SCRH104-391 Equivalent & Substitute Parts

Part Overview

The SCRH104-391 is a 390 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 490 mA continuous current with a maximum DC resistance of 1.55Ohm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance standards.

Substiute Parts

SCRH104-391

Signal TransformerIn Stock: 763SCRH104-391 Datasheet

Current PartRFQ

CDRH105RNP-391NC

Sumida America Components Inc.In Stock: 1166CDRH105RNP-391NC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CDRH105RNP-391NC from Sumida America Components Inc. qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Inductance value: 390 µH (identical)
• Inductance test frequency: 100 kHz (identical)
• Shielding classification: Shielded (identical)
• Mounting type: Surface Mount (identical)
• RoHS3 compliance: Confirmed
• Moisture Sensitivity Level: 1 (Unlimited) - identical

Allowable Variations:

• Current rating: 700 mA (substitute) vs. 490 mA (original) — higher rating provides margin
• DC resistance: 953 mOhm (substitute) vs. 1.55Ohm (original) — lower resistance is acceptable
• Inductance tolerance: ±30% (substitute) vs. ±20% (original) — wider tolerance is acceptable for equivalent functionality
• Operating temperature: -40°C to 100°C (substitute) vs. -40°C to 125°C (original) — lower maximum temperature requires circuit validation
• Core material: Ferrite (substitute) — specified for substitute; original core material not provided
• Package status: Active (substitute) vs. Obsolete (original) — ensures ongoing availability

Parameter Comparison

Engineering Selection Recommendations

The CDRH105RNP-391NC is suitable as a substitute for the obsolete SCRH104-391 in applications where the operating temperature maximum of 100°C is acceptable. The substitute provides superior electrical performance with lower DC resistance (953 mOhm vs. 1.55Ohm) and higher current rating (700 mA vs. 490 mA), reducing thermal stress in the circuit. Both components maintain identical inductance values at the test frequency and meet ROHS3 compliance requirements.

The wider inductance tolerance of the substitute (±30% vs. ±20%) must be evaluated against circuit design margins. Applications requiring the full 125°C operating temperature of the original part require alternative solutions outside this substitute group.

The substitute's active product status ensures long-term availability and supply chain continuity compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the CDRH105RNP-391NC replace the SCRH104-391 in all applications?

A: The substitute is compatible for applications operating at or below 100°C. Circuits requiring operation above 100°C must use alternative components, as the substitute's maximum operating temperature is 100°C versus the original's 125°C.

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

A: The substitute's DC resistance of 953 mOhm is lower than the original's 1.55Ohm maximum. This reduces resistive losses and heat generation, which is beneficial for most applications. Circuit designs relying on the original's higher resistance for current limiting or thermal characteristics require re-evaluation.

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

A: The substitute's ±30% tolerance is wider than the original's ±20%. Applications with tight inductance requirements must verify that the substitute's tolerance range remains within acceptable circuit performance margins.

Q: Are both components pin-compatible?

A: Both components are surface mount inductors with identical inductance values and shielding. Physical dimensions differ slightly (original: 10.10mm × 9.20mm × 5.00mm; substitute: 10.20mm × 10.00mm × 5.10mm). PCB layout verification is required to confirm mechanical fit.

Q: What is the difference in packaging between these parts?

A: The original part uses nonstandard packaging, while the substitute is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes and provides better supply chain availability.

Q: Are both parts RoHS compliant?

A: Yes, both the SCRH104-391 and CDRH105RNP-391NC are ROHS3 compliant and meet environmental regulatory requirements.