SCRH104-390 Equivalent & Substitute Parts

Part Overview

The SCRH104-390 is a 39 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 1.59 A and maximum DC resistance of 170mOhm. This component is classified as obsolete, making substitute parts 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

SCRH104-390

Signal TransformerIn Stock: 1157SCRH104-390 Datasheet

Current PartRFQ

SRR1050A-390Y

Bourns Inc.In Stock: 1406SRR1050A-390Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCRH104-390 is based on the following critical parameters that must remain compatible:

• Inductance value: 39 µH (tolerance variance acceptable within design margins)
• Shielding requirement: Shielded construction mandatory
• Mounting configuration: Surface mount only
• Operating temperature range: -40°C to 125°C minimum
• Physical footprint: Nonstandard package with dimensions approximately 10mm x 9mm x 5mm
• Current handling capability: Minimum 1.59 A rating required
• DC resistance: Lower DCR values improve performance and reduce losses
• Compliance standards: ROHS3 and REACH requirements

The SRR1050A-390Y from Bourns Inc. qualifies as a direct substitute based on these parameters. It maintains the 39 µH inductance specification, shielded construction, surface mount configuration, and identical operating temperature range. The substitute offers improved electrical characteristics with higher current rating (2.25 A vs 1.59 A) and lower DC resistance (106 mOhm vs 170 mOhm), while maintaining compatible physical dimensions and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SRR1050A-390Y is the qualified substitute for the obsolete SCRH104-390. Selection is justified on the following engineering basis:

The main part has reached obsolete status, necessitating alternative sourcing for continued production and new designs. The SRR1050A-390Y maintains active product status with established supply chain availability, ensuring long-term component procurement reliability.

Both components meet identical compliance requirements: ROHS3 compliance and REACH unaffected status. Both operate across the full industrial temperature range of -40°C to 125°C with MSL 1 moisture sensitivity rating, indicating unlimited shelf life under standard storage conditions.

The substitute part provides superior electrical performance characteristics. The increased current rating (2.25 A vs 1.59 A) and higher saturation current (2.3 A vs 1.2 A) offer design margin improvements. The reduced DC resistance (106 mOhm vs 170 mOhm) decreases power dissipation and thermal effects in the application circuit.

Physical dimensions are compatible within manufacturing tolerances. The substitute dimensions (10.20mm x 10.00mm x 5.10mm) represent minimal variation from the original (10.10mm x 9.20mm x 5.00mm), suitable for existing PCB layouts designed for nonstandard packages.

Frequently Asked Questions (FAQ)

Q: Can the SRR1050A-390Y directly replace the SCRH104-390 in existing designs?

A: Yes. Both components maintain 39 µH inductance at 100 kHz test frequency, identical shielding, surface mount configuration, and compatible physical dimensions. The substitute operates across the same temperature range and meets equivalent compliance standards.

Q: What are the key differences between these parts?

A: The SRR1050A-390Y offers improved electrical performance with 41% higher current rating (2.25 A vs 1.59 A), 92% higher saturation current (2.3 A vs 1.2 A), and 38% lower DC resistance (106 mOhm vs 170 mOhm). Inductance tolerance is wider (±30% vs ±20%), and the substitute features a ferrite drum core wirewound construction versus unspecified core material in the original.

Q: Are there packaging considerations for this substitution?

A: The original SCRH104-390 uses nonstandard packaging, while the SRR1050A-390Y is supplied in Tape & Reel (TR) format. Both maintain compatible physical footprints for PCB placement. Verify tape specifications and reel compatibility with your assembly equipment if automated handling is required.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SCRH104-390 and SRR1050A-390Y are ROHS3 compliant and REACH unaffected. Both carry MSL 1 moisture sensitivity rating with unlimited shelf life under standard storage conditions.

Q: What is the inductance tolerance difference impact?

A: The SCRH104-390 specifies ±20% tolerance while the SRR1050A-390Y specifies ±30%. For a 39 µH nominal value, this represents a tolerance band of ±7.8 µH versus ±11.7 µH respectively. Circuit designs must accommodate the wider tolerance range of the substitute part.

Q: Is the lower DC resistance of the substitute part beneficial?

A: Yes. The 106 mOhm maximum DCR of the SRR1050A-390Y compared to 170 mOhm of the original reduces resistive losses by approximately 38%. This decreases power dissipation, thermal generation, and improves overall circuit efficiency in current-carrying applications.