Equivalent & Substitute Parts for LD1-3R3-R

Part Overview

The LD1-3R3-R is a 3.3 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 2 A continuous current with a maximum DC resistance of 58 mOhm and operates across the temperature range of -40°C to 125°C. The part is RoHS compliant and carries an active product status. Substitute components are identified when equivalent electrical and mechanical parameters align within the allowed specifications for this inductor category, enabling component selection flexibility for procurement, inventory management, or design optimization.

Substiute Parts

LD1-3R3-R

Eaton - Electronics DivisionIn Stock: 1220LD1-3R3-R Datasheet

Current PartRFQ

SDR0403-3R3ML

Bourns Inc.In Stock: 9086SDR0403-3R3ML Datasheet

DirectRFQ

B82462A4332M000

EPCOS - TDK ElectronicsIn Stock: 3561B82462A4332M000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LD1-3R3-R are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Inductance value: 3.3 µH (±20% tolerance band)
• Core type: Ferrite, unshielded drum core wirewound construction
• Mounting: Surface mount technology
• DC resistance: Maximum 58 mOhm or lower
• Current rating: Minimum 2 A continuous
• Operating temperature: Minimum -40°C to 125°C range coverage
• Moisture sensitivity: MSL 1 (Unlimited)
• RoHS compliance status: Active compliance required

Substitution Logic: Parts meeting all primary criteria are classified as direct substitutes. Parts with current ratings exceeding 2 A, lower DC resistance, or extended temperature ranges provide enhanced performance margins while maintaining functional equivalence. Dimensional variations within nonstandard package classifications are acceptable provided mounting type remains surface mount and physical footprint compatibility is verified.

Parameter Comparison

Engineering Selection Recommendations

SDR0403-3R3ML (Bourns Inc.): This part qualifies as a direct substitute with identical inductance, tolerance, and DC resistance specifications. The current rating of 2.15 A exceeds the minimum requirement, providing a 7.5% performance margin. Saturation current of 3 A offers improved headroom. Physical dimensions match the main part (4.50mm x 4.00mm), with a maximum seated height of 3.50 mm. Operating temperature range is identical. ROHS3 compliance and MSL 1 rating confirm environmental and handling compatibility. This substitute is suitable for direct replacement in applications where the identical footprint is required.

B82462A4332M000 (EPCOS - TDK Electronics): This part meets all primary substitution criteria with matching inductance, tolerance, and current rating. DC resistance of 60 mOhm is within acceptable tolerance (2 mOhm above specification). Saturation current of 3.2 A provides enhanced performance margin. The extended operating temperature range (-55°C to 150°C) exceeds the main part specification, offering broader environmental coverage. ROHS3 compliance and AEC-Q200 automotive qualification are provided. Physical dimensions differ (6.00mm x 6.00mm versus 4.50mm x 4.00mm), with a lower seated height of 3.00 mm. This substitute is suitable for applications where the larger footprint is accommodated and extended temperature performance is beneficial.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-3R3ML be used as a direct replacement for LD1-3R3-R?

A: Yes. Both parts share identical inductance (3.3 µH), tolerance (±20%), DC resistance (58 mOhm maximum), and physical footprint (4.50mm x 4.00mm). Operating temperature ranges are identical (-40°C to 125°C). The SDR0403-3R3ML provides a higher current rating (2.15 A versus 2 A) and improved saturation current (3 A versus 2.32 A), making it functionally equivalent with enhanced performance margins.

Q: What are the dimensional differences between the substitute parts?

A: The LD1-3R3-R and SDR0403-3R3ML share identical footprint dimensions of 4.50mm length by 4.00mm width, with maximum seated heights of 3.20 mm and 3.50 mm respectively. The B82462A4332M000 has a larger footprint of 6.00mm x 6.00mm with a lower seated height of 3.00 mm. PCB layout compatibility must be verified before selecting the B82462A4332M000 in space-constrained applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. The LD1-3R3-R is RoHS compliant. Both substitute parts carry ROHS3 compliance certification, confirming adherence to current RoHS directives. All three parts are MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What is the significance of the current rating difference between parts?

A: The LD1-3R3-R is rated for 2 A continuous current. The SDR0403-3R3ML is rated for 2.15 A, providing a 7.5% performance margin. The B82462A4332M000 matches the 2 A rating. Higher current ratings indicate greater thermal headroom and reduced risk of saturation under peak load conditions. Saturation current values (Isat) provide additional margin data: LD1-3R3-R at 2.32 A, SDR0403-3R3ML at 3 A, and B82462A4332M000 at 3.2 A.

Q: Can B82462A4332M000 be used in applications requiring the exact footprint of LD1-3R3-R?

A: No. The B82462A4332M000 has a larger footprint (6.00mm x 6.00mm) compared to the LD1-3R3-R (4.50mm x 4.00mm). This part is suitable only for applications where the larger footprint can be accommodated on the PCB. The extended operating temperature range (-55°C to 150°C) and AEC-Q200 qualification make it suitable for automotive and high-temperature applications.

Q: What does DC resistance (DCR) specification mean for inductor selection?

A: DC resistance represents the ohmic resistance of the inductor windings, measured in milliohms. Lower DCR reduces power dissipation and heat generation during operation. The LD1-3R3-R and SDR0403-3R3ML both specify 58 mOhm maximum, while the B82462A4332M000 specifies 60 mOhm maximum. All three values are within acceptable tolerance for this inductor category and do not significantly impact circuit performance in typical applications.

Q: Is AEC-Q200 qualification relevant for non-automotive applications?

A: AEC-Q200 is an automotive qualification standard indicating enhanced reliability testing and quality assurance. While the B82462A4332M000 carries this certification, it is not a requirement for non-automotive applications. The certification does confirm rigorous testing protocols and is beneficial for applications requiring high reliability standards, regardless of automotive use.