SCRH105-4R7 Equivalent & Substitute Parts

Part Overview

The SCRH105-4R7 is a 4.7 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring fixed inductance in compact form factors. This component is rated for 4.21 A continuous current with a maximum DC resistance of 27mOhm and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

SCRH105-4R7

Signal TransformerIn Stock: 765SCRH105-4R7 Datasheet

Current PartRFQ

SD8350-4R7-R

Eaton - Electronics DivisionIn Stock: 1631SD8350-4R7-R Datasheet

MFR RecommendedRFQ

SRN8040-4R7Y

Bourns Inc.In Stock: 8291SRN8040-4R7Y Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCRH105-4R7 are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Inductance value: 4.7 µH (within ±30% tolerance specification)
• Current rating: Minimum 4.1 A (maintains operational margin below saturation)
• DC resistance: Maximum 27 mOhm (electrical performance equivalence)
• Operating temperature range: -40°C to 125°C (thermal compatibility)
• Mounting type: Surface Mount (assembly compatibility)
• Inductance test frequency: 100 kHz (measurement standard alignment)

Secondary Compatibility Factors:

• Shielding classification: Shielded or Semi-Shielded (electromagnetic containment)
• Package dimensions: Nonstandard form factor (physical fit within assembly constraints)
• RoHS and MSL compliance: ROHS3 Compliant, MSL 1 (regulatory and handling requirements)

The identified substitutes SD8350-4R7-R and SRN8040-4R7Y meet the primary electrical criteria while maintaining thermal and regulatory compliance. Mechanical dimensions vary within acceptable assembly tolerances for nonstandard packages.

Parameter Comparison

Engineering Selection Recommendations

SD8350-4R7-R (Eaton - Electronics Division): This substitute maintains full shielding classification matching the SCRH105-4R7 and provides superior DC resistance performance at 22 mOhm maximum. The part is RoHS compliant with Active product status. Physical dimensions are reduced (9.50 mm x 8.30 mm x 4.50 mm), which may require PCB layout verification for clearance compatibility. Current rating of 4.1 A and saturation current of 5.5 A remain within acceptable operational margins for applications designed for the main part.

SRN8040-4R7Y (Bourns Inc.): This substitute provides the lowest profile height at 4.00 mm maximum and smallest footprint at 8.00 mm x 8.00 mm, offering space optimization benefits. DC resistance of 24 mOhm maximum remains within specification. The part features Semi-Shielded classification rather than full shielding, which may affect electromagnetic performance in noise-sensitive applications. ROHS3 compliance and Active product status align with modern regulatory requirements. Saturation current of 4.7 A is lower than the main part, requiring current margin assessment for peak load conditions.

Selection between substitutes depends on application priorities: electromagnetic shielding requirements, available PCB space, and peak current handling capacity.

Frequently Asked Questions (FAQ)

Q: Can SD8350-4R7-R be used as a direct replacement for SCRH105-4R7?

A: SD8350-4R7-R qualifies as an electrical substitute based on matching inductance (4.7 µH), tolerance (±30%), current rating (4.1 A), and DC resistance (22 mOhm maximum). Both parts maintain identical operating temperature range (-40°C to 125°C) and shielding classification. Physical dimensions are smaller, requiring PCB layout verification to confirm mechanical fit within the assembly.

Q: What is the difference between shielded and semi-shielded inductors?

A: Shielded inductors (SCRH105-4R7 and SD8350-4R7-R) provide complete electromagnetic containment, reducing radiated emissions and susceptibility to external magnetic fields. Semi-shielded inductors (SRN8040-4R7Y) offer partial containment with reduced size and cost. Selection depends on circuit noise immunity requirements and EMI specifications.

Q: Is SRN8040-4R7Y suitable for applications requiring 4.21 A continuous current?

A: SRN8040-4R7Y is rated for 4.1 A continuous current, which is 0.11 A below the SCRH105-4R7 specification. For applications operating at or near 4.21 A, this substitute provides reduced current margin. Saturation current of 4.7 A also limits peak transient handling compared to the main part's 7 A rating. Application current profile must be evaluated before substitution.

Q: Are all three parts RoHS compliant?

A: SCRH105-4R7 and SRN8040-4R7Y are ROHS3 compliant. SD8350-4R7-R is RoHS compliant. Both compliance levels meet current regulatory requirements. All three parts have Moisture Sensitivity Level 1 (Unlimited), indicating no special handling or storage conditions are required.

Q: How do DC resistance differences affect circuit performance?

A: SCRH105-4R7 specifies 27 mOhm maximum DCR, while substitutes offer 22 mOhm (SD8350-4R7-R) and 24 mOhm (SRN8040-4R7Y). Lower DCR reduces resistive losses and heat generation. For applications sensitive to inductor losses, the lower DCR values of substitutes provide performance improvement. For applications with DCR-dependent current limiting or sensing, the 3-5 mOhm difference may require circuit analysis.

Q: What packaging differences exist between these parts?

A: All three parts use Tape & Reel or Cut Tape packaging for surface mount assembly. SCRH105-4R7 and SRN8040-4R7Y use Tape & Reel; SD8350-4R7-R uses Cut Tape & Digi-Reel. Footprint dimensions vary: SCRH105-4R7 (10.10 x 9.20 mm), SD8350-4R7-R (9.50 x 8.30 mm), and SRN8040-4R7Y (8.00 x 8.00 mm). Height differences range from 4.00 mm to 6.00 mm, affecting vertical clearance requirements.