SCRH74B-390 Equivalent & Substitute Parts

Part Overview

The SCRH74B-390 is a 39 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 910 mA continuous current with a maximum DC resistance of 230 mOhm. This component is classified as Active product status and is RoHS3 compliant. Equivalent parts are identified when applications require alternative sourcing due to inventory constraints, supply chain considerations, or when design specifications permit operation within the allowable parameter ranges for this inductance value and current rating category.

Substiute Parts

SCRH74B-390

Signal TransformerIn Stock: 758SCRH74B-390 Datasheet

Current PartRFQ

SRR0745A-390M

Bourns Inc.In Stock: 6927SRR0745A-390M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH74B-390 is determined by the following critical parameters:

• Inductance Value: Must be 39 µH with ±20% tolerance
• Current Rating: Minimum 910 mA continuous current capability
• DC Resistance: Maximum 230 mOhm to maintain circuit performance
• Shielding: Must be shielded to prevent electromagnetic interference
• Mounting Type: Surface mount configuration required
• Operating Temperature: Must support -40°C to 125°C range
• Compliance: RoHS3 compliance required

The SRR0745A-390M from Bourns Inc. meets all substitution criteria with equivalent inductance, superior current rating (1.17 A), lower DC resistance (190 mOhm), and identical operating temperature range and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SRR0745A-390M qualifies as a direct substitute for the SCRH74B-390 based on the following engineering criteria:

• Both components maintain identical inductance value and tolerance at the 1 kHz test frequency
• The substitute part exceeds the minimum current rating requirement (1.17 A vs. 910 mA), providing additional design margin
• DC resistance of the substitute is lower (190 mOhm vs. 230 mOhm), resulting in reduced power dissipation
• Both parts are shielded surface mount inductors with identical operating temperature specifications
• Both components carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings
• The substitute part carries AEC-Q200 automotive qualification, providing additional reliability assurance

Selection between these parts should be based on availability, cost considerations, and any application-specific requirements beyond the electrical and mechanical parameters specified.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-390M replace the SCRH74B-390 in my circuit?

A: Yes. Both inductors have identical 39 µH inductance values with ±20% tolerance and operate across the same -40°C to 125°C temperature range. The substitute part has higher current rating (1.17 A vs. 910 mA) and lower DC resistance (190 mOhm vs. 230 mOhm), making it electrically compatible and functionally superior for this application.

Q: Are there physical package differences between these parts?

A: Both parts are surface mount shielded inductors in nonstandard packages. The SCRH74B-390 measures 7.80mm × 7.80mm × 4.50mm (height seated max), while the SRR0745A-390M measures 7.30mm × 7.30mm × 4.70mm (height seated max). Verify PCB layout and component placement clearances before substitution.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the SCRH74B-390 and SRR0745A-390M are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited) for moisture sensitivity. The substitute part additionally carries AEC-Q200 automotive qualification.

Q: What is the inductance tolerance for these parts?

A: Both inductors are specified with ±20% inductance tolerance, measured at 1 kHz. This tolerance must be considered in circuit design calculations.

Q: Which part has lower power dissipation?

A: The SRR0745A-390M has lower DC resistance (190 mOhm maximum vs. 230 mOhm maximum), resulting in lower I²R power dissipation at equivalent current levels.