SCR74B-220 Equivalent & Substitute Parts

Part Overview

The SCR74B-220 is a 22 µH shielded inductor manufactured by Signal Transformer, rated for 2.18 A with a maximum DC resistance of 130mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is packaged in a nonstandard surface mount configuration.

Substiute Parts

SCR74B-220

Signal TransformerIn Stock: 847SCR74B-220 Datasheet

Current PartRFQ

74404084220

Würth ElektronikIn Stock: 162174404084220 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Würth Elektronik 74404084220 qualifies as a functional substitute for the SCR74B-220 based on the following critical parameters:

• Inductance Value: Both parts specify 22 µH with ±20% tolerance, ensuring equivalent inductive performance
• Current Rating: The substitute provides 2.1 A, which is within 96% of the original 2.18 A specification
• DC Resistance: The substitute's 69 mOhm DCR is lower than the original 130 mOhm maximum, providing improved efficiency
• Shielding: Both parts are shielded inductors, maintaining electromagnetic isolation requirements
• Operating Temperature: Both operate across -40°C to 125°C, supporting identical thermal specifications
• Surface Mount Configuration: Both use surface mount technology with comparable physical footprints (8.00mm × 8.00mm vs. 8.30mm × 7.50mm)
• Compliance: Both are ROHS3 compliant and REACH unaffected

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 74404084220 is the qualified substitute for the obsolete SCR74B-220. Selection is supported by:

• Active Product Status: The substitute is currently in active production, ensuring long-term availability and supply chain stability
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements
• AEC-Q200 Certification: The substitute carries AEC-Q200 automotive-grade qualification, providing additional reliability assurance
• Electrical Equivalence: Matching inductance values, tolerance specifications, and operating temperature ranges ensure functional compatibility in circuit applications
• Improved Performance Characteristics: The substitute offers lower DC resistance (69 mOhm vs. 130 mOhm) and higher saturation current (2.6 A vs. 1.12 A), delivering enhanced efficiency and thermal performance

Frequently Asked Questions (FAQ)

Q: Can the 74404084220 be used as a direct replacement for the SCR74B-220?

A: Yes. Both parts meet the critical electrical specifications: 22 µH inductance, ±20% tolerance, shielded configuration, and -40°C to 125°C operating range. The substitute's lower DCR and higher saturation current represent performance improvements.

Q: What are the physical compatibility considerations?

A: The substitute (8.00mm × 8.00mm × 4.20mm) is slightly smaller than the original (8.30mm × 7.50mm × 5.00mm). PCB layout verification is required to confirm footprint compatibility, though the dimensional difference is minimal for most surface mount applications.

Q: How do the current ratings compare?

A: The substitute provides 2.1 A versus the original 2.18 A. This 96% rating represents a negligible difference for most applications. The substitute's higher saturation current (2.6 A vs. 1.12 A) indicates superior current handling capability.

Q: Are there compliance differences between the parts?

A: Both parts are ROHS3 compliant and REACH unaffected. The substitute additionally carries AEC-Q200 automotive-grade certification, indicating enhanced reliability qualification.

Q: What is the packaging difference?

A: The original part uses nonstandard packaging. The substitute is supplied in Tape & Reel (TR) format with an 8040 supplier device package designation, facilitating automated assembly processes.