SCR74B-101 Equivalent & Substitute Parts

Part Overview

The SCR74B-101 is a 100 µH shielded inductor manufactured by Signal Transformer, rated for 1.14 A continuous current with a maximum DC resistance of 490mOhm. This component is designed for surface mount applications in nonstandard packaging. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Substiute Parts

SCR74B-101

Signal TransformerIn Stock: 924SCR74B-101 Datasheet

Current PartRFQ

ASPI-8040S-101M-T

Abracon LLCIn Stock: 123102ASPI-8040S-101M-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASPI-8040S-101M-T qualifies as a direct substitute for the SCR74B-101 based on the following critical parameters:

• Inductance Value: Both parts specify 100 µH with ±20% tolerance
• Current Rating: The substitute provides 1 A continuous current, which is within the operational envelope of the original 1.14 A specification
• DC Resistance: The substitute's 290mOhm DCR is lower than the original 490mOhm maximum, providing improved efficiency
• Shielding: Both parts are shielded inductors, maintaining electromagnetic isolation requirements
• Operating Temperature: Identical range of -40°C ~ 125°C
• Surface Mount Configuration: Both use surface mount technology for PCB integration
• Regulatory Compliance: Both are ROHS3 compliant and REACH unaffected

Parameter Comparison

Engineering Selection Recommendations

The ASPI-8040S-101M-T is the qualified substitute for the obsolete SCR74B-101. Selection is based on:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain stability
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and safety standards
• Electrical Equivalence: Matching inductance value, tolerance, and operating temperature range ensure functional compatibility in existing circuit designs
• Performance Improvement: The substitute offers lower DC resistance (290mOhm vs 490mOhm), resulting in reduced power dissipation and improved thermal performance
• Availability: The substitute has substantial inventory (123,057 pcs) compared to the obsolete original part (872 pcs remaining)

Frequently Asked Questions (FAQ)

Q: Can the ASPI-8040S-101M-T directly replace the SCR74B-101 in existing designs?

A: Yes. Both parts share identical inductance values (100 µH), tolerance (±20%), operating temperature range (-40°C ~ 125°C), and shielding characteristics. The substitute's 1 A current rating is suitable for applications designed for the original 1.14 A specification.

Q: What is the impact of the lower DC resistance in the substitute part?

A: The ASPI-8040S-101M-T has 290mOhm DCR compared to the original 490mOhm maximum. This represents improved efficiency with reduced resistive losses and lower heat generation during operation.

Q: Are there packaging differences between these parts?

A: The original SCR74B-101 uses nonstandard packaging, while the ASPI-8040S-101M-T is supplied in standard Tape & Reel (TR) format. Physical dimensions are similar (8.30mm x 7.50mm vs 8.00mm x 8.00mm), with the substitute being slightly more compact in height (4.20mm vs 5.00mm).

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the SCR74B-101 and ASPI-8040S-101M-T are ROHS3 compliant and REACH unaffected, meeting current environmental and safety standards.

Q: What is the saturation current difference, and does it matter?

A: The original part has 550mA saturation current, while the substitute has 1.15A. The substitute's higher saturation current provides additional margin and is not a limiting factor for substitution.