SCRH64B-390 Equivalent & Substitute Parts

Part Overview

The SCRH64B-390 is a 39 µH shielded inductor manufactured by Signal Transformer, rated for 690 mA with a maximum DC resistance of 370 mOhm. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The part is surface-mounted in a nonstandard package and operates across the temperature range of -40°C to 125°C.

Substiute Parts

SCRH64B-390

Signal TransformerIn Stock: 751SCRH64B-390 Datasheet

Current PartRFQ

CDRH5D28RNP-390NC

Sumida America Components Inc.In Stock: 1068CDRH5D28RNP-390NC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH64B-390 is based on the following critical parameters:

• Inductance Value: 39 µH (primary functional requirement)
• Current Rating: Minimum 680 mA (substitute must support circuit current demands)
• Shielding: Shielded construction (electromagnetic interference control)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• DC Resistance: Lower DCR values improve efficiency; substitute DCR of 209.5 mOhm is acceptable
• Operating Temperature: Substitute range of -40°C to 100°C covers the lower end of the original specification
• RoHS Compliance: ROHS3 compliance maintained across both parts

The CDRH5D28RNP-390NC from Sumida America Components Inc. meets these substitution criteria with compatible inductance, adequate current rating, shielded construction, and surface-mount packaging.

Parameter Comparison

Engineering Selection Recommendations

The CDRH5D28RNP-390NC qualifies as a direct substitute based on the following factors:

• Product Status: The substitute is active and currently available, addressing the obsolescence of the original part
• Functional Equivalence: Both parts provide 39 µH inductance with shielded construction and surface-mount compatibility
• Current Capacity: The substitute's 680 mA rating is within 1.4% of the original 690 mA specification
• DC Resistance Advantage: The substitute exhibits lower DCR (209.5 mOhm vs. 370 mOhm), resulting in reduced power dissipation
• Compliance: Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating
• Temperature Consideration: The substitute operates to 100°C versus the original 125°C maximum. Applications requiring operation above 100°C require thermal analysis

Frequently Asked Questions (FAQ)

Q: Can the CDRH5D28RNP-390NC be used as a direct replacement for the SCRH64B-390?

A: Yes, the CDRH5D28RNP-390NC meets the core electrical and mechanical requirements for substitution. Both parts provide 39 µH inductance, shielded construction, and surface-mount packaging. The substitute's lower DC resistance provides improved efficiency.

Q: What is the impact of the 10 mA current rating difference?

A: The substitute is rated for 680 mA versus the original 690 mA. This 1.4% difference is negligible for most applications. Verify that circuit peak and continuous current demands do not exceed 680 mA.

Q: Does the wider inductance tolerance of the substitute affect circuit performance?

A: The substitute has ±30% tolerance versus the original ±20%. For applications sensitive to inductance variation, measure the actual inductance value of the substitute part to confirm it falls within acceptable circuit operating parameters.

Q: Is the reduced operating temperature range a concern?

A: The substitute operates to 100°C maximum versus the original 125°C. For applications requiring sustained operation above 100°C, thermal analysis of the substitute part in the specific circuit environment is necessary to confirm suitability.

Q: Are there packaging or footprint differences?

A: Both parts use nonstandard surface-mount packages. Physical dimensions differ slightly: the original is 6.50mm × 6.40mm × 5.20mm (max height), while the substitute is 6.00mm × 5.90mm × 3.00mm (max height). Verify PCB layout compatibility before assembly.