SCRH64B-391 Equivalent & Substitute Parts

Part Overview

The SCRH64B-391 is a 390 µH shielded surface mount inductor rated for 220 mA with a maximum DC resistance of 2.94Ohm. Manufactured by Signal Transformer, this component is classified as obsolete. Due to its discontinued status, identifying equivalent substitute parts with matching electrical and mechanical specifications is essential for design continuity and procurement planning.

Substiute Parts

SCRH64B-391

Signal TransformerIn Stock: 1209SCRH64B-391 Datasheet

Current PartRFQ

SCPH73B-391

Signal TransformerIn Stock: 1017SCPH73B-391 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH64B-391 is determined by the following critical parameters:

• Inductance Value: Must be 390 µH with ±20% tolerance
• Shielding Type: Must be shielded construction
• Mounting Configuration: Must be surface mount
• Operating Temperature Range: Must support -40°C ~ 125°C
• Compliance Standards: Must maintain ROHS3 compliance and MSL 1 rating

The SCPH73B-391 qualifies as a substitute based on matching inductance, shielding, mounting type, temperature range, and compliance certifications. Current rating and DC resistance variations are within acceptable substitution parameters for this component category.

Parameter Comparison

Engineering Selection Recommendations

The SCPH73B-391 is the qualified substitute for the obsolete SCRH64B-391. Selection is supported by:

• Electrical Equivalence: Identical inductance value and tolerance specification
• Thermal Compatibility: Matching operating temperature range ensures thermal performance parity
• Regulatory Compliance: Both components maintain ROHS3 compliance and MSL 1 rating
• Active Product Status: The SCPH73B-391 is currently in active production, ensuring long-term availability and supply chain stability
• Enhanced Current Rating: The substitute provides 320 mA current rating versus 220 mA, offering improved headroom for circuit operation
• Dimensional Considerations: The substitute features a smaller seated height (3.80mm vs 5.20mm) and slightly larger footprint (7.50mm x 7.50mm vs 6.50mm x 6.40mm), requiring PCB layout verification

Frequently Asked Questions (FAQ)

Q: Can the SCPH73B-391 be used as a direct replacement for the SCRH64B-391?

A: Yes, the SCPH73B-391 meets the core electrical and compliance requirements for substitution. PCB layout must accommodate the dimensional differences: larger footprint and reduced height.

Q: What are the key differences between these parts?

A: The primary differences are current rating (320 mA vs 220 mA), DC resistance (3Ohm vs 2.94Ohm), and physical dimensions. The substitute offers higher current capacity and lower profile height.

Q: Are there any compliance concerns with using the substitute?

A: No. Both components are ROHS3 compliant with MSL 1 rating and identical operating temperature ranges.

Q: Does the higher current rating of the SCPH73B-391 affect circuit performance?

A: The higher current rating provides additional design margin. The inductance value and tolerance remain identical, ensuring equivalent circuit behavior at the specified 220 mA operating point.

Q: What should be verified before implementing the substitute?

A: PCB layout must be updated to accommodate the footprint change from 6.50mm x 6.40mm to 7.50mm x 7.50mm and the height reduction from 5.20mm to 3.80mm.