SCRH74B-820 Equivalent & Substitute Parts

Part Overview

The SCRH74B-820 is a 82 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 610 mA continuous current with a maximum DC resistance of 430mOhm. This component is designed for applications requiring fixed inductance in compact nonstandard packages. The part is active in production and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory availability, lead time constraints, or specific application performance requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

SCRH74B-820

Signal TransformerIn Stock: 1034SCRH74B-820 Datasheet

Current PartRFQ

SRR0745A-820M

Bourns Inc.In Stock: 1926SRR0745A-820M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH74B-820 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 82 µH (within ±20% tolerance specification)
• Inductance tolerance: ±20%
• Shielding: Shielded construction required
• Mounting type: Surface Mount
• Operating temperature range: -40°C ~ 125°C minimum
• Inductance test frequency: 1 kHz

Allowable Variation Parameters:

• Current rating: Must equal or exceed 610 mA continuous rating
• Saturation current (Isat): Must equal or exceed 610 mA
• DC resistance (DCR): Must not exceed 430mOhm maximum
• Physical dimensions: Nonstandard package with height not exceeding 0.177" (4.50mm) seated maximum
• Compliance: ROHS3 compliant, REACH unaffected

The SRR0745A-820M from Bourns Inc. meets all substitution criteria with improved electrical performance characteristics within the allowed parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

The SRR0745A-820M is a qualified substitute for the SCRH74B-820 based on the following engineering criteria:

Electrical Performance: The substitute part meets or exceeds all critical electrical specifications. The 82 µH inductance value is identical with matching ±20% tolerance. Current rating of 780 mA exceeds the 610 mA requirement, and saturation current of 900 mA provides additional margin. DC resistance of 400 mOhm is superior to the 430 mOhm maximum specification.

Mechanical Compatibility: Both parts are surface mount inductors in nonstandard packages. The substitute has slightly reduced footprint dimensions (7.30mm vs 7.80mm) and marginally increased height (4.70mm vs 4.50mm), remaining within acceptable assembly tolerances for nonstandard package designs.

Compliance and Certification: Both parts are ROHS3 compliant and REACH unaffected. The substitute carries AEC-Q200 automotive qualification, indicating additional reliability validation. Both parts operate across the identical -40°C to 125°C temperature range with MSL 1 (unlimited moisture sensitivity).

Product Status: Both parts are active in production with confirmed inventory availability, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-820M be used as a direct replacement for the SCRH74B-820?

A: Yes. The SRR0745A-820M meets all critical electrical and mechanical parameters required for substitution. Inductance value, tolerance, shielding, mounting type, and operating temperature range are identical. Current rating and saturation current exceed requirements, and DC resistance is superior. Physical dimensions are compatible with nonstandard package assembly requirements.

Q: What are the key differences between these two inductors?

A: The primary differences are manufacturer (Signal Transformer vs Bourns Inc.), current handling capability (610 mA vs 780 mA continuous), saturation current (610 mA vs 900 mA), DC resistance (430 mOhm vs 400 mOhm), footprint dimensions (7.80mm vs 7.30mm), and height (4.50mm vs 4.70mm). The substitute provides improved electrical performance with lower resistance and higher current margins.

Q: Are there any package or footprint compatibility concerns?

A: The substitute has a smaller footprint (7.30mm square vs 7.80mm square) and slightly greater height (4.70mm vs 4.50mm). Both are nonstandard packages. PCB layout verification is necessary to confirm that the reduced footprint and increased height do not conflict with existing design constraints or adjacent component placement.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SCRH74B-820 and SRR0745A-820M are ROHS3 compliant, REACH unaffected, and rated for -40°C to 125°C operation with MSL 1. The substitute additionally carries AEC-Q200 automotive qualification.

Q: What is the inductance tolerance specification?

A: Both parts specify ±20% inductance tolerance, measured at 1 kHz. This tolerance applies to the 82 µH nominal value, resulting in an acceptable range of 65.6 µH to 98.4 µH.

Q: Can the substitute handle the same current levels as the original part?

A: The substitute exceeds the original part's current handling. The SCRH74B-820 is rated for 610 mA continuous current with 610 mA saturation current. The SRR0745A-820M is rated for 780 mA continuous current with 900 mA saturation current, providing additional margin for transient conditions.