SCRH74-390 Equivalent & Substitute Parts

Part Overview

The SCRH74-390 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 designed for applications requiring fixed inductance in compact nonstandard packages with operating temperatures from -40°C to 125°C. The part maintains Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

SCRH74-390

Signal TransformerIn Stock: 732SCRH74-390 Datasheet

Current PartRFQ

SRR0745A-390M

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH74-390 is determined by the following critical parameters:

• Inductance Value: Must be 39 µH with ±20% tolerance
• Current Rating: Substitute must support minimum 910 mA continuous current
• DC Resistance: Substitute DCR must not exceed 230 mOhm to maintain circuit performance
• Shielding: Shielded construction required
• Mounting Type: Surface mount configuration mandatory
• Operating Temperature: Must support -40°C to 125°C range
• Package Compatibility: Nonstandard package with physical dimensions and height constraints

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

Parameter Comparison

Engineering Selection Recommendations

The SRR0745A-390M qualifies as a direct substitute for the SCRH74-390 based on the following factors:

• Both components maintain Active product status with full regulatory compliance (ROHS3, REACH Unaffected)
• The SRR0745A-390M carries AEC-Q200 qualification, indicating automotive-grade reliability
• Electrical parameters are equivalent or superior: identical inductance and tolerance, higher current rating, and lower DC resistance
• Physical compatibility is maintained within nonstandard package constraints, with the substitute featuring a smaller footprint (7.30mm vs 7.80mm) and marginally increased height (4.70mm vs 4.50mm)
• Both components support identical operating temperature range and moisture sensitivity classification

Selection between these parts should be based on PCB layout constraints, availability, and cost considerations, as electrical performance is equivalent or favors the substitute.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-390M replace the SCRH74-390 in existing designs?

A: Yes. Both inductors provide 39 µH inductance with ±20% tolerance at 1 kHz test frequency. The SRR0745A-390M supports higher current (1.17 A vs 910 mA) and exhibits lower DC resistance (190 mOhm vs 230 mOhm), making it electrically compatible and superior for current handling.

Q: What are the physical differences between these parts?

A: The SRR0745A-390M has a smaller footprint (7.30mm x 7.30mm vs 7.80mm x 7.80mm) but is slightly taller when seated (4.70mm vs 4.50mm). PCB layout must accommodate these dimensional changes.

Q: Are both parts compliant with automotive standards?

A: The SCRH74-390 is ROHS3 compliant. The SRR0745A-390M is ROHS3 compliant and additionally carries AEC-Q200 qualification for automotive applications.

Q: What determines substitution eligibility for 39 µH shielded inductors?

A: Substitution requires matching inductance value (39 µH ±20%), equivalent or superior current rating (minimum 910 mA), DC resistance not exceeding 230 mOhm, shielded construction, surface mount configuration, and -40°C to 125°C operating temperature support.

Q: How does DC resistance affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. The SRR0745A-390M's 190 mOhm maximum resistance is superior to the SCRH74-390's 230 mOhm maximum, resulting in improved efficiency in current-carrying applications.