SD3114-331-R Equivalent & Substitute Parts

Part Overview

The SD3114-331-R is a 330 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This component is rated for 113 mA continuous current with a DC resistance of 11.78 Ohm and operates across the temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of suitable equivalent components essential for ongoing design support and production continuity.

The shielded drum core construction provides electromagnetic isolation in compact surface mount applications. Due to its obsolete status, alternative parts with compatible electrical and mechanical specifications are required for new procurement and design revisions.

Substiute Parts

SD3114-331-R

Eaton - Electronics DivisionIn Stock: 1104SD3114-331-R Datasheet

Current PartRFQ

1812R-334K

API Delevan Inc.In Stock: 11461812R-334K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD3114-331-R is based on the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 330 µH (tolerance range acceptable within ±20%)
• Ferrite core material composition
• Surface mount technology compatibility
• Operating temperature range minimum of -40°C to 125°C
• Compact form factor (3.10 x 3.10 mm footprint or equivalent)

Secondary Compatibility Factors:

• Current rating: minimum 113 mA continuous
• DC resistance: acceptable range up to 14 Ohm maximum
• Saturation current: minimum 139 mA
• Moisture sensitivity level: MSL 1 (Unlimited)

The substitute part 1812R-334K from API Delevan Inc. meets the primary inductance, core material, and temperature specifications. Variations in shielding configuration, DC resistance tolerance, and package designation reflect active product alternatives available in the current market.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SD3114-331-R is classified as obsolete. The 1812R-334K from API Delevan Inc. is an active product with current manufacturing support and documented availability. Selection of the active substitute ensures long-term supply chain reliability and technical support access.

Compliance and Certification: The 1812R-334K carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Both parts are classified under ECCN EAR99 for export control purposes.

Electrical Performance: The substitute part meets or exceeds the primary electrical specifications: 330 µH inductance, 120 mA current rating (exceeding the 113 mA requirement), and ferrite core construction. DC resistance of 14 Ohm maximum is within acceptable operational limits compared to the original 11.78 Ohm specification.

Physical Form Factor: The substitute part measures 3.20 x 3.20 x 4.83 mm, representing a 0.10 mm increase in length and width and a 3.43 mm increase in height compared to the original 3.10 x 3.10 x 1.40 mm footprint. PCB layout verification is required to confirm clearance compatibility.

Shielding Configuration: The original SD3114-331-R features shielding; the 1812R-334K is unshielded. Circuit design review is necessary to determine whether electromagnetic isolation is functionally required or whether unshielded operation is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can the 1812R-334K directly replace the SD3114-331-R without circuit modification?

A: Electrical substitution is feasible based on matching inductance (330 µH), core material (ferrite), and current ratings. However, two design considerations require evaluation: the substitute is unshielded versus the original shielded design, and the physical height increases from 1.40 mm to 4.83 mm. PCB layout and electromagnetic compatibility assessment is mandatory before implementation.

Q: What is the significance of the inductance tolerance difference (±20% vs ±10%)?

A: The substitute part 1812R-334K offers tighter inductance tolerance (±10%) compared to the original SD3114-331-R (±20%). This represents improved manufacturing precision and may provide better circuit performance consistency. Applications with strict inductance requirements benefit from this tighter specification.

Q: Does the higher DC resistance of the substitute (14 Ohm max vs 11.78 Ohm) affect circuit performance?

A: The DC resistance increase of approximately 2.22 Ohm represents a 18.8% rise. In applications where inductor losses directly impact efficiency or thermal performance, this difference requires calculation. For low-power signal conditioning circuits, the impact is typically negligible. For power delivery applications, thermal analysis is recommended.

Q: Why is the substitute part larger in height (4.83 mm vs 1.40 mm)?

A: The 1812R-334K uses a 2-SMD package configuration, which inherently requires greater vertical clearance for component leads and solder connections. The original SD3114-331-R uses a nonstandard drum core package optimized for minimal height. PCB design must accommodate this dimensional change through layout revision or component repositioning.

Q: Is the unshielded configuration of the 1812R-334K acceptable for my application?

A: Shielding provides electromagnetic isolation, reducing radiated emissions and susceptibility to external magnetic fields. Unshielded inductors are suitable for applications where magnetic field coupling is not a design constraint. Circuit board layout, component spacing, and system-level EMI testing determine acceptability. Applications in high-frequency switching supplies or sensitive analog circuits may require shielded alternatives.

Q: What is the impact of the extended temperature range (-55°C to 125°C vs -40°C to 125°C)?

A: The substitute part supports operation at -55°C, extending the lower temperature limit by 15°C. This provides additional margin for applications in extreme cold environments or cryogenic equipment. For standard industrial applications operating above -40°C, this specification difference has no functional impact.

Q: Are there any supply chain advantages to selecting the 1812R-334K?

A: The 1812R-334K is an active product from API Delevan Inc. with documented current manufacturing. The original SD3114-331-R is obsolete with no ongoing production. Active product status ensures availability, technical documentation access, and manufacturer support for future design revisions or production scaling.