SD3812-1R5-R Equivalent & Substitute Parts

Part Overview

The SD3812-1R5-R is a 1.5 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.58 A continuous current with a DC resistance of 78 mOhm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

SD3812-1R5-R

Eaton - Electronics DivisionIn Stock: 1176SD3812-1R5-R Datasheet

Current PartRFQ

SRR3011-1R5YL

Bourns Inc.In Stock: 1066SRR3011-1R5YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD3812-1R5-R is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 1.5 µH (exact match required)
• Core material and shielding: Ferrite, shielded drum core configuration
• Mounting technology: Surface mount
• Current rating: Minimum 1.58 A continuous
• DC resistance: Comparable performance (lower DCR preferred for reduced losses)
• Package footprint: Compatible with 4.00 mm × 4.00 mm mounting area
• Temperature range: Support for -40°C minimum operating temperature

The SRR3011-1R5YL from Bourns Inc. meets these substitution criteria with equivalent inductance, shielded ferrite drum core construction, and surface mount configuration. The substitute part demonstrates improved DC resistance (55 mOhm maximum versus 78 mOhm) and higher current rating (1.6 A versus 1.58 A), providing enhanced performance characteristics within the same physical footprint class.

Parameter Comparison

Engineering Selection Recommendations

The SRR3011-1R5YL is a qualified substitute for the obsolete SD3812-1R5-R based on the following engineering factors:

Electrical Compatibility: Both components provide 1.5 µH inductance with ferrite shielded drum core construction. The substitute part meets or exceeds the current rating requirement (1.6 A versus 1.58 A) and delivers superior DC resistance performance (55 mOhm maximum versus 78 mOhm), resulting in reduced power dissipation in the application circuit.

Mechanical Compatibility: Surface mount configuration and MSL 1 moisture sensitivity rating are identical. Package footprint dimensions are comparable, with the substitute part measuring 3.80 mm × 3.80 mm versus 4.00 mm × 4.00 mm. Height difference of 0.10 mm (1.30 mm versus 1.20 mm maximum) is within typical PCB assembly tolerances for surface mount components.

Product Status and Compliance: The SRR3011-1R5YL is actively manufactured by Bourns Inc., ensuring long-term availability and supply chain continuity. The substitute part carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Temperature Range Consideration: The substitute part supports extended maximum operating temperature (125°C versus 85°C). Applications operating at or near the upper temperature limit of the original part may benefit from this extended thermal capability.

Frequently Asked Questions (FAQ)

Q: Can the SRR3011-1R5YL directly replace the SD3812-1R5-R in existing designs?

A: The SRR3011-1R5YL is electrically and mechanically compatible for direct substitution in applications where the 1.5 µH inductance value and surface mount configuration are required. The substitute part's improved DC resistance and higher current rating provide equivalent or superior performance. PCB layout verification is recommended to confirm compatibility with the slightly smaller footprint (3.80 mm × 3.80 mm versus 4.00 mm × 4.00 mm).

Q: What is the significance of the DC resistance difference between these parts?

A: The SD3812-1R5-R has 78 mOhm DC resistance, while the SRR3011-1R5YL has 55 mOhm maximum. Lower DC resistance reduces resistive losses and heat generation during operation. For applications with continuous current near the 1.58 A rating, the substitute part's lower resistance results in measurably reduced power dissipation.

Q: How do the saturation current ratings affect substitution?

A: The SD3812-1R5-R has saturation current (Isat) of 2.06 A, while the SRR3011-1R5YL has 1.3 A. Saturation current defines the point at which inductance begins to degrade under high current stress. Applications requiring current transients or peaks above 1.3 A should verify that the substitute part's saturation rating remains adequate for the specific circuit behavior.

Q: Are there packaging differences that affect procurement?

A: The SD3812-1R5-R is listed with standard packaging notation, while the SRR3011-1R5YL is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume surface mount assembly and is compatible with automated pick-and-place equipment. Minimum order quantities may differ between suppliers.

Q: Does the inductance tolerance difference impact circuit performance?

A: The SD3812-1R5-R has ±15% tolerance, while the SRR3011-1R5YL has ±30% tolerance. The main part offers tighter tolerance control. Applications requiring precise inductance values should evaluate whether the wider tolerance of the substitute part remains acceptable for the circuit's frequency response and filtering characteristics.

Q: What is the operating temperature consideration for this substitution?

A: Both parts support -40°C minimum operating temperature. The SD3812-1R5-R operates to 85°C maximum, while the SRR3011-1R5YL extends to 125°C. For applications operating within the 85°C limit, both parts are equivalent. Applications requiring operation above 85°C benefit from the substitute part's extended thermal range.