SD3812-1R0-R Equivalent & Substitute Parts

Part Overview

The SD3812-1R0-R is a 1 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 2 A continuous current with 48 mOhm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity. The part operates across the industrial temperature range of -40°C to 85°C and is suitable for surface mount applications in compact form factors.

Substiute Parts

SD3812-1R0-R

Eaton - Electronics DivisionIn Stock: 895SD3812-1R0-R Datasheet

Current PartRFQ

TYS40181R0N-10

Laird-Signal Integrity ProductsIn Stock: 65195TYS40181R0N-10 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD3812-1R0-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 1 µH (measured at 100 kHz)
• Current rating: minimum 2 A continuous
• Shielding: shielded construction required
• Mounting: surface mount, nonstandard package
• Physical footprint: 4.00 mm × 4.00 mm base dimensions

Secondary Compatibility Factors:

• DC resistance: substitute must not exceed application thermal and efficiency requirements
• Saturation current: must equal or exceed 2 A operating point
• Temperature range: must cover or exceed -40°C to 85°C minimum
• Moisture sensitivity: MSL 1 (unlimited) acceptable

The TYS40181R0N-10 from Laird-Signal Integrity Products meets these criteria with identical inductance, current rating, shielding, and footprint dimensions. Variations in DCR, tolerance, and saturation current are within acceptable engineering margins for this component category.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TYS40181R0N-10

The TYS40181R0N-10 is the qualified equivalent for SD3812-1R0-R replacement. Selection is based on the following engineering factors:

Functional Compatibility:

• Identical inductance value and test frequency ensure circuit performance equivalence
• Matching 2 A current rating maintains design operating point
• Shielded construction preserves electromagnetic isolation properties
• Identical 4.00 mm × 4.00 mm footprint ensures PCB layout compatibility

Compliance & Availability:

• Active product status ensures long-term supply chain continuity
• ROHS3 compliance meets current environmental and regulatory requirements
• REACH unaffected status confirms material compliance
• Significantly higher inventory (65,151 pcs vs. 832 pcs) provides procurement reliability

Performance Advantages:

• Lower DC resistance (25 mOhm max vs. 48 mOhm) reduces I²R losses and thermal dissipation
• Higher saturation current (4.8 A vs. 2.69 A) provides additional design margin
• Extended operating temperature range (-40 to 125°C vs. -40 to 85°C) supports broader application environments

Design Considerations:

• Height difference (2.00 mm vs. 1.20 mm) requires verification of vertical PCB clearance and component stacking constraints
• Wider inductance tolerance (±30% vs. ±15%) may require circuit validation if tight tolerance is critical to application performance
• Tape & Reel packaging (TR) differs from original; confirm compatibility with assembly processes

Frequently Asked Questions (FAQ)

Q: Can TYS40181R0N-10 be used as a direct drop-in replacement for SD3812-1R0-R?

A: Yes, for most applications. Both parts share identical inductance (1 µH), current rating (2 A), shielding, and footprint (4.00 × 4.00 mm). The primary design consideration is the 0.80 mm height difference (2.00 mm vs. 1.20 mm). Verify that the increased height does not violate PCB clearance requirements, component stacking limits, or enclosure constraints in your specific assembly.

Q: What are the implications of the different DC resistance values?

A: The TYS40181R0N-10 has lower DC resistance (25 mOhm max vs. 48 mOhm). This is advantageous, reducing resistive losses and heat generation. For a 2 A load, the original part dissipates approximately 192 mW (I²R = 4 × 0.048), while the substitute dissipates approximately 100 mW (I²R = 4 × 0.025). This improvement enhances thermal performance and efficiency.

Q: Does the wider inductance tolerance of the substitute affect circuit performance?

A: The TYS40181R0N-10 has ±30% tolerance compared to the original ±15%. If your circuit design depends on tight inductance tolerance for frequency response, filtering characteristics, or impedance matching, validate the substitute through circuit simulation or prototype testing. For general-purpose filtering and energy storage applications, the wider tolerance is typically acceptable.

Q: Are there any compliance or certification differences?

A: The TYS40181R0N-10 is ROHS3 compliant and REACH unaffected, meeting current environmental standards. The original SD3812-1R0-R compliance status is not specified. Both parts carry EAR99 ECCN classification and identical HTSUS codes (8504.50.4000). If your application requires specific environmental certifications, the substitute's ROHS3 status is advantageous.

Q: What is the significance of the higher saturation current in the substitute?

A: The TYS40181R0N-10 has a saturation current of 4.8 A compared to 2.69 A in the original. This provides additional design margin and reduces the risk of core saturation under transient current spikes or fault conditions. For a 2 A rated application, the substitute offers approximately 79% additional saturation headroom.

Q: How do the self-resonant frequency specifications compare?

A: The TYS40181R0N-10 specifies a self-resonant frequency of 80 MHz. The original part does not provide this specification. Self-resonant frequency defines the upper frequency limit before the inductor transitions to capacitive behavior. For applications operating below 80 MHz, this specification confirms the substitute's suitability. If your circuit operates near or above this frequency, validate performance through measurement.

Q: What packaging differences exist, and how do they affect procurement?

A: The original part packaging is not specified. The substitute is supplied in Tape & Reel (TR) format, which is standard for automated assembly. Confirm that your assembly process supports TR packaging. If manual or alternative assembly methods are required, contact the supplier regarding alternative packaging options.

Q: Can both parts be used interchangeably in existing inventory?

A: No. The SD3812-1R0-R is obsolete with limited inventory (832 pcs). The TYS40181R0N-10 is actively manufactured with significantly higher availability (65,151 pcs). For new designs and ongoing production, transition to the TYS40181R0N-10. For legacy systems requiring the original part, establish a transition plan to redesign or qualify the substitute.