SD3814-221-R Equivalent & Substitute Parts

Part Overview

The SD3814-221-R is a 220 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 170 mA continuous current with a DC resistance of 5.48 Ohm and operates across the temperature range of -40°C to 85°C. The part carries an obsolete product status, making identification of suitable equivalent components essential for ongoing design support and procurement planning.

Substiute Parts

SD3814-221-R

Eaton - Electronics DivisionIn Stock: 3885SD3814-221-R Datasheet

Current PartRFQ

SD14-221-R

Eaton - Electronics DivisionIn Stock: 1010SD14-221-R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD3814-221-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 220 µH (exact match required)
• Core material: Ferrite shielded drum core
• Mounting type: Surface Mount
• Test frequency: 100 kHz
• Operating temperature range: -40°C to 85°C

Secondary Compatibility Factors:

• Current rating must equal or exceed the application requirement
• DC resistance must be compatible with circuit design specifications
• Saturation current must support the intended operating point
• Physical dimensions must accommodate PCB layout constraints

The SD14-221-R qualifies as a substitute based on matching inductance, core type, shielding, mounting configuration, and operating temperature range. However, differences in current rating, DC resistance, tolerance, and physical dimensions require circuit-level verification before implementation.

Parameter Comparison

Engineering Selection Recommendations

SD14-221-R as Primary Substitute:

The SD14-221-R is the designated equivalent for the obsolete SD3814-221-R based on matching inductance specification, ferrite core construction, shielded configuration, and identical operating temperature range. The substitute part is currently in active production status with RoHS compliance certification, supporting long-term supply chain continuity.

Electrical Performance Considerations:

The SD14-221-R provides higher current capacity (258 mA versus 170 mA) and lower DC resistance (3.77 Ohm versus 5.48 Ohm). These characteristics represent improved electrical performance within the same inductance class. Applications operating at or below 170 mA will experience reduced power dissipation with the substitute part.

Physical Footprint Impact:

The substitute part requires a larger PCB footprint (5.20 mm × 5.20 mm versus 4.00 mm × 4.00 mm). Height difference is negligible (1.45 mm versus 1.40 mm). PCB layout redesign may be necessary for space-constrained applications.

Tolerance and Compliance:

The SD14-221-R carries a ±20% inductance tolerance compared to ±15% for the original part. Circuits requiring tighter inductance tolerance specifications must account for this variance. The substitute part meets RoHS compliance requirements, supporting regulatory requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can the SD14-221-R directly replace the SD3814-221-R without circuit modification?

A: The SD14-221-R matches the critical inductance and core specifications. However, the larger physical dimensions (5.20 mm × 5.20 mm versus 4.00 mm × 4.00 mm) require PCB layout verification. The lower DC resistance (3.77 Ohm versus 5.48 Ohm) reduces power dissipation, which is generally beneficial but must be confirmed against circuit design specifications.

Q: What is the impact of the ±20% tolerance on the SD14-221-R compared to ±15% on the SD3814-221-R?

A: The wider tolerance band on the substitute part introduces greater inductance variation across the production range. Applications with inductance-critical functions must evaluate whether the ±20% tolerance remains within acceptable circuit performance margins.

Q: Are there packaging differences between these parts?

A: The SD14-221-R is supplied in Tape & Reel (TR) packaging, supporting automated assembly processes. The original SD3814-221-R packaging format is not specified in available documentation. Confirm packaging compatibility with assembly equipment and procurement workflows.

Q: Does the higher current rating of the SD14-221-R affect compatibility?

A: The increased current rating (258 mA versus 170 mA) and saturation current (249 mA versus 181 mA) represent enhanced performance margins. Applications operating within the original 170 mA specification will function within the substitute part's rated parameters with improved thermal performance.

Q: Is RoHS compliance a factor in selecting the SD14-221-R?

A: The SD14-221-R carries RoHS compliance certification. The original SD3814-221-R RoHS status is not specified. For applications subject to RoHS regulatory requirements, the substitute part provides documented compliance support.

Q: What is the significance of the obsolete status for the SD3814-221-R?

A: Obsolete status indicates the original part is no longer manufactured. The SD14-221-R active production status ensures ongoing availability for new procurement and design support activities.