LD2-391-R Equivalent & Substitute Parts Reference

Part Overview

The LD2-391-R is a 390 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 780 mA continuous current with a maximum DC resistance of 1.77 Ohm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and carries an MSL rating of 1 (Unlimited), indicating robust moisture tolerance for standard storage and handling conditions. As an active product with current inventory availability, the LD2-391-R serves applications requiring fixed inductance in compact surface mount packages. Equivalent and substitute parts are identified based on matching inductance value, core material, shielding configuration, and compatible operating parameters.

Substiute Parts

LD2-391-R

Eaton - Electronics DivisionIn Stock: 817LD2-391-R Datasheet

Current PartRFQ

SDR0805-391KL

Bourns Inc.In Stock: 5262SDR0805-391KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LD2-391-R are identified based on strict alignment of electrical and mechanical parameters. The primary substitution criterion is inductance value: all equivalent parts must provide 390 µH inductance. Secondary criteria include core material (ferrite), shielding configuration (unshielded), and mounting type (surface mount). Current rating, DC resistance, and saturation current are evaluated to ensure the substitute part operates within the application's electrical requirements. Operating temperature range and RoHS compliance status are verified to confirm suitability for the target application environment and regulatory framework.

The SDR0805-391KL from Bourns Inc. qualifies as a substitute based on matching inductance (390 µH), identical core material (ferrite), identical shielding (unshielded), and compatible surface mount packaging. Both parts operate across -40°C to 125°C and maintain RoHS compliance. Differences in current rating, tolerance, and physical dimensions are documented in the parameter comparison table to enable informed selection based on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Selection between the LD2-391-R and SDR0805-391KL is determined by application-specific current requirements and tolerance specifications. The LD2-391-R supports a continuous current rating of 780 mA with a saturation current of 580 mA, making it suitable for higher-current applications. The SDR0805-391KL provides a lower continuous current rating of 360 mA with a saturation current of 550 mA, appropriate for moderate-current circuits.

Both parts maintain identical DC resistance (1.77 Ohm Max) and operate across the same temperature range (-40°C to 125°C). The SDR0805-391KL offers tighter inductance tolerance (±10% versus ±20%), which may be advantageous in precision circuit designs. Both parts are RoHS compliant and carry MSL 1 ratings, confirming suitability for standard manufacturing and storage environments.

Physical dimensions differ slightly: the LD2-391-R measures 7.80 mm × 7.00 mm × 5.00 mm (max height), while the SDR0805-391KL measures 7.80 mm × 7.80 mm × 5.30 mm (max height). PCB layout constraints and available board space should be evaluated when selecting between these alternatives.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-391KL directly replace the LD2-391-R in all applications?

A: Direct replacement is possible only when the application current requirement does not exceed 360 mA. The SDR0805-391KL has a lower continuous current rating (360 mA) compared to the LD2-391-R (780 mA). If the circuit draws current above 360 mA, the SDR0805-391KL will not operate within specification. Verify actual circuit current draw before substitution.

Q: What is the significance of the inductance tolerance difference?

A: The LD2-391-R carries ±20% tolerance while the SDR0805-391KL carries ±10% tolerance. Tighter tolerance (±10%) means the SDR0805-391KL inductance value will remain closer to the nominal 390 µH across the production range. Applications requiring precise inductance values benefit from the SDR0805-391KL. Applications with wider tolerance margins can use either part.

Q: Are there physical dimension constraints when substituting?

A: Yes. The SDR0805-391KL is slightly larger in width (7.80 mm versus 7.00 mm) and height (5.30 mm versus 5.00 mm). Verify that PCB layout and component placement allow for these dimensional differences before substitution. Tight board layouts may not accommodate the SDR0805-391KL.

Q: Do both parts meet the same regulatory compliance standards?

A: Both parts are RoHS compliant and carry MSL 1 (Unlimited) ratings. The LD2-391-R is RoHS Compliant; the SDR0805-391KL is ROHS3 Compliant. Both meet current regulatory requirements for lead-free and hazardous substance restrictions. Both are suitable for standard manufacturing environments without special moisture control.

Q: What is the saturation current difference, and why does it matter?

A: The LD2-391-R has a saturation current (Isat) of 580 mA; the SDR0805-391KL has 550 mA. Saturation current defines the point at which the inductor's inductance begins to degrade under high current stress. Applications with transient current spikes or high-current pulses should verify that peak currents remain below the saturation rating of the selected part.

Q: Can I use the LD2-391-R as a substitute for the SDR0805-391KL?

A: Yes, the LD2-391-R can substitute for the SDR0805-391KL in all applications where the SDR0805-391KL is specified, provided the PCB layout accommodates the slightly smaller dimensions of the LD2-391-R. The LD2-391-R offers higher current capacity (780 mA versus 360 mA) and wider tolerance (±20%), making it suitable for less stringent precision requirements.