SCRH74-330 Equivalent & Substitute Parts

Part Overview

The SCRH74-330 is a 33 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 960 mA continuous current with a maximum DC resistance of 170mOhm. This component operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently active in production with 839 pieces available in inventory.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting the same functional requirements and compliance standards.

Substiute Parts

SCRH74-330

Signal TransformerIn Stock: 917SCRH74-330 Datasheet

Current PartRFQ

SRR0745A-330M

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR0745A-330M qualifies as a direct substitute based on the following critical parameters:

• Inductance Match: Both parts specify 33 µH with ±20% tolerance at 1 kHz test frequency
• Shielding Configuration: Both are shielded inductors, maintaining electromagnetic isolation requirements
• Temperature Range Compatibility: Both operate across -40°C to 125°C
• Compliance Alignment: Both are ROHS3 compliant and REACH unaffected
• Mounting Compatibility: Both are surface mount components with nonstandard package classifications
• Current Capability: The substitute part (1.35 A / 1.45 A saturation) exceeds the main part requirement (960 mA), providing margin for application headroom
• DC Resistance: The substitute part (150mOhm max) is lower than the main part (170mOhm max), reducing power dissipation

Parameter Comparison

Engineering Selection Recommendations

Both the SCRH74-330 and SRR0745A-330M meet the core electrical and compliance requirements for 33 µH shielded inductor applications. The SRR0745A-330M is manufactured by Bourns Inc. and carries AEC-Q200 qualification, indicating automotive-grade reliability screening. Both parts maintain identical inductance values, tolerance specifications, and operating temperature ranges.

The substitute part provides improved performance margins with higher current ratings and lower DC resistance, making it suitable for applications requiring enhanced thermal performance or current headroom. Component selection should be based on availability, packaging format preference (Tape & Reel versus Cut Tape), and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-330M replace the SCRH74-330 in existing designs?

A: Yes. Both parts maintain 33 µH inductance at ±20% tolerance with identical test frequency (1 kHz), shielding configuration, and operating temperature range (-40°C to 125°C). The substitute part's higher current rating and lower DC resistance provide additional performance margin.

Q: What are the physical dimension differences?

A: The SCRH74-330 measures 0.307" L × 0.307" W × 0.177" H (7.80mm × 7.80mm × 4.50mm). The SRR0745A-330M measures 0.287" L × 0.287" W × 0.185" H (7.30mm × 7.30mm × 4.70mm). Both are nonstandard package classifications. PCB layout verification is required for physical fit confirmation.

Q: Are there compliance differences between the two parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. The SRR0745A-330M includes AEC-Q200 automotive qualification, which is an additional certification not specified for the main part.

Q: What packaging formats are available?

A: The SCRH74-330 is supplied in Tape & Reel (TR) format. The SRR0745A-330M is available in Cut Tape (CT) and Digi-Reel® formats. Packaging selection depends on assembly process requirements and volume specifications.

Q: How do the DC resistance values affect circuit performance?

A: The SRR0745A-330M has a maximum DC resistance of 150mOhm compared to 170mOhm for the SCRH74-330. This 20mOhm reduction decreases resistive losses and heat generation, particularly beneficial in high-current or thermally constrained applications.