SCRH74-180 Equivalent & Substitute Parts

Part Overview

The SCRH74-180 is a 18 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring fixed inductance with moderate current handling. This component is rated for 1.31 A continuous current with a maximum DC resistance of 91 mOhm and operates across the industrial temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant.

Substitute components become necessary when primary inventory is unavailable, when design requirements permit higher current ratings, or when alternative manufacturers offer equivalent electrical performance with improved availability or cost structure.

Substiute Parts

SCRH74-180

Signal TransformerIn Stock: 724SCRH74-180 Datasheet

Current PartRFQ

SRR0745A-180M

Bourns Inc.In Stock: 6650SRR0745A-180M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR0745A-180M qualifies as a direct substitute for the SCRH74-180 based on the following critical parameters:

Matching Electrical Specifications:

• Inductance value: 18 µH (identical)
• Inductance tolerance: ±20% (identical)
• Operating temperature range: -40°C to 125°C (identical)
• Shielding: Shielded (identical)
• Inductance test frequency: 1 kHz (identical)

Compatible Mechanical Specifications:

• Mounting type: Surface Mount (identical)
• Package type: Nonstandard (identical)
• Moisture sensitivity level: 1 (Unlimited) (identical)

Enhanced Performance Characteristics:

• Current rating: 1.8 A (exceeds 1.31 A requirement)
• DC resistance: 90 mOhm Max (meets 91 mOhm specification)
• Saturation current: 1.95 A (exceeds 1.31 A requirement)

The SRR0745A-180M maintains all critical electrical and mechanical compatibility while providing superior current handling capacity, making it suitable for applications where the SCRH74-180 is unavailable.

Parameter Comparison

Engineering Selection Recommendations

Both the SCRH74-180 and SRR0745A-180M maintain Active product status, ensuring continued manufacturer support and availability. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

The SRR0745A-180M is qualified to AEC-Q200 automotive standards, providing additional reliability assurance for applications requiring automotive-grade components. This qualification does not restrict use in non-automotive applications.

Selection between these parts should be based on availability, cost structure, and whether the enhanced current rating of the SRR0745A-180M provides design margin benefits for the specific application. Both parts satisfy the electrical and mechanical requirements defined by the 18 µH inductance specification and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-180M replace the SCRH74-180 in existing designs?

A: Yes. The SRR0745A-180M maintains identical inductance value, tolerance, operating temperature range, shielding, and mounting type. The higher current rating and lower DC resistance represent performance improvements compatible with the original specification.

Q: What is the significance of the higher current rating on the SRR0745A-180M?

A: The SRR0745A-180M is rated for 1.8 A continuous current versus 1.31 A on the SCRH74-180. This provides additional thermal margin and allows operation in applications with higher current demands while maintaining the same inductance value.

Q: Are there physical dimension differences between these parts?

A: Yes. The SCRH74-180 measures 0.307" L x 0.307" W x 0.177" H (7.80mm x 7.80mm x 4.50mm), while the SRR0745A-180M measures 0.287" L x 0.287" W x 0.185" H (7.30mm x 7.30mm x 4.70mm). Both are classified as Nonstandard package types. PCB layout verification is required before substitution.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity). The SRR0745A-180M carries additional AEC-Q200 automotive qualification.

Q: What is the DC resistance difference between these inductors?

A: The SCRH74-180 specifies 91 mOhm maximum DC resistance, while the SRR0745A-180M specifies 90 mOhm maximum. This 1 mOhm difference is negligible for most applications and represents equivalent performance.