SD3812-470-R Equivalent & Substitute Parts

Part Overview

The SD3812-470-R is a 47 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 327 mA continuous current with a DC resistance of 1.809 Ohm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

SD3812-470-R

Eaton - Electronics DivisionIn Stock: 885SD3812-470-R Datasheet

Current PartRFQ

SRR3011-470YL

Bourns Inc.In Stock: 2846SRR3011-470YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD3812-470-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 47 µH (exact match required)
• Core material and shielding: Ferrite, shielded drum core configuration
• Mounting technology: Surface mount
• Physical form factor: Nonstandard drum core package

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 327 mA continuous operation
• DC resistance: Substitute DCR must not exceed design limits significantly
• Operating temperature: Substitute must cover or exceed -40°C to 85°C range
• Saturation current: Substitute Isat must accommodate circuit peak current demands

The SRR3011-470YL from Bourns Inc. meets the primary matching criteria with identical inductance value, ferrite shielded drum core construction, and surface mount configuration. Secondary parameter analysis determines suitability for specific circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SRR3011-470YL is a functional equivalent for the obsolete SD3812-470-R based on matching inductance value, core construction, and surface mount configuration. The substitute is actively manufactured and carries ROHS3 compliance certification, supporting modern supply chain and regulatory requirements.

Application-Specific Considerations:

Circuits designed for the SD3812-470-R operating at or near 327 mA continuous current require evaluation of the SRR3011-470YL's 270 mA rating. The 57 mA reduction in current capacity may necessitate thermal or current distribution analysis in high-current applications. The Bourns substitute exhibits lower saturation current (230 mA versus 361 mA), which impacts peak current handling capability.

The SRR3011-470YL's extended operating temperature range (-40°C to 125°C) provides additional thermal margin compared to the original specification (-40°C to 85°C). The tighter inductance tolerance of the Eaton part (±15% versus ±30%) should be considered in precision filter or resonant circuit applications.

Physical Integration:

The SRR3011-470YL footprint is marginally smaller in length and width (3.80mm versus 4.00mm) but slightly taller (1.30mm versus 1.20mm). PCB layout verification is required to confirm mechanical compatibility, particularly in height-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the SRR3011-470YL directly replace the SD3812-470-R in all applications?

A: Direct replacement is possible for applications operating below 270 mA continuous current. Circuits designed for the full 327 mA rating of the original part require current derating analysis or alternative component selection. The lower saturation current of the Bourns part (230 mA) must be verified against peak current demands in the circuit.

Q: What is the impact of the inductance tolerance difference?

A: The SD3812-470-R specifies ±15% tolerance while the SRR3011-470YL specifies ±30%. In applications where inductance accuracy is critical (precision filters, resonant circuits, impedance matching networks), the wider tolerance of the substitute may introduce unacceptable performance variation. Circuit simulation or tolerance stack analysis is necessary to determine acceptability.

Q: Are there physical compatibility issues with PCB layout?

A: The SRR3011-470YL has a slightly smaller footprint (3.80mm x 3.80mm versus 4.00mm x 4.00mm) but is 0.10mm taller. Most PCB designs accommodate this variation without modification. However, applications with height constraints or tight component spacing require physical verification before implementation.

Q: What compliance advantages does the SRR3011-470YL offer?

A: The Bourns substitute carries ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements. The obsolete Eaton part does not specify these certifications, making the Bourns alternative preferable for new designs and long-term supply continuity.

Q: How do the DC resistance values compare?

A: The SD3812-470-R specifies 1.809 Ohm while the SRR3011-470YL specifies 1.8 Ohm maximum. These values are effectively equivalent for most applications. Power dissipation calculations should account for the maximum specified resistance of the substitute to ensure thermal design margins remain adequate.

Q: What is the significance of the saturation current difference?

A: The SD3812-470-R saturates at 361 mA while the SRR3011-470YL saturates at 230 mA. In applications experiencing transient current spikes or fault conditions, the lower saturation point of the substitute may cause inductance collapse at lower peak currents. Circuit protection and current limiting schemes must be evaluated accordingly.