SD3812-151-R Equivalent & Substitute Parts

Part Overview

The SD3812-151-R is a 150 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 178 mA continuous current with a DC resistance of 6.13 Ohm 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 production continuity.

Substiute Parts

SD3812-151-R

Eaton - Electronics DivisionIn Stock: 1217SD3812-151-R Datasheet

Current PartRFQ

TYS4018151M-10

Laird-Signal Integrity ProductsIn Stock: 999TYS4018151M-10 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD3812-151-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 150 µH (tolerance range acceptable within design margins)
• Shielding requirement: Shielded configuration
• Mounting type: Surface mount
• Physical footprint: 4.00mm x 4.00mm base dimensions

Secondary Compatibility Factors:

• Current rating: Substitute must support minimum 178 mA continuous operation
• Saturation current: Substitute must accommodate peak current demands
• DC resistance: Lower DCR values improve efficiency but must not introduce unintended circuit behavior
• Operating temperature: Substitute must cover or exceed -40°C to 85°C range
• Moisture sensitivity: MSL 1 rating ensures compatibility with standard assembly processes

The TYS4018151M-10 from Laird-Signal Integrity Products meets these substitution criteria through matching inductance, shielding, mounting type, and physical footprint, while offering improved current handling and lower DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TYS4018151M-10

The TYS4018151M-10 is the direct substitute for the obsolete SD3812-151-R. Selection is based on the following engineering factors:

1. Product Status: The SD3812-151-R is obsolete. The TYS4018151M-10 is active and currently manufactured, ensuring long-term availability and supply chain continuity.

2. Electrical Compatibility: Both components share identical inductance values (150 µH) and test frequencies (100 kHz). The Laird substitute provides superior current handling (220 mA vs. 178 mA) and saturation performance (310 mA vs. 202 mA), eliminating current-related design constraints.

3. Physical Compatibility: Base footprint dimensions are identical (4.00mm x 4.00mm). Height difference (2.00mm vs. 1.20mm) requires verification of PCB clearance and assembly constraints.

4. Compliance and Certifications: The TYS4018151M-10 carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. Both components maintain MSL 1 rating for standard assembly processes.

5. DC Resistance Consideration: The Laird substitute exhibits significantly lower DC resistance (2.5 Ohm max vs. 6.13 Ohm). This reduction improves efficiency but may alter circuit behavior in applications where the original DCR value was intentional. Circuit validation is required for designs dependent on specific resistance characteristics.

6. Temperature Range: The Laird component extends the upper operating limit to 125°C, providing additional thermal margin beyond the original -40°C to 85°C specification.

Frequently Asked Questions (FAQ)

Q: Can the TYS4018151M-10 directly replace the SD3812-151-R without circuit modification?

A: Direct substitution is viable for most applications. Both components share identical inductance values, test frequencies, shielding, and physical footprints. However, the significantly lower DC resistance of the Laird component (2.5 Ohm vs. 6.13 Ohm) may affect circuit performance in applications where resistance characteristics influence circuit behavior. Circuit validation is required.

Q: What is the impact of the 0.80mm height difference between these components?

A: The TYS4018151M-10 has a maximum seated height of 2.00mm compared to 1.20mm for the SD3812-151-R. This 0.80mm difference must be verified against PCB layout constraints, component clearance requirements, and assembly equipment specifications. Height compatibility should be confirmed before design release.

Q: Are there packaging differences between these parts?

A: The SD3812-151-R packaging is listed as nonstandard with no supplier device package specified. The TYS4018151M-10 is supplied in Tape & Reel (TR) format, which is standard for surface mount production. This difference may affect procurement and assembly processes.

Q: Why is the inductance tolerance wider for the Laird component?

A: The TYS4018151M-10 carries ±20% tolerance compared to ±15% for the Eaton part. This wider tolerance is acceptable for most circuit applications. Applications requiring tighter inductance control should evaluate whether the tolerance range remains within acceptable circuit performance margins.

Q: Does the lower DC resistance of the TYS4018151M-10 present any design concerns?

A: Lower DC resistance reduces power dissipation and improves efficiency. However, in circuits where the original component's resistance value was intentional (such as current limiting or impedance matching applications), the lower resistance may alter circuit behavior. Circuit analysis is required to confirm compatibility.

Q: What compliance advantages does the TYS4018151M-10 offer?

A: The Laird component is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The obsolete SD3812-151-R does not carry these certifications. For new designs or products subject to environmental regulations, the TYS4018151M-10 is the appropriate selection.

Q: Is the extended temperature range of the TYS4018151M-10 beneficial?

A: The Laird component operates to 125°C compared to 85°C for the Eaton part. This extended range provides additional thermal margin and may be advantageous for applications in elevated temperature environments. However, it does not restrict use in applications requiring only the original -40°C to 85°C range.