SCR74B-270 Equivalent & Substitute Parts

Part Overview

The SCR74B-270 is a 27 µH shielded inductor manufactured by Signal Transformer, rated for 1.96 A with a maximum DC resistance of 160mOhm. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across the industrial temperature range of -40°C to 125°C and is packaged in a nonstandard surface mount configuration compliant with ROHS3 and REACH standards.

Substiute Parts

SCR74B-270

Signal TransformerIn Stock: 804SCR74B-270 Datasheet

Current PartRFQ

ASPI-8040S-270M-T

Abracon LLCIn Stock: 2787ASPI-8040S-270M-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR74B-270 is determined by the following critical parameters:

• Inductance Value: Must be 27 µH with ±20% tolerance
• Current Rating: Substitute must support minimum 1.96 A continuous current
• Saturation Current: Substitute saturation current must exceed or equal the application requirement
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Shielding: Shielded configuration required for EMI containment
• Temperature Range: Must support -40°C to 125°C operation
• Mounting Type: Surface mount configuration required
• Compliance: ROHS3 and REACH compliance mandatory

The ASPI-8040S-270M-T from Abracon LLC meets all substitution criteria with improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ASPI-8040S-270M-T is a direct functional substitute for the obsolete SCR74B-270. Both components maintain identical inductance values and tolerance specifications. The substitute part demonstrates superior electrical performance with a 2 A current rating versus 1.96 A, a saturation current of 2.15 A compared to 1.06 A, and reduced DC resistance of 78mOhm versus 160mOhm maximum.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements. The substitute is manufactured by Abracon LLC and carries active product status, ensuring long-term availability and supply chain continuity. The ASPI-8040S-270M-T is supplied in Tape & Reel packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ASPI-8040S-270M-T directly replace the SCR74B-270 in existing designs?

A: Yes. Both inductors share identical inductance values (27 µH), tolerance specifications (±20%), operating temperature ranges (-40°C to 125°C), and shielded surface mount configurations. The substitute meets or exceeds all electrical ratings of the original part.

Q: What are the physical dimension differences between these parts?

A: The SCR74B-270 measures 0.327" L x 0.295" W x 0.197" H (8.30mm x 7.50mm x 5.00mm). The ASPI-8040S-270M-T measures 0.315" L x 0.315" W x 0.165" H (8.00mm x 8.00mm x 4.20mm). Both are nonstandard packages; PCB layout verification is required for mechanical fit confirmation.

Q: Does the lower DC resistance of the substitute affect circuit operation?

A: Lower DC resistance (78mOhm versus 160mOhm) reduces power dissipation and heat generation, which is beneficial for circuit performance. This represents an improvement over the original specification.

Q: Are there packaging differences between the main part and substitute?

A: The SCR74B-270 inventory status is listed as new original stock. The ASPI-8040S-270M-T is supplied in Tape & Reel packaging, standard for automated assembly. Both are surface mount components suitable for pick-and-place equipment.

Q: What compliance certifications apply to both parts?

A: Both the SCR74B-270 and ASPI-8040S-270M-T are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.