SDH3812-1R5-R Equivalent & Substitute Parts

Part Overview

The SDH3812-1R5-R is a 1.5 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.67 A continuous current with a maximum DC resistance of 83 mOhm and operates across the temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Inductance	1.5 µH
Current Rating	1.67 A
DC Resistance (DCR)	83 mOhm Max
Core Type	Ferrite Drum Core, Shielded
Mounting Type	Surface Mount
Package Dimensions	0.150" L x 0.150" W x 0.047" H (3.80mm x 3.80mm x 1.20mm)
Operating Temperature	-40°C to 125°C
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SDH3812-1R5-R is based on the following critical parameters that must align across candidate parts:

Primary Matching Criteria:

Inductance value: 1.5 µH (exact match required)
Core material and shielding: Ferrite, shielded drum core configuration
Mounting type: Surface mount
Package footprint: 0.150" L x 0.150" W (3.80mm x 3.80mm)
Operating temperature range: -40°C to 125°C minimum

Secondary Compatibility Factors:

Current rating: Substitute must support minimum 1.67 A
DC resistance: Lower or equivalent values are acceptable
Saturation current: Must exceed application requirements

The SRR3011-1R5YL from Bourns Inc. meets these substitution criteria with matching inductance, core type, shielding, footprint dimensions, and operating temperature range.

Parameter Comparison

Parameter	SDH3812-1R5-R (Eaton)	SRR3011-1R5YL (Bourns)	Compatibility
Inductance	1.5 µH	1.5 µH	Match
Inductance Tolerance	±20%	±30%	Bourns tolerance wider
Current Rating (Amps)	1.67 A	1.6 A	Bourns rated 0.07 A lower
Current - Saturation (Isat)	2.3 A	1.3 A	Eaton rated higher
DC Resistance (DCR)	83 mOhm Max	55 mOhm Max	Bourns lower (improved)
Core Type	Ferrite Drum Core, Shielded	Ferrite Drum Core, Shielded	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Dimensions	0.150" L x 0.150" W (3.80mm x 3.80mm)	0.150" L x 0.150" W (3.80mm x 3.80mm)	Match
Height - Seated (Max)	0.047" (1.20mm)	0.051" (1.30mm)	Bourns 0.004" taller
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Match
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Match
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Not specified	ROHS3 Compliant	Bourns compliant

Engineering Selection Recommendations

The SRR3011-1R5YL from Bourns Inc. is a suitable substitute for the obsolete SDH3812-1R5-R based on the following engineering factors:

Electrical Compatibility: The SRR3011-1R5YL maintains the same 1.5 µH inductance value and ferrite shielded drum core construction. The DC resistance of 55 mOhm is lower than the 83 mOhm maximum of the original part, resulting in reduced power dissipation. The current rating of 1.6 A is marginally lower than the 1.67 A rating of the SDH3812-1R5-R; applications operating at or near the maximum current specification of the original part require evaluation to confirm the 0.07 A difference does not impact performance.

Physical Compatibility: Both parts share identical footprint dimensions of 0.150" x 0.150" (3.80mm x 3.80mm), enabling direct PCB layout compatibility. The SRR3011-1R5YL seated height of 0.051" (1.30mm) exceeds the original 0.047" (1.20mm) by 0.004", which is within typical PCB assembly tolerances for surface mount components.

Compliance and Availability: The SRR3011-1R5YL is an active product with ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory alignment. The original SDH3812-1R5-R is obsolete, making the Bourns substitute the appropriate choice for new procurement and design continuity.

Frequently Asked Questions (FAQ)

Q: Can the SRR3011-1R5YL directly replace the SDH3812-1R5-R on existing PCBs?

A: Yes, the SRR3011-1R5YL has identical footprint dimensions (0.150" x 0.150") and can be placed in the same PCB pad pattern. The seated height difference of 0.004" is within standard surface mount assembly tolerances and does not require PCB redesign.

Q: What is the impact of the lower current rating on the SRR3011-1R5YL?

A: The SRR3011-1R5YL is rated for 1.6 A continuous current compared to 1.67 A for the SDH3812-1R5-R. Applications operating below 1.6 A experience no impact. Circuits designed to operate at or above 1.6 A require verification that the 0.07 A difference does not exceed application requirements.

Q: How does the lower DC resistance of the SRR3011-1R5YL affect circuit performance?

A: The SRR3011-1R5YL exhibits 55 mOhm maximum DC resistance versus 83 mOhm for the original part. Lower DC resistance reduces resistive losses and heat generation, which is a beneficial characteristic in most applications. No circuit redesign is required.

Q: Are there packaging differences between these parts?

A: The SDH3812-1R5-R packaging is listed as nonstandard. The SRR3011-1R5YL is supplied in Tape & Reel (TR) packaging. Both parts are surface mount components with identical footprints. Tape & Reel packaging is standard for automated assembly processes.

Q: What is the inductance tolerance difference between these parts?

A: The SDH3812-1R5-R has ±20% inductance tolerance, while the SRR3011-1R5YL has ±30% tolerance. Applications with tight inductance specifications should account for the wider tolerance band of the substitute part during circuit analysis.

Q: Is the SRR3011-1R5YL compliant with current regulatory standards?

A: Yes, the SRR3011-1R5YL is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original SDH3812-1R5-R compliance status is not specified.

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