents.

Substiute Parts

SCRH74B-330

Signal TransformerIn Stock: 1066SCRH74B-330 Datasheet

Current PartRFQ

SRR0745A-330M

Bourns Inc.In Stock: 950405SRR0745A-330M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH74B-330 is determined by the following critical parameters:

• Inductance Value: Must be 33 µH with ±20% tolerance
• Shielding Requirement: Must be shielded construction
• Mounting Configuration: Must be surface mount technology
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Current Handling Capability: Substitute must support minimum 960 mA continuous current rating
• DC Resistance: Lower or equal DCR values are acceptable; higher values require circuit validation
• Compliance Standards: RoHS3 compliance required; additional certifications (AEC-Q200) are permissible enhancements

The SRR0745A-330M from Bourns Inc. qualifies as a direct substitute based on matching inductance, shielding, mounting type, temperature range, and exceeding the current rating specification (1.35 A vs. 960 mA requirement).

Parameter Comparison

Engineering Selection Recommendations

The SRR0745A-330M is qualified as a substitute for the SCRH74B-330 based on the following factors:

• Both components maintain Active product status and ROHS3 compliance
• The SRR0745A-330M provides superior current handling (1.35 A vs. 960 mA), ensuring adequate margin in the application
• DC resistance of the substitute is lower (150 mOhm vs. 170 mOhm), resulting in reduced power dissipation
• Identical inductance value and tolerance ensure equivalent circuit performance at the specified 1 kHz test frequency
• The SRR0745A-330M carries AEC-Q200 qualification, providing additional reliability assurance for automotive and high-reliability applications
• Physical dimensions are comparable (7.30mm x 7.30mm vs. 7.80mm x 7.80mm), with height differences within typical PCB layout tolerances

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-330M be used as a direct replacement for the SCRH74B-330?

A: Yes. Both components share identical inductance values, tolerance specifications, shielding characteristics, and operating temperature ranges. The substitute exceeds the current rating requirement and provides lower DC resistance, making it functionally compatible for the specified application.

Q: What are the physical dimension differences between these parts?

A: The SCRH74B-330 measures 7.80mm x 7.80mm with a maximum seated height of 4.50mm. The SRR0745A-330M measures 7.30mm x 7.30mm with a maximum seated height of 4.70mm. These differences are within standard PCB layout tolerances and do not typically require design modifications.

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

A: Lower DC resistance reduces power dissipation and heat generation in the inductor. This is a beneficial characteristic that does not negatively impact circuit performance. The inductance value and tolerance remain identical, ensuring equivalent electrical behavior.

Q: Are there packaging differences between these parts?

A: The SCRH74B-330 is supplied in Tape & Reel (TR) packaging, while the SRR0745A-330M is available in Cut Tape (CT) and Digi-Reel® packaging. Packaging selection depends on assembly process requirements and volume considerations.

Q: What compliance certifications apply to each part?

A: Both components are ROHS3 compliant and REACH unaffected. The SRR0745A-330M additionally carries AEC-Q200 qualification, which is relevant for automotive and high-reliability applications but does not restrict use in other markets.

Q: Is the higher current rating of the substitute a concern?

A: No. A higher current rating provides additional design margin and does not create compatibility issues. The component will operate safely at the original 960 mA specification with improved reliability characteristics.